[Jenkins-infra] Confluence migration planning

[Kohsuke Kawaguchi]

I've successfully run the confluence container on lettuce (albeit with
temporary throw-away database), so now it's time to plan for the actual
migration.

My current goal is to get this migration done in the next weekend. Here's
the step-by-step description of what I think I'm going to do. Your review
is appreciated.

   - Disable puppet run on eggplant by manually commenting out puppet run
   with "crontab -e"
   - Switch http://wiki.jenkins-ci.org/ to maintenance by having
   /etc/apache2/sites-enabled/wiki.jenkins-ci.org to
   /etc/apache2/sites-available/wiki.jenkins-ci.org.maintenance. This blocks
   traffic from getting to Confluence
   - Verify from my local browser that http://wiki.jenkins-ci.org/ is
   showing maintenance screen
   - Shutdown Confluence via kill ("/etc/init.d/confluence shutdown" never
   work)
   - Take full backup of confluence DB dump & home
   - Disable puppet agent on lettuce by "puppet agent --disable"
   - Stop all docker container services on lettuce (wikidb, confluence, and
   confluence-cache)
   - Wipe out /srv/wiki/home on lettuce, rsync /srv/wiki/home from eggplant
   to lettuce.
   - adjust file permissions on the lettuce's new wiki home (chown -R
   1000:1001 /srv/wiki/home)
   - merge PR #90 <https://github.com/jenkins-infra/jenkins-infra/pull/90>
   to production. This change shuts down temporary mariadb for testing, and
   switch Confluence to talk to the production DB
   - Re-enable puppet agent on lettuce by "puppet agent --enable"
   - Manually run "puppet agent -t" on lettuce to get Confluence going
   - Manually sanity check Confluence on lettuce by using browser and
   looking around, making edits
   - "service docker-confluence restart" on lettuce and make sure it comes
   back up all right
   - merge PR #91 <https://github.com/jenkins-infra/jenkins-infra/pull/91>
   to make lettuce production. "puppet agent -t" manually on edamame and
   spinach to speed up the propagation of DNS change
   - merge PR #71 <https://github.com/jenkinsci/infra-puppet/pull/71> to
   make sure eggplant won't run Confluence.
   - Enable puppet run on eggplant by editing "crontab -e". run
   /root/infra-puppet/run.sh immediately and manully inspect the result. In
   particular, make sure confluence won't run on eggplant.
   - Update datadog dashboard so that it picks up metrics from lettuce.
   tweak monitoring.

Any other things we can do to reduce the risk of migration?


-- 
Kohsuke Kawaguchi
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