docker-minecraft-server/docs/variables/index.md

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OS OPTIONS

NAME DESCRIPTION DEFAULT REQUIRED
UID The linux user id to run as 1000
GID The linux group id to run as 1000
MEMORY The image declares an initial and maximum Java memory-heap limit of 1 GB. 1G
INIT_MEMORY Independently sets the initial heap size 1G
MAX_MEMORY independently sets the max heap size 1G
TZ You can configure the timezone to match yours by setting the TZ environment variable.

alternatively, you can mount: /etc/localtime:/etc/localtime:ro

/etc/timezone:/etc/timezone:ro

UTC
ENABLE_ROLLING_LOGS By default the vanilla log file will grow without limit. The logger can be reconfigured to use a rolling log files strategy by setting this to true false
ENABLE_JMX To enable remote JMX, such as for profiling with VisualVM or JMC, add the environment variable ENABLE_JMX=true false
JMX_HOST If JMX is enabled, set JMX_HOST to the IP/host running the Docker container, and add a port forwarding of TCP port 7091
USE_AIKAR_FLAGS Aikar has done some research into finding the optimal JVM flags for GC tuning, which becomes more important as more users are connected concurrently false
JVM_OPTS General JVM options can be passed to the Minecraft Server invocation by passing a JVM_OPTS environment variable. The JVM requires -XX options to precede -X options, so those can be declared in JVM_XX_OPTS. Both variables are space-delimited, raw JVM arguments
JVM_XX_OPTS General JVM options can be passed to the Minecraft Server invocation by passing a JVM_OPTS environment variable. The JVM requires -XX options to precede -X options, so those can be declared in JVM_XX_OPTS. Both variables are space-delimited, raw JVM arguments
JVM_DD_OPTS As a shorthand for passing several system properties as -D arguments, you can instead pass a comma separated list of name=value or name:value pairs with JVM_DD_OPTS. (The colon syntax is provided for management platforms like Plesk that don't allow = inside a value.)
EXTRA_ARGS Arguments that would usually be passed to the jar file (those which are written after the filename)
LOG_TIMESTAMP To include the timestamp with each log set to true false

