- #!/usr/bin/env bash
- # NOTE: We use bash for better readability and error handling here
- # but it's not hard to make it work with regular shell
- set -euo pipefail
- # SETTINGS
- # Path to file used to communicate from restart script
- readonly restart_flag='.restart_flag'
- # How long (in seconds) to wait before restarting
- readonly restart_delay=10
- # Whether to restart on crash or not
- # The `settings.restart-on-crash` setting in spigot.yml doesn't always work
- # but also sometimes server might not return proper exit code,
- # so it's best to keep both options enabled
- # Accepted values: y/yes/true/n/no/false
- readonly restart_on_crash='yes'
- # The name of your server jar
- readonly server_jar='paperclip.jar'
- # What will be passed to `-Xms` and `-Xmx`
- readonly heap_size='1G'
- # JVM startup flags, one per line for better readability
- # NOTE: -Xms and -Xmx are set separately
- # These are mostly "Aikar flags"
- # taken from: https://mcflags.emc.gs/
- readonly jvm_flags=(
- -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
- -Dusing.aikars.flags=https://mcflags.emc.gs
- -Daikars.new.flags=true
- )
- # Minecraft args you might want to start your server with
- # Usually there isn't much to configure here:
- readonly mc_args=(
- --nogui # Start the server without GUI
- )
- # END OF SETTINGS
- should_restart_on_crash() {
- case "${restart_on_crash,,}" in
- y|yes|true) return 0;;
- n|no|false) return 1;;
- *)
- printf 'ERROR: Invalid value for "restart_on_crash" variable: %s\n' "${restart_on_crash}" >&2
- exit 1
- ;;
- esac
- }
- # The arguments that will be passed to java:
- readonly java_args=(
- -Xms"${heap_size}" # Set heap min size
- -Xmx"${heap_size}" # Set heap max size
- "${jvm_flags[@]}" # Use jvm flags specified above
- -jar "${server_jar}" # Run the server
- "${mc_args[@]}" # And pass it these settings
- )
- # Remove restart flag, if it exists,
- # so that we won't restart the server after first stop,
- # unless restart script was called
- rm "${restart_flag}" &>/dev/null || true
- # Check if `restart_on_crash` has valid value
- should_restart_on_crash || true
- while :; do # Loop infinitely
- # Run server
- java "${java_args[@]}" || {
- # Oops, server didn't exit gracefully
- printf 'Detected server crash (exit code: %s)\n' "${?}" >&2
- # Check if we should restart on crash or not
- if should_restart_on_crash; then
- touch "${restart_flag}"
- fi
- }
- # Check if restart file exists or exit
- if [ -e "${restart_flag}" ]; then
- # The flag exists - try to remove it
- rm "${restart_flag}" || {
- # If we can't remove it (permissions?), then exit to avoid endless restart loop
- printf 'Error removing restart flag (exit code: %s) - cowardly exiting\n' "${?}" >&2
- exit 1
- }
- else
- break # Flag doesn't exist, so break out of the loop
- fi
- printf 'Restarting server in 10 seconds, press Ctrl+C to abort.\n' >&2
- sleep "${restart_delay}" || break # Exit if sleep is interrupted (for example Ctrl+C)
- done
- printf 'Server stopped\n' >&2
|