Forum Updating SaaS with no downtime?

posted 3 years ago

I have two AWS EC2 servers behind load balancer and one database with replication...

How do I update Laravel code with no down time? Idea was to remove one server from load balancer and update Laravel code while second server serves the traffic. But If I execute migration, it will change the database and second server will produce errors :/

Last updated 2 years ago.

james4645

replied 3 years ago

If you make your migrations right it's doable. You can run old code on a migrated DB if the migrations are only additive, and you haven't changed or deleted something the old code relies on.

Then you can just do one server at a time like this:

Take Server 1 Offline
Update Server 1
Use Server 1 to perform DB migrations
Bring Server 1 Back Online
Take Server 2 Offline
Update Server 2
Bring Server 2 back online

Or just use Envoyer. The other question is do you really "need" zero downtime deploys or does it just sound nice to have? Forge can deploy one of my apps in less than 30 seconds.

Last updated by @james4645 3 years ago.