VRRP
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Installing a cluster on vSphere with customizations
- Prerequisites
- VMware vSphere infrastructure requirements
- Network connectivity requirements
- VMware vSphere CSI Driver Operator requirements
- vCenter requirements
- Generating a key pair for cluster node SSH access
- Obtaining the installation program
- Adding vCenter root CA certificates to your system trust
- VMware vSphere region and zone enablement
- Creating the installation configuration file
- Deploying the cluster
- Installing the OpenShift CLI by downloading the binary
- Logging in to the cluster by using the CLI
- Creating registry storage
- Backing up VMware vSphere volumes
- Services for an external load balancer
- Next steps
In OKD version 4.12, you can install a cluster on your
VMware vSphere instance by using installer-provisioned infrastructure. To customize the installation, you modify parameters in the install-config.yaml file before you install the cluster.
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OKD supports deploying a cluster to a single VMware vCenter only. Deploying a cluster with machines/machine sets on multiple vCenters is not supported. |
Prerequisites
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You reviewed details about the OKD installation and update processes.
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You read the documentation on selecting a cluster installation method and preparing it for users.
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You provisioned persistent storage for your cluster. To deploy a private image registry, your storage must provide
ReadWriteManyaccess modes. -
The OKD installer requires access to port 443 on the vCenter and ESXi hosts. You verified that port 443 is accessible.
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If you use a firewall, you confirmed with the administrator that port 443 is accessible. Control plane nodes must be able to reach vCenter and ESXi hosts on port 443 for the installation to succeed.
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If you use a firewall, you configured it to allow the sites that your cluster requires access to.
Be sure to also review this site list if you are configuring a proxy.
VMware vSphere infrastructure requirements
You must install an OKD cluster on one of the following versions of a VMware vSphere instance that meets the requirements for the components that you use:
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Version 7.0 Update 2 or later, or VMware Cloud Foundation 4.3 or later
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Version 8.0 Update 1 or later, or VMware Cloud Foundation 5.0 or later
You can host the VMware vSphere infrastructure on-premise or on a VMware Cloud Verified provider that meets the requirements outlined in the following table:
| Virtual environment product | Required version |
|---|---|
VMware virtual hardware |
15 or later |
vSphere ESXi hosts |
7.0 Update 2 or later, or VMware Cloud Foundation 4.3 or later; 8.0 Update 1 or later, or VMware Cloud Foundation 5.0 or later |
vCenter host |
7.0 Update 2 or later, or VMware Cloud Foundation 4.3 or later; 8.0 Update 1 or later, or VMware Cloud Foundation 5.0 or later |
|
Installing a cluster on VMware vSphere versions 7.0 and 7.0 Update 1 is deprecated. These versions are still fully supported, but all vSphere 6.x versions are no longer supported. Version 4.12 of OKD requires VMware virtual hardware version 15 or later. To update the hardware version for your vSphere virtual machines, see the "Updating hardware on nodes running in vSphere" article in the Updating clusters section. |
| Component | Minimum supported versions | Description |
|---|---|---|
Hypervisor |
vSphere 7.0 Update 2 or later, or VMware Cloud Foundation 4.3 or later; vSphere 8.0 Update 1 or later, or VMware Cloud Foundation 5.0 or later with virtual hardware version 15 |
This hypervisor version is the minimum version that Fedora CoreOS (FCOS) supports. For more information about supported hardware on the latest version of Fedora that is compatible with FCOS, see Hardware on the Red Hat Customer Portal. |
Storage with in-tree drivers |
vSphere 7.0 Update 2 or later; 8.0 Update 1 or later |
This plugin creates vSphere storage by using the in-tree storage drivers for vSphere included in OKD. |
Optional: Networking (NSX-T) |
vSphere 7.0 Update 2 or later, or VMware Cloud Foundation 4.3 or later; vSphere 8.0 Update 1 or later, or VMware Cloud Foundation 5.0 or later |
For more information about the compatibility of NSX and OKD, see the Release Notes section of VMware’s NSX container plugin documentation. |
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You must ensure that the time on your ESXi hosts is synchronized before you install OKD. See Edit Time Configuration for a Host in the VMware documentation. |
Network connectivity requirements
You must configure the network connectivity between machines to allow OKD cluster components to communicate.
Review the following details about the required network ports.
| Protocol | Port | Description |
|---|---|---|
N/A |
Required for keepalived |
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ICMP |
N/A |
Network reachability tests |
TCP |
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Metrics |
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Host level services, including the node exporter on ports |
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The default ports that Kubernetes reserves |
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openshift-sdn |
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UDP |
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virtual extensible LAN (VXLAN) |
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Geneve |
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Host level services, including the node exporter on ports |
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IPsec IKE packets |
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IPsec NAT-T packets |
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TCP/UDP |
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Kubernetes node port |
ESP |
N/A |
IPsec Encapsulating Security Payload (ESP) |
| Protocol | Port | Description |
|---|---|---|
TCP |
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Kubernetes API |
| Protocol | Port | Description |
|---|---|---|
TCP |
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etcd server and peer ports |
VMware vSphere CSI Driver Operator requirements
To install the vSphere CSI Driver Operator, the following requirements must be met:
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VMware vSphere version: 7.0 Update 2 or later, or VMware Cloud Foundation 4.3 or later; 8.0 Update 1 or later, or VMware Cloud Foundation 5.0 or later
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vCenter version: 7.0 Update 2 or later, or VMware Cloud Foundation 4.3 or later; 8.0 Update 1 or later, or VMware Cloud Foundation 5.0 or later
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Virtual machines of hardware version 15 or later
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No third-party vSphere CSI driver already installed in the cluster
If a third-party vSphere CSI driver is present in the cluster, OKD does not overwrite it. The presence of a third-party vSphere CSI driver prevents OKD from updating to OKD 4.13 or later.
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The VMware vSphere CSI Driver Operator is supported only on clusters deployed with |
Additional resources
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To remove a third-party vSphere CSI driver, see Removing a third-party vSphere CSI Driver.
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To update the hardware version for your vSphere nodes, see Updating hardware on nodes running in vSphere.
vCenter requirements
Before you install an OKD cluster on your vCenter that uses infrastructure that the installer provisions, you must prepare your environment.
Required vCenter account privileges
To install an OKD cluster in a vCenter, the installation program requires access to an account with privileges to read and create the required resources. Using an account that has global administrative privileges is the simplest way to access all of the necessary permissions.
If you cannot use an account with global administrative privileges, you must create roles to grant the privileges necessary for OKD cluster installation. While most of the privileges are always required, some are required only if you plan for the installation program to provision a folder to contain the OKD cluster on your vCenter instance, which is the default behavior. You must create or amend vSphere roles for the specified objects to grant the required privileges.
An additional role is required if the installation program is to create a vSphere virtual machine folder.
Roles and privileges required for installation in vSphere API
| vSphere object for role | When required | Required privileges in vSphere API |
|---|---|---|
vSphere vCenter |
Always |
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vSphere vCenter Cluster |
If VMs will be created in the cluster root |
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vSphere vCenter Resource Pool |
If an existing resource pool is provided |
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vSphere Datastore |
Always |
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vSphere Port Group |
Always |
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Virtual Machine Folder |
Always |
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vSphere vCenter Datacenter |
If the installation program creates the virtual machine folder. For UPI, |
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Roles and privileges required for installation in vCenter graphical user interface (GUI)
| vSphere object for role | When required | Required privileges in vCenter GUI |
|---|---|---|
vSphere vCenter |
Always |
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vSphere vCenter Cluster |
If VMs will be created in the cluster root |
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vSphere vCenter Resource Pool |
If an existing resource pool is provided |
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vSphere Datastore |
Always |
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vSphere Port Group |
Always |
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Virtual Machine Folder |
Always |
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vSphere vCenter Datacenter |
If the installation program creates the virtual machine folder. For UPI, |
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Additionally, the user requires some ReadOnly permissions, and some of the roles require permission to propogate the permissions to child objects. These settings vary depending on whether or not you install the cluster into an existing folder.
