Continuous integration/Jenkins

From MediaWiki.org
Jump to: navigation, search
Jenkins logo with title.svg

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 mediawiki/core.git repository.

There main repository for the layout of Jenkins itself is integration/jenkins.git (installed in /var/lib/jenkins on gallium).

The configuration of individual jobs is abstracted via Jenkins job builder. The jobs are triggered with Zuul (which abstracts Gerrit's events).

You can add new Jenkins slaves.

Services[edit | edit source]

These services run alongside on the Jenkins server as a result of certain jobs that publish results outside the Jenkins realm for other use:

Nightly snapshots[edit | edit source]

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).

Android applications[edit | edit source]

The WMF produces three Android application (WikipediaMobile, WLMMobile and WiktionaryMobile), hosted on GitHub. A pre commit hook notifies Jenkins whenever a change is submitted in GitHub. The ping back URL is https://integration.wikimedia.org/ci/github-webhook/. Jenkins will then fetch the branch the commit was made in and build the application.

Jenkins expects an ant script named build.xml in the root directory and will then execute ant debug. Once it completes a build, it copies the generated apk under /srv/org/mediawiki/integration/*Mobile to make it available publicly. For example, the WLMMobile application at https://integration.wikimedia.org/WLMMobile/nightly/ .

The mobile team is informed of build completion via an IRC bot idling in their irc channel irc://irc.freenode.net/#wikimedia-mobile

Installation[edit | edit source]

Automatic installation[edit | edit source]

curl https://raw.github.com/valhallasw/wikimedia-mkjenkins/master/mkjenkins.sh | bash

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!).

Manual installation[edit | edit source]

Restart[edit | edit source]

Jenkins init script is bugged and would not kill the process :-/

via Web interface[edit | edit source]

Apply the self-serve Jenkins repair!

a) Head to https://integration.wikimedia.org/ci/safeRestart b) Login with your labs account being part of the 'wmf' LDAP group c) press [Yes] d) in #wikimedia-operations : !log restarting stuck Jenkins

After a few minutes it should be back. Zuul will repool jobs automatically.

Hardcore way[edit | edit source]

On gallium.wikimedia.org find the pid of Jenkins (it is a java process) and kill -9 it.

Make sure it is gone.

/etc/init.d/jenkins start

After a few minutes it should be back. Zuul will repool jobs automatically.

'demon', 'krinkle', 'reedy', 'mholmquist' have the proper sudo rights. And ops of course :-]

Debugging[edit | edit source]

Start Jenkins with Java option:

-Dhudson.plugins.git.GitSCM.verbose="true"


Text thread dump: https://integration.wikimedia.org/ci/monitoring?part=threadsDump

See also[edit | edit source]