nixpkgs/nixos/modules/services/cluster/kubernetes.nix

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{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.kubernetes;
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skipAttrs = attrs: map (filterAttrs (k: v: k != "enable"))
(filter (v: !(hasAttr "enable" v) || v.enable) attrs);
infraContainer = pkgs.dockerTools.buildImage {
name = "pause";
tag = "latest";
contents = cfg.package.pause;
config.Cmd = "/bin/pause";
};
kubeconfig = pkgs.writeText "kubeconfig" (builtins.toJSON {
apiVersion = "v1";
kind = "Config";
clusters = [{
name = "local";
cluster.certificate-authority = cfg.kubeconfig.caFile;
cluster.server = cfg.kubeconfig.server;
}];
users = [{
name = "kubelet";
user = {
client-certificate = cfg.kubeconfig.certFile;
client-key = cfg.kubeconfig.keyFile;
};
}];
contexts = [{
context = {
cluster = "local";
user = "kubelet";
};
current-context = "kubelet-context";
}];
});
policyFile = pkgs.writeText "kube-policy"
concatStringsSep "\n" (map (builtins.toJSON cfg.apiserver.authorizationPolicy));
cniConfig = pkgs.buildEnv {
name = "kubernetes-cni-config";
paths = imap (i: entry:
pkgs.writeTextDir "${toString (10+i)}-${entry.type}.conf" (builtins.toJSON entry)
) cfg.kubelet.cni.config;
};
manifests = pkgs.buildEnv {
name = "kubernetes-manifests";
paths = mapAttrsToList (name: manifest:
pkgs.writeTextDir "${name}.json" (builtins.toJSON manifest)
) cfg.kubelet.manifests;
};
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in {
###### interface
options.services.kubernetes = {
roles = mkOption {
description = ''
Kubernetes role that this machine should take.
Master role will enable etcd, apiserver, scheduler and controller manager
services. Node role will enable etcd, docker, kubelet and proxy services.
'';
default = [];
type = types.listOf (types.enum ["master" "node"]);
};
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package = mkOption {
description = "Kubernetes package to use.";
type = types.package;
default = pkgs.kubernetes;
defaultText = "pkgs.kubernetes";
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};
verbose = mkOption {
description = "Kubernetes enable verbose mode for debugging";
default = false;
type = types.bool;
};
etcd = {
servers = mkOption {
description = "List of etcd servers. By default etcd is started, except if this option is changed.";
default = ["http://127.0.0.1:2379"];
type = types.listOf types.str;
};
keyFile = mkOption {
description = "Etcd key file";
default = null;
type = types.nullOr types.path;
};
certFile = mkOption {
description = "Etcd cert file";
default = null;
type = types.nullOr types.path;
};
caFile = mkOption {
description = "Etcd ca file";
default = null;
type = types.nullOr types.path;
};
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};
kubeconfig = {
server = mkOption {
description = "Kubernetes apiserver server address";
default = "http://${cfg.apiserver.address}:${toString cfg.apiserver.port}";
type = types.str;
};
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caFile = mkOption {
description = "Certificate authrority file to use to connect to kuberentes apiserver";
type = types.nullOr types.path;
default = null;
};
certFile = mkOption {
description = "Client certificate file to use to connect to kubernetes";
type = types.nullOr types.path;
default = null;
};
keyFile = mkOption {
description = "Client key file to use to connect to kubernetes";
type = types.nullOr types.path;
default = null;
};
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};
dataDir = mkOption {
description = "Kubernetes root directory for managing kubelet files.";
default = "/var/lib/kubernetes";
type = types.path;
};
apiserver = {
enable = mkOption {
description = "Whether to enable kubernetes apiserver.";
default = false;
type = types.bool;
};
address = mkOption {
description = "Kubernetes apiserver listening address.";
default = "127.0.0.1";
type = types.str;
};
publicAddress = mkOption {
description = ''
Kubernetes apiserver public listening address used for read only and
secure port.
'';
default = cfg.apiserver.address;
type = types.str;
};
advertiseAddress = mkOption {
description = ''
Kubernetes apiserver IP address on which to advertise the apiserver
to members of the cluster. This address must be reachable by the rest
of the cluster.