SERVER

NAME DESCRIPTION DEFAULT REQUIRED
TYPE The server type VANILLA
EULA You MUST set this to true  
VERSION The minecraft version LATEST
MOTD Set the server log in message.
DIFFICULTY The difficulty level. Available values: peaceful,easy,normal,hard easy
ICON The url or file path for the icon image to use for the server. It will be downloaded, scaled, and converted to the proper format.
OVERRIDE_ICON The server icon which has been set doesn't get overridden by default. Set this to TRUE to override the icon FALSE
MAX_PLAYERS The maximum number of players that can join the server. 20
MAX_WORLD_SIZE The maximum possible size in blocks, expressed as a radius.
ALLOW_NETHER Allows players to travel to the Nether true
ANNOUNCE_PLAYER_ACHIEVEMENTS Allows server to announce when a player gets an achievement. true
ENABLE_COMMAND_BLOCK Enables the command blocks.
FORCE_GAMEMODE Force players to join in the default game mode. false
GENERATE_STRUCTURES Defines whether structures (such as villages) will be generated. true
HARDCORE If set to true, players will be set to spectator mode if they die. false
SNOOPER_ENABLED If set to false, the server will not send data to snoop.minecraft.net server. true
MAX_BUILD_HEIGHT The maximum height in which building is allowed. Terrain may still naturally generate above a low height limit. 256
SPAWN_ANIMALS Determines if animals will be able to spawn. true
SPAWN_MONSTERS Determines if monsters will be spawned. true
SPAWN_NPCS Determines if villagers will be spawned. true
SPAWN_PROTECTION Sets the area that non-ops can not edit (0 to disable)
VIEW_DISTANCE Sets the amount of world data the server sends the client, measured in chunks in each direction of the player (radius, not diameter). It determines the server-side viewing distance.
SEED Sets the seed to create the Minecraft world. If you use a negative number, make sure that it is in quotes.
MODE Minecraft servers are configured to run in Survival mode by default. You can change the mode using MODE where you can either provide the standard numerical values or the shortcut values:
  • creative
  • survival
  • adventure
  • spectator(minecraft 1.8 or later)
PVP By default, servers are created with player-vs-player (PVP) mode enabled. true
LEVEL_TYPE By default, a standard world is generated with hills, valleys, water, etc. A different level type can be configured by setting LEVEL_TYPE to an expected type listed here. minecraft:default
GENERATOR_SETTINGS For some of the level types, GENERATOR_SETTINGS can be used to further customize the world generation as described here.
LEVEL You can either switch between world saves or run multiple containers with different saves by using the LEVEL option world
ONLINE_MODE By default, server checks connecting players against Minecraft's account database. If you want to create an offline server or your server is not connected to the internet, you can disable the server to try connecting to minecraft.net to authenticate players true
ALLOW_FLIGHT Allows users to use flight on your server while in Survival mode, if they have a mod that provides flight installed. FALSE
SERVER_NAME The server name
SERVER_PORT Only change this value if you know what you're doing. It is only needed when using host networking and it is rare that host networking should be used.
PLAYER_IDLE_TIMEOUT player-idle-timeout
ENABLE_JMX enable-jmx-monitoring
SYNC_CHUNK_WRITES sync-chunk-writes
ENABLE_STATUS enable-status
ENTITY_BROADCAST_RANGE_PERCENTAGE entity-broadcast-range-percentage
FUNCTION_PERMISSION_LEVEL function-permission-level
NETWORK_COMPRESSION_THRESHOLD network-compression-threshold
OP_PERMISSION_LEVEL op-permission-level
PREVENT_PROXY_CONNECTIONS prevent-proxy-connections
USE_NATIVE_TRANSPORT use-native-transport
SIMULATION_DISTANCE simulation-distance
EXEC_DIRECTLY If you would like to docker attach to the Minecraft server console with color and interactive capabilities, then set to true false
STOP_SERVER_ANNOUNCE_DELAY To allow time for players to finish what they're doing during a graceful server shutdown, set STOP_SERVER_ANNOUNCE_DELAY to a number of seconds to delay after an announcement is posted by the server.
PROXY You may configure the use of an HTTP/HTTPS proxy by passing the proxy's URL false
CONSOLE Some older versions (pre-1.14) of Spigot required --noconsole to be passed when detaching stdin TRUE
GUI Some older servers get confused and think that the GUI interface is enabled. TRUE
STOP_DURATION When the container is signalled to stop, the Minecraft process wrapper will attempt to send a "stop" command via RCON or console and waits for the process to gracefully finish. 60
SETUP_ONLY If you are using a host-attached data directory, then you can have the image setup the Minecraft server files and stop prior to launching the server process by setting this to true false
USE_FLARE_FLAGS To enable the JVM flags required to fully support the Flare profiling suite.
USE_SIMD_FLAGS Support for optimized SIMD operation false

CUSTOM RESOURCE PACK

NAME DESCRIPTION DEFAULT REQUIRED
RESOURCE_PACK A link to a custom resource pack
RESOURCE_PACK_SHA1 The checksum for the custom resource pack
RESOURCE_PACK_ENFORCE Enforce the resource pack on clients FALSE

WHITELIST

NAME DESCRIPTION DEFAULT REQUIRED
ENABLE_WHITELIST Enable the whitelist to manually manage the whitelist false
WHITELIST A list of usernames and/or UUIDs separated by comma
WHITELIST_FILE A url or file path to a whitelist json formatted file.
OVERRIDE_WHITELIST Enforce regeneration of the whitelist on each server startup. false

