
:guide-id: advanced-configuration
:guide-title: Advanced configuration
:guide-summary: How to tune advanced aspects of the Keycloak CR
:guide-priority: 999
:guide-tile-visible: true
:version: 26.0.2

include::../attributes.adoc[]

[[advanced-configuration]]
= Advanced configuration

ifeval::["" == "true"]
WARNING: This {section} is describing a feature which is currently in preview.
ifeval::["" == ""]
Please provide your feedback while we’re continuing to work on this.
endif::[]
ifeval::["" != ""]
Please provide your feedback by link:[joining this discussion] while we’re continuing to work on this.
endif::[]
endif::[]


== Advanced configuration
This {section} describes how to use Custom Resources (CRs) for advanced configuration of your {project_name} deployment.

=== Server configuration details

Many server options are exposed as first-class citizen fields in the Keycloak CR. The structure of the CR is based on the configuration structure of {project_name}. For example, to configure the `https-port` of the server, follow a
similar pattern in the CR and use the `httpsPort` field. The following example is a complex server configuration; however, it illustrates the relationship between server options and the Keycloak CR:

[source,yaml]
----
apiVersion: k8s.keycloak.org/v2alpha1
kind: Keycloak
metadata:
  name: example-kc
spec:
  db:
    vendor: postgres
    usernameSecret:
      name: usernameSecret
      key: usernameSecretKey
    passwordSecret:
      name: passwordSecret
      key: passwordSecretKey
    host: host
    database: database
    port: 123
    schema: schema
    poolInitialSize: 1
    poolMinSize: 2
    poolMaxSize: 3
  http:
    httpEnabled: true
    httpPort: 8180
    httpsPort: 8543
    tlsSecret: my-tls-secret
  hostname:
    hostname: https://my-hostname.tld
    admin: https://my-hostname.tld/admin
    strict: false
    backchannelDynamic: true
  features:
    enabled:
      - docker
      - authorization
    disabled:
      - admin
      - step-up-authentication
  transaction:
    xaEnabled: false
----

For a list of options, see the Keycloak CRD. For details on configuring options, see link:{links_server_all-config_url}[{links_server_all-config_name}].

==== Additional options

Some expert server options are unavailable as dedicated fields in the Keycloak CR. The following are examples of omitted fields:

* Fields that require deep understanding of the underlying {project_name} implementation
* Fields that are not relevant to
ifeval::[{project_product} != true]
a Kubernetes
endif::[]
ifeval::[{project_product} == true]
an OpenShift
endif::[]
environment
* Fields for provider configuration because they are dynamic based on the used provider implementation

The `additionalOptions` field of the Keycloak CR enables {project_name} to accept any available configuration in the form of key-value pairs.
You can use this field to include any option that is omitted in the Keycloak CR.
For details on configuring options, see link:{links_server_all-config_url}[{links_server_all-config_name}].

The values can be expressed as plain text strings or Secret object references as shown in this example:

[source,yaml]
----
apiVersion: k8s.keycloak.org/v2alpha1
kind: Keycloak
metadata:
  name: example-kc
spec:
  ...
  additionalOptions:
    - name: spi-connections-http-client-default-connection-pool-size
      secret: # Secret reference
        name: http-client-secret # name of the Secret
        key: poolSize # name of the Key in the Secret
    - name: spi-email-template-mycustomprovider-enabled
      value: true # plain text value
----
NOTE:  The name format of options defined in this way is identical to the key format of options specified in the configuration file.
       For details on various configuration formats, see link:{links_server_configuration_url}[{links_server_configuration_name}].

=== Secret References

Secret References are used by some dedicated options in the Keycloak CR, such as `tlsSecret`, or as a value in `additionalOptions`.

Similarly ConfigMap References are used by options such as the `configMapFile`.

When specifying a Secret or ConfigMap Reference, make sure that a Secret or ConfigMap containing the referenced keys is present in the same namespace as the CR referencing it.

The operator will poll approximately every minute for changes to referenced Secrets or ConfigMaps. When a meaningful change is detected, the Operator performs a rolling restart of the {project_name} Deployment to pick up the changes.

=== Unsupported features

The `unsupported` field of the CR contains highly experimental configuration options that are not completely tested and are Tech Preview.

==== Pod Template

The Pod Template is a raw API representation that is used for the Deployment Template.
This field is a temporary workaround in case no supported field exists at the top level of the CR for your use case.

The Operator merges the fields of the provided template with the values generated by the Operator for the specific Deployment.
With this feature, you have access to a high level of customizations. However, no guarantee exists that the Deployment will work as expected.

The following example illustrates injecting labels, annotations, volumes, and volume mounts:

[source,yaml]
----
apiVersion: k8s.keycloak.org/v2alpha1
kind: Keycloak
metadata:
  name: example-kc
spec:
  ...
  unsupported:
    podTemplate:
      metadata:
        labels:
          my-label: "keycloak"
      spec:
        containers:
          - volumeMounts:
              - name: test-volume
                mountPath: /mnt/test
        volumes:
          - name: test-volume
            secret:
              secretName: keycloak-additional-secret
----

=== Disabling required options

{project_name} and the {project_name} Operator provide the best production-ready experience with security in mind.
However, during the development phase, you can disable key security features.

Specifically, you can disable the hostname and TLS as shown in the following example:

[source,yaml]
----
apiVersion: k8s.keycloak.org/v2alpha1
kind: Keycloak
metadata:
  name: example-kc
spec:
  ...
  http:
    httpEnabled: true
  hostname:
    strict: false
----

=== Resource requirements

The Keycloak CR allows specifying the `resources` options for managing compute resources for the {project_name} container.
It provides the ability to request and limit resources independently for the main Keycloak deployment via the Keycloak CR, and for the realm import Job via the Realm Import CR.

