mw-experimental

This page documents the new Kubernetes way providing the same functionality as Mwdebug. The mwdebug* hosts will be going away soon.

Please check task T276994 for more info.

mw-experimental is a MediaWiki On Kubernetes deployment in WikiKube, for Ad-hoc testing via WikimediaDebug.

Design

mw-experimental is yet another mediawiki deployment, with some twists. Each DC runs one mw-experimental pod on a dedicated wikikube-worker node, which mounts the mediawiki code from the host's /srv/mediawiki directory, rather than the code found in the mediawiki container. This deployment runs mediawiki-multiversion-debug images.

Using the service

Make sure mw-experimental is deployed and up to date:

deploy1003:$ cd /srv/deployment-charts/helmfile.d/services/mw-experimental
deploy1003:$ helmfile -e eqiad -i apply

or 

deploy1003:$ helmfile -e codfw -i apply

SSH to mw-experimental.eqiad.wmnet or mw-experimental.codfw.wmnet
There is timer updating /srv/mediawiki every hour. You can check when it last ran:
```
systemctl status mw-experimental-mediawiki-image-update.timer
```

Despite this, if you want to update it again, you may run the timer on demand (takes ~3mins):

wikikube-worker-exp1001:~$ sudo systemctl restart mw-experimental-mediawiki-image-update.service

Make your changes in /srv/mediawiki as usual. Files are editable as any user in the deployment group; changes to PHP files should take effect immediately (no need to restart php-fpm or anything like that).
Go to XWD and choose k8s-mw-experimental-eqiad or k8s-mw-experimental-codfw

Notes:

We have a timer updating /srv/mediawiki every hour

To prevent code refreshing, you may run

wikikube-worker-exp1001:~$ /usr/local/sbin/mw-experimental-mediawiki-image-update --lock
 
wikikube-worker-exp1001:~$ /usr/local/sbin/mw-experimental-mediawiki-image-update --unlock

If you would like to discard your changes quickly and start over, you don't need to run helmfile again, unless some breaking changes have been deployed in the meantime. Restarting mw-experimental-mediawiki-image-update.service should be enough.
Image versions used on mw-experimental can be found either on the experimental hosts themselves or the deployment server under /etc/helmfile-defaults/mediawiki/release/mw-experimental-pinkllama.yaml

Dashboards

Same url as before on logstash
mw-experimental on grafana