Minecraft 的 Systemd 服务脚本

顺手搭建一个 Minecraft 服务,以前都是直接用脚本控制,现在我们完全可以用 systemd 来管理服务端。


Minecraft 安装前提要素

首先安装必备的 JAVA JDK

yum install java-1.8.0-openjdk-headless

然后创建一个用户专门用于 minecraft 服务 注意 Minecraft 多服务器汇总文件夹路径为 /minecraft

useradd -r -m -U -d /minecraft -s /bin/bash minecraft

Minecraft 的通用 Systemd 服务文件

创建通用服务文件 /etc/systemd/system/[email protected] 并输入以下内容。

注意 WorkingDirectory=/work/local/minecraft/%i 为你的 Minecraft 服务端文件夹路径,%i 对应进程名的变量。

[Unit]
Description=Minecraft Server %i
After=network.target

[Service]
WorkingDirectory=/work/local/minecraft/%i
PrivateUsers=true # Users Database is not available for within the unit, only root and minecraft is available, everybody else is nobody
User=minecraft
Group=minecraft
ProtectSystem=full # Read only mapping of /usr /boot and /etc
ProtectHome=true # /home, /root and /run/user seem to be empty from within the unit. It is recommended to enable this setting for all long-running services (in particular network-facing ones).
ProtectKernelTunables=true # /proc/sys, /sys, /proc/sysrq-trigger, /proc/latency_stats, /proc/acpi, /proc/timer_stats, /proc/fs and /proc/irq will be read-only within the unit. It is recommended to turn this on for most services.
# Implies MountFlags=slave
ProtectKernelModules=true # Block module system calls, also /usr/lib/modules. It is recommended to turn this on for most services that do not need special file systems or extra kernel modules to work
# Implies NoNewPrivileges=yes
ProtectControlGroups=true # It is hence recommended to turn this on for most services.
# Implies MountAPIVFS=yes

ExecStart=/bin/sh -c '/usr/bin/screen -DmS mc-%i /usr/bin/java -server -Xms512M -Xmx2048M -XX:+UseG1GC -XX:+CMSClassUnloadingEnabled -XX:ParallelGCThreads=2 -XX:MinHeapFreeRatio=5 -XX:MaxHeapFreeRatio=10 -jar $(ls -v | grep -i "minecraft_server.*jar" | head -n 1) nogui'

ExecReload=/usr/bin/screen -p 0 -S mc-%i -X eval 'stuff "reload"\\015'

ExecStop=/usr/bin/screen -p 0 -S mc-%i -X eval 'stuff "say SERVER SHUTTING DOWN. Saving map..."\\015'
ExecStop=/usr/bin/screen -p 0 -S mc-%i -X eval 'stuff "save-all"\\015'
ExecStop=/usr/bin/screen -p 0 -S mc-%i -X eval 'stuff "stop"\\015'
ExecStop=/bin/sleep 10

Restart=on-failure
RestartSec=60s

[Install]
WantedBy=multi-user.target

#########
# HowTo
#########
#
# Create a directory in /work/service/minecraft/XX where XX is a name like 'survival'
# Add minecraft_server.jar into dir with other conf files for minecraft server
#
# Enable/Start systemd service
#    systemctl enable [email protected]
#    systemctl start [email protected]
#
# To run multiple servers simply create a new dir structure and enable/start it
#    systemctl enable [email protected]
# systemctl start [email protected]

创建好后,你可以通过这个通用服务文件启动 Minecraft 服务。

例如你的服务端文件夹为 /minecraft/server 此时你的启动命令为

systemctl start [email protected]

记得如果想设置开机启动同样要配置上

systemctl enable [email protected]

非服务方式,单独启动服务端文件的命令

/usr/bin/java -server -Xms512M -Xmx2048M -XX:+UseG1GC -XX:+CMSClassUnloadingEnabled -XX:ParallelGCThreads=2 -XX:MinHeapFreeRatio=5 -XX:MaxHeapFreeRatio=10 -jar minecraft_server.1.14.3.jar nogui
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