nixos/nats: Shut down gracefully, and prevent automatic restart on deliberate stop

SIGUSR2 puts nats-server into "lame-duck mode", where the node hands off leader roles and hands clients off to other nodes.
2025-10-19 06:55:48 -05:00
parent 63bdb5d90f
commit 889b866c82
1 changed files with 9 additions and 1 deletions
@@ -138,7 +138,15 @@ in
          Type = "simple";
          ExecStart = "${pkgs.nats-server}/bin/nats-server -c ${configFile}";
          ExecReload = "${pkgs.coreutils}/bin/kill -HUP $MAINPID";
-          ExecStop = "${pkgs.coreutils}/bin/kill -SIGINT $MAINPID";
+
+          KillMode = "mixed";
+          KillSignal = "SIGUSR2";
+          SuccessExitStatus = [
+            0
+            "SIGUSR2"
+          ];
+
+          TimeoutStopSec = "150"; # must exceed lame_duck_duration, which defaults to 2min
          Restart = "on-failure";

          User = cfg.user;