Required permissions and propagation settings
| vSphere object | When required | Propagate to children | Permissions required |
|---|---|---|---|
vSphere vCenter |
Always |
False |
Listed required privileges |
vSphere vCenter Datacenter |
Existing folder |
False |
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Installation program creates the folder |
True |
Listed required privileges |
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vSphere vCenter Cluster |
Existing resource pool |
False |
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VMs in cluster root |
True |
Listed required privileges |
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vSphere vCenter Datastore |
Always |
False |
Listed required privileges |
vSphere Switch |
Always |
False |
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vSphere Port Group |
Always |
False |
Listed required privileges |
vSphere vCenter Virtual Machine Folder |
Existing folder |
True |
Listed required privileges |
vSphere vCenter Resource Pool |
Existing resource pool |
True |
Listed required privileges |
For more information about creating an account with only the required privileges, see vSphere Permissions and User Management Tasks in the vSphere documentation.
Using OKD with vMotion
If you intend on using vMotion in your vSphere environment, consider the following before installing an OKD cluster.
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OKD generally supports compute-only vMotion, where generally implies that you meet all VMware best practices for vMotion.
To help ensure the uptime of your compute and control plane nodes, ensure that you follow the VMware best practices for vMotion, and use VMware anti-affinity rules to improve the availability of OKD during maintenance or hardware issues.
For more information about vMotion and anti-affinity rules, see the VMware vSphere documentation for vMotion networking requirements and VM anti-affinity rules.
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Using Storage vMotion can cause issues and is not supported. If you are using vSphere volumes in your pods, migrating a VM across datastores, either manually or through Storage vMotion, causes invalid references within OKD persistent volume (PV) objects that can result in data loss.
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OKD does not support selective migration of VMDKs across datastores, using datastore clusters for VM provisioning or for dynamic or static provisioning of PVs, or using a datastore that is part of a datastore cluster for dynamic or static provisioning of PVs.
Cluster resources
When you deploy an OKD cluster that uses installer-provisioned infrastructure, the installation program must be able to create several resources in your vCenter instance.
A standard OKD installation creates the following vCenter resources:
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1 Folder
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1 Tag category
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1 Tag
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Virtual machines:
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1 template
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1 temporary bootstrap node
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3 control plane nodes
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3 compute machines
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Although these resources use 856 GB of storage, the bootstrap node is destroyed during the cluster installation process. A minimum of 800 GB of storage is required to use a standard cluster.
If you deploy more compute machines, the OKD cluster will use more storage.
Cluster limits
Available resources vary between clusters. The number of possible clusters within a vCenter is limited primarily by available storage space and any limitations on the number of required resources. Be sure to consider both limitations to the vCenter resources that the cluster creates and the resources that you require to deploy a cluster, such as IP addresses and networks.
Networking requirements
You can use Dynamic Host Configuration Protocol (DHCP) for the network and configure the DHCP server to set persistent IP addresses to machines in your cluster. In the DHCP lease, you must configure the DHCP to use the default gateway.
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You do not need to use the DHCP for the network if you want to provision nodes with static IP addresses. |
If you are installing to a restricted environment, the VM in your restricted network must have access to vCenter so that it can provision and manage nodes, persistent volume claims (PVCs), and other resources.
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Ensure that each OKD node in the cluster has access to a Network Time Protocol (NTP) server that is discoverable by DHCP. Installation is possible without an NTP server. However, asynchronous server clocks can cause errors, which the NTP server prevents. |
Additionally, you must create the following networking resources before you install the OKD cluster:
Required IP Addresses
An installer-provisioned vSphere installation requires two static IP addresses:
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The API address is used to access the cluster API.
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The Ingress address is used for cluster ingress traffic.
You must provide these IP addresses to the installation program when you install the OKD cluster.
DNS records
You must create DNS records for two static IP addresses in the appropriate DNS server for the vCenter instance that hosts your OKD cluster. In each record, <cluster_name> is the cluster name and <base_domain> is the cluster base domain that you specify when you install the cluster. A complete DNS record takes the form: <component>.<cluster_name>.<base_domain>..
| Component | Record | Description |
|---|---|---|
API VIP |
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This DNS A/AAAA or CNAME record must point to the load balancer for the control plane machines. This record must be resolvable by both clients external to the cluster and from all the nodes within the cluster. |
Ingress VIP |
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A wildcard DNS A/AAAA or CNAME record that points to the load balancer that targets the machines that run the Ingress router pods, which are the worker nodes by default. This record must be resolvable by both clients external to the cluster and from all the nodes within the cluster. |
Generating a key pair for cluster node SSH access
During an OKD installation, you can provide an SSH public key to the installation program. The key is passed to the Fedora CoreOS (FCOS) nodes through their Ignition config files and is used to authenticate SSH access to the nodes. The key is added to the ~/.ssh/authorized_keys list for the core user on each node, which enables password-less authentication.
After the key is passed to the nodes, you can use the key pair to SSH in to the FCOS nodes as the user core. To access the nodes through SSH, the private key identity must be managed by SSH for your local user.
If you want to SSH in to your cluster nodes to perform installation debugging or disaster recovery, you must provide the SSH public key during the installation process. The ./openshift-install gather command also requires the SSH public key to be in place on the cluster nodes.
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Do not skip this procedure in production environments, where disaster recovery and debugging is required. |
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You must use a local key, not one that you configured with platform-specific approaches such as AWS key pairs. |
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On clusters running Fedora CoreOS (FCOS), the SSH keys specified in the Ignition config files are written to the |
Procedure
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If you do not have an existing SSH key pair on your local machine to use for authentication onto your cluster nodes, create one. For example, on a computer that uses a Linux operating system, run the following command:
$ ssh-keygen -t ed25519 -N '' -f <path>/<file_name> (1)1 Specify the path and file name, such as ~/.ssh/id_ed25519, of the new SSH key. If you have an existing key pair, ensure your public key is in the your~/.sshdirectory.If you plan to install an OKD cluster that uses FIPS validated or Modules In Process cryptographic libraries on the
x86_64,ppc64le, ands390xarchitectures. do not create a key that uses theed25519algorithm. Instead, create a key that uses thersaorecdsaalgorithm. -
View the public SSH key:
$ cat <path>/<file_name>.pubFor example, run the following to view the
~/.ssh/id_ed25519.pubpublic key:$ cat ~/.ssh/id_ed25519.pub -
Add the SSH private key identity to the SSH agent for your local user, if it has not already been added. SSH agent management of the key is required for password-less SSH authentication onto your cluster nodes, or if you want to use the
./openshift-install gathercommand.On some distributions, default SSH private key identities such as
~/.ssh/id_rsaand~/.ssh/id_dsaare managed automatically.-
If the
ssh-agentprocess is not already running for your local user, start it as a background task:$ eval "$(ssh-agent -s)"Example outputAgent pid 31874If your cluster is in FIPS mode, only use FIPS-compliant algorithms to generate the SSH key. The key must be either RSA or ECDSA.
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Add your SSH private key to the
ssh-agent:$ ssh-add <path>/<file_name> (1)1 Specify the path and file name for your SSH private key, such as ~/.ssh/id_ed25519Example outputIdentity added: /home/<you>/<path>/<file_name> (<computer_name>)
Next steps
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When you install OKD, provide the SSH public key to the installation program.
Obtaining the installation program
Before you install OKD, download the installation file on the host you are using for installation.
Prerequisites
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You have a machine that runs Linux, for example Red Hat Enterprise Linux 8, with 500 MB of local disk space.
If you attempt to run the installation program on macOS, a known issue related to the
golangcompiler causes the installation of the OKD cluster to fail. For more information about this issue, see the section named "Known Issues" in the OKD 4.12 release notes document.
Procedure
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Download installer from https://github.com/openshift/okd/releases
The installation program creates several files on the computer that you use to install your cluster. You must keep the installation program and the files that the installation program creates after you finish installing the cluster. Both files are required to delete the cluster.
Deleting the files created by the installation program does not remove your cluster, even if the cluster failed during installation. To remove your cluster, complete the OKD uninstallation procedures for your specific cloud provider.
