$ ssh-keygen -t ed25519 -N '' -f <path>/<file_name> (1)
In OKD version 4.17, you can install a private cluster into an existing VPC. The installation program provisions the rest of the required infrastructure, which you can further customize. To customize the installation, you modify parameters in the install-config.yaml
file before you install the cluster.
You reviewed details about the OKD installation and update processes.
You read the documentation on selecting a cluster installation method and preparing it for users.
You configured an IBM Cloud® account to host the cluster.
If you use a firewall, you configured it to allow the sites that your cluster requires access to.
You configured the ccoctl
utility before you installed the cluster. For more information, see Configuring IAM for IBM Cloud®.
You can deploy a private OKD cluster that does not expose external endpoints. Private clusters are accessible from only an internal network and are not visible to the internet.
By default, OKD is provisioned to use publicly-accessible DNS and endpoints. A private cluster sets the DNS, Ingress Controller, and API server to private when you deploy your cluster. This means that the cluster resources are only accessible from your internal network and are not visible to the internet.
If the cluster has any public subnets, load balancer services created by administrators might be publicly accessible. To ensure cluster security, verify that these services are explicitly annotated as private. |
To deploy a private cluster, you must:
Use existing networking that meets your requirements. Your cluster resources might be shared between other clusters on the network.
Create a DNS zone using IBM Cloud® DNS Services and specify it as the base domain of the cluster. For more information, see "Using IBM Cloud® DNS Services to configure DNS resolution".
Deploy from a machine that has access to:
The API services for the cloud to which you provision.
The hosts on the network that you provision.
The internet to obtain installation media.
You can use any machine that meets these access requirements and follows your company’s guidelines. For example, this machine can be a bastion host on your cloud network or a machine that has access to the network through a VPN.
To create a private cluster on IBM Cloud®, you must provide an existing private VPC and subnets to host the cluster. The installation program must also be able to resolve the DNS records that the cluster requires. The installation program configures the Ingress Operator and API server for only internal traffic.
The cluster still requires access to internet to access the IBM Cloud® APIs.
The following items are not required or created when you install a private cluster:
Public subnets
Public network load balancers, which support public ingress
A public DNS zone that matches the baseDomain
for the cluster
The installation program does use the baseDomain
that you specify to create a private DNS zone and the required records for the cluster. The cluster is configured so that the Operators do not create public records for the cluster and all cluster machines are placed in the private subnets that you specify.
In OKD 4.17, you can deploy a cluster into the subnets of an existing IBM® Virtual Private Cloud (VPC). Deploying OKD into an existing VPC can help you avoid limit constraints in new accounts or more easily abide by the operational constraints that your company’s guidelines set. If you cannot obtain the infrastructure creation permissions that are required to create the VPC yourself, use this installation option.
Because the installation program cannot know what other components are in your existing subnets, it cannot choose subnet CIDRs and so forth. You must configure networking for the subnets to which you will install the cluster.
You must correctly configure the existing VPC and its subnets before you install the cluster. The installation program does not create the following components:
NAT gateways
Subnets
Route tables
VPC network
The installation program cannot:
Subdivide network ranges for the cluster to use
Set route tables for the subnets
Set VPC options like DHCP
The installation program requires that you use the cloud-provided DNS server. Using a custom DNS server is not supported and causes the installation to fail. |
The VPC and all of the subnets must be in an existing resource group. The cluster is deployed to the existing VPC.
As part of the installation, specify the following in the install-config.yaml
file:
The name of the existing resource group that contains the VPC and subnets (networkResourceGroupName
)
The name of the existing VPC (vpcName
)
The subnets that were created for control plane machines and compute machines (controlPlaneSubnets
and computeSubnets
)
Additional installer-provisioned cluster resources are deployed to a separate resource group ( |
To ensure that the subnets that you provide are suitable, the installation program confirms the following:
All of the subnets that you specify exist.
For each availability zone in the region, you specify:
One subnet for control plane machines.
One subnet for compute machines.
The machine CIDR that you specified contains the subnets for the compute machines and control plane machines.
Subnet IDs are not supported. |
If you deploy OKD to an existing network, the isolation of cluster services is reduced in the following ways:
You can install multiple OKD clusters in the same VPC.
ICMP ingress is allowed to the entire network.
TCP port 22 ingress (SSH) is allowed to the entire network.
Control plane TCP 6443 ingress (Kubernetes API) is allowed to the entire network.
