blob: b9a56811d2bd84f9d1b5986613ba1d36730885e5 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
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 "Whether to enable 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";
};
};
};
}
|