'';
default = null;
type = types.nullOr types.str;
};
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port = mkOption {
description = "Kubernetes apiserver listening port.";
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default = 8080;
type = types.int;
};
securePort = mkOption {
description = "Kubernetes apiserver secure port.";
default = 443;
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type = types.int;
};
tlsCertFile = mkOption {
description = "Kubernetes apiserver certificate file.";
default = null;
type = types.nullOr types.path;
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};
tlsKeyFile = mkOption {
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description = "Kubernetes apiserver private key file.";
default = null;
type = types.nullOr types.path;
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};
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clientCaFile = mkOption {
description = "Kubernetes apiserver CA file for client auth.";
default = null;
type = types.nullOr types.path;
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};
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tokenAuth = mkOption {
description = ''
Kubernetes apiserver token authentication file. See
<link xlink:href="http://kubernetes.io/docs/admin/authentication.html"/>
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'';
default = null;
example = ''token,user,uid,"group1,group2,group3"'';
type = types.nullOr types.lines;
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};
authorizationMode = mkOption {
description = ''
Kubernetes apiserver authorization mode (AlwaysAllow/AlwaysDeny/ABAC). See
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<link xlink:href="http://kubernetes.io/v1.0/docs/admin/authorization.html"/>
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'';
default = "AlwaysAllow";
type = types.enum ["AlwaysAllow" "AlwaysDeny" "ABAC"];
};
authorizationPolicy = mkOption {
description = ''
Kubernetes apiserver authorization policy file. See
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<link xlink:href="http://kubernetes.io/v1.0/docs/admin/authorization.html"/>
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'';
default = [];
example = literalExample ''
[
{user = "admin";}
{user = "scheduler"; readonly = true; kind= "pods";}
{user = "scheduler"; kind = "bindings";}
{user = "kubelet"; readonly = true; kind = "bindings";}
{user = "kubelet"; kind = "events";}
{user= "alice"; ns = "projectCaribou";}
{user = "bob"; readonly = true; ns = "projectCaribou";}
]
'';
type = types.listOf types.attrs;
};
allowPrivileged = mkOption {
description = "Whether to allow privileged containers on kubernetes.";
default = true;
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type = types.bool;
};
portalNet = mkOption {
description = "Kubernetes CIDR notation IP range from which to assign portal IPs";
default = "10.10.10.10/24";
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type = types.str;
};
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runtimeConfig = mkOption {
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description = ''
Api runtime configuration. See
<link xlink:href="http://kubernetes.io/v1.0/docs/admin/cluster-management.html"/>
'';
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default = "";
example = "api/all=false,api/v1=true";
type = types.str;
};
admissionControl = mkOption {
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description = ''
Kubernetes admission control plugins to use. See
<link xlink:href="http://kubernetes.io/docs/admin/admission-controllers/"/>
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'';
default = ["NamespaceLifecycle" "LimitRanger" "ServiceAccount" "ResourceQuota"];
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example = [
"NamespaceLifecycle" "NamespaceExists" "LimitRanger"
"SecurityContextDeny" "ServiceAccount" "ResourceQuota"
];
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type = types.listOf types.str;
};
serviceAccountKeyFile = mkOption {
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description = ''
Kubernetes apiserver PEM-encoded x509 RSA private or public key file,
used to verify ServiceAccount tokens. By default tls private key file
is used.
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'';
default = null;
type = types.nullOr types.path;
};
kubeletClientCaFile = mkOption {
description = "Path to a cert file for connecting to kubelet";
default = null;
type = types.nullOr types.path;
};
kubeletClientCertFile = mkOption {
description = "Client certificate to use for connections to kubelet";
default = null;
type = types.nullOr types.path;
};
kubeletClientKeyFile = mkOption {
description = "Key to use for connections to kubelet";
default = null;
type = types.nullOr types.path;
};
kubeletHttps = mkOption {
description = "Whether to use https for connections to kubelet";
default = true;
type = types.bool;
};
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extraOpts = mkOption {
description = "Kubernetes apiserver extra command line options.";
default = "";
type = types.str;
};
};
scheduler = {
enable = mkOption {
description = "Whether to enable kubernetes scheduler.";
default = false;
type = types.bool;
};
address = mkOption {
description = "Kubernetes scheduler listening address.";
default = "127.0.0.1";
type = types.str;
};
port = mkOption {
description = "Kubernetes scheduler listening port.";
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default = 10251;
type = types.int;
};
leaderElect = mkOption {
description = "Whether to start leader election before executing main loop";
type = types.bool;
default = false;
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};
extraOpts = mkOption {
description = "Kubernetes scheduler extra command line options.";
default = "";
type = types.str;
};
};
controllerManager = {
enable = mkOption {
description = "Whether to enable kubernetes controller manager.";
default = false;
type = types.bool;
};
address = mkOption {
description = "Kubernetes controller manager listening address.";
default = "127.0.0.1";
type = types.str;
};
port = mkOption {
description = "Kubernetes controller manager listening port.";
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default = 10252;
type = types.int;
};
leaderElect = mkOption {
description = "Whether to start leader election before executing main loop";
type = types.bool;
default = false;
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};
serviceAccountKeyFile = mkOption {
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description = ''
Kubernetes controller manager PEM-encoded private RSA key file used to
sign service account tokens
'';
default = null;
type = types.nullOr types.path;
};
rootCaFile = mkOption {
description = ''
Kubernetes controller manager certificate authority file included in
service account's token secret.
