nixpkgs/nixos/modules/services/cluster/kubernetes/controller-manager.nix
Christian Albrecht f9e2f76a59
nixos/kubernetes: Add systemd path units
to protect services from crashing and clobbering the logs when
certificates are not in place yet and make sure services are activated
when certificates are ready.

To prevent errors similar to "kube-controller-manager.path: Failed to
enter waiting state: Too many open files"
fs.inotify.max_user_instances has to be increased.
2019-03-03 19:34:57 +01:00

181 lines
5.5 KiB
Nix

{ config, lib, pkgs, ... }:
with lib;
let
top = config.services.kubernetes;
cfg = top.controllerManager;
in
{
###### interface
options.services.kubernetes.controllerManager = with lib.types; {
allocateNodeCIDRs = mkOption {
description = "Whether to automatically allocate CIDR ranges for cluster nodes.";
default = true;
type = bool;
};
bindAddress = mkOption {
description = "Kubernetes controller manager listening address.";
default = "127.0.0.1";
type = str;
};
clusterCidr = mkOption {
description = "Kubernetes CIDR Range for Pods in cluster.";
default = top.clusterCidr;
type = str;
};
enable = mkEnableOption "Kubernetes controller manager.";
extraOpts = mkOption {
description = "Kubernetes controller manager extra command line options.";
default = "";
type = str;
};
featureGates = mkOption {
description = "List set of feature gates";
default = top.featureGates;
type = listOf str;
};
insecurePort = mkOption {
description = "Kubernetes controller manager insecure listening port.";
default = 0;
type = int;
};
kubeconfig = top.lib.mkKubeConfigOptions "Kubernetes controller manager";
leaderElect = mkOption {
description = "Whether to start leader election before executing main loop.";
type = bool;
default = true;
};
rootCaFile = mkOption {
description = ''
Kubernetes controller manager certificate authority file included in
service account's token secret.
'';
default = top.caFile;
type = nullOr path;
};
securePort = mkOption {
description = "Kubernetes controller manager secure listening port.";
default = 10252;
type = int;
};
serviceAccountKeyFile = mkOption {
description = ''
Kubernetes controller manager PEM-encoded private RSA key file used to
sign service account tokens
'';
default = null;
type = nullOr path;
};
tlsCertFile = mkOption {
description = "Kubernetes controller-manager certificate file.";
default = null;
type = nullOr path;
};
tlsKeyFile = mkOption {
description = "Kubernetes controller-manager private key file.";
default = null;
type = nullOr path;
};
verbosity = mkOption {
description = ''
Optional glog verbosity level for logging statements. See
<link xlink:href="https://github.com/kubernetes/community/blob/master/contributors/devel/logging.md"/>
'';
default = null;
type = nullOr int;
};
};
###### implementation
config = mkIf cfg.enable (let
controllerManagerPaths = [
cfg.rootCaFile
cfg.tlsCertFile
cfg.tlsKeyFile
top.pki.certs.controllerManagerClient.cert
top.pki.certs.controllerManagerClient.key
];
in {
systemd.services.kube-controller-manager = {
description = "Kubernetes Controller Manager Service";
wantedBy = [ "kubernetes.target" ];
after = [ "kube-apiserver.service" ];
serviceConfig = {
RestartSec = "30s";
Restart = "on-failure";
Slice = "kubernetes.slice";
ExecStart = ''${top.package}/bin/kube-controller-manager \
--allocate-node-cidrs=${boolToString cfg.allocateNodeCIDRs} \
--bind-address=${cfg.bindAddress} \
${optionalString (cfg.clusterCidr!=null)
"--cluster-cidr=${cfg.clusterCidr}"} \
${optionalString (cfg.featureGates != [])
"--feature-gates=${concatMapStringsSep "," (feature: "${feature}=true") cfg.featureGates}"} \
--kubeconfig=${top.lib.mkKubeConfig "kube-controller-manager" cfg.kubeconfig} \
--leader-elect=${boolToString cfg.leaderElect} \
${optionalString (cfg.rootCaFile!=null)
"--root-ca-file=${cfg.rootCaFile}"} \
--port=${toString cfg.insecurePort} \
--secure-port=${toString cfg.securePort} \
${optionalString (cfg.serviceAccountKeyFile!=null)
"--service-account-private-key-file=${cfg.serviceAccountKeyFile}"} \
${optionalString (cfg.tlsCertFile!=null)
"--tls-cert-file=${cfg.tlsCertFile}"} \
${optionalString (cfg.tlsKeyFile!=null)
"--tls-key-file=${cfg.tlsKeyFile}"} \
${optionalString (elem "RBAC" top.apiserver.authorizationMode)
"--use-service-account-credentials"} \
${optionalString (cfg.verbosity != null) "--v=${toString cfg.verbosity}"} \
${cfg.extraOpts}
'';
WorkingDirectory = top.dataDir;
User = "kubernetes";
Group = "kubernetes";
};
path = top.path;
unitConfig.ConditionPathExists = controllerManagerPaths;
};
systemd.paths.kube-controller-manager = {
wantedBy = [ "kube-controller-manager.service" ];
pathConfig = {
PathExists = controllerManagerPaths;
PathChanged = controllerManagerPaths;
};
};
services.kubernetes.pki.certs = with top.lib; {
controllerManager = mkCert {
name = "kube-controller-manager";
CN = "kube-controller-manager";
action = "systemctl restart kube-controller-manager.service";
};
controllerManagerClient = mkCert {
name = "kube-controller-manager-client";
CN = "system:kube-controller-manager";
action = "systemctl restart kube-controller-manager.service";
};
};
services.kubernetes.controllerManager.kubeconfig.server = mkDefault top.apiserverAddress;
});
}