Keycloak - ACA deployment (multiple replica issue)

[kaustubh-jazzx]

Hi Team,

I have deployed keycloak v26 inside Azure Container Apps with min-max-replicas = 1. But as soon as I increase the replica count min-max-replicas > 1 it gives issue of session timeout. I am using below command to start keycloak inside ACA
/opt/keycloak/bin/kc.sh start and as per documentation ideally it enables cache ispn to manage and sync user session across replicas using jdbc-ping default cache-stack. But when I checked my console it is enabling the cache ispn but it is using multicast udp stack to communicate with replicas for syncing session which Azure Container Apps not supports. Is there any solution to change that stack ? I tried by adding command /opt/keycloak/bin/kc.sh start --cache-stack=jdbc-ping but it didn't deploy container and also getting error

ERROR [org.infinispan.CONFIG] (ForkJoinPool.commonPool-worker-1) ISPN000660: DefaultCacheManager start failed, stopping any running components: org.infinispan.commons.CacheConfigurationException: ISPN000540: No such JGroups stack 'jdbc-ping'

Below is cache-ispn.xml which I found inside my container.

`

<cache-container name="keycloak">
    <transport lock-timeout="60000" stack="udp"/>
    <local-cache name="realms" simple-cache="true">
        <encoding>
            <key media-type="application/x-java-object"/>
            <value media-type="application/x-java-object"/>
        </encoding>
        <memory max-count="10000"/>
    </local-cache>
    <local-cache name="users" simple-cache="true">
        <encoding>
            <key media-type="application/x-java-object"/>
            <value media-type="application/x-java-object"/>
        </encoding>
        <memory max-count="10000"/>
    </local-cache>
    <distributed-cache name="sessions" owners="1">
        <expiration lifespan="-1"/>
        <memory max-count="10000"/>
    </distributed-cache>
    <distributed-cache name="authenticationSessions" owners="2">
        <expiration lifespan="-1"/>
    </distributed-cache>
    <distributed-cache name="offlineSessions" owners="1">
        <expiration lifespan="-1"/>
        <memory max-count="10000"/>
    </distributed-cache>
    <distributed-cache name="clientSessions" owners="1">
        <expiration lifespan="-1"/>
        <memory max-count="10000"/>
    </distributed-cache>
    <distributed-cache name="offlineClientSessions" owners="1">
        <expiration lifespan="-1"/>
        <memory max-count="10000"/>
    </distributed-cache>
    <distributed-cache name="loginFailures" owners="2">
        <expiration lifespan="-1"/>
    </distributed-cache>
    <local-cache name="authorization" simple-cache="true">
        <encoding>
            <key media-type="application/x-java-object"/>
            <value media-type="application/x-java-object"/>
        </encoding>
        <memory max-count="10000"/>
    </local-cache>
    <replicated-cache name="work">
        <expiration lifespan="-1"/>
    </replicated-cache>
    <local-cache name="keys" simple-cache="true">
        <encoding>
            <key media-type="application/x-java-object"/>
            <value media-type="application/x-java-object"/>
        </encoding>
        <expiration max-idle="3600000"/>
        <memory max-count="1000"/>
    </local-cache>
    <distributed-cache name="actionTokens" owners="2">
        <encoding>
            <key media-type="application/x-java-object"/>
            <value media-type="application/x-java-object"/>
        </encoding>
        <expiration max-idle="-1" lifespan="-1" interval="300000"/>
        <memory max-count="-1"/>
    </distributed-cache>
</cache-container>

`