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nixos/kubernetes: use system.path to handle dependency on flannel subnet.env

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The current postStart step on flannel causes flannel.service to
sometimes hang, even when it's commanded to stop.
This commit is contained in:
Johan Thomsen 2019-02-14 10:28:51 +01:00 committed by Franz Pletz
parent 466beb0214
commit 7028fac35b
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GPG Key ID: 846FDED7792617B4
2 changed files with 19 additions and 12 deletions
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14
nixos/modules/services/cluster/kubernetes/flannel.nix
View File

@ -50,16 +50,22 @@ in
systemd.services."mk-docker-opts" = {
description = "Pre-Docker Actions";
wantedBy = [ "flannel.service" ];
before = [ "docker.service" ];
after = [ "flannel.service" ];
path = with pkgs; [ gawk gnugrep ];
script = ''
mkdir -p /run/flannel
${mkDockerOpts}/mk-docker-opts -d /run/flannel/docker
systemctl restart docker
'';
serviceConfig.Type = "oneshot";
};
systemd.paths."flannel-subnet-env" = {
wantedBy = [ "flannel.service" ];
pathConfig = {
PathModified = "/run/flannel/subnet.env";
Unit = "mk-docker-opts.service";
};
};
systemd.services.docker.serviceConfig.EnvironmentFile = "/run/flannel/docker";
# read environment variables generated by mk-docker-opts

17
nixos/modules/services/networking/flannel.nix
View File

@ -161,7 +161,10 @@ in {
FLANNELD_KUBECONFIG_FILE = cfg.kubeconfig;
NODE_NAME = cfg.nodeName;
};
preStart = mkIf (cfg.storageBackend == "etcd") ''
preStart = ''
mkdir -p /run/flannel
touch /run/flannel/docker
'' + optionalString (cfg.storageBackend == "etcd") ''
echo "setting network configuration"
until ${pkgs.etcdctl.bin}/bin/etcdctl set /coreos.com/network/config '${builtins.toJSON networkConfig}'
do
@ -169,13 +172,11 @@ in {
sleep 1
done
'';
postStart = ''
while [ ! -f /run/flannel/subnet.env ]
do
sleep 1
done
'';
serviceConfig.ExecStart = "${cfg.package}/bin/flannel";
serviceConfig = {
ExecStart = "${cfg.package}/bin/flannel";
Restart = "always";
RestartSec = "10s";
};
};
services.etcd.enable = mkDefault (cfg.storageBackend == "etcd" && cfg.etcd.endpoints == ["http://127.0.0.1:2379"]);