Add SERVER_HOST Environment in mc-monitor command (#2875)

bin/mc-health

@@ -13,6 +13,6 @@ elif isTrue "${ENABLE_AUTOPAUSE}" && [[ "$( ps -ax -o stat,comm | grep 'java' |
   echo "Java process suspended by Autopause function"
   exit 0
 else
-  mc-monitor status "${MC_HEALTH_EXTRA_ARGS[@]}" --host localhost --port "${SERVER_PORT:-25565}"
+  mc-monitor status "${MC_HEALTH_EXTRA_ARGS[@]}" --host "${SERVER_HOST:-localhost}" --port "${SERVER_PORT:-25565}"
   exit $?
 fi

docs/configuration/misc-options.md

@@ -55,6 +55,14 @@ To allow time for players to finish what they're doing during a graceful server
     
     The grace period can be increased using [the -t option on docker-compose down](https://docs.docker.com/compose/reference/down/) or set the [stop_grace_period](https://docs.docker.com/compose/compose-file/05-services/#stop_grace_period) in the compose file.
 
+## Configuration Options for Minecraft Server Health Monitoring
+
+The image tags include specific variables to simplify configuration for monitoring the health of a Minecraft server:
+
+- `-e SERVER_HOST=localhost` : This variable sets the host address of the Minecraft server to be monitored. By default, it is set to `localhost`, but you can replace it with the actual hostname or IP address of your Minecraft server.
+
+- `-e SERVER_PORT=25565` : This variable sets the port number on which the Minecraft server is running. By default, Minecraft servers run on port 25565, but if your server is configured to use a different port, you should replace `25565` with the correct port number. This helps the monitoring system to accurately check the health status of the Minecraft server on the specified port.
+
 ## OpenJ9 Specific Options
 
 The openj9 image tags include specific variables to simplify configuration:

files/auto/autopause-fcns.sh

@@ -17,13 +17,13 @@ rcon_client_exists() {
 }
 
 mc_server_listening() {
-  mc-monitor status --host localhost --port "$SERVER_PORT" --timeout 10s >& /dev/null
+  mc-monitor status --host "${SERVER_HOST:-localhost}" --port "$SERVER_PORT" --timeout 10s >& /dev/null
 }
 
 java_clients_connections() {
   local connections
   if java_running ; then
-    if ! connections=$(mc-monitor status --host localhost --port "$SERVER_PORT" --show-player-count); then
+    if ! connections=$(mc-monitor status --host "${SERVER_HOST:-localhost}" --port "$SERVER_PORT" --show-player-count); then
       # consider it a non-zero player count if the ping fails
       # otherwise a laggy server with players connected could get paused
       connections=1