I have a running keycloak 8's docker but whenever I restart it, all non-offline session disappears. Result, all users are being disconnected whenever I come to update keycloak.
As solution I've wanted to use Clusters (as recommended here), and I understood, that the core part is only well managing Infinispan.
I first wanted to store that infinispan outside docker container (in a volume), then search where does the JBoss saves Infinispan in a docker, but i didn't found anything.
Secondly I thought about an SPI to manage user sessions externally, but it seems not to be the right solution, as infinispan does already a good Job.
Setting up then a cluster, helped by this article about Cross-Datacenter support in Keycloak and this other one about Keycloak Cross Data Center Setup in AWS seemed to be a good starting point, but I'm still actually using dockers and I not sure if it's a better idea for me to build docker images from those tutorials.
Any more Idea would be welcome :)
Just yet I've tried using docker cluster a second time, but now using docker swarm with the info from here:
The PING discovery protocol is used by default in udp stack (which is used by default in standalone-ha.xml). Since the Keycloak image runs in clustered mode by default, all you need to do is to run it:
docker run jboss/keycloakIf you run two instances of it locally, you will notice that they form a cluster.
I've deployed very simply 3 instances of keycloak in clustered mode with an external database (postgres) using docker stack and it worked well.
Simpler said, keycloak docker does already handle this use-case when using clusters.
For more about the cluster use-case, please refer to this tutorial about how to setup Keycloak Cluster