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Using the cluster-compare plugin

Using the cluster-compare plugin with a live cluster

You can use the cluster-compare plugin to compare a reference configuration with configuration custom resources (CRs) from a live cluster.

Validate live cluster configurations to ensure compliance with reference configurations during design, development, or testing scenarios.

Use the cluster-compare plugin with live clusters in non-production environments only. For production environments, use the plugin with must-gather data.
Prerequisites

  • You installed the OpenShift CLI (oc).

  • You have access to the cluster as a user with the cluster-admin role.

  • You downloaded the cluster-compare plugin and include it in your PATH environment variable.

  • You have access to a reference configuration.

Procedure

  • Run the cluster-compare plugin by using the following command:

    $ oc cluster-compare -r <path_to_reference_config>/metadata.yaml

    • -r specifies a path to the metadata.yaml file of the reference configuration. You can specify a local directory or a URI.

      Example output
      
...

**********************************

Cluster CR: operator.openshift.io/v1_Console_cluster (1)
Reference File: optional/console-disable/ConsoleOperatorDisable.yaml (2)
Diff Output: diff -u -N /tmp/MERGED-622469311/operator-openshift-io-v1_console_cluster /tmp/LIVE-2358803347/operator-openshift-io-v1_console_cluster
/tmp/MERGED-622469311/operator-openshift-io-v1_console_cluster	2024-11-20 15:43:42.888633602 +0000
+++ /tmp/LIVE-2358803347/operator-openshift-io-v1_console_cluster	2024-11-20 15:43:42.888633602 +0000
@@ -4,5 +4,5 @@
   name: cluster
 spec:
   logLevel: Normal
-  managementState: Removed (3)
+  managementState: Managed
   operatorLogLevel: Normal

**********************************

…

Summary (4)
CRs with diffs: 5/49 (5)
CRs in reference missing from the cluster: 1 (6)
required-cluster-tuning:
  cluster-tuning:
    Missing CRs: (7)
    - required/cluster-tuning/disabling-network-diagnostics/DisableSnoNetworkDiag.yaml
No CRs are unmatched to reference CRs (8)
Metadata Hash: 512a9bf2e57fd5a5c44bbdea7abb3ffd7739d4a1f14ef9021f6793d5cdf868f0 (9)
No patched CRs (10)
      1 The CR under comparison. The plugin displays each CR with a difference from the corresponding template.
      2 The template matching with the CR for comparison.
      3 The output in Linux diff format shows the difference between the template and the cluster CR.
      4 After the plugin reports the line diffs for each CR, the summary of differences are reported.
      5 The number of CRs in the comparison with differences from the corresponding templates.
      6 The number of CRs represented in the reference configuration, but missing from the live cluster.
      7 The list of CRs represented in the reference configuration, but missing from the live cluster.
      8 The CRs that did not match to a corresponding template in the reference configuration.
      9 The metadata hash identifies the reference configuration.
      10 The list of patched CRs.

Using the cluster-compare plugin with must-gather data

You can use the cluster-compare plugin to compare a reference configuration with configuration custom resources (CRs) from must-gather data.

Validate cluster configurations by using must-gather data to troubleshoot configuration issues in production environments.

For production environments, use the cluster-compare plugin with must-gather data only.

  • You have access to must-gather data from a target cluster.

  • You installed the OpenShift CLI (oc).

  • You have downloaded the cluster-compare plugin and included it in your PATH environment variable.

  • You have access to a reference configuration.

Procedure

  • Compare the must-gather data to a reference configuration by running the following command:

    $ oc cluster-compare -r <path_to_reference_config>/metadata.yaml -f "must-gather*/*/cluster-scoped-resources","must-gather*/*/namespaces" -R

    • -r specifies a path to the metadata.yaml file of the reference configuration. You can specify a local directory or a URI.

    • -f specifies the path to the must-gather data directory. You can specify a local directory or a URI. This example restricts the comparison to the relevant cluster configuration directories.

    • -R searches the target directories recursively.

      Example output
      ...

