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Anyone else running Lemmy with Kubernetes? (lemmy.kutara.io)
submitted 1 year ago by anthr76@lemmy.kutara.io to c/selfhosted@lemmy.world
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I just spun up Lemmy on my Kubernetes cluster with nginx-unprivileged and ingress-nginx. All is well so far! I’m thinking about posting the Kustomization manifests and continuing to maintain and publish OCI’s per version release of Lemmy.

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[-] magi093@l.tta.wtf 2 points 1 year ago

👋 I'm not using Kustomize, just throwing Deployment manifests and such at the cluster manually. Works pretty nicely, though I had some trouble setting up the custom nginx stuff to proxy stuff in - I ended up running a new nginx instance and pointing the Ingress at that rather than the Lemmy pods directly. Maybe there's a more elegant solution I'm missing?

[-] dudeami0@lemmy.dudeami.win 2 points 1 year ago

I currently am running the instance I am responding from on kubernetes. I published a helm chart, and others are working on them too. I feel being able to quickly deploy a kubernetes instance will help a lot of smaller instances pop up, and eventually be a good method of handling larger instances once horizontal scaling is figured out.

[-] wiox@compuverse.uk 2 points 1 year ago

I tested your helm chart and it just worked :)

[-] tj111@lemmy.fmhy.ml 1 points 1 year ago

Is there a place I can read more about the horizontal scaling issues lemmy has?

[-] Andreas@feddit.dk 1 points 1 year ago

Saved this comment. It claims that the Lemmy frontend and backend are stateless and can be scaled arbitrarily, as can the web server. The media server (pict-rs) and Postgres database are the limitations to scaling. I'm working to deploy Lemmy with external object storage to solve media storage scaling and there's probably some database experts figuring out Postgres optimization and scaling as well. None of the instances are big enough to run into serious issues with vertical scaling yet, so this won't be a problem for a while.

[-] blazarious@mylem.me 2 points 1 year ago

I’ve got my pictrs backed by an S3, so that should scale well.

I had some issues with the image server, though, and I had multiple of them running at the same time at some point, so that may have been the cause.

[-] rs5th@lemmy.scottlabs.io 0 points 1 year ago

I am! @gabe565@lemmy.cook.gg and I worked on setting this up yesterday. He mentioned building a Helm chart for the whole shebang.

[-] gabe565@lemmy.cook.gg 0 points 1 year ago* (last edited 1 year ago)

Yep I'm still working on a helm chart. Currently, each service is deployed with the bjw-s app-template helm chart, but I'd like to combine it all into a single chart.

The hardest part was getting ingress-nginx to pass ActivityPub requests to the backend, but we settled on a hack that seems to work well. We had to add the following configuration snippet to the frontend's ingress annotations:

nginx.ingress.kubernetes.io/configuration-snippet: |
  if ($http_accept = "application/activity+json") {
    set $proxy_upstream_name "lemmy-lemmy-8536";
  }
  if ($http_accept = "application/ld+json; profile=\"https://www.w3.org/ns/activitystreams\"") {
    set $proxy_upstream_name "lemmy-lemmy-8536";
  }
  if ($request_method = POST) {
    set $proxy_upstream_name "lemmy-lemmy-8536";
  }

The value of the variable is $NAMESPACE-$SERVICE-$PORT.
I tested this pretty thoroughly and haven't been able to break it so far, but please let me know if anybody has a better solution!

[-] anthr76@lemmy.kutara.io 1 points 1 year ago* (last edited 1 year ago)

Firstly, awesome to hear you're using bjw-s app-template helm chart. He's my good friend and former coworker :)

I'm also doing what @seang96@exploding-heads.com is doing.

While I don't consider this completed yet I have posted how I'm doing things so far here

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this post was submitted on 14 Jun 2023
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