When no values are specified, the default `requests` memory is set to `1700MiB`, and the `limits` memory is set to `2GiB`.
These values were chosen based on a deeper analysis of {project_name} memory management.

If no values are specified in the Realm Import CR, it falls back to the values specified in the Keycloak CR, or to the defaults as defined above.

You can specify your custom values based on your requirements as follows:

[source,yaml]
----
apiVersion: k8s.keycloak.org/v2alpha1
kind: Keycloak
metadata:
  name: example-kc
spec:
  ...
  resources:
    requests:
      cpu: 1200m
      memory: 896Mi
    limits:
      cpu: 6
      memory: 3Gi
----

Moreover, the {project_name} container manages the heap size more effectively by providing relative values for the heap size.
It is achieved by providing certain JVM options.

For more details, see link:{links_server_containers_url}[{links_server_containers_name}].

=== Scheduling

You may control several aspects of the server Pod scheduling via the Keycloak CR. The scheduling stanza exposes optional standard Kubernetes affinity, tolerations, topology spread constraints, and the priority class name to fine tune the scheduling and placement of your server Pods.

An example utilizing all scheduling fields:

[source,yaml]
----
apiVersion: k8s.keycloak.org/v2alpha1
kind: Keycloak
metadata:
  name: example-kc
spec:
  scheduling:
    priorityClassName: custom-high
    affinity:
      podAffinity:
        preferredDuringSchedulingIgnoredDuringExecution:
        - podAffinityTerm:
            labelSelector:
              matchLabels:
                app: keycloak
                app.kubernetes.io/managed-by: keycloak-operator
                app.kubernetes.io/component: server
                topologyKey: topology.kubernetes.io/zone
              weight: 10
    tolerations:
    - key: "some-taint"
      operator: "Exists"
      effect: "NoSchedule"
    topologySpreadConstraints:
    - maxSkew: 1
      topologyKey: kubernetes.io/hostname
      whenUnsatisfiable: DoNotSchedule
      ...
  ...
----

Please see https://kubernetes.io/docs/concepts/scheduling-eviction[the kubernetes docs] for more on scheduling concepts.

If you do not specify a custom affinity, your Pods will have an affinity for the same zone and an anti-affinity for the same node to improve availability. Scheduling to the same zone if possible helps prevent stretch clusters where cross zone cache cluster traffic may have too high of a latency.

=== Management Interface

To change the port of the management interface, use the first-class citizen field `httpManagement.port` in the Keycloak CR.
To change the properties of the management interface, you can do it by providing `additionalOptions` field.

You can specify the `port` and the `additionalOptions` as follows:

[source,yaml]
----
apiVersion: k8s.keycloak.org/v2alpha1
kind: Keycloak
metadata:
  name: example-kc
spec:
  httpManagement:
    port: 9001
  additionalOptions:
    - name: http-management-relative-path
      value: /management
----

NOTE: If you are using a custom image, the Operator is *unaware* of any configuration options that might've been specified there.
For instance, it may cause that the management interface uses the `https` schema, but the Operator accesses it via `http` when the TLS settings is specified in the custom image.
To ensure proper TLS configuration, use the `tlsSecret` and `truststores` fields in the Keycloak CR so that the Operator can reflect that.

=== Truststores

If you need to provide trusted certificates, the Keycloak CR provides a top level feature for configuring the server's truststore as discussed in link:{links_server_keycloak-truststore_url}[{links_server_keycloak-truststore_name}].

Use the truststores stanza of the Keycloak spec to specify Secrets containing PEM encoded files, or PKCS12 files with extension `.p12` or `.pfx`, for example:

[source,yaml]
----
apiVersion: k8s.keycloak.org/v2alpha1
kind: Keycloak
metadata:
  name: example-kc
spec:
  ...
  truststores:
    my-truststore:
      secret:
        name: my-secret
----

Where the contents of my-secret could be a PEM file, for example:

[source,yaml]
------
apiVersion: v1
kind: Secret
metadata:
  name: my-secret
stringData:
  cert.pem: |
    -----BEGIN CERTIFICATE-----
    ...
------

When running on a Kubernetes or OpenShift environment well-known locations of trusted certificates are included automatically.
This includes `/var/run/secrets/kubernetes.io/serviceaccount/ca.crt` and the `/var/run/secrets/kubernetes.io/serviceaccount/service-ca.crt` when present.

=== Admin Bootstrapping

When you create a new instance the Keycloak CR spec.bootstrapAdmin stanza may be used to configure the bootstrap user and/or service account. If you do not specify anything for the spec.bootstrapAdmin, the operator will create a Secret named "metadata.name"-initial-admin with a username temp-admin and a generated password. If you specify a Secret name for bootstrap admin user, then the Secret will need to contain `username` and `password` key value pairs. If you specify a Secret name for bootstrap admin service account, then the Secret will need to contain `client-id` and `client-secret` key value pairs.

If a master realm has already been created for you cluster, then the spec.boostrapAdmin is effectively ignored. If you need to create a recovery admin account, then you'll need to run the CLI command against a Pod directly.

For more information on how to bootstrap a temporary admin user or service account and recover lost admin access, refer to the link:{links_server_bootstrap-admin-recovery_url}[{links_server_bootstrap-admin-recovery_name}] guide.


