- Write a Horizon FAQ https://wikitech.wikimedia.org/wiki/Help:Horizon_FAQ
- Give users adequate notice of the change
- Complete work on the Horizon proxy panel https://phabricator.wikimedia.org/T124183
- at pre-scheduled time:
- Remove wikitech link 'Manage DNS Domains' (via MediaWiki:Sidebar/Group:cloudadmin)
- Disable/hide/remove wikitech link 'Manage Addresses' (via MediaWiki:Sidebar/Group:projectadmin)
- Disable/hide/remove wikitech link 'Manage Web Proxies' (via MediaWiki:Sidebar/Group:projectadmin)
- Migrate existing ldap DNS to designate https://phabricator.wikimedia.org/T129272
- Create default domains for all projects (~andrew/projectdomains.py on californium)
- test behavior of labs-ns2/3 a lot
- change labs-ns0 and labs-ns1 to the new pdns hosts (labservices1001 and holmium)
- Replace wikitech link 'Manage Addresses' as a link to https://horizon.wikimedia.org/project/dns_domains/
- Replace wikitech link 'Manage We Proxies' as a link to https://horizon.wikimedia.org/project/proxy/
- Announce
- Clean-up: Turn off ldap/pdns servers