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Fedi Admins of Lemmy, How do you keep your servers up to date without increasing downtime
(lemmy.blahaj.zone)
this post was submitted on 20 Sep 2023
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One way this problem can be solved is by having multiple servers with one being the production server. The other server is usually the failover backup, but when it’s time to upgrade the other server can go down for work. Then when it’s ready you use a load balancer to send all requests to the new server. That switchover happens instantaneously: one millisecond requests are being handled by the old server then the next millisecond they’re going to the new server.
It’s kind of like teleporting a new car into place as a way of avoiding a pit stop in a race. Terrible analogy but there you go.
How do you handle the database schema changes during updates? Have two databases and disable replication during the update? How do you sync changes that occur to the backup while/after the main is upgraded?
From my experience database schema changes require for all connections to drop, but they tend to happen a lot less compared to other updates.