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Extract the installation program. For example, on a computer that uses a Linux operating system, run the following command:
$ tar -xvf openshift-install-linux.tar.gz -
Download your installation pull secret from the Red Hat OpenShift Cluster Manager. This pull secret allows you to authenticate with the services that are provided by the included authorities, including Quay.io, which serves the container images for OKD components.
Using a pull secret from the Red Hat OpenShift Cluster Manager is not required. You can use a pull secret for another private registry. Or, if you do not need the cluster to pull images from a private registry, you can use
{"auths":{"fake":{"auth":"aWQ6cGFzcwo="}}}as the pull secret when prompted during the installation.If you do not use the pull secret from the Red Hat OpenShift Cluster Manager:
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Red Hat Operators are not available.
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The Telemetry and Insights operators do not send data to Red Hat.
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Content from the Red Hat Container Catalog registry, such as image streams and Operators, are not available.
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Adding vCenter root CA certificates to your system trust
Because the installation program requires access to your vCenter’s API, you must add your vCenter’s trusted root CA certificates to your system trust before you install an OKD cluster.
Procedure
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From the vCenter home page, download the vCenter’s root CA certificates. Click Download trusted root CA certificates in the vSphere Web Services SDK section. The
<vCenter>/certs/download.zipfile downloads. -
Extract the compressed file that contains the vCenter root CA certificates. The contents of the compressed file resemble the following file structure:
certs ├── lin │ ├── 108f4d17.0 │ ├── 108f4d17.r1 │ ├── 7e757f6a.0 │ ├── 8e4f8471.0 │ └── 8e4f8471.r0 ├── mac │ ├── 108f4d17.0 │ ├── 108f4d17.r1 │ ├── 7e757f6a.0 │ ├── 8e4f8471.0 │ └── 8e4f8471.r0 └── win ├── 108f4d17.0.crt ├── 108f4d17.r1.crl ├── 7e757f6a.0.crt ├── 8e4f8471.0.crt └── 8e4f8471.r0.crl 3 directories, 15 files -
Add the files for your operating system to the system trust. For example, on a Fedora operating system, run the following command:
# cp certs/lin/* /etc/pki/ca-trust/source/anchors -
Update your system trust. For example, on a Fedora operating system, run the following command:
# update-ca-trust extract
VMware vSphere region and zone enablement
You can deploy an OKD cluster to multiple vSphere datacenters that run in a single VMware vCenter. Each datacenter can run multiple clusters. This configuration reduces the risk of a hardware failure or network outage that can cause your cluster to fail. To enable regions and zones, you must define multiple failure domains for your OKD cluster.
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VMware vSphere region and zone enablement is a Technology Preview feature only. Technology Preview features are not supported with Red Hat production service level agreements (SLAs) and might not be functionally complete. Red Hat does not recommend using them in production. These features provide early access to upcoming product features, enabling customers to test functionality and provide feedback during the development process. For more information about the support scope of Red Hat Technology Preview features, see Technology Preview Features Support Scope. |
The default installation configuration deploys a cluster to a single vSphere datacenter. If you want to deploy a cluster to multiple vSphere datacenters, you must create an installation configuration file that enables the region and zone feature.
The default install-config.yaml file includes vcenters and failureDomains fields, where you can specify multiple vSphere datacenters and clusters for your OKD cluster. You can leave these fields blank if you want to install an OKD cluster in a vSphere environment that consists of single datacenter.
The following list describes terms associated with defining zones and regions for your cluster:
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Failure domain: Establishes the relationships between a region and zone. You define a failure domain by using vCenter objects, such as a
datastoreobject. A failure domain defines the vCenter location for OKD cluster nodes. -
Region: Specifies a vCenter datacenter. You define a region by using a tag from the
openshift-regiontag category. -
Zone: Specifies a vCenter cluster. You define a zone by using a tag from the
openshift-zonetag category.
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If you plan on specifying more than one failure domain in your |
You must create a vCenter tag for each vCenter datacenter, which represents a region. Additionally, you must create a vCenter tag for each cluster than runs in a datacenter, which represents a zone. After you create the tags, you must attach each tag to their respective datacenters and clusters.
The following table outlines an example of the relationship among regions, zones, and tags for a configuration with multiple vSphere datacenters running in a single VMware vCenter.
| Datacenter (region) | Cluster (zone) | Tags |
|---|---|---|
us-east |
us-east-1 |
us-east-1a |
us-east-1b |
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us-east-2 |
us-east-2a |
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us-east-2b |
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us-west |
us-west-1 |
us-west-1a |
us-west-1b |
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us-west-2 |
us-west-2a |
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us-west-2b |
Creating the installation configuration file
You can customize the OKD cluster you install on VMware vSphere.
Prerequisites
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Obtain the OKD installation program and the pull secret for your cluster.
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Obtain service principal permissions at the subscription level.
Procedure
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Create the
install-config.yamlfile.-
Change to the directory that contains the installation program and run the following command:
$ ./openshift-install create install-config --dir <installation_directory> (1)1 For <installation_directory>, specify the directory name to store the files that the installation program creates.When specifying the directory:
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Verify that the directory has the
executepermission. This permission is required to run Terraform binaries under the installation directory. -
Use an empty directory. Some installation assets, such as bootstrap X.509 certificates, have short expiration intervals, therefore you must not reuse an installation directory. If you want to reuse individual files from another cluster installation, you can copy them into your directory. However, the file names for the installation assets might change between releases. Use caution when copying installation files from an earlier OKD version.
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At the prompts, provide the configuration details for your cloud:
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Optional: Select an SSH key to use to access your cluster machines.
For production OKD clusters on which you want to perform installation debugging or disaster recovery, specify an SSH key that your
ssh-agentprocess uses. -
Select vsphere as the platform to target.
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Specify the name of your vCenter instance.
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Specify the user name and password for the vCenter account that has the required permissions to create the cluster.
The installation program connects to your vCenter instance.
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Select the data center in your vCenter instance to connect to.
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Select the default vCenter datastore to use.
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Select the vCenter cluster to install the OKD cluster in. The installation program uses the root resource pool of the vSphere cluster as the default resource pool.
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Select the network in the vCenter instance that contains the virtual IP addresses and DNS records that you configured.
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Enter the virtual IP address that you configured for control plane API access.
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Enter the virtual IP address that you configured for cluster ingress.
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Enter the base domain. This base domain must be the same one that you used in the DNS records that you configured.
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Enter a descriptive name for your cluster. The cluster name you enter must match the cluster name you specified when configuring the DNS records.
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Paste the pull secret from the Red Hat OpenShift Cluster Manager. This field is optional.
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-
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Modify the
install-config.yamlfile. You can find more information about the available parameters in the "Installation configuration parameters" section. -
Back up the
install-config.yamlfile so that you can use it to install multiple clusters.The
install-config.yamlfile is consumed during the installation process. If you want to reuse the file, you must back it up now.
Installation configuration parameters
Before you deploy an OKD cluster, you provide parameter values to describe your account on the cloud platform that hosts your cluster and optionally customize your cluster’s platform. When you create the install-config.yaml installation configuration file, you provide values for the required parameters through the command line. If you customize your cluster, you can modify the install-config.yaml file to provide more details about the platform.
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After installation, you cannot modify these parameters in the |
Required configuration parameters
Required installation configuration parameters are described in the following table:
| Parameter | Description | Values |
|---|---|---|
|
The API version for the |
String |
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The base domain of your cloud provider. The base domain is used to create routes to your OKD cluster components. The full DNS name for your cluster is a combination of the |
A fully-qualified domain or subdomain name, such as |
|
Kubernetes resource |
Object |
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The name of the cluster. DNS records for the cluster are all subdomains of |
String of lowercase letters and hyphens ( |
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The configuration for the specific platform upon which to perform the installation: |
Object |
Network configuration parameters
You can customize your installation configuration based on the requirements of your existing network infrastructure. For example, you can expand the IP address block for the cluster network or provide different IP address blocks than the defaults.
Only IPv4 addresses are supported.
