Managing required restarts
When Ubuntu issues critical security patches, we update your servers immediately whenever we can. If doing so would disrupt your services, we need you to trigger the restart manually (so that we don't disrupt your application(s)).
If you'd like to understand more about why these restarts are required, please read our reference guide on the subject.
Preparing to restart
Doing so after-hours is recommended to minimize disruption.
In order to minimize downtime, you can restart one server at a time if you have a load balancer in place, or you can use failover groups to achieve the same thing.
You can also use the maintenance page to temporarily notify your users that you are performing maintenance.
Restarting via SSH
To restart your server, it is recommended that you SSH to your server and run either of the following terminal commands:
sudo shutdown -r now
Restarted servers may get new IP addresses
Depending on your cloud provider, if you shut your server down via their dashboard, you may have new IP addresses assigned to your server. These may take a little while to propagate to Cloud 66 and your DNS provider, meaning you may have some unnecessary downtime should you choose this restart method.