Jenkins is a Java tool used to handle recurring tasks such as running tests or building packages. Our primary install is at https://integration.wikimedia.org/ci/.
The tool is permanently connected to our review tool (Gerrit) and can be made to react on changes submitted to Gerrit. A typical example, is running MediaWiki unit tests whenever a change is submitted to the
The main repository for the layout of Jenkins itself is
integration/jenkins.git (installed in
You can add new Jenkins slaves.
These services run alongside on the Jenkins server as a result of certain jobs that publish results outside the Jenkins realm for other uses:
They are being generated at 3am UTC via the Jenkins job "Nightly - MediaWiki core". The ant target is
nightly-mediawiki-core and is really straightforward : it get the latest version of master and uses
git-archive to generate a zip file. It is then copied under
/org/mediawiki/integration/nightly hierarchy which is publicly available via https://integration.wikimedia.org/nightly/.
The latest snapshot is always available at https://integration.wikimedia.org/nightly/mediawiki/core/mediawiki-latest.zip (it is a symbolic link to the latest snapshot).
Wikipedia Android alpha app builds
The mobile apps team uses Jenkins to build its alpha release of the Wikipedia app, available at http://android-builds.wmflabs.org/. Each time a change to /apps/android/wikipedia is merged in Gerrit, an apps-android-wikipedia-publish job is triggered in Jenkins. Upon successful completion, the resulting APK and a JSON file containing the build timestamp are preserved as build outputs.
Every 15 minutes, a script invoked by a cron job running on the
android-builder instance in Wikimedia Cloud VPS checks for a new APK in the job outputs, and publishes it at the above web site if found.
For more info, see Wikimedia_Apps/Team/Android/App_hacking/Alpha_build_server.
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To make the install go faster, it helps to have a mediawiki-core checkout in ~/src/mediawiki-core - if this repository exists, it will make a local clone. If it doesn't, it will download from gerrit instead (slow!).
git clone https://gerrit.wikimedia.org/r/p/integration/jenkins.git ~/.jenkins
~/.jenkinsis the default jenkins configuration directory
- WM-specific configuration patch I -
ln -s $HOME/.jenkins /var/lib/jenkins
- because some jobs assume jenkins is installed in
- because some jobs assume jenkins is installed in
- Download jenkins and place it in ~/.jenkins
- install the following plugins (download into
- Download jenkins-job-builder and its configuration ‒ see Continuous_integration/Jenkins job builder for more information. You don't need a password when you install Jenkins locally.
- WM-specific configuration patch II - Patch the JBB configuration that depends on Zuul (see the mkjenkins script for a diff)
- If you already have a checkout of mediawiki-core:
git clone --mirror -l -- your_existing_checkout /var/lib/jenkins/git/mw-core-bare. Otherwise,
git clone --mirror -- https://gerrit.wikimedia.org/r/p/mediawiki/core.git /var/lib/jenkins/git/mw-core-bare
- Start Jenkins:
cd ~/.jenkins && java -jar jenkins.war&
- When Jenkins is running, install the JBB jobs:
rm -f $HOME/.cache/jenkins_jobs/jenkins_jobs_cache.yml && jenkins-jobs --conf jenkins_jobs.ini update config/.
Hung beta code/db update
This deadlock seems to happen more often than not following or during a database update that is taking a while to complete.
- Take deployment-tin offline in Jenkins https://integration.wikimedia.org/ci/computer/deployment-tin.eqiad/markOffline
- Kill any jenkins jobs running on deployment-tin via Jenkins UI
- Kill all pending jobs in the Jenkins queue that are "waiting on executors"
- Disconnect deployment-tin https://integration.wikimedia.org/ci/computer/deployment-tin.eqiad/disconnect
- Bring deployment-tin back online (button labeled "Bring this node back online")
- Launch slave agent (there's a button that says this)
- Check agent log to see that it connected https://integration.wikimedia.org/ci/computer/deployment-tin.eqiad/log
Sometimes you have to do this whole dance several times before Jenkins realizes that the there are a bunch of executors that it can use.
- Go to https://integration.wikimedia.org/ci/manage
- Go to "Configure System"
- Search page for "Enable Gearman"
- Un-check the checkbox
- Wait 30s
- Check the "Enable Gearman" checkbox
This second method may interrupt communication between running Jenkins jobs and Zuul but it seems to work even when the offline/online method fails to clear the deadlock.
init.dscript for Jenkins is broken (unable to find the PID, T53817).
Zuul should not be restarted. Zuul preserves the queue and continues after the restart.
Via web interface
Apply the self-serve Jenkins repair!
safeRestart any currently running jobs will block a restart until they are canceled. Any long running jobs should be killed. Check for jobs on the main jenkins dashboard, cancel any long-running jobs there. Bonus points: make a note of the patches for which you have canceled jobs on the zuul dashboard, comment "recheck" for any patches in the test queue that you have aborted.
- Head to https://integration.wikimedia.org/ci/safeRestart
- Login with your labs account being part of the 'wmf' LDAP group
- press "Yes"
- in : "!log restarting stuck Jenkins".
On contint1001.wikimedia.org, find the PID of Jenkins (it is a java process) and
sudo -u jenkins kill -9 .. it.
Ensure the process is gone (grep through
$ sudo /etc/init.d/jenkins start
'demon', 'krinkle', 'reedy', 'mholmquist' have the proper sudo rights. And ops of course :-]
Whenever Jenkins appears to be stuck or facing high CPU usage, you will want to look at the Java threads: https://integration.wikimedia.org/ci/threadDump
This is the way to do it from the CLI
jstack -l -F <pid of jenkins>
Last time this happened (2017-05-20) a restart of Jenkins "fixed" the problem, but we were unable to troubleshoot without a stacktrace from
Start Jenkins with Java option:
Text thread dump: https://integration.wikimedia.org/ci/monitoring?part=threadsDump