'';
default = null;
type = types.nullOr types.path;
};
clusterCidr = mkOption {
description = "Kubernetes controller manager CIDR Range for Pods in cluster";
default = "10.10.0.0/16";
type = types.str;
};
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extraOpts = mkOption {
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description = "Kubernetes controller manager extra command line options.";
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default = "";
type = types.str;
};
};
kubelet = {
enable = mkOption {
description = "Whether to enable kubernetes kubelet.";
default = false;
type = types.bool;
};
registerNode = mkOption {
description = "Whether to auto register kubelet with API server.";
default = true;
type = types.bool;
};
registerSchedulable = mkOption {
description = "Register the node as schedulable. No-op if register-node is false.";
default = true;
type = types.bool;
};
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address = mkOption {
description = "Kubernetes kubelet info server listening address.";
default = "0.0.0.0";
type = types.str;
};
port = mkOption {
description = "Kubernetes kubelet info server listening port.";
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default = 10250;
type = types.int;
};
tlsCertFile = mkOption {
description = "File containing x509 Certificate for HTTPS.";
default = null;
type = types.nullOr types.path;
};
tlsKeyFile = mkOption {
description = "File containing x509 private key matching tlsCertFile.";
default = null;
type = types.nullOr types.path;
};
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healthz = {
bind = mkOption {
description = "Kubernetes kubelet healthz listening address.";
default = "127.0.0.1";
type = types.str;
};
port = mkOption {
description = "Kubernetes kubelet healthz port.";
default = 10248;
type = types.int;
};
};
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hostname = mkOption {
description = "Kubernetes kubelet hostname override";
default = config.networking.hostName;
type = types.str;
};
allowPrivileged = mkOption {
description = "Whether to allow kubernetes containers to request privileged mode.";
default = true;
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type = types.bool;
};
cadvisorPort = mkOption {
description = "Kubernetes kubelet local cadvisor port.";
default = 4194;
type = types.int;
};
clusterDns = mkOption {
description = "Use alternative dns.";
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default = "10.10.0.1";
type = types.str;
};
clusterDomain = mkOption {
description = "Use alternative domain.";
default = "cluster.local";
type = types.str;
};
networkPlugin = mkOption {
description = "Network plugin to use by kubernetes";
type = types.nullOr (types.enum ["cni" "kubenet"]);
default = "kubenet";
};
cni = {
packages = mkOption {
description = "List of network plugin packages to install";
type = types.listOf types.package;
default = [];
};
config = mkOption {
description = "Kubernetes CNI configuration";
type = types.listOf types.attrs;
default = [];
example = literalExample ''
[{
"cniVersion": "0.2.0",
"name": "mynet",
"type": "bridge",
"bridge": "cni0",
"isGateway": true,
"ipMasq": true,
"ipam": {
"type": "host-local",
"subnet": "10.22.0.0/16",
"routes": [
{ "dst": "0.0.0.0/0" }
]
}
} {
"cniVersion": "0.2.0",
"type": "loopback"
}]
'';
};
};
manifests = mkOption {
description = "List of manifests to bootstrap with kubelet";
type = types.attrsOf types.attrs;
default = {};
};
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extraOpts = mkOption {
description = "Kubernetes kubelet extra command line options.";
default = "";
type = types.str;
};
};
proxy = {
enable = mkOption {
description = "Whether to enable kubernetes proxy.";
default = false;
type = types.bool;
};
address = mkOption {
description = "Kubernetes proxy listening address.";
default = "0.0.0.0";
type = types.str;
};
extraOpts = mkOption {
description = "Kubernetes proxy extra command line options.";
default = "";
type = types.str;
};
};
