Issue
-
Agent starting log contains this exception:
<===[JENKINS REMOTING CAPACITY]===>channel started Slave.jar version: 2.53.2 This is a Unix agent Evacuated stdout ERROR: Unexpected error in launching a agent. This is probably a bug in Jenkins. java.lang.NullPointerException at org.jenkinsci.main.modules.instance_identity.InstanceIdentity.getPublic(InstanceIdentity.java:118) at org.jenkinsci.modules.upstart_slave_installer.SlaveInstallerFactoryImpl.createIfApplicable(SlaveInstallerFactoryImpl.java:30) at org.jenkinsci.modules.slave_installer.SlaveInstallerFactory.createIfApplicable(SlaveInstallerFactory.java:29) at org.jenkinsci.modules.slave_installer.SlaveInstallerFactory.createFor(SlaveInstallerFactory.java:46) at org.jenkinsci.modules.slave_installer.impl.ComputerListenerImpl.onOnline(ComputerListenerImpl.java:30) at hudson.slaves.SlaveComputer.setChannel(SlaveComputer.java:558) at hudson.slaves.SlaveComputer.setChannel(SlaveComputer.java:366)
Resolution
This issue can happen when identity.key.enc
is corrupted, empty or deleted.
To resolve it, follow this procedure:
-
stop the Jenkins instance
-
on the Jenkins server, remove
$JENKINS_HOME/identity.key.enc
and$JENKINS_HOME/secrets/org.jenkinsci.main.modules.instance_identity.InstanceIdentity.KEY
files -
start the Jenkins instance
These files will be recreated automatically upon startup on recent Jenkins version. If it’s not the case, you can force that by running this Groovy script in Script Console:
def keyDecorator = new org.jenkinsci.main.modules.instance_identity.PageDecoratorImpl() jenkins.model.Jenkins.instance.getExtensionList(hudson.model.PageDecorator.class).add(keyDecorator)