Selfhosted
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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have you found many self-hosted services that suppprt that kind of HA? I can't imagine services like torrent clients allowing you to stream writes to one node while replicating to the other, though maybe I'm misunderstanding the setup
They don't have to support it. It's more that the database they are connecting to supports HA, and/or both are using shared storage. So when one container dies, kubernetes restarts another container on another node with the same shared storage attached.
Docker is often configured to automatically restart containers when a container dies, just in case it's a one off bug or something like that, and kubernetes is like a more resilient version of that.
I'm aware of databases that support HA, but the vast majority of self-hosted apps I've encountered use file storage, even if they have a database as well. It sounds like you're proposing shared storage like an NFS share. But if you're upgrading nodes, at some point you have to upgrade the node hosting the shared storage right? Wouldn't that take down all services? Unless you use a distributed storage system, but I've heard those can get very complicated...
Kubernetes makes distributed storage easy.
Basically, all the components get deployed for you, since that's part of what kubernetes is good at.
And then, services/containers can provision storage by requesting storage via making a "claim" and whatever distributed storage providee you have gives it to you.
Have you tried using Ceph or other distributed storage systems in your kubernetes cluster?