keycloak-scim/docs/guides/high-availability/deploy-infinispan-kubernetes-crossdc.adoc

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<@tmpl.guide
title="Deploy {jdgserver_name} for HA with the {jdgserver_name} Operator"
summary="Building block for an {jdgserver_name} deployment on Kubernetes"
preview="true"
previewDiscussionLink="https://github.com/keycloak/keycloak/discussions/25269"
tileVisible="false" >

include::partials/infinispan/infinispan-attributes.adoc[]

This {section} describes the procedures required to deploy {jdgserver_name} in a multiple-cluster environment (cross-site).
For simplicity, this topic uses the minimum configuration possible that allows {project_name} to be used with an external {jdgserver_name}.

This {section} assumes two {ocp} clusters named `{site-a}` and `{site-b}`.

This is a building block following the concepts described in the <@links.ha id="concepts-active-passive-sync" /> {section}.
See the <@links.ha id="introduction" /> {section} for an overview.

== Architecture

This setup deploys two synchronously replicating {jdgserver_name} clusters in two sites with a low-latency network connection.
An example of this scenario could be two availability zones in one AWS region.

{project_name}, loadbalancer and database have been removed from the following diagram for simplicity.

image::high-availability/infinispan-crossdc-az.dio.svg[]

== Prerequisites

include::partials/infinispan/infinispan-prerequisites.adoc[]

== Procedure

include::partials/infinispan/infinispan-install-operator.adoc[]
include::partials/infinispan/infinispan-credentials.adoc[]
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These commands must be executed on both {ocp} clusters.

. Create a service account.
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A service account is required to establish a connection between clusters.
The {ispn-operator} uses it to inspect the network configuration from the remote site and to configure the local {jdgserver_name} cluster accordingly.
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For more details, see the {infinispan-operator-docs}#managed-cross-site-connections_cross-site[Managing Cross-Site Connections] documentation.
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.. First, create the service account and generate an access token in both {ocp} clusters.
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.Create the service account in `{site-a}`
[source,bash,subs="+attributes"]
----
kubectl create sa -n {ns} {sa}
kubectl policy add-role-to-user view -n {ns} -z {sa}
kubectl create token -n {ns} {sa} > {site-a}-token.txt
----
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.Create the service account in `{site-b}`
[source,bash,subs="+attributes"]
----
kubectl create sa -n {ns} {sa}
kubectl policy add-role-to-user view -n {ns} -z {sa}
kubectl create token -n {ns} {sa} > {site-b}-token.txt
----
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.. The next step is to deploy the token from `{site-a}` into `{site-b}` and the reverse:
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.Deploy `{site-b}` token into `{site-a}`
[source,bash,subs="+attributes"]
----
kubectl create secret generic -n {ns} {sa-secret} \
  --from-literal=token="$(cat {site-b}-token.txt)"
----
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.Deploy `{site-a}` token into `{site-b}`
[source,bash,subs="+attributes"]
----
kubectl create secret generic -n {ns} {sa-secret} \
  --from-literal=token="$(cat {site-a}-token.txt)"
----

. Create TLS secrets
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In this {section}, {jdgserver_name} uses an {ocp} Route for the cross-site communication.
It uses the SNI extension of TLS to direct the traffic to the correct Pods.
To achieve that, JGroups use TLS sockets, which require a Keystore and Truststore with the correct certificates.
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For more information, see the {infinispan-operator-docs}#securing-cross-site-connections_cross-site[Securing Cross Site Connections] documentation or this https://developers.redhat.com/learn/openshift/cross-site-and-cross-applications-red-hat-openshift-and-red-hat-data-grid[Red Hat Developer Guide].
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Upload the Keystore and the Truststore in an {ocp} Secret.
The secret contains the file content, the password to access it, and the type of the store.
Instructions for creating the certificates and the stores are beyond the scope of this guide.
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To upload the Keystore as a Secret, use the following command:
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.Deploy a Keystore
[source,bash,subs="+attributes"]
----
kubectl -n {ns} create secret generic {ks-secret} \
  --from-file=keystore.p12="./certs/keystore.p12" \ # <1>
  --from-literal=password=secret \ #<2>
  --from-literal=type=pkcs12 #<3>
----
<1> The filename and the path to the Keystore.
<2> The password to access the Keystore.
<3> The Keystore type.
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To upload the Truststore as a Secret, use the following command:
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.Deploy a Truststore
[source,bash,subs="+attributes"]
----
kubectl -n {ns} create secret generic {ts-secret} \
        --from-file=truststore.p12="./certs/truststore.p12" \  # <1>
        --from-literal=password=caSecret \  # <2>
        --from-literal=type=pkcs12  # <3>
----
<1> The filename and the path to the Truststore.
<2> The password to access the Truststore.
<3> The Truststore type.
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NOTE: Keystore and Truststore must be uploaded in both {ocp} clusters.

