this post was submitted on 10 Nov 2024
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Hello everyone!

My friend and I have each bought an optiplex server. Our goal is to selfhost a web app (static html) with redundancy. If my server goes down, his takes over and vice versa. I've looked into Docker Swarm, but each server has to be totally independent (each runs its own apps, with a few shared ones).

I can't find a solution that allows each server to take over and manage loadbalancing between the two. Ideally with traefik, because that's what we're currently using. To me the real issue is the DNS A record that point to only one IP :(

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[–] [email protected] 10 points 5 days ago (5 children)

Your challenge is that you need a loadbalancer. By hosting the loadbalancer yourself (e.g. on a VPS), you could also host your websites directly there...

My approach would be DNS-based. You can have multiple DNS A records, and the client picks one of them. With a little script you could remove one of the A Records of that server goes down. This way, you wouldn't need a central hardware.

[–] [email protected] 2 points 4 days ago* (last edited 4 days ago) (1 children)

That's an interesting idea, need to check if they offer some kind of a API for that.

But then there is this other thing, what about dns cache?

[–] [email protected] 3 points 4 days ago

Set the DNS cache time to 60 seconds.

Set the script to run on every host delayed by some time to avoid simultaneously accessing the API (e.g. run the script every other minute).

With this approach, you get automatic failover in at most 3 minutes.

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