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| K3s is a simplified version of [[Kubernetes]]. It bundles all components for a kubernetes cluster into a few of small binaries. | | [https://k3s.io/ K3s] is a simplified Kubernetes version that bundles Kubernetes cluster components into a few small binaries optimized for Edge and IoT devices. |
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| == Single node setup ==
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| <syntaxHighlight lang=nix>
| | NixOS's K3s documentation is available at: |
| {
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| # This is required so that pod can reach the API server (running on port 6443 by default)
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| networking.firewall.allowedTCPPorts = [ 6443 ];
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| services.k3s.enable = true;
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| services.k3s.role = "server";
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| services.k3s.extraFlags = toString [
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| # "--kubelet-arg=v=4" # Optionally add additional args to k3s
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| ];
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| environment.systemPackages = [ pkgs.k3s ];
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| }
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| </syntaxHighlight>
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| After enabling, you can access your cluster through <code>sudo k3s kubectl</code> i.e. <code>sudo k3s kubectl cluster-info</code>, or by using the generated kubeconfig file in <code>/etc/rancher/k3s/k3s.yaml</code>
| | https://github.com/NixOS/nixpkgs/blob/master/pkgs/applications/networking/cluster/k3s/README.md |
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| == Multi-node setup ==
| | [[Category:Container]] |
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| See this [https://github.com/Mic92/doctor-cluster-config/tree/master/modules/k3s real world example]. You might want to ignore some parts of it i.e. the monitoring as this is specific to our setup.
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| The K3s server needs to import <code>modules/k3s/server.nix</code> and an agent <code>modules/k3s/agent.nix</code>.
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| Tipp: You might run into issues with coredns not being reachable from agent nodes. Right now we disable the NixOS firewall all together until we find a better solution.
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| == ZFS support ==
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| K3s's builtin containerd does not support the zfs snapshotter. However it is possible to configure it to use an external containerd:
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| <syntaxHighlight lang=nix>
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| virtualisation.containerd.enable = true;
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| # TODO describe how to enable zfs snapshotter in containerd
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| services.k3s.extraFlags = toString [
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| "--container-runtime-endpoint unix:///run/containerd/containerd.sock"
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| ];
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| </syntaxHighlight>
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| [[Category:Applications]]
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| [[Category:Server]]
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| [[Category:orchestration]] | |
