Spawning process in background on Jenkins - job that won't stay in queue

Question

I want to make job on Jenkins that starts server (MockServer on WireMock).

Server is launched from *.jar file, from terminal like that.

java -jar serverLaunch.jar

It takes over my console. To avoid that I modify this and do:

java -jar serverLaunch.jar &>/dev/null &

And that works for me on my local PC. Now I want to move it to Jenkins.

If I try to do this from "Shell command" block in Jenkins Job then:

a) java -jar serverLaunch.jar

• I have task locked in queue in my Jenkins and I don't want that but server starts and works.

b) java -jar serverLaunch.jar &>/dev/null &

• Job ends with success but my server is not alive.

I have wrapped this command also in .sh script and .rb script. Any idea how to make it work?

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I've tried this: https://wiki.jenkins-ci.org/display/JENKINS/Spawning+processes+from+build

And then in Jenkins "Shell script":

daemonize -E BUILD_ID=dontKillMe /bin/bash launch.sh

But it also passes but server is not alive.

Answer 1

Another effective approach would be to add a post-build action that executes a shell spawning the server.

Answer 2

I had to check "Inject environment variables to the build process" and add:

BUILD_ID=dontKillMe

Now it is working.

Answer 3

Try using nohup e.g.: nohup java -jar serverLaunch.jar &

That should prevent the process being terminated when the parent shell process exits (which I suspect is your problem).