db1132 (m3 - phabricator master) needs its kernel upgraded, let's failover it to a different host and move db1132 to m5 to failover that one too.
Floating host: db1107
[x] Reimage db1107
[x] Move db1107 to m3 as slave
Databases on m3: `phabricator`
When: Thursday 12th at 06:00 AM UTC
Failover process
OLD MASTER: db1132
NEW MASTER: db1107
[x] Check configuration differences between new and old master
`$ pt-config-diff h=db1107.eqiad.wmnet,F=/root/.my.cnf h=db1132.eqiad.wmnet,F=/root/.my.cnf `
[] Silence alerts on all hosts
[] Topology changes: move everything under db1107
`db-switchover --timeout=15 --only-slave-move db1132.eqiad.wmnet db1107.eqiad.wmnet`
[] Disable puppet db1107 and db1132
puppet agent --disable "switchover to db1107 T288197"
[] Merge gerrit: TBD
[] Run puppet on dbproxy1016 and dbproxy1020 and check the config
`puppet agent -tv && cat /etc/haproxy/conf.d/db-master.cfg`
[] Start the failover: `!log Failover m3 from db1132 to db1107 - T288197`
[] Set phabricator in RO:
```
ssh phab1001
sudo /srv/phab/phabricator/bin/config set cluster.read-only true
# restart database server
sudo /srv/phab/phabricator/bin/config set cluster.read-only false
```
[] DB switchover
`root@cumin1001:~/wmfmariadbpy/wmfmariadbpy# db-switchover --skip-slave-move db1132 db1107 `
[] Reload haproxies
```
dbproxy1016: systemctl reload haproxy && echo "show stat" | socat /run/haproxy/haproxy.sock stdio
dbproxy1020: systemctl reload haproxy && echo "show stat" | socat /run/haproxy/haproxy.sock stdio
```
[] kill connections on the old master (db1132)
` pt-kill --print --kill --victims all --match-all F=/dev/null,S=/run/mysqld/mysql.sock`
[] Restart puppet on old and new masters (for heartbeat):db1107 and db1132
`puppet agent --enable && puppet agent -tv`
[] Check services affected: phabricator
[] Clean orchestrator heartbeat to remove the old masters' one, otherwise Orchestrator will show lag
[] Close this ticket and create a ticket to failover m5