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Globalnet is not supported with Red Hat OpenShift Data Foundation disaster recovery solutions. For regional disaster recovery scenarios, ensure that you use a nonoverlapping range of private IP addresses for the cluster and service networks in each cluster. |
| Parameter | Description | Values | ||
|---|---|---|---|---|
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The configuration for the cluster network. |
Object
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The Red Hat OpenShift Networking network plugin to install. |
Either |
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The IP address blocks for pods. The default value is If you specify multiple IP address blocks, the blocks must not overlap. |
An array of objects. For example: |
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Required if you use An IPv4 network. |
An IP address block in Classless Inter-Domain Routing (CIDR) notation.
The prefix length for an IPv4 block is between |
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The subnet prefix length to assign to each individual node. For example, if |
A subnet prefix. The default value is |
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The IP address block for services. The default value is The OpenShift SDN and OVN-Kubernetes network plugins support only a single IP address block for the service network. |
An array with an IP address block in CIDR format. For example: |
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The IP address blocks for machines. If you specify multiple IP address blocks, the blocks must not overlap. |
An array of objects. For example: |
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Required if you use |
An IP network block in CIDR notation. For example,
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Optional configuration parameters
Optional installation configuration parameters are described in the following table:
| Parameter | Description | Values | ||||
|---|---|---|---|---|---|---|
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A PEM-encoded X.509 certificate bundle that is added to the nodes' trusted certificate store. This trust bundle may also be used when a proxy has been configured. |
String |
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Controls the installation of optional core cluster components. You can reduce the footprint of your OKD cluster by disabling optional components. For more information, see the "Cluster capabilities" page in Installing. |
String array |
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Selects an initial set of optional capabilities to enable. Valid values are |
String |
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Extends the set of optional capabilities beyond what you specify in |
String array |
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The configuration for the machines that comprise the compute nodes. |
Array of |
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Determines the instruction set architecture of the machines in the pool. Currently, clusters with varied architectures are not supported. All pools must specify the same architecture. Valid values are |
String |
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Required if you use |
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Required if you use |
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The number of compute machines, which are also known as worker machines, to provision. |
A positive integer greater than or equal to |
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Enables the cluster for a feature set. A feature set is a collection of OKD features that are not enabled by default. For more information about enabling a feature set during installation, see "Enabling features using feature gates". |
String. The name of the feature set to enable, such as |
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The configuration for the machines that comprise the control plane. |
Array of |
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Determines the instruction set architecture of the machines in the pool. Currently, clusters with varied architectures are not supported. All pools must specify the same architecture. Valid values are |
String |
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Required if you use |
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Required if you use |
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|
The number of control plane machines to provision. |
The only supported value is |
||||
|
The Cloud Credential Operator (CCO) mode. If no mode is specified, the CCO dynamically tries to determine the capabilities of the provided credentials, with a preference for mint mode on the platforms where multiple modes are supported.
|
|
||||
|
Sources and repositories for the release-image content. |
Array of objects. Includes a |
||||
|
Required if you use |
String |
||||
|
Specify one or more repositories that may also contain the same images. |
Array of strings |
||||
|
How to publish or expose the user-facing endpoints of your cluster, such as the Kubernetes API, OpenShift routes. |
Setting this field to
|
||||
|
The SSH key to authenticate access to your cluster machines.
|
For example, |
Additional VMware vSphere configuration parameters
Additional VMware vSphere configuration parameters are described in the following table.
|
The |
| Parameter | Description | Values | ||
|---|---|---|---|---|
|
The fully-qualified hostname or IP address of the vCenter server. |
String |
||
|
The user name to use to connect to the vCenter instance with. This user must have at least the roles and privileges that are required for static or dynamic persistent volume provisioning in vSphere. |
String |
||
|
The password for the vCenter user name. |
String |
||
|
The name of the data center to use in the vCenter instance. |
String |
||
|
The name of the default datastore to use for provisioning volumes. |
String |
||
|
Optional. The absolute path of an existing folder where the installation program creates the virtual machines. If you do not provide this value, the installation program creates a folder that is named with the infrastructure ID in the data center virtual machine folder. |
String, for example, |
||
|
Optional. The absolute path of an existing resource pool where the installation program creates the virtual machines. If you do not specify a value, the installation program installs the resources in the root of the cluster under |
String, for example, |
||
|
The network in the vCenter instance that contains the virtual IP addresses and DNS records that you configured. |
String |
||
|
The vCenter cluster to install the OKD cluster in. |
String |
||
|
The virtual IP (VIP) address that you configured for control plane API access.
|
An IP address, for example |
||
|
The virtual IP (VIP) address that you configured for cluster ingress.
|
An IP address, for example |
||
|
Optional. The disk provisioning method. This value defaults to the vSphere default storage policy if not set. |
Valid values are |
Optional VMware vSphere machine pool configuration parameters
Optional VMware vSphere machine pool configuration parameters are described in the following table.
|
The |
| Parameter | Description | Values |
|---|---|---|
|
The location from which the installation program downloads the FCOS image. You must set this parameter to perform an installation in a restricted network. |
An HTTP or HTTPS URL, optionally with a SHA-256 checksum. For example, |
|
The size of the disk in gigabytes. |
Integer |
|
The total number of virtual processor cores to assign a virtual machine. The value of |
Integer |
|
The number of cores per socket in a virtual machine. The number of virtual sockets on the virtual machine is |
Integer |
|
The size of a virtual machine’s memory in megabytes. |
Integer |
Region and zone enablement configuration parameters
To use the region and zone enablement feature, you must specify region and zone enablement parameters in your installation file.
|
Before you modify the |
|
The |
| Parameter | Description | Values |
|---|---|---|
|
Establishes the relationships between a region and zone. You define a failure domain by using vCenter objects, such as a |
String |
|
The name of the failure domain. The machine pools use this name to reference the failure domain. |
String |
|
Specifies the fully-qualified hostname or IP address of the VMware vCenter server, so that a client can access failure domain resources. You must apply the server role to the vSphere vCenter server location. |
String |
|
You define a region by using a tag from the |
String |
|
You define a zone by using a tag from the |
String |
|
This parameter defines the compute cluster associated with the failure domain. If you do not define this parameter in your configuration, the compute cluster takes the value of |
String |
|
The absolute path of an existing folder where the installation program creates the virtual machines. If you do not define this parameter in your configuration, the folder takes the value of |
String |
|
Defines the datacenter where OKD virtual machines (VMs) operate. If you do not define this parameter in your configuration, the datacenter defaults to |
String |
|
Specifies the path to a vSphere datastore that stores virtual machines files for a failure domain. You must apply the datastore role to the vSphere vCenter datastore location. |
String |
|
Lists any network in the vCenter instance that contains the virtual IP addresses and DNS records that you configured. If you do not define this parameter in your configuration, the network takes the value of |
String |
|
Optional: The absolute path of an existing resource pool where the installation program creates the virtual machines, for example, |
String |
Sample install-config.yaml file for an installer-provisioned VMware vSphere cluster
You can customize the install-config.yaml file to specify more details about
your OKD cluster’s platform or modify the values of the required
parameters.
apiVersion: v1
baseDomain: example.com (1)
compute: (2)
name: worker
replicas: 3
platform:
vsphere: (3)
cpus: 2
coresPerSocket: 2
memoryMB: 8192
osDisk:
diskSizeGB: 120
controlPlane: (2)
name: master
replicas: 3
platform:
vsphere: (3)
cpus: 4
coresPerSocket: 2
memoryMB: 16384
osDisk:
diskSizeGB: 120
metadata:
name: cluster (4)
platform:
vsphere:
vcenter: your.vcenter.server
username: username
password: password
datacenter: datacenter
defaultDatastore: datastore
folder: folder
resourcePool: resource_pool (5)
diskType: thin (6)
network: VM_Network
cluster: vsphere_cluster_name (7)
apiVIPs:
- api_vip
ingressVIPs:
- ingress_vip
pullSecret: '{"auths": ...}'
sshKey: 'ssh-ed25519 AAAA...'| 1 | The base domain of the cluster. All DNS records must be sub-domains of this base and include the cluster name. |
| 2 | The controlPlane section is a single mapping, but the compute section is a sequence of mappings. To meet the requirements of the different data structures, the first line of the compute section must begin with a hyphen, -, and the first line of the controlPlane section must not. Only one control plane pool is used. |
| 3 | Optional: Provide additional configuration for the machine pool parameters for the compute and control plane machines. |
| 4 | The cluster name that you specified in your DNS records. |
| 5 | Optional: Provide an existing resource pool for machine creation. If you do not specify a value, the installation program uses the root resource pool of the vSphere cluster. |
| 6 | The vSphere disk provisioning method. |
| 7 | The vSphere cluster to install the OKD cluster in. |
|
In OKD 4.12 and later, the |
Configuring the cluster-wide proxy during installation
Production environments can deny direct access to the internet and instead have
an HTTP or HTTPS proxy available. You can configure a new OKD
cluster to use a proxy by configuring the proxy settings in the
install-config.yaml file.
