134 lines
3.5 KiB
Nix
134 lines
3.5 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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top = config.services.kubernetes;
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cfg = top.flannel;
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# we want flannel to use kubernetes itself as configuration backend, not direct etcd
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storageBackend = "kubernetes";
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# needed for flannel to pass options to docker
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mkDockerOpts = pkgs.runCommand "mk-docker-opts" {
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buildInputs = [ pkgs.makeWrapper ];
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} ''
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mkdir -p $out
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# bashInteractive needed for `compgen`
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makeWrapper ${pkgs.bashInteractive}/bin/bash $out/mk-docker-opts --add-flags "${pkgs.kubernetes}/bin/mk-docker-opts.sh"
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'';
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in
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{
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###### interface
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options.services.kubernetes.flannel = {
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enable = mkEnableOption "enable flannel networking";
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};
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###### implementation
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config = mkIf cfg.enable {
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services.flannel = {
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enable = mkDefault true;
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network = mkDefault top.clusterCidr;
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inherit storageBackend;
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nodeName = config.services.kubernetes.kubelet.hostname;
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};
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services.kubernetes.kubelet = {
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networkPlugin = mkDefault "cni";
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cni.config = mkDefault [{
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name = "mynet";
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type = "flannel";
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cniVersion = "0.3.1";
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delegate = {
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isDefaultGateway = true;
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bridge = "docker0";
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};
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}];
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};
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systemd.services.mk-docker-opts = {
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description = "Pre-Docker Actions";
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path = with pkgs; [ gawk gnugrep ];
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script = ''
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${mkDockerOpts}/mk-docker-opts -d /run/flannel/docker
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systemctl restart docker
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'';
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serviceConfig.Type = "oneshot";
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};
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systemd.paths.flannel-subnet-env = {
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wantedBy = [ "flannel.service" ];
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pathConfig = {
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PathModified = "/run/flannel/subnet.env";
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Unit = "mk-docker-opts.service";
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};
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};
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systemd.services.docker = {
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environment.DOCKER_OPTS = "-b none";
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serviceConfig.EnvironmentFile = "-/run/flannel/docker";
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};
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# read environment variables generated by mk-docker-opts
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virtualisation.docker.extraOptions = "$DOCKER_OPTS";
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networking = {
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firewall.allowedUDPPorts = [
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8285 # flannel udp
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8472 # flannel vxlan
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];
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dhcpcd.denyInterfaces = [ "docker*" "flannel*" ];
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};
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services.kubernetes.pki.certs = {
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flannelClient = top.lib.mkCert {
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name = "flannel-client";
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CN = "flannel-client";
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action = "systemctl restart flannel.service";
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};
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};
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# give flannel som kubernetes rbac permissions if applicable
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services.kubernetes.addonManager.bootstrapAddons = mkIf ((storageBackend == "kubernetes") && (elem "RBAC" top.apiserver.authorizationMode)) {
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flannel-cr = {
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apiVersion = "rbac.authorization.k8s.io/v1beta1";
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kind = "ClusterRole";
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metadata = { name = "flannel"; };
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rules = [{
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apiGroups = [ "" ];
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resources = [ "pods" ];
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verbs = [ "get" ];
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}
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{
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apiGroups = [ "" ];
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resources = [ "nodes" ];
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verbs = [ "list" "watch" ];
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}
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{
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apiGroups = [ "" ];
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resources = [ "nodes/status" ];
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verbs = [ "patch" ];
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}];
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};
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flannel-crb = {
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apiVersion = "rbac.authorization.k8s.io/v1beta1";
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kind = "ClusterRoleBinding";
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metadata = { name = "flannel"; };
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roleRef = {
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apiGroup = "rbac.authorization.k8s.io";
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kind = "ClusterRole";
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name = "flannel";
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};
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subjects = [{
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kind = "User";
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name = "flannel-client";
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}];
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};
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};
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};
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}
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