Job queue

Job queue runners run on the job-runners node group. Install a new job runner using the application::jobrunner class in puppet.

The daemon is controlled via /etc/init.d/mw-job-runner and will start on boot by default.

See also http://www.mediawiki.org/wiki/Manual:Job_queue

When there's an urgent call to kill job queues everywhere, i.e. when they're causing swapdeath and about to take down the site:
- on the job-runner group (see /home/config/others/usr/local/dsh/node_groups) . . .
- as root . . .
- pkill -9 -f obs (this matches jobs-loop and RunJobs and few others, we don't trap sinals in our php scripts so there's no need to kill gracefully)