Unable to add a new server in a server-group of older EAP 7 host controller managed by a newer EAP 7 Domain Controller

Solution Verified - Updated

Environment

  • Red Hat JBoss Enterprise Application Platform (EAP)
    • 7
  • Configure a JBoss EAP 7.3 Domain Controller to Administer JBoss EAP 7.2 (or earlier) Instances (as per documentation)
  • Trying to add a new server in a server-group of older EAP 7 host controller that is managed by a newer EAP 7 Domain Controller

Issue

This does not work on using JBoss CLI (or Admin Console GUI) to add the new server, I'm always getting this error:

[domain@xx.xx.xx.xx:9990 /] /host=SlaveEAP71/server-config=SlaveJvm-EAP71:add(group=ServerGroup-eap71)
{
 "outcome" => "failed",
 "result" => {},
 "failure-description" => {"host-failure-descriptions" => {"SlaveEAP71" => "WFLYHC0201: Error synchronizing the host model with the domain controller model with failure : WFLYDC0075: Cannot synchronize the model due to missing extensions: [org.wildfly.extension.microprofile.opentracing-smallrye, org.wildfly.extension.microprofile.config-smallrye, org.wildfly.extension.ee-security]."}},
 "rolled-back" => true
}

[domain@xx.xx.xx.xx:9990 /]

Resolution

This is a bug and it will be addressed in a next EAP 7.3.z patch release (refer to Root Cause section for more).

For now, a workaround is to manually edit your host*.xml file and add the new server under the servers section:

<host name="SlaveEAP71" xmlns="urn:jboss:domain:5.0">
...
    <servers>
        <server name="SlaveJvm-EAP71" group="ServerGroup-eap71"/>
    </servers>
...
</host>

Then, start your host controller as usual.

After adding at least one server manually in your host*.xml as above, you will be able to use the JBoss CLI (or Admin Console) operation to add more servers:

[domain@xx.xx.xx.xx:9990 /] /host=SlaveEAP71/server-config=SlaveJvm-EAP72:add(group=ServerGroup-eap71)
{
    "outcome" => "success",
    "result" => undefined,
    "server-groups" => undefined
}

Root Cause

You cannot add a new server to your EAP 7.2 (or earlier 7.x) server group via CLI command (or Admin Console GUI), if there is no server already added. This is a bug:

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