Databases on m5:
```
labsdbaccounts
mailman3
mailman3web
striker
test_labsdbaccounts
toolhub
```
When: Thursday 9th at 16:00 UTC
**Impact: Writes will be disabled for around 1 minute.**
Failover process
OLD MASTER: db1183
NEW MASTER: db1176
[x] Check configuration differences between new and old master
`$ pt-config-diff h=db1176.eqiad.wmnet,F=/root/.my.cnf h=db1183.eqiad.wmnet,F=/root/.my.cnf `
[x] Silence alerts on all hosts
[x] Topology changes: move everything under db1176
`db-switchover --timeout=15 --only-slave-move db1183.eqiad.wmnet db1176.eqiad.wmnet`
[x] Disable puppet db1176 and db1183
`sudo cumin 'db1176* or db1183*' 'disable-puppet "primary switchover T330847"'`
[x] Merge gerrit: https://gerrit.wikimedia.org/r/c/operations/puppet/+/895910
[x] Run puppet on dbproxy1017 and dbproxy1021 and check the config
`run-puppet-agent && cat /etc/haproxy/conf.d/db-master.cfg`
[] Start the failover: `!log Failover m5 from db1183 to db1176 - T330847 `
[] DB switchover
`root@cumin1001:~/wmfmariadbpy/wmfmariadbpy# db-switchover --skip-slave-move db1183 db1176`
[] Reload haproxies (dbproxy1021 is the active one)
```
dbproxy1017: systemctl reload haproxy && echo "show stat" | socat /run/haproxy/haproxy.sock stdio
dbproxy1021: systemctl reload haproxy && echo "show stat" | socat /run/haproxy/haproxy.sock stdio
```
[] kill connections on the old master (db1183)
` pt-kill --print --kill --victims all --match-all F=/dev/null,S=/run/mysqld/mysqld.sock`
[] Restart puppet on old and new masters (for heartbeat):db1176 and db1183
`sudo cumin 'db1176* or db1183*' 'run-puppet-agent -e "primary switchover T330847"'`
[] Check affected services
[] Clean orchestrator heartbeat to remove the old masters' one, otherwise Orchestrator will show lag: `delete from heartbeat where server_id=171970778`
[] Close this ticket and create a ticket to move db1183 somewhere else: db1183 will be moved to m1: T330977