Jenkins failed to start in linux
jenkins, linux, ubuntu
Solution
So, knowing it was a pre-start error allowed me to investigate more deeply.
Further digging allowed me to figure out that the exact line in the `/etc/init/jenkins.conf` file was one pointing to the `/usr/share/jenkins/bin/maintain-plugins.sh`
Looking at this location, I found it was not present (ie. no bin directory). This means that `jenkins-common` was no longer installed for some reason...odd indeed...going into `apt-get` and doing an install of this component again led to the error:
dpkg error processing /var/cache/apt/archives/jenkins-common_1.409.1-0ubuntu4.2_all.deb ...
having seen this error before and refreshing my memory via google gave the following solution:
dpkg -i --force-overwrite /var/cache/apt/archives/jenkins-common_1.409.1-0ubuntu4.2_all.deb
This allowed the installation of common to proceed as normal. After this, all I had to do was replace the `/usr/share/jenkins/jenkins.war` with my backed up copy (because ubuntu is far behind the latest release version), and I was able to start the server again.
I am not exactly sure what caused the problem to begin with, but it was likely during an apt-get upgrade/clean process...and because of the weirdness with jenkins conflicting with jenkins-common, it did not repopulate the `/usr/share/jenkins` directory properly.
regardless, am glad it is working again. :)
Problem
go to run jenkins after doing an upgrade, and get the following: ``` start jenkins start: Job failed to start ``` That's it...nothing shows up in jenkin's log...so it is difficult to debug to say the least. (and it isn't running already, or anything like that). Is there another log somewhere that I should be looking at that would be helpful? (I am assuming answer to this problem will be somewhat iterative, so hopefully someone can start me on a path to debug this)