-p 25565:25565 -e EULA=TRUE --name mc itzg/minecraft-server
### Fixing "unable to launch forgemodloader"
If your server's modpack fails to load with an error [like this](https://support.feed-the-beast.com/t/cant-start-crashlanding-server-unable-to-launch-forgemodloader/6028/2):
unable to launch forgemodloader
then you apply a workaround by adding this to the run invocation:
-e FTB_LEGACYJAVAFIXER=true
### Using a client-made curseforge modpack
If you use something like curseforge, you may end up creating/using modpacks that do not
contain server mod jars. Instead, the curseforge setup has `manifest.json` files, which
will show up under `/data/FeedTheBeast/manifest.json`.
To use these packs you will need to:
- Specify the manifest location with env var `MANIFEST=/data/FeedTheBeast/manifest`
- Pick a relevant ServerStart.sh and potentially settings.cfg and put them in `/data/FeedTheBeast`
An example of the latter would be to use https://github.com/AllTheMods/Server-Scripts
There, you'll find that all you have to do is put `ServerStart.sh` and `settings.cfg` into
`/data/FeedTheBeast`, taking care to update `settings.cfg` to specify your desired version
of minecraft and forge. You can do this in the cli with something like:
-p 25565:25565 -e EULA=TRUE --name mc itzg/minecraft-server
```
## Using Docker Compose
Rather than type the server options below, the port mappings above, etc
every time you want to create new Minecraft server, you can now use
[Docker Compose](https://docs.docker.com/compose/). Start with a
`docker-compose.yml` file like the following:
```
minecraft-server:
ports:
- "25565:25565"
environment:
EULA: "TRUE"
image: itzg/minecraft-server
container_name: mc
tty: true
stdin_open: true
restart: always
```
and in the same directory as that file run
docker-compose up -d
Now, go play...or adjust the `environment` section to configure
this server instance.
## Server configuration
By default the server configuration will be created and set based on the following
environment variables, but only the first time the server is started. If the
`server.properties` file already exists, the values in them will not be changed.
If you would like to override the server configuration each time the container
starts up, you can set the OVERRIDE_SERVER_PROPERTIES environment variable like:
docker run -d -e OVERRIDE_SERVER_PROPERTIES=true ...
This will reset any manual configuration of the `server.properties` file, so if
you want to make any persistent configuration changes you will need to make sure
you have properly set the proper environment variables in your docker run command (described below).
### Server name
The server name (e.g. for bungeecord) can be set like:
docker run -d -e SERVER_NAME=MyServer ...
### Server port
The server port can be set like:
docker run -d -e SERVER_PORT=25565 ...
### Difficulty
The difficulty level (default: `easy`) can be set like:
docker run -d -e DIFFICULTY=hard ...
Valid values are: `peaceful`, `easy`, `normal`, and `hard`, and an
error message will be output in the logs if it's not one of these
values.
### Whitelist Players
To whitelist players for your Minecraft server, pass the Minecraft usernames separated by commas via the `WHITELIST` environment variable, such as
docker run -d -e WHITELIST=user1,user2 ...
If the `WHITELIST` environment variable is not used, any user can join your Minecraft server if it's publicly accessible.
### Op/Administrator Players
To add more "op" (aka adminstrator) users to your Minecraft server, pass the Minecraft usernames separated by commas via the `OPS` environment variable, such as
docker run -d -e OPS=user1,user2 ...
### Server icon
A server icon can be configured using the `ICON` variable. The image will be automatically
downloaded, scaled, and converted from any other image format:
docker run -d -e ICON=http://..../some/image.png ...
### Rcon
To use rcon use the `ENABLE_RCON` and `RCON_PASSORD` variables.
By default rcon port will be `25575` but can easily be changed with the `RCON_PORT` variable.
docker run -d -e ENABLE_RCON=true -e RCON_PASSWORD=testing
### Query
Enabling this will enable the gamespy query protocol.
By default the query port will be `25565` (UDP) but can easily be changed with the `QUERY_PORT` variable.
docker run -d -e ENABLE_QUERY=true
### Max players
By default max players is 20, you can increase this with the `MAX_PLAYERS` variable.
docker run -d -e MAX_PLAYERS=50
### Max world size
This sets the maximum possible size in blocks, expressed as a radius, that the world border can obtain.
docker run -d -e MAX_WORLD_SIZE=10000
### Allow Nether
Allows players to travel to the Nether.
docker run -d -e ALLOW_NETHER=true
### Announce Player Achievements
Allows server to announce when a player gets an achievement.
docker run -d -e ANNOUNCE_PLAYER_ACHIEVEMENTS=true
### Enable Command Block
Enables command blocks
docker run -d -e ENABLE_COMMAND_BLOCK=true
### Force Gamemode
Force players to join in the default game mode.
