Wildfly Embedded Artemis in K8s - UnknownHostException

Question

I'm attempting to run Wildfly 26 in K8s. When the second pod comes up it's getting an error:

2024-04-05 13:07:58,239 WARN  [org.apache.activemq.artemis.core.server] (Thread-3 (ActiveMQ-server-org.apache.activemq.artemis.core.server.impl.ActiveMQServerImpl$6@4b262fe0)) AMQ224091: Bridge ClusterConnectionBridge@44dbdfc2 [name=$.artemis.internal.sf.my-cluster.c06524ea-f36e-11ee-95d7-4ef5e9f861e4, queue=QueueImpl[name=$.artemis.internal.sf.my-cluster.c06524ea-f36e-11ee-95d7-4ef5e9f861e4, postOffice=PostOfficeImpl [server=ActiveMQServerImpl::name=default], temp=false]@7e873458 targetConnector=ServerLocatorImpl (identity=(Cluster-connection-bridge::ClusterConnectionBridge@44dbdfc2 [name=$.artemis.internal.sf.my-cluster.c06524ea-f36e-11ee-95d7-4ef5e9f861e4, queue=QueueImpl[name=$.artemis.internal.sf.my-cluster.c06524ea-f36e-11ee-95d7-4ef5e9f861e4, postOffice=PostOfficeImpl [server=ActiveMQServerImpl::name=default], temp=false]@7e873458 targetConnector=ServerLocatorImpl [initialConnectors=[TransportConfiguration(name=http-connector, factory=org-apache-activemq-artemis-core-remoting-impl-netty-NettyConnectorFactory) ?httpUpgradeEndpoint=http-acceptor&activemqServerName=default&httpUpgradeEnabled=true&port=8080&host=msg-email-jay-test-0], discoveryGroupConfiguration=null]]::ClusterConnectionImpl@2015267711[nodeUUID=e793336e-f36e-11ee-82cb-9ed7cde89c14, connector=TransportConfiguration(name=http-connector, factory=org-apache-activemq-artemis-core-remoting-impl-netty-NettyConnectorFactory) ?httpUpgradeEndpoint=http-acceptor&activemqServerName=default&httpUpgradeEnabled=true&port=8080&host=msg-email-jay-test-1, address=jms, server=ActiveMQServerImpl::name=default])) [initialConnectors=[TransportConfiguration(name=http-connector, factory=org-apache-activemq-artemis-core-remoting-impl-netty-NettyConnectorFactory) ?httpUpgradeEndpoint=http-acceptor&activemqServerName=default&httpUpgradeEnabled=true&port=8080&host=msg-email-jay-test-0], discoveryGroupConfiguration=null]] is unable to connect to destination. Retrying
2024-04-05 13:07:58,723 ERROR [org.apache.activemq.artemis.core.client] (Thread-0 (ActiveMQ-server-org.apache.activemq.artemis.core.server.impl.ActiveMQServerImpl$6@4b262fe0)) AMQ214016: Failed to create netty connection: java.net.UnknownHostException: msg-email-jay-test-0

My messaging-activemq configuration is the default from standalone-ha.xml

<subsystem xmlns="urn:jboss:domain:messaging-activemq:13.1">
    <server name="default">
        <security elytron-domain="ApplicationDomain"/>
        <cluster password="${jboss.messaging.cluster.password:CHANGE ME!!}"/>
        <security-setting name="#">
            <role name="guest" send="true" consume="true" create-non-durable-queue="true" delete-non-durable-queue="true"/>
        </security-setting>
        <address-setting name="#"
                         dead-letter-address="jms.queue.DLQ"
                         max-delivery-attempts="${jboss.messaging.redelivery.maxAttempts:800}"
                         redelivery-delay="${jboss.messaging.redelivery.delay.initialMillis:500}"
                         max-redelivery-delay="${jboss.messaging.redelivery.delay.maxMillis:5000}"
                         redelivery-multiplier="${jboss.messaging.redelivery.delay.multiplier:2}"
                         max-size-bytes="10485760"
                         page-size-bytes="2097152"
                         message-counter-history-day-limit="10"
                         redistribution-delay="1000"/>
        <http-connector name="http-connector" socket-binding="http" endpoint="http-acceptor"/>
        <http-connector name="http-connector-throughput" socket-binding="http" endpoint="http-acceptor-throughput">
            <param name="batch-delay" value="50"/>
        </http-connector>
        <in-vm-connector name="in-vm" server-id="0">
            <param name="buffer-pooling" value="false"/>
        </in-vm-connector>
        <http-acceptor name="http-acceptor" http-listener="default"/>
        <http-acceptor name="http-acceptor-throughput" http-listener="default">
            <param name="batch-delay" value="50"/>
            <param name="direct-deliver" value="false"/>
        </http-acceptor>
        <in-vm-acceptor name="in-vm" server-id="0">
            <param name="buffer-pooling" value="false"/>
        </in-vm-acceptor>
        <jgroups-broadcast-group name="bg-group1" jgroups-channel="activemq-cluster" connectors="http-connector"/>
        <jgroups-discovery-group name="dg-group1" jgroups-channel="activemq-cluster"/>
        <cluster-connection name="my-cluster" address="jms" connector-name="http-connector" discovery-group="dg-group1"/>
        <jms-queue name="DLQ" entries="java:/jms/queue/DLQ"/>
        <connection-factory name="InVmConnectionFactory" entries="java:/ConnectionFactory" connectors="in-vm" consumer-window-size="${jboss.messaging.consumer.buffer.bytes:0}"/>
        <connection-factory name="RemoteConnectionFactory" entries="java:jboss/exported/jms/RemoteConnectionFactory" connectors="http-connector" ha="true" block-on-acknowledge="true" reconnect-attempts="-1" consumer-window-size="${jboss.messaging.consumer.buffer.bytes:0}"/>
        <pooled-connection-factory name="activemq-ra" entries="java:/JmsXA java:jboss/DefaultJMSConnectionFactory" connectors="in-vm" transaction="xa"/>
    </server>
</subsystem>

and my jgroup is setup for DNS_PING

<subsystem xmlns="urn:jboss:domain:jgroups:8.0">
    <channels default="ee">
        <channel name="ee" stack="tcp" cluster="ejb"/>
    </channels>
    <stacks>
        <stack name="tcp">
            <transport type="TCP" socket-binding="jgroups-tcp"/>
            <protocol type="dns.DNS_PING">
                <property name="dns_query">${rave.messaging.cluster.dns.query}</property>
            </protocol>
            <protocol type="MERGE3"/>
            <protocol type="FD_SOCK"/>
            <protocol type="FD_ALL"/>
            <protocol type="VERIFY_SUSPECT"/>
            <protocol type="pbcast.NAKACK2"/>
            <protocol type="UNICAST3"/>
            <protocol type="pbcast.STABLE"/>
            <protocol type="pbcast.GMS"/>
            <protocol type="MFC"/>
            <protocol type="FRAG2"/>
        </stack>
    </stacks>
</subsystem>

msg-email-jay-test-0 is the name of the other (original) Pod, but I would expect any name lookup to include the governing service domain e.g. $(podname).$(governing service domain)

As is I don't know where the host name is coming from.