Sergiusz Bazanski | c78cc13 | 2020-02-02 22:31:53 +0100 | [diff] [blame] | 1 | # Same as upstream kubelet.nix module from nixpkgs, but with the following |
| 2 | # changes: |
| 3 | # - cni tunables nuked and replaced with static host dirs, so that calico |
| 4 | # running on k8s can drop CNI plugins there itself |
| 5 | # - package configurable separately from rest of kubernetes |
| 6 | |
| 7 | { config, lib, pkgs, ... }: |
| 8 | |
| 9 | with lib; |
| 10 | |
| 11 | let |
| 12 | top = config.services.kubernetes; |
| 13 | cfg = top.kubelet; |
| 14 | |
| 15 | infraContainer = pkgs.dockerTools.buildImage { |
| 16 | name = "pause"; |
| 17 | tag = "latest"; |
| 18 | contents = top.package.pause; |
| 19 | config.Cmd = "/bin/pause"; |
| 20 | }; |
| 21 | |
| 22 | kubeconfig = top.lib.mkKubeConfig "kubelet" cfg.kubeconfig; |
| 23 | |
| 24 | manifestPath = "kubernetes/manifests"; |
| 25 | |
| 26 | taintOptions = with lib.types; { name, ... }: { |
| 27 | options = { |
| 28 | key = mkOption { |
| 29 | description = "Key of taint."; |
| 30 | default = name; |
| 31 | type = str; |
| 32 | }; |
| 33 | value = mkOption { |
| 34 | description = "Value of taint."; |
| 35 | type = str; |
| 36 | }; |
| 37 | effect = mkOption { |
| 38 | description = "Effect of taint."; |
| 39 | example = "NoSchedule"; |
| 40 | type = enum ["NoSchedule" "PreferNoSchedule" "NoExecute"]; |
| 41 | }; |
| 42 | }; |
| 43 | }; |
| 44 | |
| 45 | taints = concatMapStringsSep "," (v: "${v.key}=${v.value}:${v.effect}") (mapAttrsToList (n: v: v) cfg.taints); |
| 46 | in |
| 47 | { |
| 48 | imports = [ |
| 49 | #(mkRemovedOptionModule [ "services" "kubernetes" "kubelet" "applyManifests" ] "") |
| 50 | #(mkRemovedOptionModule [ "services" "kubernetes" "kubelet" "cadvisorPort" ] "") |
| 51 | #(mkRemovedOptionModule [ "services" "kubernetes" "kubelet" "allowPrivileged" ] "") |
| 52 | ]; |
| 53 | |
| 54 | # services/cluster/kubernetes/default.nix still wants to poke flannel, |
| 55 | # but since we nuke that module we have to add a fake tunable for it. |
| 56 | options.services.kubernetes.flannel = { |
| 57 | enable = mkEnableOption "enable flannel networking"; |
| 58 | }; |
| 59 | |
| 60 | ###### interface |
| 61 | options.services.kubernetes.kubelet = with lib.types; { |
| 62 | |
| 63 | address = mkOption { |
| 64 | description = "Kubernetes kubelet info server listening address."; |
| 65 | default = "0.0.0.0"; |
| 66 | type = str; |
| 67 | }; |
| 68 | |
| 69 | clusterDns = mkOption { |
| 70 | description = "Use alternative DNS."; |
| 71 | default = "10.1.0.1"; |
| 72 | type = str; |
| 73 | }; |
| 74 | |
| 75 | clusterDomain = mkOption { |
| 76 | description = "Use alternative domain."; |
| 77 | default = config.services.kubernetes.addons.dns.clusterDomain; |
| 78 | type = str; |
| 79 | }; |
| 80 | |
| 81 | clientCaFile = mkOption { |
| 82 | description = "Kubernetes apiserver CA file for client authentication."; |
| 83 | default = top.caFile; |
| 84 | type = nullOr path; |
| 85 | }; |
| 86 | |
| 87 | enable = mkEnableOption "Kubernetes kubelet."; |
| 88 | |
| 89 | extraOpts = mkOption { |
| 90 | description = "Kubernetes kubelet extra command line options."; |
| 91 | default = ""; |
| 92 | type = str; |
| 93 | }; |
| 94 | |
| 95 | featureGates = mkOption { |
| 96 | description = "List set of feature gates"; |
| 97 | default = top.featureGates; |
| 98 | type = listOf str; |
| 99 | }; |
| 100 | |
| 101 | healthz = { |
| 102 | bind = mkOption { |
| 103 | description = "Kubernetes kubelet healthz listening address."; |
| 104 | default = "127.0.0.1"; |
| 105 | type = str; |
| 106 | }; |
| 107 | |
| 108 | port = mkOption { |