**********************************

Cluster CR: operator.openshift.io/v1_Console_cluster (1)
Reference File: optional/console-disable/ConsoleOperatorDisable.yaml (2)
Diff Output: diff -u -N /tmp/MERGED-622469311/operator-openshift-io-v1_console_cluster /tmp/LIVE-2358803347/operator-openshift-io-v1_console_cluster
/tmp/MERGED-622469311/operator-openshift-io-v1_console_cluster	2024-11-20 15:43:42.888633602 +0000
+++ /tmp/LIVE-2358803347/operator-openshift-io-v1_console_cluster	2024-11-20 15:43:42.888633602 +0000
@@ -4,5 +4,5 @@
   name: cluster
 spec:
   logLevel: Normal
-  managementState: Removed (3)
+  managementState: Managed
   operatorLogLevel: Normal

**********************************

…

Summary (4)
CRs with diffs: 5/49 (5)
CRs in reference missing from the cluster: 1 (6)
required-cluster-tuning:
  cluster-tuning:
    Missing CRs: (7)
    - required/cluster-tuning/disabling-network-diagnostics/DisableSnoNetworkDiag.yaml
No CRs are unmatched to reference CRs (8)
Metadata Hash: 512a9bf2e57fd5a5c44bbdea7abb3ffd7739d4a1f14ef9021f6793d5cdf868f0 (9)
No patched CRs (10)
      1 The CR under comparison. The plugin displays each CR with a difference from the corresponding template.
      2 The template matching with the CR for comparison.
      3 The output in Linux diff format shows the difference between the template and the cluster CR.
      4 After the plugin reports the line diffs for each CR, the summary of differences are reported.
      5 The number of CRs in the comparison with differences from the corresponding templates.
      6 The number of CRs represented in the reference configuration, but missing from the live cluster.
      7 The list of CRs represented in the reference configuration, but missing from the live cluster.
      8 The CRs that did not match to a corresponding template in the reference configuration.
      9 The metadata hash identifies the reference configuration.
      10 The list of patched CRs.
Additional resources

Reference cluster-compare plugin options

The following content describes the options for the cluster-compare plugin.

Table 1. Cluster-compare plugin options
Option Description

-A, --all-resources

When used with a live cluster, attempts to match all resources in the cluster that match a type in the reference configuration. When used with local files, attempts to match all resources in the local files that match a type in the reference configuration.

--concurrency

Specify an integer value for the number of templates to process in parallel when comparing with resources from the live version. A larger number increases speed but also memory, I/O, and CPU usage during that period. The default value is 4.

-c, --diff-config

Specify the path to the user configuration file.

-f, --filename

Specify a filename, directory, or URL for the configuration custom resources that you want to use for a comparison with a reference configuration.

--generate-override-for

Specify the path for templates that requires a patch.

You must use a file path for the target template that is relative to the metadata.yaml file. For example, if the file path for the metadata.yaml file is ./compare/metadata.yaml, a relative file path for the template might be optional/my-template.yaml.

-h, --help

Display help information.

-k, --kustomize

Specify a path to process the kustomization directory. This flag cannot be used together with -f or -R.

-o, --output

Specify the output format. Options include json, yaml, or generate-patches.

--override-reason

Specify a reason for generating the override.

-p, --overrides

Specify a path to a patch override file for the reference configuration.

-R, --recursive

Processes the directory specified in -f, --filename recursively.

-r, --reference

Specify the path to the reference configuration metadata.yaml file.

--show-managed-fields

Specify true to include managed fields in the comparison.

-v, --verbose

Increases the verbosity of the plugin output.

Example: Comparing a cluster with the telco core reference configuration

You can use the cluster-compare plugin to compare a reference configuration with a configuration from a live cluster or must-gather data.

This example compares a configuration from a live cluster with the telco core reference configuration. The telco core reference configuration is derived from the telco core reference design specifications (RDS). The telco core RDS is designed for clusters to support large scale telco applications including control plane and some centralized data plane functions.

The reference configuration is packaged in a container image with the telco core RDS.

For further examples of using the cluster-compare plugin with the telco core and telco RAN distributed unit (DU) profiles, see the "Additional resources" section.

Prerequisites

  • You have access to the cluster as a user with the cluster-admin role.

  • You have credentials to access the registry.redhat.io container image registry.

  • You installed the cluster-compare plugin.

Procedure

  1. Login to the container image registry with your credentials by running the following command:

    $ podman login registry.redhat.io

  2. Extract the content from the telco-core-rds-rhel9 container image by running the following commands:

    $ mkdir -p ./out
    $ podman run -it registry.redhat.io/openshift4/openshift-telco-core-rds-rhel9:v4.17 | base64 -d | tar xv -C out

    You can view the reference configuration in the reference-crs-kube-compare/ directory.

    out/telco-core-rds/configuration/reference-crs-kube-compare/
├── metadata.yaml (1)
├── optional (2)
│   ├── logging
│   ├── networking
│   ├── other
│   └── tuning
└── required (3)
    ├── networking
    ├── other
    ├── performance
    ├── scheduling
    └── storage
    1 Configuration file for the reference configuration.
    2 Directory for optional templates.
    3 Directory for required templates.

