In my case:
That sets the JENKINS_HOME to the new Jenkins location.
3. In the same Terminal console, enter:
java -jar jenkins.war --httpPort=8083
Take into account that the port number must be different than the one you used in the original Jenkins instance. By default, that port is 8080, so you can use any other number.
4. Leave the console open and open a browser. There, enter the server IP number followed by the port you chose. And there you have it! Another instance of Jenkins already running.
When I first did this I noticed that there is a problem when launching a slave machine through Java Web Start. There is a dialog with this message:
Unable to launch the application
In order to solve this problem, I recommend you to take the following steps:
1. Go to Manage Jenkins>System Configuration>Jenkins Location
2. In Jenkins Location, enter the IP number of the machine where Jenkins is installed and the port you are currently using. Then click on Save.