[keycloak-user] keycloak docker image clustering section is not working as expected

[Sebastian Laskawiec]

The JGROUPS_DISCOVERY_PROPERTIES is optional but some of the JGroups
Discovery protocols (including DNS_PING) require some additional
configuration. In case of DNS_PING, it's dns_query that needs to be
supplied. The absence of this parameter causes an exception in JGroups [1].

It is probably worth to mention that some of the Discovery protocols do not
require any properties. The most common examples could be KUBE_PING or
MPING.

[1]
https://github.com/belaban/JGroups/blob/master/src/org/jgroups/protocols/dns/DNS_PING.java#L63

On Mon, Oct 29, 2018 at 12:05 PM Meissa M'baye Sakho <msakho at redhat.com>
wrote:

> Hello everyone,
> There a confusing section in the clustering [1] section of the keycloak
> docker image.
> The documentation states that:
>
> *JGROUPS_DISCOVERY_PROPERTIES - an optional parameter with the discovery
> protocol properties in the following format:  *
> *PROP1=FOO,PROP2=BAR *
>
> I can confirm that this parameter is not optional at all.
> When I run the image  with the JGROUPS_DISCOVERY_PROTOCOL environnement
> variable set and without the JGROUPS_DISCOVERY_PROPERTIES set (since it's
> said to be optionnal), the container fails to start with the error message
> below:
> *10:50:11,999 ERROR [org.jboss.as.controller.management-operation]
> (Controller Boot Thread) WFLYCTL0013: Operation ("add") failed - address:
> ([*
> *    ("subsystem" => "jgroups"),*
> *    ("channel" => "ee")*
> *]) - failure description: {"WFLYCTL0080: Failed services" =>
> {"org.wildfly.clustering.jgroups.channel.ee
> <http://org.wildfly.clustering.jgroups.channel.ee>" =>
> "java.lang.IllegalArgumentException: dns_query can not be null or empty*
> *    Caused by: java.lang.IllegalArgumentException: dns_query can not be
> null or empty"}}*
>
> Setting the JGROUPS_DISCOVERY_PROPERTIES  environnement variable fix the
> error. So this is not an optional parameter.
> [1]=https://hub.docker.com/r/jboss/keycloak/
>
> Regards,
> Meissa
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