| 109 | description = "Kubernetes kubelet healthz port."; |
| 110 | default = 10248; |
| 111 | type = int; |
| 112 | }; |
| 113 | }; |
| 114 | |
| 115 | hostname = mkOption { |
| 116 | description = "Kubernetes kubelet hostname override."; |
| 117 | default = config.networking.hostName; |
| 118 | type = str; |
| 119 | }; |
| 120 | |
| 121 | kubeconfig = top.lib.mkKubeConfigOptions "Kubelet"; |
| 122 | |
| 123 | manifests = mkOption { |
| 124 | description = "List of manifests to bootstrap with kubelet (only pods can be created as manifest entry)"; |
| 125 | type = attrsOf attrs; |
| 126 | default = {}; |
| 127 | }; |
| 128 | |
| 129 | networkPlugin = mkOption { |
| 130 | description = "Network plugin to use by Kubernetes."; |
| 131 | type = nullOr (enum ["cni" "kubenet"]); |
| 132 | default = "kubenet"; |
| 133 | }; |
| 134 | |
| 135 | nodeIp = mkOption { |
| 136 | description = "IP address of the node. If set, kubelet will use this IP address for the node."; |
| 137 | default = null; |
| 138 | type = nullOr str; |
| 139 | }; |
| 140 | |
| 141 | registerNode = mkOption { |
| 142 | description = "Whether to auto register kubelet with API server."; |
| 143 | default = true; |
| 144 | type = bool; |
| 145 | }; |
| 146 | |
| 147 | package = mkOption { |
| 148 | description = "Kubernetes package to use."; |
| 149 | type = types.package; |
| 150 | default = pkgs.kubernetes; |
| 151 | defaultText = "pkgs.kubernetes"; |
| 152 | }; |
| 153 | |
| 154 | port = mkOption { |
| 155 | description = "Kubernetes kubelet info server listening port."; |
| 156 | default = 10250; |
| 157 | type = int; |
| 158 | }; |
| 159 | |
| 160 | seedDockerImages = mkOption { |
| 161 | description = "List of docker images to preload on system"; |
| 162 | default = []; |
| 163 | type = listOf package; |
| 164 | }; |
| 165 | |
| 166 | taints = mkOption { |
| 167 | description = "Node taints (https://kubernetes.io/docs/concepts/configuration/assign-pod-node/)."; |
| 168 | default = {}; |
| 169 | type = attrsOf (submodule [ taintOptions ]); |
| 170 | }; |
| 171 | |
| 172 | tlsCertFile = mkOption { |
| 173 | description = "File containing x509 Certificate for HTTPS."; |
| 174 | default = null; |
| 175 | type = nullOr path; |
| 176 | }; |
| 177 | |
| 178 | tlsKeyFile = mkOption { |
| 179 | description = "File containing x509 private key matching tlsCertFile."; |
| 180 | default = null; |
| 181 | type = nullOr path; |
| 182 | }; |
| 183 | |
| 184 | unschedulable = mkOption { |
| 185 | description = "Whether to set node taint to unschedulable=true as it is the case of node that has only master role."; |
| 186 | default = false; |
| 187 | type = bool; |
| 188 | }; |
| 189 | |
| 190 | verbosity = mkOption { |
| 191 | description = '' |
| 192 | Optional glog verbosity level for logging statements. See |
| 193 | <link xlink:href="https://github.com/kubernetes/community/blob/master/contributors/devel/logging.md"/> |
| 194 | ''; |
| 195 | default = null; |
| 196 | type = nullOr int; |
| 197 | }; |
| 198 | |
| 199 | }; |
| 200 | |
| 201 | ###### implementation |
| 202 | config = mkMerge [ |
| 203 | (mkIf cfg.enable { |
| 204 | services.kubernetes.kubelet.seedDockerImages = [infraContainer]; |
| 205 | |
| 206 | systemd.services.kubelet = { |
| 207 | description = "Kubernetes Kubelet Service"; |
| 208 | wantedBy = [ "kubernetes.target" ]; |
| 209 | after = [ "network.target" "docker.service" "kube-apiserver.service" ]; |
| 210 | path = with pkgs; [ gitMinimal openssh docker utillinux iproute ethtool thin-provisioning-tools iptables socat ] ++ top.path; |
| 211 | preStart = '' |
| 212 | ${concatMapStrings (img: '' |
| 213 | echo "Seeding docker image: ${img}" |
