Change Details

db2144 needs to be rebooted. **Affected wikis:**: x2 **Checklist:** NEW primary: db2142 OLD primary: db2144 [] Check configuration differences between new and old primary: ``` sudo pt-config-diff --defaults-file /root/.my.cnf h=db2144.codfw.wmnet h=db2142.codfw.wmnet ``` **Failover prep:** [] Silence alerts on all hosts: ``` sudo cookbook sre.hosts.downtime --hours 1 -r "Primary switchover x2 T334821" 'A:db-section-x2' ``` [] Set NEW primary with weight 0 (and depool it from API or vslow/dump groups if it is present). ``` sudo dbctl instance db2142 set-weight 0 sudo dbctl config commit -m "Set db2142 with weight 0 T334821" ``` [] Topology changes, move all replicas under NEW primary ``` This didn't work and I had to use orchestrator: sudo db-switchover --replicating-master --timeout=25 --only-slave-move db2144 db2142 ``` [] Disable puppet on both nodes ``` sudo cumin 'db2144* or db2142*' 'disable-puppet "primary switchover T334821"' ``` [] Merge gerrit puppet change to promote NEW primary: TO-DO **Failover:** [] Log the failover: ``` !log Starting x2 codfw failover from db2144 to db2142 - T334821 ``` [] Switch primaries: ``` sudo db-switchover --replicating-master --skip-slave-move db2144 db2142 echo "===== db2144 (OLD)"; sudo db-mysql db2144 -e 'show slave status\G' echo "===== db2142 (NEW)"; sudo db-mysql db2142 -e 'show slave status\G' ``` [] Promote NEW primary in dbctl, and remove read-only ``` sudo dbctl --scope codfw section x2 set-master db2142 sudo dbctl config commit -m "Promote db2142 to x2 primary T334821" ``` [] Restart puppet on both hosts: ``` sudo cumin 'db2144* or db2142*' 'run-puppet-agent -e "primary switchover T334821"' ``` **Clean up tasks:** [] Clean up heartbeat table(s). ``` sudo db-mysql db2142 heartbeat -e "delete from heartbeat where file like 'db2144%';" sudo db-mysql db1151 heartbeat -e "delete from heartbeat where file like 'db2144%';" ``` [] change events for query killer: ``` events_coredb_master.sql on the new primary db2142 events_coredb_slave.sql on the new slave db2144 ``` [] Update candidate primary dbctl and orchestrator notes ``` sudo dbctl instance db2144 set-candidate-master --section x2 true sudo dbctl instance db2142 set-candidate-master --section x2 false (dborch1001): sudo orchestrator-client -c untag -i db2142 --tag name=candidate (dborch1001): sudo orchestrator-client -c tag -i db2144 --tag name=candidate ``` [] Check zarcillo was updated ** db-switchover should do this. If it fails, do it manually: https://phabricator.wikimedia.org/P13956 ``` sudo db-mysql db1115 zarcillo -e "select * from masters where section = 'x2';" ``` [] (If needed): Depool db2144 for maintenance. ``` sudo dbctl instance db2144 depool sudo dbctl config commit -m "Depool db2144 T334821" ``` [] Change db2144 weight to mimic the previous weight db2142: ``` sudo dbctl instance db2144 edit ``` [] Update/resolve this ticket.

placeholderdb2144 needs to be rebooted. **Affected wikis:**: x2 **Checklist:** NEW primary: db2142 OLD primary: db2144 [] Check configuration differences between new and old primary: ``` sudo pt-config-diff --defaults-file /root/.my.cnf h=db2144.codfw.wmnet h=db2142.codfw.wmnet ``` **Failover prep:** [] Silence alerts on all hosts: ``` sudo cookbook sre.hosts.downtime --hours 1 -r "Primary switchover x2 T334821" 'A:db-section-x2' ``` [] Set NEW primary with weight 0 (and depool it from API or vslow/dump groups if it is present). ``` sudo dbctl instance db2142 set-weight 0 sudo dbctl config commit -m "Set db2142 with weight 0 T334821" ``` [] Topology changes, move all replicas under NEW primary ``` This didn't work and I had to use orchestrator: sudo db-switchover --replicating-master --timeout=25 --only-slave-move db2144 db2142 ``` [] Disable puppet on both nodes ``` sudo cumin 'db2144* or db2142*' 'disable-puppet "primary switchover T334821"' ``` [] Merge gerrit puppet change to promote NEW primary: TO-DO **Failover:** [] Log the failover: ``` !log Starting x2 codfw failover from db2144 to db2142 - T334821 ``` [] Switch primaries: ``` sudo db-switchover --replicating-master --skip-slave-move db2144 db2142 echo "===== db2144 (OLD)"; sudo db-mysql db2144 -e 'show slave status\G' echo "===== db2142 (NEW)"; sudo db-mysql db2142 -e 'show slave status\G' ``` [] Promote NEW primary in dbctl, and remove read-only ``` sudo dbctl --scope codfw section x2 set-master db2142 sudo dbctl config commit -m "Promote db2142 to x2 primary T334821" ``` [] Restart puppet on both hosts: ``` sudo cumin 'db2144* or db2142*' 'run-puppet-agent -e "primary switchover T334821"' ``` **Clean up tasks:** [] Clean up heartbeat table(s). ``` sudo db-mysql db2142 heartbeat -e "delete from heartbeat where file like 'db2144%';" sudo db-mysql db1151 heartbeat -e "delete from heartbeat where file like 'db2144%';" ``` [] change events for query killer: ``` events_coredb_master.sql on the new primary db2142 events_coredb_slave.sql on the new slave db2144 ``` [] Update candidate primary dbctl and orchestrator notes ``` sudo dbctl instance db2144 set-candidate-master --section x2 true sudo dbctl instance db2142 set-candidate-master --section x2 false (dborch1001): sudo orchestrator-client -c untag -i db2142 --tag name=candidate (dborch1001): sudo orchestrator-client -c tag -i db2144 --tag name=candidate ``` [] Check zarcillo was updated ** db-switchover should do this. If it fails, do it manually: https://phabricator.wikimedia.org/P13956 ``` sudo db-mysql db1115 zarcillo -e "select * from masters where section = 'x2';" ``` [] (If needed): Depool db2144 for maintenance. ``` sudo dbctl instance db2144 depool sudo dbctl config commit -m "Depool db2144 T334821" ``` [] Change db2144 weight to mimic the previous weight db2142: ``` sudo dbctl instance db2144 edit ``` [] Update/resolve this ticket.