Prerequisites
-
You have an existing
install-config.yamlfile. -
You reviewed the sites that your cluster requires access to and determined whether any of them need to bypass the proxy. By default, all cluster egress traffic is proxied, including calls to hosting cloud provider APIs. You added sites to the
Proxyobject’sspec.noProxyfield to bypass the proxy if necessary.The
Proxyobjectstatus.noProxyfield is populated with the values of thenetworking.machineNetwork[].cidr,networking.clusterNetwork[].cidr, andnetworking.serviceNetwork[]fields from your installation configuration.For installations on Amazon Web Services (AWS), Google Cloud Platform (GCP), Microsoft Azure, and OpenStack, the
Proxyobjectstatus.noProxyfield is also populated with the instance metadata endpoint (169.254.169.254).
Procedure
-
Edit your
install-config.yamlfile and add the proxy settings. For example:apiVersion: v1 baseDomain: my.domain.com proxy: httpProxy: http://<username>:<pswd>@<ip>:<port> (1) httpsProxy: https://<username>:<pswd>@<ip>:<port> (2) noProxy: example.com (3) additionalTrustBundle: | (4) -----BEGIN CERTIFICATE----- <MY_TRUSTED_CA_CERT> -----END CERTIFICATE----- additionalTrustBundlePolicy: <policy_to_add_additionalTrustBundle> (5)1 A proxy URL to use for creating HTTP connections outside the cluster. The URL scheme must be http.2 A proxy URL to use for creating HTTPS connections outside the cluster. 3 A comma-separated list of destination domain names, IP addresses, or other network CIDRs to exclude from proxying. Preface a domain with .to match subdomains only. For example,.y.commatchesx.y.com, but noty.com. Use*to bypass the proxy for all destinations. You must include vCenter’s IP address and the IP range that you use for its machines.4 If provided, the installation program generates a config map that is named user-ca-bundlein theopenshift-confignamespace that contains one or more additional CA certificates that are required for proxying HTTPS connections. The Cluster Network Operator then creates atrusted-ca-bundleconfig map that merges these contents with the Fedora CoreOS (FCOS) trust bundle, and this config map is referenced in thetrustedCAfield of theProxyobject. TheadditionalTrustBundlefield is required unless the proxy’s identity certificate is signed by an authority from the FCOS trust bundle.5 Optional: The policy to determine the configuration of the Proxyobject to reference theuser-ca-bundleconfig map in thetrustedCAfield. The allowed values areProxyonlyandAlways. UseProxyonlyto reference theuser-ca-bundleconfig map only whenhttp/httpsproxy is configured. UseAlwaysto always reference theuser-ca-bundleconfig map. The default value isProxyonly.The installation program does not support the proxy
readinessEndpointsfield.If the installer times out, restart and then complete the deployment by using the
wait-forcommand of the installer. For example:$ ./openshift-install wait-for install-complete --log-level debug -
Save the file and reference it when installing OKD.
The installation program creates a cluster-wide proxy that is named cluster that uses the proxy
settings in the provided install-config.yaml file. If no proxy settings are
provided, a cluster Proxy object is still created, but it will have a nil
spec.
|
Only the |
Configuring regions and zones for a VMware vCenter
You can modify the default installation configuration file to deploy an OKD cluster to multiple vSphere datacenters that run in a single VMware vCenter.
|
VMware vSphere region and zone enablement is a Technology Preview feature only. Technology Preview features are not supported with Red Hat production service level agreements (SLAs) and might not be functionally complete. Red Hat does not recommend using them in production. These features provide early access to upcoming product features, enabling customers to test functionality and provide feedback during the development process. For more information about the support scope of Red Hat Technology Preview features, see Technology Preview Features Support Scope. |
|
The example uses the |
Prerequisites
-
You have an existing
install-config.yamlinstallation configuration file.You must specify at least one failure domain for your OKD cluster, so that you can provision datacenter objects for your VMware vCenter server. Consider specifying multiple failure domains if you need to provision virtual machine nodes in different datacenters, clusters, datastores, and other components. To enable regions and zones, you must define multiple failure domains for your OKD cluster.
You cannot change a failure domain after you installed an OKD cluster on the VMware vSphere platform. You can add additional failure domains after cluster installation.
Procedure
-
Enter the following
govccommand-line tool commands to create theopenshift-regionandopenshift-zonevCenter tag categories:If you specify different names for the
openshift-regionandopenshift-zonevCenter tag categories, the installation of the OKD cluster fails.$ govc tags.category.create -d "OpenShift region" openshift-region$ govc tags.category.create -d "OpenShift zone" openshift-zone -
To create a region tag for each region vSphere datacenter where you want to deploy your cluster, enter the following command in your terminal:
$ govc tags.create -c <region_tag_category> <region_tag> -
To create a zone tag for each vSphere cluster where you want to deploy your cluster, enter the following command:
$ govc tags.create -c <zone_tag_category> <zone_tag> -
Attach region tags to each vCenter datacenter object by entering the following command:
$ govc tags.attach -c <region_tag_category> <region_tag_1> /<datacenter_1> -
Attach the zone tags to each vCenter datacenter object by entering the following command:
$ govc tags.attach -c <zone_tag_category> <zone_tag_1> /<datacenter_1>/host/vcs-mdcnc-workload-1 -
Change to the directory that contains the installation program and initialize the cluster deployment according to your chosen installation requirements.
