Fix dynamic DNS retries and e-mail alert throttling

1 files changed, 8 insertions, 4 deletions

diff --git a/hostnix/elmo/dyndns.nix b/hostnix/elmo/dyndns.nix
index 5abe98c..33ce19d 100644
--- a/hostnix/elmo/dyndns.nix
+++ b/hostnix/elmo/dyndns.nix
@@ -27,15 +27,19 @@
     after = [ "network-online.target" ];
     unitConfig = {
       AssertPathExists = "/var/secrets/dyndns";
-      # Defer errors for ~45min, throttle e-mails to ~hourly.
-      StartLimitIntervalSec = "1hr";
-      StartLimitBurst = "45";
+      # Retry ~3min before giving up.
+      StartLimitIntervalSec = "5min";
+      StartLimitBurst = "7";
       OnFailure = "status-email@%n.service";
     };
     serviceConfig = {
       Type = "oneshot";
       Restart = "on-failure";
-      RestartSec = "1min";
+      # Restart must be faster than the regular timer interval to exceed the
+      # start limit when flapping.
+      RestartSec = "30";
+      # Defer OnFailure until after retries.
+      RestartMode = "direct";
     };
     path = [ pkgs.dnsutils pkgs.gawk pkgs.iproute2 ];
     scriptArgs = config.networking.fqdn;