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dns = {
enable = mkEnableOption "kubernetes dns service.";
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port = mkOption {
description = "Kubernetes dns listening port";
default = 53;
type = types.int;
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};
domain = mkOption {
description = "Kuberntes dns domain under which to create names.";
default = cfg.kubelet.clusterDomain;
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type = types.str;
};
extraOpts = mkOption {
description = "Kubernetes dns extra command line options.";
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default = "";
type = types.str;
};
};
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};
###### implementation
config = mkMerge [
(mkIf cfg.kubelet.enable {
systemd.services.kubelet = {
description = "Kubernetes Kubelet Service";
wantedBy = [ "multi-user.target" ];
after = [ "network.target" "docker.service" "kube-apiserver.service" ];
path = with pkgs; [ gitMinimal openssh docker utillinux iproute ethtool thin-provisioning-tools iptables ];
preStart = ''
docker load < ${infraContainer}
rm /opt/cni/bin/* || true
${concatMapStringsSep "\n" (p: "ln -fs ${p.plugins}/* /opt/cni/bin") cfg.kubelet.cni.packages}
'';
serviceConfig = {
ExecStart = ''${cfg.package}/bin/kubelet \
--pod-manifest-path=${manifests} \
--kubeconfig=${kubeconfig} \
--require-kubeconfig \
--address=${cfg.kubelet.address} \
--port=${toString cfg.kubelet.port} \
--register-node=${if cfg.kubelet.registerNode then "true" else "false"} \
--register-schedulable=${if cfg.kubelet.registerSchedulable then "true" else "false"} \
${optionalString (cfg.kubelet.tlsCertFile != null)
"--tls-cert-file=${cfg.kubelet.tlsCertFile}"} \
${optionalString (cfg.kubelet.tlsKeyFile != null)
"--tls-private-key-file=${cfg.kubelet.tlsKeyFile}"} \
--healthz-bind-address=${cfg.kubelet.healthz.bind} \
--healthz-port=${toString cfg.kubelet.healthz.port} \
--hostname-override=${cfg.kubelet.hostname} \
--allow-privileged=${if cfg.kubelet.allowPrivileged then "true" else "false"} \
--root-dir=${cfg.dataDir} \
--cadvisor_port=${toString cfg.kubelet.cadvisorPort} \
${optionalString (cfg.kubelet.clusterDns != "")
"--cluster-dns=${cfg.kubelet.clusterDns}"} \
${optionalString (cfg.kubelet.clusterDomain != "")
"--cluster-domain=${cfg.kubelet.clusterDomain}"} \
--pod-infra-container-image=pause \
${optionalString (cfg.kubelet.networkPlugin != null)
"--network-plugin=${cfg.kubelet.networkPlugin}"} \
--cni-conf-dir=${cniConfig} \
--reconcile-cidr \
--hairpin-mode=hairpin-veth \
${optionalString cfg.verbose "--v=6 --log_flush_frequency=1s"} \
${cfg.kubelet.extraOpts}
'';
WorkingDirectory = cfg.dataDir;
};
};
environment.etc = mapAttrs' (name: manifest:
nameValuePair "kubernetes/manifests/${name}.json" {
text = builtins.toJSON manifest;
mode = "0755";
}
) cfg.kubelet.manifests;
# Allways include cni plugins
services.kubernetes.kubelet.cni.packages = [pkgs.cni];
})
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(mkIf cfg.apiserver.enable {
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systemd.services.kube-apiserver = {
description = "Kubernetes Kubelet Service";
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wantedBy = [ "multi-user.target" ];
after = [ "network.target" "docker.service" ];
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serviceConfig = {
ExecStart = ''${cfg.package}/bin/kube-apiserver \
--etcd-servers=${concatStringsSep "," cfg.etcd.servers} \
${optionalString (cfg.etcd.caFile != null)
"--etcd-cafile=${cfg.etcd.caFile}"} \
${optionalString (cfg.etcd.certFile != null)
"--etcd-certfile=${cfg.etcd.certFile}"} \
${optionalString (cfg.etcd.keyFile != null)
"--etcd-keyfile=${cfg.etcd.keyFile}"} \
--insecure-port=${toString cfg.apiserver.port} \
--bind-address=0.0.0.0 \
${optionalString (cfg.apiserver.advertiseAddress != null)
"--advertise-address=${cfg.apiserver.advertiseAddress}"} \
--allow-privileged=${if cfg.apiserver.allowPrivileged then "true" else "false"} \
