Shortcuts for canary deployment

According to ongoing discussions, all we need to start using canaries in production is:

• a set of hosts that have a different version installed.
  • one Azure LB
  • one HAProxy LB
  • one web
  • one API
  • one sidekiq
  • one git
• a subdomain pointing to these hosts, namely canary.gitlab.com
• a new environment in the deployment rake task.

We are not adding pages or altssh to this setup.

This will be isolated in a different VNet linked to the production data.

This node should not run any migration.

We will deliver this ASAP to unblock development.