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Upgrading Buildbot from 2.4 to 3.2.0

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General Process

1. Stop puppet agent
2. Stop buildbot service
3. Backup /x1/buildmaster
   1. backups are labelled buildmaster-$buildbot_version-YYYYMMDDNN where NN is an incremented backup id starting with 01. 
4. Backup asfbuildbot2 mysql database as root
   1. Credentials may be found in /root/.my.cnf
   2. from /x1/; mysqldump -uroot -p --databases asfbuildbot2 > asfbuildbot-$version-YYYYMMDDnn.sql 
5. Edit https://github.com/apache/infrastructure-p6/blob/production/modules/buildbot_asf/manifests/init.pp
   1. Bump buildbot version
   in Puppet config and commit directly.change puppet to ensure service stopped
   2. Ensure requisite packages are being installed
   3. Ensure the buildmaster service is set to `ensure => stopped`.
6. Start puppet to pull in changes on buildmaster node
7. Stop puppet on buildmaster node
8. As buildmaster run 'buildbot --`buildbot upgrade-master .' master` in the /x1/buildmaster/master1' dir
9. Fix any configuration errors that occur (See note 1) and re-run the upgrade-master step until it completes successfully.
10. Start the Buildbot service.
11. Repeat 1 to 11 as needed for 2.5.10 to 3.0.3 (See note 2)Repeat 1 to 11 for multi step upgrades.
12. change puppet back to ensure service running
13. After a few days soak in, remove the local backups

2.4 to 3.2.0 Upgrade Notes

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As advised in Buildbot Documentation, we upgraded in steps.
From 2.4 to 2.5.10 to 3.0.3 and finally to 3.2.0

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Local backups were taken at the start and end of each upgrade.

(note 1) From 2.4 to 2.5.10 we had to fix builders to be a list. (pelican conf etc)
(note 2) From 2.5.10 to 3.0.3 we had to fix the mail notifiers.
(note 3) From 3.0.3 to 3.2.0 all went well with no configuration changes needed.