this post was submitted on 29 Jan 2025
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Reverse proxy without a single point of failure (lemmy.sdf.org)
submitted 2 days ago by victory@lemmy.sdf.org to c/selfhosted@lemmy.world
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I'm thinking of expanding my homelab to support running some paid SaaS projects out of my house, and so I need to start thinking about uptime guarantees.

I want to set up a cluster where every service lives on at least two machines, so that no single machine dying can take a service down. The problem is the reverse proxy: the router still has to point port 443 at a single fixed IP address running Caddy, and that machine will always be a single point of failure. How would I go about running two or more reverse proxy servers with failover?

I'm guessing the answer has something to do with the router, and possibly getting a more advanced router or running an actual OS on the router that can handle failover. But at that point the router is a single point of failure! And yes, that's unavoidable... but I'm reasonably confident that the unmodified commodity router I've used for years is unlikely to spontaneously die, whereas I've had very bad luck with cheap fanless and single-board computers, so anything I buy to use as an advanced router is just a new SPOF and I might as well have used it for the reverse proxy.

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[–] slazer2au@lemmy.world 3 points 2 days ago

So you have 2, or 3 spof, your home internet, your home router, and your reverse proxy container.

You can solve most of that with a second internet connection on its own router and some k3s/k8s

Current router points to one container then you have your second router point to the other container. You can use DNS load balancing to share the connections over your 2 internet connections.

Depending on your monitoring system you if a connection goes down you could then trigger a DNS update to remove the offline connection from DNS. You will have to set the ttl of the record to facilitate the change more rapidly.