Installing multiple Jenkins instances on same Windows machine caused issues

Question

I recently saw a blog, which suggested two instances of Jenkins can run on same Windows machine: Two Guys Arguing, Pro Tips: Run Multiple Jenkins CI Servers on a Single Machine.

But rather than deploying the jenkins.war, I actually installed another Jenkins on top of already installed Jenkins on my Windows machine, Which caused the previous Jenkins to stop.

Answer 1

I made the mistake of installing Jenkins using standard Windows installation, instead of deploying the war like:

java -DJENKINS_HOME=/path/to/configs -jar jenkins.war --httpPort=9090

which caused a change in Jenkins service's Path to executable. (Because during the 2nd Jenkins installation, I had chosen a different JENKINS_HOME_1 path.)

To make another mistake, I tried to uninstall this second installation, but Windows Jenkins service was still having exe path as JENKINS_HOME_1 (former C:/Jenkins/jenkins.exe).

To come out of this I had to change this Path to executable via:

• Command line:

  sc config Jenkins binPath="C:\Program Files (x86)\Jenkins\jenkins.exe"
  

or

• Registry change:

  HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Jenkins\ImagePath="C:\Program Files (x86)\Jenkins\jenkins.exe"
  

I will try the java -jar jenkins options again though.