Core Keeper

Game

Core Keeper is a survival sandbox game for single or multiplayers. --- Drawn towards a mysterious relic, you are an explorer who awakens in an ancient cavern of creatures, resources and trinkets. Trapped deep underground will your survival skills be up to the task? Mine relics and resources to build your base, craft new equipment, survive, and power up the Core. ---

Author: karsten@fiedleronline.netSource: pterodactyl/game-eggsUpdated: 5/24/2026

Startup Command

export DISPLAY=:0; rm ./GameID.txt ./CoreKeeperServerLog.txt; touch ./CoreKeeperServerLog.txt; xvfb-run -s "-screen 0 {{DISPLAY_WIDTH}}x{{DISPLAY_HEIGHT}}x{{DISPLAY_DEPTH}} -ac -nolisten tcp -nolisten unix" ./CoreKeeperServer -batchmode -logfile CoreKeeperServerLog.txt -world {{WORLD_INDEX}} -worldname "{{WORLD_NAME}}" -worldseed {{WORLD_SEED}} $([[ "{{GAME_ID}}" != "" ]] && echo -n " -gameid {{GAME_ID}}") -maxplayers {{MAX_PLAYERS}} -worldmode {{WORLD_MODE}} -port {{SERVER_PORT}} & CKPID=$!; tail -f CoreKeeperServerLog.txt | grep -e '^\[userid:[0-9]*\] player' -e '^[^\[]' & LOGPID=$!; trap "kill ${CKPID}; wait ${CKPID}; kill ${LOGPID}; wait ${LOGPID}" 15; wait $!

Docker Images

Label	Image
ghcr.io/ptero-eggs/steamcmd:debian	ghcr.io/ptero-eggs/steamcmd:debian

Environment Variables

Name	Variable	Default	Rules
World Index Which world index to use. Default: 0.	WORLD_INDEX	0	required\|integer\|min:0
World Name The name to use for the server. Defaul: Core Keeper Server.	WORLD_NAME	Core Keeper Server	required\|string\|max:100\|min:3
World Seed The seed to use for a new world. Set to 0 to generate random seed. Default: 0.	WORLD_SEED	0	required\|integer\|min:0
Game ID Game ID to use for the server. Needs to be at least 28 characters and alphanumeric, excluding Y,y,x,0,O. Empty or not valid means a new ID will be generated at start. Default: EMPTY.	GAME_ID	none	nullable\|string\|min:28
Max Players Maximum number of players that will be allowed to connect to server. Maximum is 100. Default: 100,	MAX_PLAYERS	100	required\|integer\|min:1\|max:100
World Mode Whether to use normal (0) or hard (1) mode for world.	WORLD_MODE	0	required\|boolean
Steam App ID Steam App ID of Core Keeper Dedicated Server	SRCDS_APPID	1963720	required\|string\|in:1963720
Auto Update Enable automatic updates on boot	AUTO_UPDATE	1	required\|boolean
DISPLAY_WIDTH Virtual display width. Fix:1.	DISPLAY_WIDTH	1	required\|integer
DISPLAY_HEIGHT Virtual display height. Fix:1.	DISPLAY_HEIGHT	1	required\|integer
DISPLAY_DEPTH Virtual display color depth. Fix: 24.	DISPLAY_DEPTH	24	required\|integer

Features

steam_disk_space