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Cleanup pki: addon-manager

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This commit is contained in:
Christian Albrecht 2019-03-11 10:44:24 +01:00
parent 154356d820
commit ee9dd4386a
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2 changed files with 76 additions and 59 deletions
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77
nixos/modules/services/cluster/kubernetes/addon-manager.nix
View file

@ -63,24 +63,48 @@ in
};
enable = mkEnableOption "Whether to enable Kubernetes addon manager.";
kubeconfig = top.lib.mkKubeConfigOptions "Kubernetes addon manager";
bootstrapAddonsKubeconfig = top.lib.mkKubeConfigOptions "Kubernetes addon manager bootstrap";
};
###### implementation
config = mkIf cfg.enable {
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 = [ "kube-control-plane-online.target" ];
after = [ "kube-addon-manager-bootstrap.service" ];
before = [ "kube-control-plane-online.target" ];
environment.ADDON_PATH = "/etc/kubernetes/addons/";
path = [ pkgs.gawk ];
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 = ''
${top.lib.mkWaitCurl ( with config.systemd.services.kube-addon-manager; {
path = "/api/v1/namespaces/kube-system/serviceaccounts/default";
cacert = top.caFile;
} // optionalAttrs (environment ? cert) { inherit (environment) cert key; })}
until kubectl -n kube-system get serviceaccounts/default 2>/dev/null; do
echo kubectl -n kube-system get serviceaccounts/default: exit status $?
sleep 2
done
'';
serviceConfig = {
Slice = "kubernetes.slice";
@ -91,27 +115,52 @@ in
Restart = "on-failure";
RestartSec = 10;
};
unitConfig.ConditionPathExists = addonManagerPaths;
};
systemd.paths.kube-addon-manager = {
wantedBy = [ "kube-addon-manager.service" ];
pathConfig = {
PathExists = addonManagerPaths;
PathChanged = addonManagerPaths;
};
};
services.kubernetes.addonManager.kubeconfig.server = mkDefault top.apiserverAddress;
systemd.services.kube-addon-manager-bootstrap = mkIf (top.apiserver.enable && top.addonManager.bootstrapAddons != {}) {
wantedBy = [ "kube-control-plane-online.target" ];
after = [ "kube-apiserver.service" ];
before = [ "kube-control-plane-online.target" ];
path = [ pkgs.kubectl ];
environment = {
KUBECONFIG = top.lib.mkKubeConfig "kube-addon-manager-bootstrap" cfg.bootstrapAddonsKubeconfig;
};
preStart = with pkgs; let
files = mapAttrsToList (n: v: writeText "${n}.json" (builtins.toJSON v))
cfg.bootstrapAddons;
in ''
${top.lib.mkWaitCurl ( with config.systemd.services.kube-addon-manager-bootstrap; {
path = "/api";
cacert = top.caFile;
} // optionalAttrs (environment ? cert) { inherit (environment) cert key; })}
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;

58
nixos/modules/services/cluster/kubernetes/pki.nix
View file

@ -27,12 +27,11 @@ let
certmgrAPITokenPath = "${top.secretsPath}/${cfsslAPITokenBaseName}";
cfsslAPITokenLength = 32;
clusterAdminKubeconfig = with cfg.certs.clusterAdmin;
top.lib.mkKubeConfig "cluster-admin" {
server = top.apiserverAddress;
certFile = cert;
keyFile = key;
};
clusterAdminKubeconfig = with cfg.certs.clusterAdmin; {
server = top.apiserverAddress;
certFile = cert;
keyFile = key;
};
remote = with config.services; "https://${kubernetes.masterAddress}:${toString cfssl.port}";
in
@ -142,12 +141,6 @@ in
config.services.etcd.keyFile
config.services.etcd.trustedCaFile
];
addonManagerPaths = mkIf top.addonManager.enable [
cfg.certs.addonManager.cert
cfg.certs.addonManager.key
cfg.certs.clusterAdmin.cert
cfg.certs.clusterAdmin.key
];
flannelPaths = [
cfg.certs.flannelClient.cert
cfg.certs.flannelClient.key
@ -331,38 +324,6 @@ in
};
};
systemd.services.kube-addon-manager-bootstrap = mkIf (top.apiserver.enable && top.addonManager.bootstrapAddons != {}) {
environment = {
KUBECONFIG = clusterAdminKubeconfig;
inherit (cfg.certs.clusterAdmin) cert key;
};
};
#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 = mkIf top.addonManager.enable {
environment = with cfg.certs.addonManager; {
KUBECONFIG = top.lib.mkKubeConfig "kube-addon-manager" {
server = top.apiserverAddress;
certFile = cert;
keyFile = key;
};
inherit cert key;
};
unitConfig.ConditionPathExists = addonManagerPaths;
};
systemd.paths.kube-addon-manager = mkIf top.addonManager.enable {
wantedBy = [ "kube-addon-manager.service" ];
pathConfig = {
PathExists = addonManagerPaths;
PathChanged = addonManagerPaths;
};
};
systemd.services.kube-controller-manager = mkIf top.controllerManager.enable {
environment = { inherit (cfg.certs.controllerManagerClient) cert key; };
unitConfig.ConditionPathExists = controllerManagerPaths;
@ -396,7 +357,7 @@ in
};
environment.etc.${cfg.etcClusterAdminKubeconfig}.source = mkIf (!isNull cfg.etcClusterAdminKubeconfig)
clusterAdminKubeconfig;
(top.lib.mkKubeConfig "cluster-admin" clusterAdminKubeconfig);
environment.systemPackages = mkIf (top.kubelet.enable || top.proxy.enable) [
(pkgs.writeScriptBin "nixos-kubernetes-node-join" ''
@ -538,6 +499,13 @@ in
kubeletClientCertFile = mkDefault cfg.certs.apiserverKubeletClient.cert;
kubeletClientKeyFile = mkDefault cfg.certs.apiserverKubeletClient.key;
});
addonManager = mkIf top.addonManager.enable {
kubeconfig = with cfg.certs.addonManager; {
certFile = mkDefault cert;
keyFile = mkDefault key;
};
bootstrapAddonsKubeconfig = clusterAdminKubeconfig;
};
controllerManager = mkIf top.controllerManager.enable {
serviceAccountKeyFile = mkDefault cfg.certs.serviceAccount.key;
rootCaFile = cfg.certs.controllerManagerClient.caCert;