Control plane TCP 22623 ingress (MCS) is allowed to the entire network.
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.
Do not skip this procedure in production environments, where disaster recovery and debugging is required. |
You must use a local key, not one that you configured with platform-specific approaches such as AWS key pairs. |
On clusters running Fedora CoreOS (FCOS), the SSH keys specified in the Ignition config files are written to the |
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 ~/.ssh directory. |
If you plan to install an OKD cluster that uses the Fedora cryptographic libraries that have been submitted to NIST for FIPS 140-2/140-3 Validation on only the |
View the public SSH key:
$ cat <path>/<file_name>.pub
For example, run the following to view the ~/.ssh/id_ed25519.pub
public 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 gather
command.
On some distributions, default SSH private key identities such as |
If the ssh-agent
process is not already running for your local user, start it as a background task:
$ eval "$(ssh-agent -s)"
Agent pid 31874
If your cluster is in FIPS mode, only use FIPS-compliant algorithms to generate the SSH key. The key must be either RSA or ECDSA. |
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_ed25519 |
Identity added: /home/<you>/<path>/<file_name> (<computer_name>)
When you install OKD, provide the SSH public key to the installation program.
Before you install OKD, download the installation file on a bastion host on your cloud network or a machine that has access to the to the network through a VPN.
For more information about private cluster installation requirements, see "Private clusters".
You have a machine that runs Linux, for example Red Hat Enterprise Linux 8, with 500 MB of local disk space.
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. |
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 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 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 Red Hat OpenShift Cluster Manager:
Red Hat Operators are not available.
The Telemetry and Insights operators do not send data to Red Hat.
Content from the Red Hat Container Catalog registry, such as image streams and Operators, are not available.
You must set the API key you created as a global variable; the installation program ingests the variable during startup to set the API key.
You have created either a user API key or service ID API key for your IBM Cloud® account.
Export your API key for your account as a global variable:
$ export IC_API_KEY=<api_key>
You must set the variable name exactly as specified; the installation program expects the variable name to be present during startup. |
Installing the cluster requires that you manually create the installation configuration file.
You have an SSH public key on your local machine to provide to the installation program. The key will be used for SSH authentication onto your cluster nodes for debugging and disaster recovery.
You have obtained the OKD installation program and the pull secret for your cluster.
Create an installation directory to store your required installation assets in:
$ mkdir <installation_directory>
You must create a directory. Some installation assets, like bootstrap X.509 certificates have short expiration intervals, so 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. |
Customize the sample install-config.yaml
file template that is provided and save
it in the <installation_directory>
.
You must name this configuration file |
Back up the install-config.yaml
file so that you can use it to install multiple clusters.
The |
Each cluster machine must meet the following minimum requirements:
Machine | Operating System | vCPU | Virtual RAM | Storage | Input/Output Per Second (IOPS) |
---|---|---|---|---|---|
Bootstrap |
FCOS |
4 |
16 GB |
100 GB |
300 |
Control plane |
FCOS |
4 |
16 GB |
100 GB |
300 |
Compute |
FCOS |
2 |
8 GB |
100 GB |
300 |
As of OKD version 4.13, RHCOS is based on RHEL version 9.2, which updates the micro-architecture requirements. The following list contains the minimum instruction set architectures (ISA) that each architecture requires:
For more information, see RHEL Architectures. |
If an instance type for your platform meets the minimum requirements for cluster machines, it is supported to use in OKD.
The following IBM Cloud® instance types have been tested with OKD.
bx2-8x32
bx2d-4x16
bx3d-4x20
bx3dc-8x40
cx2-8x16
cx2d-4x8
cx3d-8x20
cx3dc-4x10
gx2-8x64x1v100
gx3-16x80x1l4
mx2-8x64
mx2d-4x32
mx3d-4x40
ox2-8x64
ux2d-2x56
vx2d-4x56
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.
