Issue

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

Environment

• CloudBees CI (CloudBees Core) on traditional platforms - Client controller (CORE-CM)
• CloudBees CI (CloudBees Core) on traditional platforms - Operations Center (CORE-OC)
• CloudBees Jenkins Platform - Client controller (CJP-CM)
• CloudBees Jenkins Platform - Operations Center (CJP-OC)
• CloudBees High Availability plugin (cloudbees-ha)

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.

Reference

How to add Java arguments to Jenkins?