Sample
install-config.yaml file with multiple datacenters defined in a vSphere centerapiVersion: v1
baseDomain: example.com
featureSet: TechPreviewNoUpgrade (1)
compute:
name: worker
replicas: 3
vsphere:
zones: (2)
- "<machine_pool_zone_1>"
- "<machine_pool_zone_2>"
controlPlane:
name: master
replicas: 3
vsphere:
zones: (2)
- "<machine_pool_zone_1>"
- "<machine_pool_zone_2>"
metadata:
name: cluster
platform:
vsphere:
vcenter: <vcenter_server> (3)
username: <username> (3)
password: <password> (3)
datacenter: datacenter (3)
defaultDatastore: datastore (3)
folder: "/<datacenter_name>/vm/<folder_name>/<subfolder_name>" (3)
cluster: cluster (3)
resourcePool: "/<datacenter_name>/host/<cluster_name>/Resources/<resource_pool_name>" (3)
diskType: thin
failureDomains: (4)
- name: <machine_pool_zone_1> (5)
region: <region_tag_1> (6)
zone: <zone_tag_1> (7)
topology: (8)
datacenter: <datacenter1> (9)
computeCluster: "/<datacenter1>/host/<cluster1>" (10)
resourcePool: "/<datacenter1>/host/<cluster1>/Resources/<resourcePool1>" (11)
networks: (12)
- <VM_Network1_name>
datastore: "/<datacenter1>/datastore/<datastore1>" (13)
- name: <machine_pool_zone_2>
region: <region_tag_2>
zone: <zone_tag_2>
topology:
datacenter: <datacenter2>
computeCluster: "/<datacenter2>/host/<cluster2>"
networks:
- <VM_Network2_name>
datastore: "/<datacenter2>/datastore/<datastore2>"
resourcePool: "/<datacenter2>/host/<cluster2>/Resources/<resourcePool2>"
folder: "/<datacenter2>/vm/<folder2>"
# ...| 1 | You must define set the TechPreviewNoUpgrade as the value for this parameter, so that you can use the VMware vSphere region and zone enablement feature. |
| 2 | An optional parameter for specifying a vCenter cluster. You define a zone by using a tag from the openshift-zone tag category. If you do not define this parameter, nodes will be distributed among all defined failure-domains. |
| 3 | The default vCenter topology. The installation program uses this topology information to deploy the bootstrap node. Additionally, the topology defines the default datastore for vSphere persistent volumes. |
| 4 | Establishes the relationships between a region and zone. You define a failure domain by using vCenter objects, such as a datastore object. A failure domain defines the vCenter location for OKD cluster nodes. If you do not define this parameter, the installation program uses the default vCenter topology. |
| 5 | Defines the name of the failure domain. Each failure domain is referenced in the zones parameter to scope a machine pool to the failure domain. |
| 6 | You define a region by using a tag from the openshift-region tag category. The tag must be attached to the vCenter datacenter. |
| 7 | You define a zone by using a tag from the openshift-zone tag category. The tag must be attached to the vCenter datacenter. |
| 8 | Specifies the vCenter resources associated with the failure domain. |
| 9 | An optional parameter for defining the vSphere datacenter that is associated with a failure domain. If you do not define this parameter, the installation program uses the default vCenter topology. |
| 10 | An optional parameter for stating the absolute file path for the compute cluster that is associated with the failure domain. If you do not define this parameter, the installation program uses the default vCenter topology. |
| 11 | An optional parameter for the installer-provisioned infrastructure. The parameter sets the absolute path of an existing resource pool where the installation program creates the virtual machines, for example, /<datacenter_name>/host/<cluster_name>/Resources/<resource_pool_name>/<optional_nested_resource_pool_name>. If you do not specify a value, resources are installed in the root of the cluster /example_datacenter/host/example_cluster/Resources. |
| 12 | An optional parameter that lists any network in the vCenter instance that contains the virtual IP addresses and DNS records that you configured. If you do not define this parameter, the installation program uses the default vCenter topology. |
| 13 | An optional parameter for specifying a datastore to use for provisioning volumes. If you do not define this parameter, the installation program uses the default vCenter topology. |
Deploying the cluster
You can install OKD on a compatible cloud platform.
|
You can run the |
Prerequisites
-
Obtain the OKD installation program and the pull secret for your cluster.
-
Verify the cloud provider account on your host has the correct permissions to deploy the cluster. An account with incorrect permissions causes the installation process to fail with an error message that displays the missing permissions.
Procedure
-
Change to the directory that contains the installation program and initialize the cluster deployment:
$ ./openshift-install create cluster --dir <installation_directory> \ (1) --log-level=info (2)1 For <installation_directory>, specify the location of your customized./install-config.yamlfile.2 To view different installation details, specify warn,debug, orerrorinstead ofinfo.If the cloud provider account that you configured on your host does not have sufficient permissions to deploy the cluster, the installation process stops, and the missing permissions are displayed.
Verification
When the cluster deployment completes successfully:
-
The terminal displays directions for accessing your cluster, including a link to the web console and credentials for the
kubeadminuser. -
Credential information also outputs to
<installation_directory>/.openshift_install.log.
|
Do not delete the installation program or the files that the installation program creates. Both are required to delete the cluster. |
Example output
...
INFO Install complete!
INFO To access the cluster as the system:admin user when using 'oc', run 'export KUBECONFIG=/home/myuser/install_dir/auth/kubeconfig'
INFO Access the OpenShift web-console here: https://console-openshift-console.apps.mycluster.example.com
INFO Login to the console with user: "kubeadmin", and password: "password"
INFO Time elapsed: 36m22s
|
Installing the OpenShift CLI by downloading the binary
You can install the OpenShift CLI (oc) to interact with OKD from a
command-line interface. You can install oc on Linux, Windows, or macOS.
|
If you installed an earlier version of |
Installing the OpenShift CLI on Linux
You can install the OpenShift CLI (oc) binary on Linux by using the following procedure.
Procedure
-
Navigate to https://mirror.openshift.com/pub/openshift-v4/clients/oc/latest/ and choose the folder for your operating system and architecture.
-
Download
oc.tar.gz. -
Unpack the archive:
$ tar xvf <file> -
Place the
ocbinary in a directory that is on yourPATH.To check your
PATH, execute the following command:$ echo $PATH
Verification
-
After you install the OpenShift CLI, it is available using the
occommand:$ oc <command>
Installing the OpenShift CLI on Windows
You can install the OpenShift CLI (oc) binary on Windows by using the following procedure.
Procedure
-
Navigate to https://mirror.openshift.com/pub/openshift-v4/clients/oc/latest/ and choose the folder for your operating system and architecture.
-
Download
oc.zip. -
Unzip the archive with a ZIP program.
-
Move the
ocbinary to a directory that is on yourPATH.To check your
PATH, open the command prompt and execute the following command:C:\> path
Verification
-
After you install the OpenShift CLI, it is available using the
occommand:C:\> oc <command>
Installing the OpenShift CLI on macOS
You can install the OpenShift CLI (oc) binary on macOS by using the following procedure.
Procedure
-
Navigate to https://mirror.openshift.com/pub/openshift-v4/clients/oc/latest/ and choose the folder for your operating system and architecture.
-
Download
oc.tar.gz. -
Unpack and unzip the archive.
-
Move the
ocbinary to a directory on your PATH.To check your
PATH, open a terminal and execute the following command:$ echo $PATH
Verification
-
After you install the OpenShift CLI, it is available using the
occommand:$ oc <command>
Logging in to the cluster by using the CLI
You can log in to your cluster as a default system user by exporting the cluster kubeconfig file.
The kubeconfig file contains information about the cluster that is used by the CLI to connect a client to the correct cluster and API server.
The file is specific to a cluster and is created during OKD installation.
Prerequisites
-
You deployed an OKD cluster.
-
You installed the
ocCLI.
Procedure
-
Export the
kubeadmincredentials:$ export KUBECONFIG=<installation_directory>/auth/kubeconfig (1)1 For <installation_directory>, specify the path to the directory that you stored the installation files in. -
Verify you can run
occommands successfully using the exported configuration:$ oc whoamiExample outputsystem:admin
Creating registry storage
After you install the cluster, you must create storage for the registry Operator.
Image registry removed during installation
On platforms that do not provide shareable object storage, the OpenShift Image Registry Operator bootstraps itself as Removed. This allows openshift-installer to complete installations on these platform types.
After installation, you must edit the Image Registry Operator configuration to switch the managementState from Removed to Managed. When this has completed, you must configure storage.
Image registry storage configuration
The Image Registry Operator is not initially available for platforms that do not provide default storage. After installation, you must configure your registry to use storage so that the Registry Operator is made available.
Instructions are shown for configuring a persistent volume, which is required for production clusters. Where applicable, instructions are shown for configuring an empty directory as the storage location, which is available for only non-production clusters.
Additional instructions are provided for allowing the image registry to use block storage types by using the Recreate rollout strategy during upgrades.
Configuring registry storage for VMware vSphere
As a cluster administrator, following installation you must configure your registry to use storage.
Prerequisites
-
Cluster administrator permissions.
-
A cluster on VMware vSphere.
-
Persistent storage provisioned for your cluster, such as Red Hat OpenShift Data Foundation.
OKD supports
ReadWriteOnceaccess for image registry storage when you have only one replica.ReadWriteOnceaccess also requires that the registry uses theRecreaterollout strategy. To deploy an image registry that supports high availability with two or more replicas,ReadWriteManyaccess is required. -
Must have "100Gi" capacity.
|
Testing shows issues with using the NFS server on RHEL as storage backend for core services. This includes the OpenShift Container Registry and Quay, Prometheus for monitoring storage, and Elasticsearch for logging storage. Therefore, using RHEL NFS to back PVs used by core services is not recommended. Other NFS implementations on the marketplace might not have these issues. Contact the individual NFS implementation vendor for more information on any testing that was possibly completed against these OKD core components. |
Procedure
-
To configure your registry to use storage, change the
spec.storage.pvcin theconfigs.imageregistry/clusterresource.When you use shared storage, review your security settings to prevent outside access.