${optionalString (cfg.apiserver.tlsCertFile != null)
"--tls-cert-file=${cfg.apiserver.tlsCertFile}"} \
${optionalString (cfg.apiserver.tlsKeyFile != null)
"--tls-private-key-file=${cfg.apiserver.tlsKeyFile}"} \
${optionalString (cfg.apiserver.tokenAuth != null)
"--token-auth-file=${cfg.apiserver.tokenAuth}"} \
--kubelet-https=${if cfg.apiserver.kubeletHttps then "true" else "false"} \
${optionalString (cfg.apiserver.kubeletClientCaFile != null)
"--kubelet-certificate-authority=${cfg.apiserver.kubeletClientCaFile}"} \
${optionalString (cfg.apiserver.kubeletClientCertFile != null)
"--kubelet-client-certificate=${cfg.apiserver.kubeletClientCertFile}"} \
${optionalString (cfg.apiserver.kubeletClientKeyFile != null)
"--kubelet-client-key=${cfg.apiserver.kubeletClientKeyFile}"} \
${optionalString (cfg.apiserver.clientCaFile != null)
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"--client-ca-file=${cfg.apiserver.clientCaFile}"} \
--authorization-mode=${cfg.apiserver.authorizationMode} \
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${optionalString (cfg.apiserver.authorizationMode == "ABAC")
"--authorization-policy-file=${policyFile}"} \
--secure-port=${toString cfg.apiserver.securePort} \
--service-cluster-ip-range=${cfg.apiserver.portalNet} \
${optionalString (cfg.apiserver.runtimeConfig != "")
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"--runtime-config=${cfg.apiserver.runtimeConfig}"} \
--admission_control=${concatStringsSep "," cfg.apiserver.admissionControl} \
${optionalString (cfg.apiserver.serviceAccountKeyFile!=null)
"--service-account-key-file=${cfg.apiserver.serviceAccountKeyFile}"} \
${optionalString cfg.verbose "--v=6"} \
${optionalString cfg.verbose "--log-flush-frequency=1s"} \
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${cfg.apiserver.extraOpts}
'';
WorkingDirectory = cfg.dataDir;
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User = "kubernetes";
Group = "kubernetes";
AmbientCapabilities = "cap_net_bind_service";
Restart = "on-failure";
RestartSec = 5;
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};
};
})
(mkIf cfg.scheduler.enable {
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systemd.services.kube-scheduler = {
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description = "Kubernetes Scheduler Service";
wantedBy = [ "multi-user.target" ];
after = [ "kube-apiserver.service" ];
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serviceConfig = {
ExecStart = ''${cfg.package}/bin/kube-scheduler \
--address=${cfg.scheduler.address} \
--port=${toString cfg.scheduler.port} \
--leader-elect=${if cfg.scheduler.leaderElect then "true" else "false"} \
--kubeconfig=${kubeconfig} \
${optionalString cfg.verbose "--v=6"} \
${optionalString cfg.verbose "--log-flush-frequency=1s"} \
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${cfg.scheduler.extraOpts}
'';
WorkingDirectory = cfg.dataDir;
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User = "kubernetes";
Group = "kubernetes";
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};
};
})
(mkIf cfg.controllerManager.enable {
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systemd.services.kube-controller-manager = {
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description = "Kubernetes Controller Manager Service";
wantedBy = [ "multi-user.target" ];
after = [ "kube-apiserver.service" ];
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serviceConfig = {
RestartSec = "30s";
Restart = "on-failure";
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ExecStart = ''${cfg.package}/bin/kube-controller-manager \
--address=${cfg.controllerManager.address} \
--port=${toString cfg.controllerManager.port} \
--kubeconfig=${kubeconfig} \
--leader-elect=${if cfg.controllerManager.leaderElect then "true" else "false"} \
${if (cfg.controllerManager.serviceAccountKeyFile!=null)
then "--service-account-private-key-file=${cfg.controllerManager.serviceAccountKeyFile}"
else "--service-account-private-key-file=/var/run/kubernetes/apiserver.key"} \
