Jenkins does not start on macOS 10.12 (Sierra)

Question

After upgrading my macOS to Sierra, when I start Jenkins using launchctl load I cannot connect to localhost:8080. If I call launchctl load again, I see response \"service alread

Answer 1

This same thing happened to me when I upgraded from Sierra to High Sierra. I followed the instructions outlined above by mac.slusarek, however the jenkins ID no longer existed on my computer. I created the jenkins id as a Standard user. Also, the files under /Users/Shared/Jenkins were no longer owned by jenkins. After I cat out the error log with the command:

sudo cat /var/log/jenkins/jenkins.log

After seeing the error:

Exception in thread "main" java.io.IOException: Jenkins has failed to create a 
temporary file in /Users/Shared/Jenkins/tmp
    at Main.extractFromJar(Main.java:368)
    at Main._main(Main.java:210)
    at Main.main(Main.java:112)
 Caused by: java.io.IOException: Permission denied
    at java.io.UnixFileSystem.createFileExclusively(Native Method)
    at java.io.File.createTempFile(File.java:2024)
    at Main.extractFromJar(Main.java:365)
    ... 2 more

I fixed the ownership with the command:

sudo chown -R jenkins /Users/Shared/Jenkins