Since a few days I'm successfully running the new Minecraft Bedrock Edition dedicated server on my Ubuntu 18.04 LTS home server. Because it should be available 24/7 and automatically startup after boot I created a systemd service for a detached tmux session:
tmux.minecraftserver.service
[Unit]
Description=tmux minecraft_server detached
[Service]
Type=forking
WorkingDirectory=/home/mine/minecraftserver
ExecStart=/usr/bin/tmux new -s minecraftserver -d "LD_LIBRARY_PATH=. /home/mine/minecraftser$
User=mine
[Install]
WantedBy=multi-user.target
Everything works as expected but there's one tiny thing that keeps bugging me:
How can I prevent tmux from terminating it's whole session when I press Ctrl+C ?
I just want to terminate the Minecraft server process itself instead of the whole tmux session. When starting the server from the command line in a manually created tmux session this does work (session stays alive) but not when the session was brought up by systemd.
I as able to solve this by using systemd's ExecStartPost and tmux's send-keys like this:
[Unit]
Description=tmux minecraft_server detached
[Service]
Type=forking
WorkingDirectory=/home/mine/minecraftserver
ExecStart=/usr/bin/tmux new -d -s minecraftserver
ExecStartPost=/usr/bin/tmux send-keys -t minecraftserver "cd /home/mine/minecraftserver/" Enter "LD_LIBRARY_PATH=. ./bedrock_server" Enter
User=mine
[Install]
WantedBy=multi-user.target