blob: d9437427d6d1af488cecd9ec29dff9068f328e87 (
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
|
{ config, lib, pkgs, ... }:
with lib;
let
top = config.services.kubernetes;
cfg = top.flannel;
# we want flannel to use kubernetes itself as configuration backend, not direct etcd
storageBackend = "kubernetes";
# needed for flannel to pass options to docker
mkDockerOpts = pkgs.runCommand "mk-docker-opts" {
buildInputs = [ pkgs.makeWrapper ];
} ''
mkdir -p $out
cp ${pkgs.kubernetes.src}/cluster/centos/node/bin/mk-docker-opts.sh $out/mk-docker-opts.sh
# bashInteractive needed for `compgen`
makeWrapper ${pkgs.bashInteractive}/bin/bash $out/mk-docker-opts --add-flags "$out/mk-docker-opts.sh"
'';
in
{
###### interface
options.services.kubernetes.flannel = {
enable = mkEnableOption "flannel networking";
kubeconfig = top.lib.mkKubeConfigOptions "Kubernetes flannel";
};
###### implementation
config = let
flannelPaths = filter (a: a != null) [
cfg.kubeconfig.caFile
cfg.kubeconfig.certFile
cfg.kubeconfig.keyFile
];
kubeconfig = top.lib.mkKubeConfig "flannel" cfg.kubeconfig;
in mkIf cfg.enable {
services.flannel = {
enable = mkDefault true;
network = mkDefault top.clusterCidr;
inherit storageBackend kubeconfig;
nodeName = top.kubelet.hostname;
};
services.kubernetes.kubelet = {
networkPlugin = mkDefault "cni";
cni.config = mkDefault [{
name = "mynet";
type = "flannel";
delegate = {
isDefaultGateway = true;
bridge = "docker0";
};
}];
};
systemd.services.mk-docker-opts = {
description = "Pre-Docker Actions";
wantedBy = [ "flannel.target" ];
before = [ "flannel.target" ];
path = with pkgs; [ gawk gnugrep ];
script = ''
${mkDockerOpts}/mk-docker-opts -d /run/flannel/docker
systemctl restart docker
'';
unitConfig.ConditionPathExists = [ "/run/flannel/subnet.env" ];
serviceConfig.Type = "oneshot";
};
systemd.paths.flannel-subnet-env = {
wantedBy = [ "mk-docker-opts.service" ];
pathConfig = {
PathExists = [ "/run/flannel/subnet.env" ];
PathChanged = [ "/run/flannel/subnet.env" ];
Unit = "mk-docker-opts.service";
};
};
systemd.targets.flannel = {
wantedBy = [ "kube-node-online.target" ];
before = [ "kube-node-online.target" ];
};
systemd.services.flannel = {
wantedBy = [ "flannel.target" ];
after = [ "kubelet.target" ];
before = [ "flannel.target" ];
path = with pkgs; [ iptables kubectl ];
environment.KUBECONFIG = kubeconfig;
preStart = let
args = [
"--selector=kubernetes.io/hostname=${top.kubelet.hostname}"
# flannel exits if node is not registered yet, before that there is no podCIDR
"--output=jsonpath={.items[0].spec.podCIDR}"
# if jsonpath cannot be resolved exit with status 1
"--allow-missing-template-keys=false"
];
in ''
until kubectl get nodes ${concatStringsSep " " args} 2>/dev/null; do
echo Waiting for ${top.kubelet.hostname} to be RegisteredNode
sleep 1
done
'';
unitConfig.ConditionPathExists = flannelPaths;
};
systemd.paths.flannel = {
wantedBy = [ "flannel.service" ];
pathConfig = {
PathExists = flannelPaths;
PathChanged = flannelPaths;
};
};
services.kubernetes.flannel.kubeconfig.server = mkDefault top.apiserverAddress;
systemd.services.docker = {
environment.DOCKER_OPTS = "-b none";
serviceConfig.EnvironmentFile = "-/run/flannel/docker";
};
# read environment variables generated by mk-docker-opts
virtualisation.docker.extraOptions = "$DOCKER_OPTS";
networking = {
firewall.allowedUDPPorts = [
8285 # flannel udp
8472 # flannel vxlan
];
dhcpcd.denyInterfaces = [ "docker*" "flannel*" ];
};
services.kubernetes.pki.certs = {
flannelClient = top.lib.mkCert {
name = "flannel-client";
CN = "flannel-client";
action = "systemctl restart flannel.service";
};
};
# give flannel som kubernetes rbac permissions if applicable
services.kubernetes.addonManager.bootstrapAddons = mkIf ((storageBackend == "kubernetes") && (elem "RBAC" top.apiserver.authorizationMode)) {
flannel-cr = {
apiVersion = "rbac.authorization.k8s.io/v1beta1";
kind = "ClusterRole";
metadata = { name = "flannel"; };
rules = [{
apiGroups = [ "" ];
resources = [ "pods" ];
verbs = [ "get" ];
}
{
apiGroups = [ "" ];
resources = [ "nodes" ];
verbs = [ "list" "watch" ];
}
{
apiGroups = [ "" ];
resources = [ "nodes/status" ];
verbs = [ "patch" ];
}];
};
flannel-crb = {
apiVersion = "rbac.authorization.k8s.io/v1beta1";
kind = "ClusterRoleBinding";
metadata = { name = "flannel"; };
roleRef = {
apiGroup = "rbac.authorization.k8s.io";
kind = "ClusterRole";
name = "flannel";
};
subjects = [{
kind = "User";
name = "flannel-client";
}];
};
};
};
}
|