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Chapter 1. Red Hat build of Keycloak Operator installation

Use this procedure to install the Red Hat build of Keycloak Operator in an OpenShift cluster.

  1. Open the OpenShift Container Platform web console.
  2. In the left column, click Home, Operators, OperatorHub.
  3. Search for "Keycloak" on the search input box.
  4. Select the Operator from the list of results.
  5. Follow the instructions on the screen.

For general instructions on installing Operators by using either the CLI or web console, see Installing Operators in your namespace. In the default Catalog, the Operator is named rhbk-operator. Make sure to use the channel corresponding with your desired Red Hat build of Keycloak version.

1.1. Installing Multiple Operators
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It is not fully supported for the operator to watch multiple or all namespaces. To watch multiple namespaces, you install multiple operators.

In this situation, consider the following:

  • All Operators share the Custom Resource Definitions (CRDs) as they are installed cluster wide.
  • CRD revisions from newer Operator versions will not introduce breaking changes except for the eventual removal of fields that have been deprecated for some time. Thus newer CRDs are generally backward compatible.
  • The last installed CRDs become the ones that are used. This rule also applies to OLM installations; the last installed Operator version also installs and overrides the CRDs if they already exist in the cluster.
  • Older CRDs may not be forward compatible with new fields used by newer operators. When using OLM it will check if your custom resources are compatible with the CRDs being installed, so the usage of new fields can prevent the simultaneous installation of older operator versions.
  • Fields introduced by newer CRDs are not supported by older Operators. Older Operators fail to handle CRs that use such new fields with a deserialization error for an unrecognized field.

Therefore, in a multiple Operator installation scenario, the recommended approach is to keep versions aligned as closely as possible to minimize the potential problems with different versions.

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