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Kubernetes? docker-compose? How should I organize my container services in 2024? (lemmy.world)

submitted 10 months ago by [email protected] to c/[email protected]

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Currently, I run Unraid and have all of my services' setup there as docker containers. While this is nice and easy to setup initially, it has some major downsides:

It's fragile. Unraid is prone to bugs/crashes with docker that take down my containers. It's also not resilient so when things break I have to log in and fiddle.
It's mutable. I can't use any infrastructure-as-code tools like terraform, and configuration sort of just exist in the UI. I can't really roll back or recover easily.
It's single-node. Everything is tied to my one big server that runs the NAS, but I'd rather have the NAS as a separate fairly low-power appliance and then have a separate machine to handle things like VMs and containers.

So I'm looking ahead and thinking about what the next iteration of my homelab will look like. While I like unraid for the storage stuff, I'm a little tired of wrangling it into a container orchestrator and hypervisor, and I think this year I'll split that job out to a dedicated machine. I'm comfortable with, and in fact prefer, IaC over fancy UIs and so would love to be able to use terraform or Pulumi or something like that. I would prefer something multi-node, as I want to be able to tie multiple machines together. And I want something that is fault-tolerant, as I host services for friends and family that currently require a lot of manual intervention to fix when they go down.

So the question is: how do you all do this? Kubernetes, docker-compose, Hashicorp Nomad? Do you run k3s, Harvester, or what? I'd love to get an idea of what people are doing and why, so I can get some ideas as to what I might do.

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[–] [email protected] 1 points 10 months ago (5 children)

Thanks! I'll do some testing over the weekend and see how it goes.

While I'd love to be able to use it for postgres, I figured that wouldn't work out well so probably won't try it any time soon. I do have several apps that use sqlite databases though, do you think those would have any issues? e.g. trilium, ntfy, ghost

The main downside to most of the distributed/clustered storage that I've tried is they always seem to corrupt sqlite db files due to not supporting locking or some other posix feature. Reading through some older github issues, it looks like that is something the dev of seaweedfs fixed hopefully.

[–] [email protected] 2 points 10 months ago (4 children)

The problem with using seaweedfs to a back your DBs is more on the filesystem than the implementations of POSIX features. When you are writing to a file, and the connection to seaweedfs breaks (container restart, wifi, you name it), then you might end up with a half-written file. If you upload pictures, this is unlikely, but DBs are doing several writes per second usually. So it is more likely one of those gets interrupted. In my case, my grafana sqlite DB would get corrupted every other week.

What I recommend is using DBs natively in your node's filesystem, and backing them up to seaweedfs periodically instead. That way your DBs 'work' but you can get them running again, and the backup is replicated in the distributed filesystem.

[–] [email protected] 1 points 10 months ago (1 children)

That's an interesting issue. Do you think the problem would be the same for any CSI plugin? I'm thinking of using my NAS as the storage brains of the operation and hooking it up with NFS or something, but would that have issues with stateful stuff like DB's too?

[–] [email protected] 2 points 10 months ago

I have never used NFS, but I think it would fare much better than seaweedfs because it uses Fuse to implement CSI. So for NFS I am sure the protocol would consider half-assed writes

would be the same for any CSI plugin

No, it would depend on the CSI plugin and how it is implemented. Ceph for example I know it has several, and cloud providers offer CSI volumes for their block storage (AWS EBS, GCP PD), and they will all perform differently. See this comment from a seaweedfs issue:

[...] It is always better to run databases on host volumes if you can (or on volumes provided by AWS EBS or similar). But with Seaweedfs especially if you are running postgres with seaweedfs-csi volume be prepared for data corruption. Seaweefs-csi uses FUSE, if anything happens to seaweedfs-csi (Nomad client restart, docker restart, OOM) mount will be lost and data corruption will happen.

Running on CEPH (since CEPH CSI using Kernel driver not FUSE) is acceptable if you fine with low TPS.

I found it was easier to make recoverable, backed up, host volumes than to make DBs run on high availability filesystems like seaweedfs (I admit I have not tried Ceph - the deployment looked a bit complicated/overkill for a homelab).

Postgres and sqlite are just not made for that environment. To run a high-availability DB, it is better to run a distributed DB made for that (think etcd, cassandra) than to run a non-distributed DB on top of a distributed filesystem.

Good luck! :)

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