RCON

NAME DESCRIPTION DEFAULT REQUIRED
ENABLE_RCON Should RCON be enabled true
RCON_PASSWORD You MUST change this value Randomly generated
RCON_PORT The port for RCON 25575
BROADCAST_RCON_TO_OPS Should RCON be enabled false
RCON_CMDS_STARTUP RCON commands can be configured to execute when the server starts, a client connects, or a client disconnects
RCON_CMDS_ON_CONNECT RCON commands can be configured to execute when the server starts, a client connects, or a client disconnects
RCON_CMDS_ON_DISCONNECT RCON commands can be configured to execute when the server starts, a client connects, or a client disconnects
RCON_CMDS_LAST_DISCONNECT RCON commands can be configured to execute when the server starts, a client connects, or a client disconnects
RCON_CMDS_STARTUP RCON commands can be configured to execute when the server starts, a client connects, or a client disconnects

AUTOPAUSE

!!! note

Autopause is not compatible with `EXEC_DIRECTLY=true` and the two cannot be set together.
NAME DESCRIPTION DEFAULT REQUIRED
ENABLE_AUTOPAUSE Enable the Autopause functionality FALSE
AUTOPAUSE_TIMEOUT_EST describes the time between the last client disconnect and the pausing of the process 3600
AUTOPAUSE_TIMEOUT_INIT describes the time between server start and the pausing of the process, when no client connects in-between 600
AUTOPAUSE_TIMEOUT_KN describes the time between knocking of the port (e.g. by the main menu ping) and the pausing of the process, when no client connects in-between 120
AUTOPAUSE_PERIOD describes period of the daemonized state machine, that handles the pausing of the process 10
AUTOPAUSE_KNOCK_INTERFACE Describes the interface passed to the knockd daemon. If the default interface does not work, run the ifconfig command inside the container and derive the interface receiving the incoming connection from its output. The passed interface must exist inside the container. Using the loopback interface (lo) does likely not yield the desired results. eth0
DEBUG_AUTOPAUSE Adds additional debugging output for AutoPause false

AUTOSTOP

!!! note

AutoStop function is incompatible with the Autopause functionality, as they basically cancel out each other.
NAME DESCRIPTION DEFAULT REQUIRED
ENABLE_AUTOSTOP Enable the AutoStop functionality FALSE
AUTOSTOP_TIMEOUT_EST describes the time between the last client disconnect and the stopping of the server 3600
AUTOSTOP_TIMEOUT_INIT describes the time between server start and the stopping of the server, when no client connects in-between 1800
AUTOSTOP_PERIOD describes period of the daemonized state machine, that handles the stopping of the serve 10
DEBUG_AUTOSTOP Adds additional logging for AutoStop false

CURSEFORGE

!!! note

 A CurseForge API key is required to use a CurseForge type server. Go to their [developer console](https://console.curseforge.com/), generate an API key, and set the environment variable CF_API_KEY
NAME DESCRIPTION DEFAULT REQUIRED
CF_API_KEY YOUR CurseForge (Eternal) API Key.
CF_PAGE_URL Pass a page URL to the modpack or a specific file
CF_SLUG Instead of a URL, the modpack slug can be provided.
CF_FILE_ID The mod curseforge numerical ID.
CF_FILENAME_MATCHER Specify a substring to match the desired filename
CF_EXCLUDE_INCLUDE_FILE Global and per modpack exclusions can be declared in a JSON file and referenced with this variable.

By default, the file bundled with the image will be used, but can be disabled by setting this to an empty string. The schema of this file is documented here.
CF_EXCLUDE_MODS Mods can be excluded by passing a comma or space delimited list of project slugs or IDs
CF_FORCE_INCLUDE_MODS Mods can be included by passing a comma or space delimited list of project slugs or IDs
CF_FORCE_SYNCHRONIZE Forces the excludes/includes to be re-evaluated
CF_SET_LEVEL_FROM Some modpacks come with world/save data via a worlds file and/or the overrides provided with the modpack. Either approach can be selected to set the LEVEL to the resulting saves directory by setting this to either:
  • WORLD_FILE
  • OVERRIDES
CF_PARALLEL_DOWNLOADS specify how many parallel mod downloads to perform 4
CF_OVERRIDES_SKIP_EXISTING if set, files in the overrides that already exist in the data directory are skipped. world data is always skipped, if present. false