3 ms·

Have your load balancer drain connections to a web server. When it has no request in progress, deploy to it. When that's done, move on the the next web server.

• singlow 11y ago
  This doesn't solve the problem when there is a DB migration.
  • sciurus 11y ago
    This is covered by herge's parent comment. Deploy code that can work with either the old or new DB structure before you perform the migration.