| 214 | docker load <${img} |
| 215 | '') cfg.seedDockerImages} |
| 216 | ''; |
| 217 | serviceConfig = { |
| 218 | Slice = "kubernetes.slice"; |
| 219 | CPUAccounting = true; |
| 220 | MemoryAccounting = true; |
| 221 | Restart = "on-failure"; |
| 222 | RestartSec = "1000ms"; |
| 223 | ExecStart = ''${cfg.package}/bin/kubelet \ |
| 224 | --address=${cfg.address} \ |
| 225 | --authentication-token-webhook \ |
| 226 | --authentication-token-webhook-cache-ttl="10s" \ |
| 227 | --authorization-mode=Webhook \ |
| 228 | ${optionalString (cfg.clientCaFile != null) |
| 229 | "--client-ca-file=${cfg.clientCaFile}"} \ |
| 230 | ${optionalString (cfg.clusterDns != "") |
| 231 | "--cluster-dns=${cfg.clusterDns}"} \ |
| 232 | ${optionalString (cfg.clusterDomain != "") |
| 233 | "--cluster-domain=${cfg.clusterDomain}"} \ |
| 234 | --cni-conf-dir=/opt/cni/conf \ |
| 235 | --cni-bin-dir=/opt/cni/bin \ |
| 236 | ${optionalString (cfg.featureGates != []) |
| 237 | "--feature-gates=${concatMapStringsSep "," (feature: "${feature}=true") cfg.featureGates}"} \ |
| 238 | --hairpin-mode=hairpin-veth \ |
| 239 | --healthz-bind-address=${cfg.healthz.bind} \ |
| 240 | --healthz-port=${toString cfg.healthz.port} \ |
| 241 | --hostname-override=${cfg.hostname} \ |
| 242 | --kubeconfig=${kubeconfig} \ |
| 243 | ${optionalString (cfg.networkPlugin != null) |
| 244 | "--network-plugin=${cfg.networkPlugin}"} \ |
| 245 | ${optionalString (cfg.nodeIp != null) |
| 246 | "--node-ip=${cfg.nodeIp}"} \ |
| 247 | --pod-infra-container-image=pause \ |
| 248 | ${optionalString (cfg.manifests != {}) |
| 249 | "--pod-manifest-path=/etc/${manifestPath}"} \ |
| 250 | --port=${toString cfg.port} \ |
| 251 | --register-node=${boolToString cfg.registerNode} \ |
| 252 | ${optionalString (taints != "") |
| 253 | "--register-with-taints=${taints}"} \ |
| 254 | --root-dir=${top.dataDir} \ |
| 255 | ${optionalString (cfg.tlsCertFile != null) |
| 256 | "--tls-cert-file=${cfg.tlsCertFile}"} \ |
| 257 | ${optionalString (cfg.tlsKeyFile != null) |
| 258 | "--tls-private-key-file=${cfg.tlsKeyFile}"} \ |
| 259 | ${optionalString (cfg.verbosity != null) "--v=${toString cfg.verbosity}"} \ |
| 260 | ${cfg.extraOpts} |
| 261 | ''; |
| 262 | WorkingDirectory = top.dataDir; |
| 263 | }; |
| 264 | }; |
| 265 | |
| 266 | boot.kernelModules = ["br_netfilter"]; |
| 267 | |
| 268 | services.kubernetes.kubelet.hostname = with config.networking; |
| 269 | mkDefault (hostName + optionalString (domain != null) ".${domain}"); |
| 270 | |
| 271 | services.kubernetes.pki.certs = with top.lib; { |
| 272 | kubelet = mkCert { |
| 273 | name = "kubelet"; |
| 274 | CN = top.kubelet.hostname; |
| 275 | action = "systemctl restart kubelet.service"; |
| 276 | |
| 277 | }; |
| 278 | kubeletClient = mkCert { |
| 279 | name = "kubelet-client"; |
| 280 | CN = "system:node:${top.kubelet.hostname}"; |
| 281 | fields = { |
| 282 | O = "system:nodes"; |
| 283 | }; |
| 284 | action = "systemctl restart kubelet.service"; |
| 285 | }; |
| 286 | }; |
| 287 | |
| 288 | services.kubernetes.kubelet.kubeconfig.server = mkDefault top.apiserverAddress; |
| 289 | }) |
| 290 | |
| 291 | (mkIf (cfg.enable && cfg.manifests != {}) { |
| 292 | environment.etc = mapAttrs' (name: manifest: |
| 293 | nameValuePair "${manifestPath}/${name}.json" { |
| 294 | text = builtins.toJSON manifest; |
| 295 | mode = "0755"; |
| 296 | } |
| 297 | ) cfg.manifests; |
| 298 | }) |
| 299 | |
| 300 | (mkIf (cfg.unschedulable && cfg.enable) { |
| 301 | services.kubernetes.kubelet.taints.unschedulable = { |
| 302 | value = "true"; |
| 303 | effect = "NoSchedule"; |
| 304 | }; |
| 305 | }) |
| 306 | |
| 307 | ]; |
| 308 | } |