Declaring k3s with helm and cluster

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  • services.k3s.manifests lets you configure kubernetes manifests in your Nix config. It converts the manifests to YAML and applies them in a manner similar to kubectl apply. For example, you can create a namespace with the following config
services.k3s.manifests = {
  test-ns.content = {
    apiVersion = "v1";
    kind = "Namespace";
    metadata.name = "test";
  };
};

If nothing happens for you, search for the manifest name (test-ns in the example above) in the k3s logs (journalctl -u k3s). It will show you if there is a problem with the manifest.

  • services.k3s.charts isn’t useful on its own, it just makes charts accessible from inside the cluster.
  • services.k3s.autoDeployCharts can be used to actually deploy Helm charts in the cluster. It is a new option that is only available on unstable (added in nixos/k3s: add `autoDeployCharts` option · NixOS/nixpkgs@95b894b · GitHub). Use this to install flux via the Helm chart in your cluster.

There is also a post that explains how to use these options: K3s clusters and deployments in pure Nix