Master and Slave servers reporting different settings for same Realm in Keycloak console

Getting advice
1

Hello,
I am running Keycloak in cluster mode with 1 master and 1 slave. Both have been configure with the same database URL, and the slave is able to connect to the master. When I log in and change settings (like the Realm display name), they are not propagated correctly. I have one session connected to the master, and one session connected to the slave. When I save settings on the master, the slave session doesn’t report the updated settings. I am not sure where to start debugging this. I have checked the domain.xml on both instances and the datasources are identical (pretty much the whole config directory is the same, only the startup arguments are different). Any ideas?

Thanks

2

Tried setting up 2 instances in standalone-ha mode instead, and I am still seeing the same behaviour. Is there anything else I need to configure for the changes to be persisted properly and synchronized between the two instances?

3

My issue turned out to be due to the local cache not being invalidated on all servers in the cluster when I updated settings. This was ultimately because I am running everything in an AWS VPC, and multicast is not supported in that environment (which is what’s used to send the invalidation messages to all the servers in the cluster).