Skip to main content
Super User

Return to Question

Post Timeline

added 1522 characters in body
Source Link
Th1sD0t
Th1sD0t
  • 123
  • 1
  • 6

I'm building up my linux knowledge (at least I'm trying) by setting up services for different game servers.

Currently I'm working on a Minecraft Server that shall be started automatically on a server restart. Everything seems to work but I assume the way I'm terminating the server on stop command is not the best one.

That's the current unit file:

[Unit]
Description=Minecraft Dedicated Server
After=network.service

[Service]
User=user
Group=user_group
Type=simple
WorkingDirectory=/usr/local/bin/services/minecraft/
ExecStart=/usr/local/bin/services/minecraft/run.sh
ExecStop=/bin/kill -9 $MAINPID
RestartSec=15
Restart=on-failure

[Install]
WantedBy=multi-user.target

I've read that simply using the kill command will not terminate the server gracefully and one should use the minecraft-internal "stop" command instead. Unfortunately I could not figure out how to modify the ExecStop command to send internal commands to the minecraft process.

EDIT:

The following has been implemented:

minecraft.service:

[Unit]
Description=Minecraft Dedicated Server
After=network.service

[Service]
User=user
Group=user_group
Type=simple
KillSignal=SIGCONT
Sockets=minecraft.socket
WorkingDirectory=/usr/local/bin/services/minecraft/
ExecStart=/bin/sh -c "java -Xms2G -Xmx4G -XX:+UseConcMarkSweepGC -jar spigot-1.14.4.jar < /run/minecraft.control"
ExecStop=/bin/sh -c "echo /stop > /run/minecraft.control"
RestartSec=15
Restart=on-failure

[Install]
WantedBy=multi-user.target

minecraft.socket:

[Unit]
BindsTo=minecraft.service

[Socket]
ListenFIFO=/run/minecraft.control
RemoveOnStop=true
sockeSocketMode=0664
SocketUser=user
SocketGroup=user_group

Unfortunately, the commands passed through the minecraft.control fifo do not work.

I observed the following behavior: When sending a command using

echo "/help" > /run/minecraft.control

sometimes gives me an output when viewing the minecraft.control fifo (with cat) and sometimes not. If there's no output in the fifo, the journal of the minecraft.service unit displays Unknown command. Type "/help" for help. although I've sent "/help" as command. Additionally, the unit's ExecStop command

echo "/stop" > /run/minecraft.control

does not work either and the server gets killed by the sigkill signal instead.

Any idea why this does not work?

I'm building up my linux knowledge (at least I'm trying) by setting up services for different game servers.

Currently I'm working on a Minecraft Server that shall be started automatically on a server restart. Everything seems to work but I assume the way I'm terminating the server on stop command is not the best one.

That's the current unit file:

[Unit]
Description=Minecraft Dedicated Server
After=network.service

[Service]
User=user
Group=user_group
Type=simple
WorkingDirectory=/usr/local/bin/services/minecraft/
ExecStart=/usr/local/bin/services/minecraft/run.sh
ExecStop=/bin/kill -9 $MAINPID
RestartSec=15
Restart=on-failure

[Install]
WantedBy=multi-user.target

I've read that simply using the kill command will not terminate the server gracefully and one should use the minecraft-internal "stop" command instead. Unfortunately I could not figure out how to modify the ExecStop command to send internal commands to the minecraft process.

I'm building up my linux knowledge (at least I'm trying) by setting up services for different game servers.

Currently I'm working on a Minecraft Server that shall be started automatically on a server restart. Everything seems to work but I assume the way I'm terminating the server on stop command is not the best one.

That's the current unit file:

[Unit]
Description=Minecraft Dedicated Server
After=network.service

[Service]
User=user
Group=user_group
Type=simple
WorkingDirectory=/usr/local/bin/services/minecraft/
ExecStart=/usr/local/bin/services/minecraft/run.sh
ExecStop=/bin/kill -9 $MAINPID
RestartSec=15
Restart=on-failure

[Install]
WantedBy=multi-user.target

I've read that simply using the kill command will not terminate the server gracefully and one should use the minecraft-internal "stop" command instead. Unfortunately I could not figure out how to modify the ExecStop command to send internal commands to the minecraft process.

EDIT:

The following has been implemented:

minecraft.service:

[Unit]
Description=Minecraft Dedicated Server
After=network.service

[Service]
User=user
Group=user_group
Type=simple
KillSignal=SIGCONT
Sockets=minecraft.socket
WorkingDirectory=/usr/local/bin/services/minecraft/
ExecStart=/bin/sh -c "java -Xms2G -Xmx4G -XX:+UseConcMarkSweepGC -jar spigot-1.14.4.jar < /run/minecraft.control"
ExecStop=/bin/sh -c "echo /stop > /run/minecraft.control"
RestartSec=15
Restart=on-failure

[Install]
WantedBy=multi-user.target

minecraft.socket:

[Unit]
BindsTo=minecraft.service

[Socket]
ListenFIFO=/run/minecraft.control
RemoveOnStop=true
sockeSocketMode=0664
SocketUser=user
SocketGroup=user_group

Unfortunately, the commands passed through the minecraft.control fifo do not work.

I observed the following behavior: When sending a command using

echo "/help" > /run/minecraft.control

sometimes gives me an output when viewing the minecraft.control fifo (with cat) and sometimes not. If there's no output in the fifo, the journal of the minecraft.service unit displays Unknown command. Type "/help" for help. although I've sent "/help" as command. Additionally, the unit's ExecStop command

echo "/stop" > /run/minecraft.control

does not work either and the server gets killed by the sigkill signal instead.

Any idea why this does not work?

Source Link
Th1sD0t
Th1sD0t
  • 123
  • 1
  • 6

Using systemd's Exec*-command to pass commands to the process

I'm building up my linux knowledge (at least I'm trying) by setting up services for different game servers.

Currently I'm working on a Minecraft Server that shall be started automatically on a server restart. Everything seems to work but I assume the way I'm terminating the server on stop command is not the best one.

That's the current unit file:

[Unit]
Description=Minecraft Dedicated Server
After=network.service

[Service]
User=user
Group=user_group
Type=simple
WorkingDirectory=/usr/local/bin/services/minecraft/
ExecStart=/usr/local/bin/services/minecraft/run.sh
ExecStop=/bin/kill -9 $MAINPID
RestartSec=15
Restart=on-failure

[Install]
WantedBy=multi-user.target

I've read that simply using the kill command will not terminate the server gracefully and one should use the minecraft-internal "stop" command instead. Unfortunately I could not figure out how to modify the ExecStop command to send internal commands to the minecraft process.