[keycloak-dev] TCP for JGroups and bind options

Hey, I've been working on JGroups bind settings for Keycloak Container Image recently and we had a discussion with Stian about changing both binding options and transport for JGroups. As you probably know, we use standalone-ha.xml as a default configuration for our image. This means, that Infinispan boots up in clustered mode. At the moment, we use the default transport from the configuration, which is UDP (with PING as discovery). Even though UDP transport is a bit faster for larger clusters, it often doesn't work out of the box in cloud environments (like AWS for the instance). Of course, the JGroups stack can easily be changed by using the `-Djboss.default.jgroups.stack=tcp` switch. I'm planning to revise this piece and change the default transport to TCP (probably by adding `-Djboss.default.jgroups.stack=tcp` switch to the default options). I also proposed, and would like to ask you to try it out, changing the bind parameters to match IPv4 [1]. Previously, JGroups tried to bind to wrong interfaces, including `fe80::5003:8eff:fefa:3e53%tap0` exposed by Podman. Please have a look at the Pull Request [1], check if it works for you and let me know what you think about using TCP as default transport for JGroups. Thanks, Sebastian [1] https://github.com/jboss-dockerfiles/keycloak/pull/186