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nixos/flannel: add options to configure kubernetes as config backend for flannel

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This commit is contained in:
Johan Thomsen 2019-02-11 13:47:45 +01:00
parent 67efb6f14c
commit 9522ca5ce9
1 changed files with 28 additions and 3 deletions
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31
nixos/modules/services/networking/flannel.nix
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@ -73,11 +73,26 @@ in {
};
};
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;
};
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)
@ -122,17 +137,21 @@ in {
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;
FLANNELD_IFACE = cfg.iface;
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;
};
preStart = ''
preStart = mkIf (cfg.storageBackend == "etcd") ''
echo "setting network configuration"
until ${pkgs.etcdctl.bin}/bin/etcdctl set /coreos.com/network/config '${builtins.toJSON networkConfig}'
do
@ -149,6 +168,12 @@ in {
serviceConfig.ExecStart = "${cfg.package}/bin/flannel";
};
services.etcd.enable = mkDefault (cfg.etcd.endpoints == ["http://127.0.0.1:2379"]);
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);
};
};
}