This sample YAML file is provided for reference only. You must obtain your |
apiVersion: v1
baseDomain: example.com (1)
controlPlane: (2) (3)
hyperthreading: Enabled (4)
name: master
platform:
ibmcloud: {}
replicas: 3
compute: (2) (3)
- hyperthreading: Enabled (4)
name: worker
platform:
ibmcloud: {}
replicas: 3
metadata:
name: test-cluster (1)
networking:
clusterNetwork:
- cidr: 10.128.0.0/14 (5)
hostPrefix: 23
machineNetwork:
- cidr: 10.0.0.0/16 (6)
networkType: OVNKubernetes (7)
serviceNetwork:
- 172.30.0.0/16
platform:
ibmcloud:
region: eu-gb (1)
resourceGroupName: eu-gb-example-cluster-rg (8)
networkResourceGroupName: eu-gb-example-existing-network-rg (9)
vpcName: eu-gb-example-network-1 (10)
controlPlaneSubnets: (11)
- eu-gb-example-network-1-cp-eu-gb-1
- eu-gb-example-network-1-cp-eu-gb-2
- eu-gb-example-network-1-cp-eu-gb-3
computeSubnets: (12)
- eu-gb-example-network-1-compute-eu-gb-1
- eu-gb-example-network-1-compute-eu-gb-2
- eu-gb-example-network-1-compute-eu-gb-3
credentialsMode: Manual
publish: Internal (13)
pullSecret: '{"auths": ...}' (1)
sshKey: ssh-ed25519 AAAA... (14)
1 | Required. | ||
2 | If you do not provide these parameters and values, the installation program provides the default value. | ||
3 | 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. |
||
4 | Enables or disables simultaneous multithreading, also known as Hyper-Threading. By default, simultaneous multithreading is enabled to increase the performance of your machines' cores. You can disable it by setting the parameter value to Disabled . If you disable simultaneous multithreading in some cluster machines, you must disable it in all cluster machines.
|
||
5 | The machine CIDR must contain the subnets for the compute machines and control plane machines. | ||
6 | The CIDR must contain the subnets defined in platform.ibmcloud.controlPlaneSubnets and platform.ibmcloud.computeSubnets . |
||
7 | The cluster network plugin to install. The default value OVNKubernetes is the only supported value. |
||
8 | The name of an existing resource group. All installer-provisioned cluster resources are deployed to this resource group. If undefined, a new resource group is created for the cluster. | ||
9 | Specify the name of the resource group that contains the existing virtual private cloud (VPC). The existing VPC and subnets should be in this resource group. The cluster will be installed to this VPC. | ||
10 | Specify the name of an existing VPC. | ||
11 | Specify the name of the existing subnets to which to deploy the control plane machines. The subnets must belong to the VPC that you specified. Specify a subnet for each availability zone in the region. | ||
12 | Specify the name of the existing subnets to which to deploy the compute machines. The subnets must belong to the VPC that you specified. Specify a subnet for each availability zone in the region. | ||
13 | How to publish the user-facing endpoints of your cluster. Set publish to Internal to deploy a private cluster. The default value is External . |
||
14 | You can optionally provide the sshKey value that you use to access the machines in your cluster.
|
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.
You have an existing install-config.yaml
file.
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 Proxy
object’s spec.noProxy
field to bypass the proxy if necessary.
The For installations on Amazon Web Services (AWS), Google Cloud Platform (GCP), Microsoft Azure, and OpenStack, the |
Edit your install-config.yaml
file 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.com matches x.y.com , but not y.com . Use * to bypass the proxy for all destinations. |
4 | If provided, the installation program generates a config map that is named user-ca-bundle in
the openshift-config namespace that contains one or more additional CA
certificates that are required for proxying HTTPS connections. The Cluster Network
Operator then creates a trusted-ca-bundle config map that merges these contents
with the Fedora CoreOS (FCOS) trust bundle, and this config map is referenced in the trustedCA field of the Proxy object. The additionalTrustBundle field 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 Proxy object to reference the user-ca-bundle config map in the trustedCA field. The allowed values are Proxyonly and Always . Use Proxyonly to reference the user-ca-bundle config map only when http/https proxy is configured. Use Always to always reference the user-ca-bundle config map. The default value is Proxyonly . |
The installation program does not support the proxy |
If the installer times out, restart and then complete the deployment by using the
|
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 |
Installing the cluster requires that the Cloud Credential Operator (CCO) operate in manual mode. While the installation program configures the CCO for manual mode, you must specify the identity and access management secrets for you cloud provider.
You can use the Cloud Credential Operator (CCO) utility (ccoctl
) to create the required IBM Cloud® resources.
You have configured the ccoctl
binary.
You have an existing install-config.yaml
file.
