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{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.flannel;
networkConfig = filterAttrs (n: v: v != null) {
Network = cfg.network;
SubnetLen = cfg.subnetLen;
SubnetMin = cfg.subnetMin;
SubnetMax = cfg.subnetMax;
Backend = cfg.backend;
};
in {
options.services.flannel = {
enable = mkEnableOption "flannel";
package = mkOption {
description = "Package to use for flannel";
type = types.package;
default = pkgs.flannel;
defaultText = "pkgs.flannel";
};
publicIp = mkOption {
description = ''
IP accessible by other nodes for inter-host communication.
Defaults to the IP of the interface being used for communication.
'';
type = types.nullOr types.str;
default = null;
};
iface = mkOption {
description = ''
Interface to use (IP or name) for inter-host communication.
Defaults to the interface for the default route on the machine.
'';
type = types.nullOr types.str;
default = null;
};
etcd = {
endpoints = mkOption {
description = "Etcd endpoints";
type = types.listOf types.str;
default = ["http://127.0.0.1:2379"];
};
prefix = mkOption {
description = "Etcd key prefix";
type = types.str;
default = "/coreos.com/network";
};
caFile = mkOption {
description = "Etcd certificate authority file";
type = types.nullOr types.path;
default = null;
};
certFile = mkOption {
description = "Etcd cert file";
type = types.nullOr types.path;
default = null;
};
keyFile = mkOption {
description = "Etcd key file";
type = types.nullOr types.path;
default = null;
};
};
kubeconfig = mkOption {
description = ''
Path to kubeconfig to use for storing flannel config using the
Kubernetes API
'';
type = types.nullOr types.path;
default = null;
};
network = mkOption {
description = " IPv4 network in CIDR format to use for the entire flannel network.";
type = types.str;
};
nodeName = mkOption {
description = ''
Needed when running with Kubernetes as backend as this cannot be auto-detected";
'';
type = types.nullOr types.str;
default = with config.networking; (hostName + optionalString (domain != null) ".${domain}");
example = "node1.example.com";
};
storageBackend = mkOption {
description = "Determines where flannel stores its configuration at runtime";
type = types.enum ["etcd" "kubernetes"];
default = "etcd";
};
subnetLen = mkOption {
description = ''
The size of the subnet allocated to each host. Defaults to 24 (i.e. /24)
unless the Network was configured to be smaller than a /24 in which case
it is one less than the network.
'';
type = types.int;
default = 24;
};
subnetMin = mkOption {
description = ''
The beginning of IP range which the subnet allocation should start with.
Defaults to the first subnet of Network.
'';
type = types.nullOr types.str;
default = null;
};
subnetMax = mkOption {
description = ''
The end of IP range which the subnet allocation should start with.
Defaults to the last subnet of Network.
'';
type = types.nullOr types.str;
default = null;
};
backend = mkOption {
description = "Type of backend to use and specific configurations for that backend.";
type = types.attrs;
default = {
Type = "vxlan";
};
};
};
config = mkIf cfg.enable {
systemd.services.flannel = {
description = "Flannel Service";
wantedBy = [ "multi-user.target" ];
after = [ "network.target" ];
environment = {
FLANNELD_PUBLIC_IP = cfg.publicIp;
FLANNELD_IFACE = cfg.iface;
} // optionalAttrs (cfg.storageBackend == "etcd") {
FLANNELD_ETCD_ENDPOINTS = concatStringsSep "," cfg.etcd.endpoints;
FLANNELD_ETCD_KEYFILE = cfg.etcd.keyFile;
FLANNELD_ETCD_CERTFILE = cfg.etcd.certFile;
FLANNELD_ETCD_CAFILE = cfg.etcd.caFile;
ETCDCTL_CERT_FILE = cfg.etcd.certFile;
ETCDCTL_KEY_FILE = cfg.etcd.keyFile;
ETCDCTL_CA_FILE = cfg.etcd.caFile;
ETCDCTL_PEERS = concatStringsSep "," cfg.etcd.endpoints;
} // optionalAttrs (cfg.storageBackend == "kubernetes") {
FLANNELD_KUBE_SUBNET_MGR = "true";
FLANNELD_KUBECONFIG_FILE = cfg.kubeconfig;
NODE_NAME = cfg.nodeName;
};
path = [ pkgs.iptables ];
preStart = ''
mkdir -p /run/flannel
touch /run/flannel/docker
'' + optionalString (cfg.storageBackend == "etcd") ''
echo "setting network configuration"
until ${pkgs.etcdctl}/bin/etcdctl set /coreos.com/network/config '${builtins.toJSON networkConfig}'
do
echo "setting network configuration, retry"
sleep 1
done
'';
serviceConfig = {
ExecStart = "${cfg.package}/bin/flannel";
Restart = "always";
RestartSec = "10s";
};
};
services.etcd.enable = mkDefault (cfg.storageBackend == "etcd" && cfg.etcd.endpoints == ["http://127.0.0.1:2379"]);
# for some reason, flannel doesn't let you configure this path
# see: https://github.com/coreos/flannel/blob/master/Documentation/configuration.md#configuration
environment.etc."kube-flannel/net-conf.json" = mkIf (cfg.storageBackend == "kubernetes") {
source = pkgs.writeText "net-conf.json" (builtins.toJSON networkConfig);
};
};
}
|