changed the service of systemd file a bit and added the help flag output as help to readme

README.md

@@ -1,3 +1,35 @@
 # dns failover
 
 a project written in go by db123 to check the iran server availability and if there was any problem change the bind9 dns config contents.
+
+## help
+
+```bash
+./dns-failover -h
+Usage of ./dns-failover:
+  -active-conf string
+    	Active zone config path (default "/etc/bind/db.active")
+  -domain string
+    	Domain for HTTPS SNI/Host
+  -fail-interval duration
+    	Interval during failure detection (default 10s)
+  -failover-conf string
+    	Failover zone config (default "/etc/bind/db.failover")
+  -https
+    	Use HTTPS
+  -interval duration
+    	Normal check interval (default 2m0s)
+  -ip string
+    	Static IP to check
+  -port string
+    	Port to check (default "80")
+  -primary-conf string
+    	Primary zone config (default "/etc/bind/db.primary")
+  -retries int
+    	Consecutive retries before state change (default 5)
+  -timeout duration
+    	HTTP timeout (default 5s)
+  -url string
+    	Health endpoint path (default "/nginx-health")
+  -v	Verbose logging
+```

dns-failover.service

@@ -3,7 +3,7 @@ Description=DNS Failover Watchdog by db123
 After=network.target
 
 [Service]
-ExecStart=/usr/local/bin/dns-failover -ip <ip> -v
+ExecStart=/root/infra/dns-failover/dns-failover -ip <server-to-watch>
 Restart=always
 RestartSec=5
 User=root