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${optionalString (cfg.controllerManager.rootCaFile!=null)
"--root-ca-file=${cfg.controllerManager.rootCaFile}"} \
${optionalString (cfg.controllerManager.clusterCidr!=null)
"--cluster-cidr=${cfg.controllerManager.clusterCidr}"} \
--allocate-node-cidrs=true \
${optionalString cfg.verbose "--v=6"} \
${optionalString cfg.verbose "--log-flush-frequency=1s"} \
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${cfg.controllerManager.extraOpts}
'';
WorkingDirectory = cfg.dataDir;
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User = "kubernetes";
Group = "kubernetes";
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};
};
})
(mkIf cfg.proxy.enable {
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systemd.services.kube-proxy = {
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description = "Kubernetes Proxy Service";
wantedBy = [ "multi-user.target" ];
after = [ "kube-apiserver.service" ];
path = [pkgs.iptables];
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serviceConfig = {
ExecStart = ''${cfg.package}/bin/kube-proxy \
--kubeconfig=${kubeconfig} \
--bind-address=${cfg.proxy.address} \
${optionalString cfg.verbose "--v=6"} \
${optionalString cfg.verbose "--log-flush-frequency=1s"} \
${cfg.proxy.extraOpts}
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'';
WorkingDirectory = cfg.dataDir;
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};
};
})
(mkIf cfg.dns.enable {
systemd.services.kube-dns = {
description = "Kubernetes Dns Service";
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wantedBy = [ "multi-user.target" ];
after = [ "kube-apiserver.service" ];
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serviceConfig = {
ExecStart = ''${cfg.package}/bin/kube-dns \
--kubecfg-file=${kubeconfig} \
--dns-port=${toString cfg.dns.port} \
--domain=${cfg.dns.domain} \
${optionalString cfg.verbose "--v=6"} \
${optionalString cfg.verbose "--log-flush-frequency=1s"} \
${cfg.dns.extraOpts}
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'';
WorkingDirectory = cfg.dataDir;
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User = "kubernetes";
Group = "kubernetes";
AmbientCapabilities = "cap_net_bind_service";
SendSIGHUP = true;
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};
};
})
(mkIf cfg.kubelet.enable {
boot.kernelModules = ["br_netfilter"];
})
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(mkIf (any (el: el == "master") cfg.roles) {
virtualisation.docker.enable = mkDefault true;
services.kubernetes.kubelet.enable = mkDefault true;
services.kubernetes.kubelet.allowPrivileged = mkDefault true;
services.kubernetes.apiserver.enable = mkDefault true;
services.kubernetes.scheduler.enable = mkDefault true;
services.kubernetes.controllerManager.enable = mkDefault true;
services.etcd.enable = mkDefault (cfg.etcd.servers == ["http://127.0.0.1:2379"]);
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})
(mkIf (any (el: el == "node") cfg.roles) {
virtualisation.docker.enable = mkDefault true;
virtualisation.docker.logDriver = mkDefault "json-file";
services.kubernetes.kubelet.enable = mkDefault true;
services.kubernetes.proxy.enable = mkDefault true;
services.kubernetes.dns.enable = mkDefault true;
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})
(mkIf (
cfg.apiserver.enable ||
cfg.scheduler.enable ||
cfg.controllerManager.enable ||
cfg.kubelet.enable ||
cfg.proxy.enable ||
cfg.dns.enable
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) {
systemd.tmpfiles.rules = [
"d /opt/cni/bin 0755 root root -"
"d /var/run/kubernetes 0755 kubernetes kubernetes -"
"d /var/lib/kubernetes 0755 kubernetes kubernetes -"
];
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environment.systemPackages = [ cfg.package ];
users.extraUsers = singleton {
name = "kubernetes";
uid = config.ids.uids.kubernetes;
description = "Kubernetes user";
extraGroups = [ "docker" ];
group = "kubernetes";
home = cfg.dataDir;
createHome = true;
};
users.extraGroups.kubernetes.gid = config.ids.gids.kubernetes;
})
];
}