-
Verify that you do not have a registry pod:
$ oc get pod -n openshift-image-registry -l docker-registry=defaultExample outputNo resourses found in openshift-image-registry namespaceIf you do have a registry pod in your output, you do not need to continue with this procedure.
-
Check the registry configuration:
$ oc edit configs.imageregistry.operator.openshift.ioExample outputstorage: pvc: claim: (1)1 Leave the claimfield blank to allow the automatic creation of animage-registry-storagepersistent volume claim (PVC). The PVC is generated based on the default storage class. However, be aware that the default storage class might provide ReadWriteOnce (RWO) volumes, such as a RADOS Block Device (RBD), which can cause issues when you replicate to more than one replica. -
Check the
clusteroperatorstatus:$ oc get clusteroperator image-registryExample outputNAME VERSION AVAILABLE PROGRESSING DEGRADED SINCE MESSAGE image-registry 4.7 True False False 6h50m
Configuring block registry storage for VMware vSphere
To allow the image registry to use block storage types such as vSphere Virtual Machine Disk (VMDK) during upgrades as a cluster administrator, you can use the Recreate rollout strategy.
|
Block storage volumes are supported but not recommended for use with image registry on production clusters. An installation where the registry is configured on block storage is not highly available because the registry cannot have more than one replica. |
Procedure
-
Enter the following command to set the image registry storage as a block storage type, patch the registry so that it uses the
Recreaterollout strategy, and runs with only1replica:$ oc patch config.imageregistry.operator.openshift.io/cluster --type=merge -p '{"spec":{"rolloutStrategy":"Recreate","replicas":1}}' -
Provision the PV for the block storage device, and create a PVC for that volume. The requested block volume uses the ReadWriteOnce (RWO) access mode.
-
Create a
pvc.yamlfile with the following contents to define a VMware vSpherePersistentVolumeClaimobject:kind: PersistentVolumeClaim apiVersion: v1 metadata: name: image-registry-storage (1) namespace: openshift-image-registry (2) spec: accessModes: - ReadWriteOnce (3) resources: requests: storage: 100Gi (4)1 A unique name that represents the PersistentVolumeClaimobject.2 The namespace for the PersistentVolumeClaimobject, which isopenshift-image-registry.3 The access mode of the persistent volume claim. With ReadWriteOnce, the volume can be mounted with read and write permissions by a single node.4 The size of the persistent volume claim. -
Enter the following command to create the
PersistentVolumeClaimobject from the file:$ oc create -f pvc.yaml -n openshift-image-registry
-
-
Enter the following command to edit the registry configuration so that it references the correct PVC:
$ oc edit config.imageregistry.operator.openshift.io -o yamlExample outputstorage: pvc: claim: (1)1 By creating a custom PVC, you can leave the claimfield blank for the default automatic creation of animage-registry-storagePVC.
For instructions about configuring registry storage so that it references the correct PVC, see Configuring the registry for vSphere.
Backing up VMware vSphere volumes
OKD provisions new volumes as independent persistent disks to freely attach and detach the volume on any node in the cluster. As a consequence, it is not possible to back up volumes that use snapshots, or to restore volumes from snapshots. See Snapshot Limitations for more information.
Procedure
To create a backup of persistent volumes:
-
Stop the application that is using the persistent volume.
-
Clone the persistent volume.
-
Restart the application.
-
Create a backup of the cloned volume.
-
Delete the cloned volume.
Additional resources
-
See About remote health monitoring for more information about the Telemetry service
Services for an external load balancer
You can configure an OKD cluster to use an external load balancer in place of the default load balancer.
|
Configuring an external load balancer depends on your vendor’s load balancer. The information and examples in this section are for guideline purposes only. Consult the vendor documentation for more specific information about the vendor’s load balancer. |
Red Hat supports the following services for an external load balancer:
-
Ingress Controller
-
OpenShift API
-
OpenShift MachineConfig API
You can choose whether you want to configure one or all of these services for an external load balancer. Configuring only the Ingress Controller service is a common configuration option. To better understand each service, view the following diagrams:
Figure 1. Example network workflow that shows an Ingress Controller operating in an OKD environment
Figure 2. Example network workflow that shows an OpenShift API operating in an OKD environment
Figure 3. Example network workflow that shows an OpenShift MachineConfig API operating in an OKD environment
The following configuration options are supported for external load balancers:
-
Use a node selector to map the Ingress Controller to a specific set of nodes. You must assign a static IP address to each node in this set, or configure each node to receive the same IP address from the Dynamic Host Configuration Protocol (DHCP). Infrastructure nodes commonly receive this type of configuration.
-
Target all IP addresses on a subnet. This configuration can reduce maintenance overhead, because you can create and destroy nodes within those networks without reconfiguring the load balancer targets. If you deploy your ingress pods by using a machine set on a smaller network, such as a
/27or/28, you can simplify your load balancer targets.You can list all IP addresses that exist in a network by checking the machine config pool’s resources.
Before you configure an external load balancer for your OKD cluster, consider the following information:
-
For a front-end IP address, you can use the same IP address for the front-end IP address, the Ingress Controller’s load balancer, and API load balancer. Check the vendor’s documentation for this capability.
-
For a back-end IP address, ensure that an IP address for an OKD control plane node does not change during the lifetime of the external load balancer. You can achieve this by completing one of the following actions:
-
Assign a static IP address to each control plane node.
-
Configure each node to receive the same IP address from the DHCP every time the node requests a DHCP lease. Depending on the vendor, the DHCP lease might be in the form of an IP reservation or a static DHCP assignment.
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Manually define each node that runs the Ingress Controller in the external load balancer for the Ingress Controller back-end service. For example, if the Ingress Controller moves to an undefined node, a connection outage can occur.
Configuring an external load balancer
You can configure an OKD cluster to use an external load balancer in place of the default load balancer.
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Before you configure an external load balancer, ensure that you read the "Services for an external load balancer" section. |
Read the following prerequisites that apply to the service that you want to configure for your external load balancer.
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MetalLB, that runs on a cluster, functions as an external load balancer. |
OpenShift API prerequisites
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You defined a front-end IP address.
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TCP ports 6443 and 22623 are exposed on the front-end IP address of your load balancer. Check the following items:
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Port 6443 provides access to the OpenShift API service.
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Port 22623 can provide ignition startup configurations to nodes.
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The front-end IP address and port 6443 are reachable by all users of your system with a location external to your OKD cluster.
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The front-end IP address and port 22623 are reachable only by OKD nodes.
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The load balancer backend can communicate with OKD control plane nodes on port 6443 and 22623.
Ingress Controller prerequisites
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You defined a front-end IP address.
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TCP ports 443 and 80 are exposed on the front-end IP address of your load balancer.
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The front-end IP address, port 80 and port 443 are be reachable by all users of your system with a location external to your OKD cluster.
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The front-end IP address, port 80 and port 443 are reachable to all nodes that operate in your OKD cluster.
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The load balancer backend can communicate with OKD nodes that run the Ingress Controller on ports 80, 443, and 1936.
Prerequisite for health check URL specifications
You can configure most load balancers by setting health check URLs that determine if a service is available or unavailable. OKD provides these health checks for the OpenShift API, Machine Configuration API, and Ingress Controller backend services.
