[OpenRC] Minecraft server

conf.d-minecraft

# /etc/conf.d/minecraft
#
# Minecraft - OpenRC scripts
# Copyright (C) 2017-2019 João Brázio [[email protected]]
#

# For 1GB machines
#MINHEAP=128M
#MAXHEAP=1024M

# https://aikar.co/2018/07/02/tuning-the-jvm-g1gc-garbage-collector-flags-for-minecraft/
#CUSTOMARGS="-XX:+UseG1GC -XX:+ParallelRefProcEnabled -XX:MaxGCPauseMillis=200 -XX:+UnlockExperimentalVMOptions -XX:+DisableExplicitGC -XX:+AlwaysPreTouch -XX:G1NewSizePercent=30 -XX:G1MaxNewSizePercent=40 -XX:G1HeapRegionSize=8M -XX:G1ReservePercent=20 -XX:G1HeapWastePercent=5 -XX:G1MixedGCCountTarget=4 -XX:InitiatingHeapOccupancyPercent=15 -XX:G1MixedGCLiveThresholdPercent=90 -XX:G1RSetUpdatingPauseTimePercent=5 -XX:SurvivorRatio=32 -XX:+PerfDisableSharedMem -XX:MaxTenuringThreshold=1"

init.d-minecraft

#!/sbin/openrc-run
# /etc/init.d/minecraft
#
# Minecraft - OpenRC scripts
# Copyright (C) 2017-2019 João Brázio [[email protected]]
#
# Expects the game folder to be located at /srv/minecraft/<instance>
# Don't use directly the /etc/init.d/minecraft script, create a symlink for you instance.
#
# This is an example for Paper:
# - mkdir -p /srv/minecraft/paper
# - Download paper jar and place it there
# - ln -s /etc/init.d/minecraft /etc/init.d/minecraft.paper
# - cp /etc/conf.d/minecraft /etc/conf.d/minecraft.paper
#
# Dependencies:
# - Java VM at /usr/bin/java
# - mcrcon [https://github.com/Tiiffi/mcrcon]
#

USER=nobody
GROUP=nogroup

INSTANCE=${RC_SVCNAME##*.}
BASE="/srv/minecraft/${INSTANCE}"
PIDFILE="/var/run/${RC_SVCNAME}.pid"
RCON="/srv/minecraft/tools/mcrcon/mcrcon"
BIN="$(ls ${BASE} -v 2>/dev/null | grep -i "craftbukkit.*jar\\|spigot.*jar\\|paper*.*jar\\|minecraft_server.*jar" | head -n 1)"

config_get () {
        echo $(grep ${1} "${BASE}/server.properties" | cut -d '=' -f 2)
}

depend () {
        need net
        after ipsec
}

start_pre () {
        if [ -z "${BIN}" ]; then
                eerror "${RC_SVCNAME} cannot find a proper server jar."
                eerror "Check your game installation at ${BASE}."
                return 1
        fi

        [ -f "${PIDFILE}" ] && rm ${PIDFILE}

        return 0
}

start () {
        ebegin "Starting Minecraft server ${INSTANCE}"
        start-stop-daemon --start --chdir ${BASE} --pidfile ${PIDFILE} --make-pidfile \
                --exec /usr/bin/java --user ${USER} --group ${GROUP} --background -- -server -Xms${MINHEAP:-128M} -Xmx${MAXHEAP:-1024M} ${CUSTOMARGS} -jar ${BIN} nogui
        eend $?
}

stop_pre () {
        if [ ! -f "${BASE}/server.properties" ]; then
                eerror "${RC_SVCNAME} cannot find a proper server config file."
                eerror "Check your game installation at ${BASE}."
                return 1
        fi

        return 0
}

stop () {
        ebegin "Stopping Minecraft server ${INSTANCE}"

        if [ "$(config_get enable-rcon)" = "true" ]; then
                # Fetch rcon configuration
                RCON_SRV=$(config_get server.ip)
                RCON_PORT=$(config_get rcon.port)
                RCON_PASS=$(config_get rcon.password)

                # Try to soft kill the server
                ${RCON} -H ${RCON_SRV:-localhost} -P ${RCON_PORT} -p ${RCON_PASS} save-all 1>/dev/null 2>&1
                ${RCON} -H ${RCON_SRV:-localhost} -P ${RCON_PORT} -p ${RCON_PASS} stop 1>/dev/null 2>&1

                i=0
                PID=$(cat ${PIDFILE})

                while [ "${i}" -le 30 ]; do
                        kill -0 ${PID} 2>/dev/null && sleep 1 || break
                        i=$(( i + 1 ))
                done
        fi

        # Hard stop the server
        start-stop-daemon --stop --chdir ${BASE} --pidfile ${PIDFILE} --user ${USER} --group ${GROUP} --retry 5 2>/dev/null
        eend 0
}

status () {
        if [ "$(config_get enable-rcon)" = "true" ]; then
                # Fetch rcon configuration
                RCON_SRV=$(config_get server.ip)
                RCON_PORT=$(config_get rcon.port)
                RCON_PASS=$(config_get rcon.password)

                ${RCON} -H ${RCON_SRV:-localhost} -P ${RCON_PORT} -p ${RCON_PASS} version
                ${RCON} -H ${RCON_SRV:-localhost} -P ${RCON_PORT} -p ${RCON_PASS} tps
        fi
}

mcbackup

#!/bin/sh
# /usr/bin/mcbackup
#
# Minecraft - Backup tool
# Copyright (C) 2017-2019 João Brázio [[email protected]]
#
# Dependencies:
# - mcrcon [https://github.com/Tiiffi/mcrcon]
#

RCON="/srv/minecraft/tools/mcrcon/mcrcon"
BASE=/srv/minecraft
FLAVOUR=${1}

config_get () {
        echo $(grep ${1} "${BASE}/${FLAVOUR}/server.properties" | cut -d '=' -f 2)
}

# No argument provided
[ -z "${FLAVOUR}" ] && exit 2

# Non existing flavour
[ -d "${BASE}/${FLAVOUR}" ] || exit 3

# Non exiting config file
[ -f "${BASE}/${FLAVOUR}/server.properties" ] || exit 4

# Create backup folder if not found
[ -d "${BASE}/${FLAVOUR}/backup" ] || mkdir "${BASE}/${FLAVOUR}/backup"

# Remote console not enabled
[ "$(config_get enable-rcon)" = "true" ] || exit 5

RCON_SRV=$(config_get server.ip)
RCON_PORT=$(config_get rcon.port)
RCON_PASS=$(config_get rcon.password)

# Pause world saving
${RCON} -H ${RCON_SRV} -P ${RCON_PORT} -p ${RCON_PASS} save-all
${RCON} -H ${RCON_SRV} -P ${RCON_PORT} -p ${RCON_PASS} save-off

# Create tarball
tar --exclude="backup/*" \
  -cvjf "${BASE}/${FLAVOUR}/backup/mc-${FLAVOUR}-$(date +'%Y%m%d-%H%M%S').tbz2" -C "${BASE}" "${FLAVOUR}"

# Resume world saving
${RCON} -H ${RCON_SRV} -P ${RCON_PORT} -p ${RCON_PASS} save-on

exit 0