Content translation/Deployments/How-to

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This document describes deployment procedure for ContentTranslation, cxserver and Apertium.

ContentTranslation[edit]

Content Translation is updated via regular MediaWiki train. In case of manual update needed, follow the steps below.

  1. Update desired branches to desired commit/update using delete and create branches at Gerrit interface, https://gerrit.wikimedia.org/r/#/admin/projects/mediawiki/extensions/ContentTranslation,branches In case of emergency, note down old hash.
  2. Read and follow: https://wikitech.wikimedia.org/wiki/How_to_deploy_code#Updating_the_submodule Make sure you've clean copy of MediaWiki/core for this.
  3. You're ready for actual deployment.

cxserver[edit]

Testing[edit]

Note image tag version from Gerrit patchset to be deploy. For eg: https://gerrit.wikimedia.org/r/#/c/mediawiki/services/cxserver/+/502964/ has 2019-04-11-112002-production tag.

Run it:

docker run -p 4000:8080 docker-registry.wikimedia.org/wikimedia/mediawiki-services-cxserver:2019-04-11-112002-production --it --entrypoint /bin/bash -c config.dev.yaml

Where, config.dev.yaml is local cxserver config file.

Endpoints can be tested at: http://localhost:4000/v2 etc

Deployment[edit]

  1. Clone deployment-charts repository (for first time).
  2. Modify helmfile.d folder of the service: deployment-charts/helmfile.d/services/staging/cxserver. We mostly need change in values.yaml file for cxserver update. When updating cxserver version, look at, version: and update it to patch that need to deploy.
  3. Make a CR (Example: https://gerrit.wikimedia.org/r/#/c/528618/) and after a successful review, merge it.
  4. After merge, log in in a deployment server, there is a cron (1 minute) that will update the /srv/deployment-charts directory with the contents from git.
  5. Go to /srv/deployment-charts/helmfile.d/services/${CLUSTER}/cxserver where CLUSTER is one of (staging, eqiad, codfw).
  6. Execute: source .hfenv; helmfile diff This will show the changes that it will be applied on the cluster.
  7. Execute: source .hfenv; helmfile apply This will materialize the previous diff in the cluster and also will log into SAL the change.

Secrets[edit]

If secrets like API key or token need update, it need to be done via SRE at Private Puppet repository.

Status[edit]

This is done using helmfile:

  1. Change directory to /srv/deployment-charts/helmfile.d/services/${CLUSTER}/cxserver on a deployment server
  2. Unless you are mid un-applied changes the current values files should reflect the deployed values
  3. You can check for un-applied changes with: source .hfenv; helmfile diff
  4. You can see the status with source .hfenv; helmfile status

Rolling back changes[edit]

If you need to roll back a change because something went wrong:

  1. Revert the git commit to the deployment-charts repo
  2. Merge the revert (with review if needed)
  3. Wait one minute for the cron job to pull the change to the deployment server
  4. Change directory to /srv/deployment-charts/helmfile.d/services/${CLUSTER}/cxserver where CLUSTER is one of (staging, eqiad, codfw).
  5. Execute source .hfenv; helmfile diff to see what you'll be changing.
  6. Execute source .hfenv; helmfile apply

See also[edit]

Apertium[edit]

Apertium deployment is done via updating apertium packages through Gerrit change and puppet.

Troubleshooting[edit]

  1. Check if package list are up-to-date in Puppet.
  2. Make sure to ask to restart 'apertium-apy' on scb1001 and scb1002 to any Ops member after adding new languages support for Apertium MT.
  3. Check logs at: /srv/logs/apertium/

See also[edit]

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