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:
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.
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.
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.
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.
If you need to provide trusted certificates, the Keycloak CR provides a top level feature for configuring the server's truststore as discussed in <@links.server id="keycloak-truststore"/>.
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:
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.
