From cab6c197d4a1756a84afa113f8c5377db73f1fbe Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=9B=B2=E8=B1=B9=20=CE=A6=CF=89=CE=A6?=
 <work@nebulosa-cat.com>
Date: Thu, 26 Mar 2026 05:44:59 +0800
Subject: [PATCH] feat: add auto-restart policy with failure threshold for
 systemd service

Enable Restart=on-failure with a 5-second delay.

Implement a safety limit: stop restarting if the service fails more than 5 times within 1 minute.

Prevent infinite crash loops and resource exhaustion.
---
 src/chronotron.service | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/chronotron.service b/src/chronotron.service
index fa19b7b..e1a1908 100644
--- a/src/chronotron.service
+++ b/src/chronotron.service
@@ -2,6 +2,11 @@
 Description=Display chrony statistics on 4x20 LCD
 After=network.target
 
+//If in 1 min fail more then 5 times, stop restart service.
+StartLimitIntervalSec=60s
+StartLimitBurst=5
+
+
 [Service]
 Type=simple
 User=root
@@ -10,6 +15,9 @@ WorkingDirectory=/opt/chronotron
 ExecStart=/opt/chronotron/chronotron.py
 StandardOutput=syslog
 StandardError=syslog
+//If service fail, auto restart after 5 sec
+Restart=on-failure
+RestartSec=5s
 
 [Install]
 WantedBy=multi-user.target