The following examples demonstrate health check specifications for the previously listed backend services:
Example of a Kubernetes API health check specification
Path: HTTPS:6443/readyz
Healthy threshold: 2
Unhealthy threshold: 2
Timeout: 10
Interval: 10Example of a Machine Config API health check specification
Path: HTTPS:22623/healthz
Healthy threshold: 2
Unhealthy threshold: 2
Timeout: 10
Interval: 10Example of an Ingress Controller health check specification
Path: HTTP:1936/healthz/ready
Healthy threshold: 2
Unhealthy threshold: 2
Timeout: 5
Interval: 10Procedure
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Configure the HAProxy Ingress Controller, so that you can enable access to the cluster from your load balancer on ports 6443, 443, and 80:
Example HAProxy configuration#... listen my-cluster-api-6443 bind 192.168.1.100:6443 mode tcp balance roundrobin option httpchk http-check connect http-check send meth GET uri /readyz http-check expect status 200 server my-cluster-master-2 192.168.1.101:6443 check inter 10s rise 2 fall 2 server my-cluster-master-0 192.168.1.102:6443 check inter 10s rise 2 fall 2 server my-cluster-master-1 192.168.1.103:6443 check inter 10s rise 2 fall 2 listen my-cluster-machine-config-api-22623 bind 192.168.1.100:22623 mode tcp balance roundrobin option httpchk http-check connect http-check send meth GET uri /healthz http-check expect status 200 server my-cluster-master-2 192.168.1.101:22623 check inter 10s rise 2 fall 2 server my-cluster-master-0 192.168.1.102:22623 check inter 10s rise 2 fall 2 server my-cluster-master-1 192.168.1.103:22623 check inter 10s rise 2 fall 2 listen my-cluster-apps-443 bind 192.168.1.100:443 mode tcp balance roundrobin option httpchk http-check connect http-check send meth GET uri /healthz/ready http-check expect status 200 server my-cluster-worker-0 192.168.1.111:443 check port 1936 inter 10s rise 2 fall 2 server my-cluster-worker-1 192.168.1.112:443 check port 1936 inter 10s rise 2 fall 2 server my-cluster-worker-2 192.168.1.113:443 check port 1936 inter 10s rise 2 fall 2 listen my-cluster-apps-80 bind 192.168.1.100:80 mode tcp balance roundrobin option httpchk http-check connect http-check send meth GET uri /healthz/ready http-check expect status 200 server my-cluster-worker-0 192.168.1.111:80 check port 1936 inter 10s rise 2 fall 2 server my-cluster-worker-1 192.168.1.112:80 check port 1936 inter 10s rise 2 fall 2 server my-cluster-worker-2 192.168.1.113:80 check port 1936 inter 10s rise 2 fall 2 # ... -
Use the
curlCLI command to verify that the external load balancer and its resources are operational:-
Verify that the cluster machine configuration API is accessible to the Kubernetes API server resource, by running the following command and observing the response:
$ curl https://<loadbalancer_ip_address>:6443/version --insecureIf the configuration is correct, you receive a JSON object in response:
{ "major": "1", "minor": "11+", "gitVersion": "v1.11.0+ad103ed", "gitCommit": "ad103ed", "gitTreeState": "clean", "buildDate": "2019-01-09T06:44:10Z", "goVersion": "go1.10.3", "compiler": "gc", "platform": "linux/amd64" } -
Verify that the cluster machine configuration API is accessible to the Machine config server resource, by running the following command and observing the output:
$ curl -v https://<loadbalancer_ip_address>:22623/healthz --insecureIf the configuration is correct, the output from the command shows the following response:
HTTP/1.1 200 OK Content-Length: 0 -
Verify that the controller is accessible to the Ingress Controller resource on port 80, by running the following command and observing the output:
$ curl -I -L -H "Host: console-openshift-console.apps.<cluster_name>.<base_domain>" http://<load_balancer_front_end_IP_address>If the configuration is correct, the output from the command shows the following response:
HTTP/1.1 302 Found content-length: 0 location: https://console-openshift-console.apps.ocp4.private.opequon.net/ cache-control: no-cache -
Verify that the controller is accessible to the Ingress Controller resource on port 443, by running the following command and observing the output:
$ curl -I -L --insecure --resolve console-openshift-console.apps.<cluster_name>.<base_domain>:443:<Load Balancer Front End IP Address> https://console-openshift-console.apps.<cluster_name>.<base_domain>If the configuration is correct, the output from the command shows the following response:
HTTP/1.1 200 OK referrer-policy: strict-origin-when-cross-origin set-cookie: csrf-token=UlYWOyQ62LWjw2h003xtYSKlh1a0Py2hhctw0WmV2YEdhJjFyQwWcGBsja261dGLgaYO0nxzVErhiXt6QepA7g==; Path=/; Secure; SameSite=Lax x-content-type-options: nosniff x-dns-prefetch-control: off x-frame-options: DENY x-xss-protection: 1; mode=block date: Wed, 04 Oct 2023 16:29:38 GMT content-type: text/html; charset=utf-8 set-cookie: 1e2670d92730b515ce3a1bb65da45062=1bf5e9573c9a2760c964ed1659cc1673; path=/; HttpOnly; Secure; SameSite=None cache-control: private
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Configure the DNS records for your cluster to target the front-end IP addresses of the external load balancer. You must update records to your DNS server for the cluster API and applications over the load balancer.
Examples of modified DNS records<load_balancer_ip_address> A api.<cluster_name>.<base_domain> A record pointing to Load Balancer Front End<load_balancer_ip_address> A apps.<cluster_name>.<base_domain> A record pointing to Load Balancer Front EndDNS propagation might take some time for each DNS record to become available. Ensure that each DNS record propagates before validating each record.
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Use the
curlCLI command to verify that the external load balancer and DNS record configuration are operational:-
Verify that you can access the cluster API, by running the following command and observing the output:
$ curl https://api.<cluster_name>.<base_domain>:6443/version --insecureIf the configuration is correct, you receive a JSON object in response:
{ "major": "1", "minor": "11+", "gitVersion": "v1.11.0+ad103ed", "gitCommit": "ad103ed", "gitTreeState": "clean", "buildDate": "2019-01-09T06:44:10Z", "goVersion": "go1.10.3", "compiler": "gc", "platform": "linux/amd64" } -
Verify that you can access the cluster machine configuration, by running the following command and observing the output:
$ curl -v https://api.<cluster_name>.<base_domain>:22623/healthz --insecureIf the configuration is correct, the output from the command shows the following response:
HTTP/1.1 200 OK Content-Length: 0 -
Verify that you can access each cluster application on port, by running the following command and observing the output:
$ curl http://console-openshift-console.apps.<cluster_name>.<base_domain -I -L --insecureIf the configuration is correct, the output from the command shows the following response:
HTTP/1.1 302 Found content-length: 0 location: https://console-openshift-console.apps.<cluster-name>.<base domain>/ cache-control: no-cacheHTTP/1.1 200 OK referrer-policy: strict-origin-when-cross-origin set-cookie: csrf-token=39HoZgztDnzjJkq/JuLJMeoKNXlfiVv2YgZc09c3TBOBU4NI6kDXaJH1LdicNhN1UsQWzon4Dor9GWGfopaTEQ==; Path=/; Secure x-content-type-options: nosniff x-dns-prefetch-control: off x-frame-options: DENY x-xss-protection: 1; mode=block date: Tue, 17 Nov 2020 08:42:10 GMT content-type: text/html; charset=utf-8 set-cookie: 1e2670d92730b515ce3a1bb65da45062=9b714eb87e93cf34853e87a92d6894be; path=/; HttpOnly; Secure; SameSite=None cache-control: private -
Verify that you can access each cluster application on port 443, by running the following command and observing the output:
$ curl https://console-openshift-console.apps.<cluster_name>.<base_domain> -I -L --insecureIf the configuration is correct, the output from the command shows the following response:
HTTP/1.1 200 OK referrer-policy: strict-origin-when-cross-origin set-cookie: csrf-token=UlYWOyQ62LWjw2h003xtYSKlh1a0Py2hhctw0WmV2YEdhJjFyQwWcGBsja261dGLgaYO0nxzVErhiXt6QepA7g==; Path=/; Secure; SameSite=Lax x-content-type-options: nosniff x-dns-prefetch-control: off x-frame-options: DENY x-xss-protection: 1; mode=block date: Wed, 04 Oct 2023 16:29:38 GMT content-type: text/html; charset=utf-8 set-cookie: 1e2670d92730b515ce3a1bb65da45062=1bf5e9573c9a2760c964ed1659cc1673; path=/; HttpOnly; Secure; SameSite=None cache-control: private
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Next steps
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If necessary, you can opt out of remote health reporting.
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Optional: View the events from the vSphere Problem Detector Operator to determine if the cluster has permission or storage configuration issues.