How to disable High Availability (active/passive) in CloudBees CI?

Issue

How to correctly disable High Availability (active/passive)?
Why is HA still running even after I have uninstalled the CloudBees High Availability (active/passive) Management plugin (cloudbees-ha)?

Environment

Resolution

Option 1: Pass the following Java argument to Jenkins:

-Dcom.cloudbees.jenkins.ha=false

Option 2: Use the environment variable:

JENKINS_HA=false

and then restart Jenkins.

Note: If you are running client controller or operations center using a Docker compose file, you will need to follow Option 2. A sample layout for that file would be:

...
services:
  jenkins:
    image: cloudbees/cloudbees-core-cm:VERSION
    restart: unless-stopped
    ports:
     - 8080:8080
     - 50000:50000
    environment:
     -  JENKINS_HA=false
    container_name: jenkins
    volumes:
...

Cleanup

If you are disabling permanently and would also like to remove the no longer used working files, you need to delete a directory specified in the HA_JGROUPS_DIR Java System Property which defaults to $JENKINS_HOME/jgroups. Advanced tuning is available via the $JENKINS_HOME/jgroups.xml file, so it can also be removed if it is present.

Reference

How to add Java arguments to Jenkins?

This article is part of our Knowledge Base and is provided for guidance-based purposes only. The solutions or workarounds described here are not officially supported by CloudBees and may not be applicable in all environments. Use at your own discretion, and test changes in a safe environment before applying them to production systems.