. Create an {jdgserver_name} Cluster with Cross-Site enabled
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The {infinispan-operator-docs}#setting-up-xsite[Setting Up Cross-Site] documentation provides all the information on how to create and configure your {jdgserver_name} cluster with cross-site enabled, including the previous steps.
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A basic example is provided in this {section} using the credentials, tokens, and TLS Keystore/Truststore created by the commands from the previous steps.
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.The {jdgserver_name} CR for `{site-a}`
[source,yaml]
----
include::examples/generated/ispn-site-a.yaml[tag=infinispan-crossdc]
----
<1> The cluster name
<2> Allows the cluster to be monitored by Prometheus.
<3> If using a custom credential, configure here the secret name.
<4> The name of the local site, in this case `{site-a}`.
<5> Exposing the cross-site connection using {ocp} Route.
<6> The secret name where the Keystore exists as defined in the previous step.
<7> The alias of the certificate inside the Keystore.
<8> The secret key (filename) of the Keystore as defined in the previous step.
<9> The secret name where the Truststore exists as defined in the previous step.
<10> The Truststore key (filename) of the Keystore as defined in the previous step.
<11> The remote site's name, in this case  `{site-b}`.
<12> The namespace of the {jdgserver_name} cluster from the remote site.
<13> The {ocp} API URL for the remote site.
<14> The secret with the access toke to authenticate into the remote site.
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For `{site-b}`, the {jdgserver_name} CR looks similar to the above.
Note the differences in point 4, 11 and 13.
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.The {jdgserver_name} CR for `{site-b}`
[source,yaml]
----
include::examples/generated/ispn-site-b.yaml[tag=infinispan-crossdc]
----

. Creating the caches for {project_name}.
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{project_name} requires the following caches to be present: `sessions`, `actionTokens`, `authenticationSessions`, `offlineSessions`, `clientSessions`, `offlineClientSessions`, `loginFailures`, and `work`.
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The {jdgserver_name} {infinispan-operator-docs}#creating-caches[Cache CR] allows deploying the caches in the {jdgserver_name} cluster.
Cross-site needs to be enabled per cache as documented by {infinispan-xsite-docs}[Cross Site Documentation].
The documentation contains more details about the options used by this {section}.
The following example shows the Cache CR for `{site-a}`.
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.sessions in `{site-a}`
[source,yaml]
----
include::examples/generated/ispn-site-a.yaml[tag=infinispan-cache-sessions]
----
<1> The cross-site merge policy, invoked when there is a write-write conflict.
Set this for the caches `sessions`, `authenticationSessions`, `offlineSessions`, `clientSessions` and `offlineClientSessions`, and do not set it for all other caches.
<2> The remote site name.
<3> The cross-site communication, in this case, `SYNC`.
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For `{site-b}`, the Cache CR is similar except in point 2.
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.session in `{site-b}`
[source,yaml]
----
include::examples/generated/ispn-site-b.yaml[tag=infinispan-cache-sessions]
----

== Verifying the deployment

Confirm that the {jdgserver_name} cluster is formed, and the cross-site connection is established between the {ocp} clusters.

.Wait until the {jdgserver_name} cluster is formed
[source,bash,subs="+attributes"]
----
kubectl wait --for condition=WellFormed --timeout=300s infinispans.infinispan.org -n {ns} {cluster-name}
----

.Wait until the {jdgserver_name} cross-site connection is established
[source,bash,subs="+attributes"]
----
kubectl wait --for condition=CrossSiteViewFormed --timeout=300s infinispans.infinispan.org -n {ns} {cluster-name}
----

== Next steps

After infinispan is deployed and running, use the procedure in the <@links.ha id="connect-keycloak-to-external-infinispan"/> {section} to connect your {project_name} cluster with the {jdgserver_name} cluster.

</@tmpl.guide>