diff options
Diffstat (limited to 'nixpkgs/nixos/modules/services/cluster/kubernetes/addon-manager.nix')
| -rw-r--r-- | nixpkgs/nixos/modules/services/cluster/kubernetes/addon-manager.nix | 242 |
1 files changed, 242 insertions, 0 deletions
diff --git a/nixpkgs/nixos/modules/services/cluster/kubernetes/addon-manager.nix b/nixpkgs/nixos/modules/services/cluster/kubernetes/addon-manager.nix new file mode 100644 index 000000000000..ad7d17c9c283 --- /dev/null +++ b/nixpkgs/nixos/modules/services/cluster/kubernetes/addon-manager.nix @@ -0,0 +1,242 @@ +{ config, lib, pkgs, ... }: + +with lib; + +let + top = config.services.kubernetes; + cfg = top.addonManager; + + isRBACEnabled = elem "RBAC" top.apiserver.authorizationMode; + + addons = pkgs.runCommand "kubernetes-addons" { } '' + mkdir -p $out + # since we are mounting the addons to the addon manager, they need to be copied + ${concatMapStringsSep ";" (a: "cp -v ${a}/* $out/") (mapAttrsToList (name: addon: + pkgs.writeTextDir "${name}.json" (builtins.toJSON addon) + ) (cfg.addons))} + ''; +in +{ + ###### interface + options.services.kubernetes.addonManager = with lib.types; { + + bootstrapAddons = mkOption { + description = '' + Bootstrap addons are like regular addons, but they are applied with cluster-admin rigths. + They are applied at addon-manager startup only. + ''; + default = { }; + type = attrsOf attrs; + example = literalExample '' + { + "my-service" = { + "apiVersion" = "v1"; + "kind" = "Service"; + "metadata" = { + "name" = "my-service"; + "namespace" = "default"; + }; + "spec" = { ... }; + }; + } + ''; + }; + + addons = mkOption { + description = "Kubernetes addons (any kind of Kubernetes resource can be an addon)."; + default = { }; + type = attrsOf (either attrs (listOf attrs)); + example = literalExample '' + { + "my-service" = { + "apiVersion" = "v1"; + "kind" = "Service"; + "metadata" = { + "name" = "my-service"; + "namespace" = "default"; + }; + "spec" = { ... }; + }; + } + // import <nixpkgs/nixos/modules/services/cluster/kubernetes/dashboard.nix> { cfg = config.services.kubernetes; }; + ''; + }; + + enable = mkEnableOption "Kubernetes addon manager"; + + kubeconfig = top.lib.mkKubeConfigOptions "Kubernetes addon manager"; + bootstrapAddonsKubeconfig = top.lib.mkKubeConfigOptions "Kubernetes addon manager bootstrap"; + }; + + ###### implementation + config = let + + addonManagerPaths = filter (a: a != null) [ + cfg.kubeconfig.caFile + cfg.kubeconfig.certFile + cfg.kubeconfig.keyFile + ]; + bootstrapAddonsPaths = filter (a: a != null) [ + cfg.bootstrapAddonsKubeconfig.caFile + cfg.bootstrapAddonsKubeconfig.certFile + cfg.bootstrapAddonsKubeconfig.keyFile + ]; + + in mkIf cfg.enable { + environment.etc."kubernetes/addons".source = "${addons}/"; + + #TODO: Get rid of kube-addon-manager in the future for the following reasons + # - it is basically just a shell script wrapped around kubectl + # - it assumes that it is clusterAdmin or can gain clusterAdmin rights through serviceAccount + # - it is designed to be used with k8s system components only + # - it would be better with a more Nix-oriented way of managing addons + systemd.services.kube-addon-manager = { + description = "Kubernetes addon manager"; + wantedBy = [ "kubernetes.target" ]; + after = [ "kube-node-online.target" ]; + before = [ "kubernetes.target" ]; + environment = { + ADDON_PATH = "/etc/kubernetes/addons/"; + KUBECONFIG = top.lib.mkKubeConfig "kube-addon-manager" cfg.kubeconfig; + }; + path = with pkgs; [ gawk kubectl ]; + preStart = '' + until kubectl -n kube-system get serviceaccounts/default 2>/dev/null; do + echo kubectl -n kube-system get serviceaccounts/default: exit status $? + sleep 2 + done + ''; + serviceConfig = { + Slice = "kubernetes.slice"; + ExecStart = "${top.package}/bin/kube-addons"; + WorkingDirectory = top.dataDir; + User = "kubernetes"; + Group = "kubernetes"; + Restart = "on-failure"; + RestartSec = 10; + }; + unitConfig.ConditionPathExists = addonManagerPaths; + }; + + systemd.paths.kube-addon-manager = { + wantedBy = [ "kube-addon-manager.service" ]; + pathConfig = { + PathExists = addonManagerPaths; + PathChanged = addonManagerPaths; + }; + }; + + services.kubernetes.addonManager.kubeconfig.server = mkDefault top.apiserverAddress; + + systemd.services.kube-addon-manager-bootstrap = mkIf (top.apiserver.enable && top.addonManager.bootstrapAddons != {}) { + wantedBy = [ "kube-control-plane-online.target" ]; + after = [ "kube-apiserver.service" ]; + before = [ "kube-control-plane-online.target" ]; + path = [ pkgs.kubectl ]; + environment = { + KUBECONFIG = top.lib.mkKubeConfig "kube-addon-manager-bootstrap" cfg.bootstrapAddonsKubeconfig; + }; + preStart = with pkgs; let + files = mapAttrsToList (n: v: writeText "${n}.json" (builtins.toJSON v)) + cfg.bootstrapAddons; + in '' + until kubectl auth can-i '*' '*' -q 2>/dev/null; do + echo kubectl auth can-i '*' '*': exit status $? + sleep 2 + done + + kubectl apply -f ${concatStringsSep " \\\n -f " files} + ''; + script = "echo Ok"; + unitConfig.ConditionPathExists = bootstrapAddonsPaths; + }; + + systemd.paths.kube-addon-manager-bootstrap = { + wantedBy = [ "kube-addon-manager-bootstrap.service" ]; + pathConfig = { + PathExists = bootstrapAddonsPaths; + PathChanged = bootstrapAddonsPaths; + }; + }; + + services.kubernetes.addonManager.bootstrapAddonsKubeconfig.server = mkDefault top.apiserverAddress; + + services.kubernetes.addonManager.bootstrapAddons = mkIf isRBACEnabled + (let + name = system:kube-addon-manager; + namespace = "kube-system"; + in + { + + kube-addon-manager-r = { + apiVersion = "rbac.authorization.k8s.io/v1"; + kind = "Role"; + metadata = { + inherit name namespace; + }; + rules = [{ + apiGroups = ["*"]; + resources = ["*"]; + verbs = ["*"]; + }]; + }; + + kube-addon-manager-rb = { + apiVersion = "rbac.authorization.k8s.io/v1"; + kind = "RoleBinding"; + metadata = { + inherit name namespace; + }; + roleRef = { + apiGroup = "rbac.authorization.k8s.io"; + kind = "Role"; + inherit name; + }; + subjects = [{ + apiGroup = "rbac.authorization.k8s.io"; + kind = "User"; + inherit name; + }]; + }; + + kube-addon-manager-cluster-lister-cr = { + apiVersion = "rbac.authorization.k8s.io/v1"; + kind = "ClusterRole"; + metadata = { + name = "${name}:cluster-lister"; + }; + rules = [{ + apiGroups = ["*"]; + resources = ["*"]; + verbs = ["list"]; + }]; + }; + + kube-addon-manager-cluster-lister-crb = { + apiVersion = "rbac.authorization.k8s.io/v1"; + kind = "ClusterRoleBinding"; + metadata = { + name = "${name}:cluster-lister"; + }; + roleRef = { + apiGroup = "rbac.authorization.k8s.io"; + kind = "ClusterRole"; + name = "${name}:cluster-lister"; + }; + subjects = [{ + kind = "User"; + inherit name; + }]; + }; + }); + + services.kubernetes.pki.certs = { + addonManager = top.lib.mkCert { + name = "kube-addon-manager"; + CN = "system:kube-addon-manager"; + action = "systemctl restart kube-addon-manager.service"; + }; + }; + }; + +} |