  3. Compare the configuration for your cluster to the telco core reference configuration by running the following command:

    $ oc cluster-compare -r out/telco-core-rds/configuration/reference-crs-kube-compare/metadata.yaml
    Example output
    W1212 14:13:06.281590   36629 compare.go:425] Reference Contains Templates With Types (kind) Not Supported By Cluster: BFDProfile, BGPAdvertisement, BGPPeer, ClusterLogForwarder, Community, IPAddressPool, MetalLB, MultiNetworkPolicy, NMState, NUMAResourcesOperator, NUMAResourcesScheduler, NodeNetworkConfigurationPolicy, SriovNetwork, SriovNetworkNodePolicy, SriovOperatorConfig, StorageCluster

...

**********************************

Cluster CR: config.openshift.io/v1_OperatorHub_cluster (1)
Reference File: required/other/operator-hub.yaml (2)
Diff Output: diff -u -N /tmp/MERGED-2801470219/config-openshift-io-v1_operatorhub_cluster /tmp/LIVE-2569768241/config-openshift-io-v1_operatorhub_cluster
--- /tmp/MERGED-2801470219/config-openshift-io-v1_operatorhub_cluster	2024-12-12 14:13:22.898756462 +0000
+++ /tmp/LIVE-2569768241/config-openshift-io-v1_operatorhub_cluster	2024-12-12 14:13:22.898756462 +0000
@@ -1,6 +1,6 @@
 apiVersion: config.openshift.io/v1
 kind: OperatorHub
 metadata:
+  annotations: (3)
+    include.release.openshift.io/hypershift: "true"
   name: cluster
-spec:
-  disableAllDefaultSources: true

**********************************

Summary (4)
CRs with diffs: 3/4 (5)
CRs in reference missing from the cluster: 22 (6)
other:
  other:
    Missing CRs: (7)
    - optional/other/control-plane-load-kernel-modules.yaml
    - optional/other/worker-load-kernel-modules.yaml
required-networking:
  networking-root:
    Missing CRs:
    - required/networking/nodeNetworkConfigurationPolicy.yaml
  networking-sriov:
    Missing CRs:
    - required/networking/sriov/sriovNetwork.yaml
    - required/networking/sriov/sriovNetworkNodePolicy.yaml
    - required/networking/sriov/SriovOperatorConfig.yaml
    - required/networking/sriov/SriovSubscription.yaml
    - required/networking/sriov/SriovSubscriptionNS.yaml
    - required/networking/sriov/SriovSubscriptionOperGroup.yaml
required-other:
  scheduling:
    Missing CRs:
    - required/other/catalog-source.yaml
    - required/other/icsp.yaml
required-performance:
  performance:
    Missing CRs:
    - required/performance/PerformanceProfile.yaml
required-scheduling:
  scheduling:
    Missing CRs:
    - required/scheduling/nrop.yaml
    - required/scheduling/NROPSubscription.yaml
    - required/scheduling/NROPSubscriptionNS.yaml
    - required/scheduling/NROPSubscriptionOperGroup.yaml
    - required/scheduling/sched.yaml
required-storage:
  storage-odf:
    Missing CRs:
    - required/storage/odf-external/01-rook-ceph-external-cluster-details.secret.yaml
    - required/storage/odf-external/02-ocs-external-storagecluster.yaml
    - required/storage/odf-external/odfNS.yaml
    - required/storage/odf-external/odfOperGroup.yaml
    - required/storage/odf-external/odfSubscription.yaml
No CRs are unmatched to reference CRs (8)
Metadata Hash: fe41066bac56517be02053d436c815661c9fa35eec5922af25a1be359818f297 (9)
No patched CRs (10)
    1 The CR under comparison. The plugin displays each CR with a difference from the corresponding template.
    2 The template matching with the CR for comparison.
    3 The output in Linux diff format shows the difference between the template and the cluster CR.
    4 After the plugin reports the line diffs for each CR, the summary of differences are reported.
    5 The number of CRs in the comparison with differences from the corresponding templates.
    6 The number of CRs represented in the reference configuration, but missing from the live cluster.
    7 The list of CRs represented in the reference configuration, but missing from the live cluster.
    8 The CRs that did not match to a corresponding template in the reference configuration.
    9 The metadata hash identifies the reference configuration.
    10 The list of patched CRs.

Additional resources