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Before we deploy this commit, we must migrate the data from the staging redis server to the new, dedicated redis server. The steps for doing so are the following: * Remove the zulip::redis puppet class from staging's zulip.conf * ssh once from staging to redis-staging.zulip.net so that the host key is known * Create a tunnel from redis0.zulip.net to staging.zulip.net * zulip@redis0:~$ ssh -N -L 127.0.0.1:6380:127.0.0.1:6379 -o ServerAliveInterval=30 -o ServerAliveCountMax=3 staging.zulip.net * Set the redis instance on redis0.zulip.net to replicate the one on staging.zulip.net * redis 127.0.0.1:6379> slaveof 127.0.0.1 6380 * Stop the app on staging * Stop redis-server on staging * Promote the redis server on redis0.zulip.net to a master * redis 127.0.0.1:6379> slaveof no one * Do a puppet apply at this commit on staging (this will bring up the tunnel to redis0) * Deploy this commit to staging (start the app on staging) * Kill the tunnel from redis0.zulip.net to staging.zulip.net * Uninstall redis-server on staging The steps for migrating prod will be the same modulo s/staging/prod0/. (imported from commit 546d258883ac299d65e896710edd0974b6bd60f8)