Edit the install-config.yaml
configuration file so that it contains the credentialsMode
parameter set to Manual
.
install-config.yaml
configuration fileapiVersion: v1
baseDomain: cluster1.example.com
credentialsMode: Manual (1)
compute:
- architecture: amd64
hyperthreading: Enabled
1 | This line is added to set the credentialsMode parameter to Manual . |
To generate the manifests, run the following command from the directory that contains the installation program:
$ ./openshift-install create manifests --dir <installation_directory>
From the directory that contains the installation program, set a $RELEASE_IMAGE
variable with the release image from your installation file by running the following command:
$ RELEASE_IMAGE=$(./openshift-install version | awk '/release image/ {print $3}')
Extract the list of CredentialsRequest
custom resources (CRs) from the OKD release image by running the following command:
$ oc adm release extract \
--from=$RELEASE_IMAGE \
--credentials-requests \
--included \(1)
--install-config=<path_to_directory_with_installation_configuration>/install-config.yaml \(2)
--to=<path_to_directory_for_credentials_requests> (3)
1 | The --included parameter includes only the manifests that your specific cluster configuration requires. |
2 | Specify the location of the install-config.yaml file. |
3 | Specify the path to the directory where you want to store the CredentialsRequest objects. If the specified directory does not exist, this command creates it. |
This command creates a YAML file for each CredentialsRequest
object.
CredentialsRequest
object apiVersion: cloudcredential.openshift.io/v1
kind: CredentialsRequest
metadata:
labels:
controller-tools.k8s.io: "1.0"
name: openshift-image-registry-ibmcos
namespace: openshift-cloud-credential-operator
spec:
secretRef:
name: installer-cloud-credentials
namespace: openshift-image-registry
providerSpec:
apiVersion: cloudcredential.openshift.io/v1
kind: IBMCloudProviderSpec
policies:
- attributes:
- name: serviceName
value: cloud-object-storage
roles:
- crn:v1:bluemix:public:iam::::role:Viewer
- crn:v1:bluemix:public:iam::::role:Operator
- crn:v1:bluemix:public:iam::::role:Editor
- crn:v1:bluemix:public:iam::::serviceRole:Reader
- crn:v1:bluemix:public:iam::::serviceRole:Writer
- attributes:
- name: resourceType
value: resource-group
roles:
- crn:v1:bluemix:public:iam::::role:Viewer
Create the service ID for each credential request, assign the policies defined, create an API key, and generate the secret:
$ ccoctl ibmcloud create-service-id \
--credentials-requests-dir=<path_to_credential_requests_directory> \(1)
--name=<cluster_name> \(2)
--output-dir=<installation_directory> \(3)
--resource-group-name=<resource_group_name> (4)
1 | Specify the directory containing the files for the component CredentialsRequest objects. |
2 | Specify the name of the OKD cluster. |
3 | Optional: Specify the directory in which you want the ccoctl utility to create objects. By default, the utility creates objects in the directory in which the commands are run. |
4 | Optional: Specify the name of the resource group used for scoping the access policies. |
If your cluster uses Technology Preview features that are enabled by the If an incorrect resource group name is provided, the installation fails during the bootstrap phase. To find the correct resource group name, run the following command:
|
Ensure that the appropriate secrets were generated in your cluster’s manifests
directory.
You can install OKD on a compatible cloud platform.
You can run the |
You have configured an account with the cloud platform that hosts your cluster.
You have the OKD installation program and the pull secret for your cluster.
You have verified that 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.
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.yaml file. |
2 | To view different installation details, specify warn , debug , or
error instead of info . |
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 kubeadmin
user.
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. |
...
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
|
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 |
You can install the OpenShift CLI (oc
) binary on Linux by using the following 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 oc
binary in a directory that is on your PATH
.
To check your PATH
, execute the following command:
$ echo $PATH
After you install the OpenShift CLI, it is available using the oc
command:
$ oc <command>
You can install the OpenShift CLI (oc
) binary on Windows by using the following 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 oc
binary to a directory that is on your PATH
.
To check your PATH
, open the command prompt and execute the following command:
C:\> path
After you install the OpenShift CLI, it is available using the oc
command:
C:\> oc <command>
You can install the OpenShift CLI (oc
) binary on macOS by using the following 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 oc
binary to a directory on your PATH.
To check your PATH
, open a terminal and execute the following command:
$ echo $PATH
Verify your installation by using an oc
command:
$ oc <command>
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.
You deployed an OKD cluster.
You installed the oc
CLI.
Export the kubeadmin
credentials:
$ 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 oc
commands successfully using the exported configuration:
$ oc whoami
system:admin
If necessary, you can opt out of remote health reporting.