**Run everything in a tmux named `switchover`**
## Services
- [ ] `scap lock --all "Datacenter Switchover: Services & Traffic - T346330" on deploy1002
- [ ] `sudo cookbook sre.discovery.datacenter depool eqiad --all --reason "Datacenter Switchover: Services" --task-id T346330` on cumin1001
## Traffic
- [ ] merge https://gerrit.wikimedia.org/r/c/operations/dns/+/958920
- [ ] run authdns-update
## deployment server
- [ ] log SAL: `!log Switch deployment server - T346330`
- [ ] `sudo cumin 'R:class = role::deployment_server' 'disable-puppet "Switchover of the deployment server"'`
- [ ] merge https://gerrit.wikimedia.org/r/c/operations/dns/+/957734
- [ ] merge https://gerrit.wikimedia.org/r/c/operations/puppet/+/957736
- [ ] Run puppet on deploy2002.codfw.wmnet: `sudo cumin deploy2002.codfw.wmnet 'run-puppet-agent --enable "Switchover of the deployment server"'`
- [ ] Run puppet on all other deployment servers `sudo cumin 'R:class = role::deployment_server' 'run-puppet-agent --enable "Switchover of the deployment server"'`
- [ ] Run puppet on alert* `sudo cumin 'A:icinga' 'run-puppet-agent -q'`
- [ ] Cronjob check `sudo cumin deploy2002.codfw.wmnet 'systemctl list-units | grep -A1 sync_deployment_dir'`
- [ ] remove scap lock
- [ ] Test scap deployment `cd /srv/mediawiki-staging; scap sync-world "check the deployment server after switchover"`
- [ ] ~~Test scap3 deployments work (restbase?)~~ => **nope**, due to T346354
- [ ] email ops@ and wikitech-l about the switch