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* Install Ubuntu | * Install Ubuntu | ||
* Install wikimedia-task-appserver | * Install wikimedia-task-appserver | ||
| − | * Add the hostname to <tt>/usr/local/dsh/node_groups/mediawiki-installation</tt> on the ssh bastion host ([[ | + | * Add the hostname to <tt>/usr/local/dsh/node_groups/mediawiki-installation</tt> on the ssh bastion host ([[fenari]]) |
'''Additionally, for a non-apache batch server:''' | '''Additionally, for a non-apache batch server:''' | ||
* Stop apache: <tt>/etc/init.d/apache2 stop</tt> | * Stop apache: <tt>/etc/init.d/apache2 stop</tt> | ||
| − | * Disable apache by running update-rc.d -f apache2 remove | + | * Disable apache by running <tt>update-rc.d -f apache2 remove</tt> |
* Add to ganglia with: | * Add to ganglia with: | ||
| Line 27: | Line 27: | ||
<pre> | <pre> | ||
| − | apt-get install gmond ganglia-metrics | + | apt-get -y --no-remove install gmond ganglia-metrics |
cp -r /home/wikipedia/conf/gmond /etc | cp -r /home/wikipedia/conf/gmond /etc | ||
rm /etc/gmond.conf | rm /etc/gmond.conf | ||
| Line 46: | Line 46: | ||
* Apache not in apaches node group: apache-restart-all etc. fails, unmonitored in nagios. | * Apache not in apaches node group: apache-restart-all etc. fails, unmonitored in nagios. | ||
* Server not in ganglia: by the time you realise you need it, you will have missed hours or days of important performance data. | * Server not in ganglia: by the time you realise you need it, you will have missed hours or days of important performance data. | ||
| + | * Running <tt>apt-get -y</tt> unattended without the <tt>--no-remove</tt> option: due to some subtle error in the repository or sources.list, apt-get declares your entire installation "conflicting", right down to glibc, and removes it, bricking the server. | ||
* Apache not in nagios: Tim gets upset. | * Apache not in nagios: Tim gets upset. | ||
| + | [[Category: How-To]] | ||
Latest revision as of 22:23, 27 September 2011
For any MediaWiki installation:
- Install Ubuntu
- Install wikimedia-task-appserver
- Add the hostname to /usr/local/dsh/node_groups/mediawiki-installation on the ssh bastion host (fenari)
Additionally, for a non-apache batch server:
- Stop apache: /etc/init.d/apache2 stop
- Disable apache by running update-rc.d -f apache2 remove
- Add to ganglia with:
apt-get -y --no-remove install gmond ganglia-metrics cp -r /home/wikipedia/conf/gmond /etc rm /etc/gmond.conf ln -s gmond/misc.conf /etc/gmond.conf /etc/init.d/gmond restart /etc/init.d/gmetricd restart
Additionally, for a main pool apache server:
- Add the hostname to /usr/local/dsh/node_groups/apaches
- Add to nagios with cd /home/wikipedia/conf/nagios && ./sync
- Add to ganglia with:
apt-get -y --no-remove install gmond ganglia-metrics cp -r /home/wikipedia/conf/gmond /etc rm /etc/gmond.conf /home/wikipedia/conf/gmond/make-apache-symlink /etc/init.d/gmond restart /etc/init.d/gmetricd restart
- Add the server to /etc/pybal/apache on the LVS director for the apaches, currently lvs3. The weight should be proportional to the CPU count.
[edit] List of things that will break if you try to install MediaWiki without following this procedure
- Not in mediawiki-installation node group: server doesn't get sync-file/scap updates, so misses out on DB server and similar changes. Thus it goes rogue and destroys the cluster.
- No wikimedia-nis-client: non-roots can't sync. Server misses out on updates, goes rogue.
- No sudoers (from wikimedia-task-appserver): non-roots can't sync.
- No upload NFS mounts (from wikimedia-task-appserver): MediaWiki will spew errors when it tries to access uploads, corrupting your data and potentially corrupting the shared caches.
- No latex, djvulibre, ploticus, etc. (from wikimedia-task-appserver): Bad output, corrupted caches.
- Apache not in apaches node group: apache-restart-all etc. fails, unmonitored in nagios.
- Server not in ganglia: by the time you realise you need it, you will have missed hours or days of important performance data.
- Running apt-get -y unattended without the --no-remove option: due to some subtle error in the repository or sources.list, apt-get declares your entire installation "conflicting", right down to glibc, and removes it, bricking the server.
- Apache not in nagios: Tim gets upset.