* false - Players will join in the gamemode they left in.
* true - Players will always join in the default gamemode.
`docker run -d -e FORCE_GAMEMODE=false`
### Generate Structures
Defines whether structures (such as villages) will be generated.
* false - Structures will not be generated in new chunks.
* true - Structures will be generated in new chunks.
`docker run -d -e GENERATE_STRUCTURES=true`
### Hardcore
If set to true, players will be set to spectator mode if they die.
docker run -d -e HARDCORE=false
### Snooper
If set to false, the server will not send data to snoop.minecraft.net server.
docker run -d -e SNOOPER_ENABLED=false
### Max Build Height
The maximum height in which building is allowed.
Terrain may still naturally generate above a low height limit.
docker run -d -e MAX_BUILD_HEIGHT=256
### Max Tick Time
The maximum number of milliseconds a single tick may take before the server watchdog stops the server with the message, A single server tick took 60.00 seconds (should be max 0.05); Considering it to be crashed, server will forcibly shutdown. Once this criteria is met, it calls System.exit(1).
Setting this to -1 will disable watchdog entirely
docker run -d -e MAX_TICK_TIME=60000
### Spawn Animals
Determines if animals will be able to spawn.
docker run -d -e SPAWN_ANIMALS=true
### Spawn Monsters
Determines if monsters will be spawned.
docker run -d -e SPAWN_MONSTERS=true
### Spawn NPCs
Determines if villagers will be spawned.
docker run -d -e SPAWN_NPCS=true
### 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.
docker run -d -e VIEW_DISTANCE=10
### Level Seed
If you want to create the Minecraft level with a specific seed, use `SEED`, such as
docker run -d -e SEED=1785852800490497919 ...
### Game Mode
By default, Minecraft servers are configured to run in Survival mode. You can
change the mode using `MODE` where you can either provide the [standard
numerical values](http://minecraft.gamepedia.com/Game_mode#Game_modes) or the
shortcut values:
* creative
* survival
* adventure
* spectator (only for Minecraft 1.8 or later)
For example:
docker run -d -e MODE=creative ...
### Message of the Day
The message of the day, shown below each server entry in the UI, can be changed with the `MOTD` environment variable, such as
docker run -d -e 'MOTD=My Server' ...
If you leave it off, a default is computed from the server type and version, such as
A Paper Minecraft Server powered by Docker
when `TYPE` is `PAPER`. That way you can easily differentiate between several servers you may have started.
_The example shows how to specify a server message of the day that contains spaces by putting quotes
around the whole thing._
### PVP Mode
By default, servers are created with player-vs-player (PVP) mode enabled. You can disable this with the `PVP`
environment variable set to `false`, such as
docker run -d -e PVP=false ...
### Level Type and Generator Settings
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, such as
* DEFAULT
* FLAT
* LARGEBIOMES
* AMPLIFIED
* CUSTOMIZED
* BUFFET
Descriptions are available at the [gamepedia](http://minecraft.gamepedia.com/Server.properties).
When using a level type of `FLAT`, `CUSTOMIZED`, and `BUFFET`, you can further configure the world generator
by passing [custom generator settings](http://minecraft.gamepedia.com/Superflat).
**Since generator settings usually have ;'s in them, surround the -e value with a single quote, like below.**
You can either switch between world saves or run multiple containers with different saves by using the `LEVEL` option,
where the default is "world":
docker run -d -e LEVEL=bonus ...
**NOTE:** if running multiple containers be sure to either specify a different `-v` host directory for each
`LEVEL` in use or don't use `-v` and the container's filesystem will keep things encapsulated.
### Downloadable world
Instead of mounting the `/data` volume, you can instead specify the URL of
a ZIP file containing an archived world. This will be downloaded, and
unpacked in the `/data` directory; if it does not contain a subdirectory
called `world/` then it will be searched for a file `level.dat` and the
containing subdirectory renamed to `world`. This means that most of the
archived Minecraft worlds downloadable from the Internet will already be in
the correct format.
The ZIP file may also contain a `server.properties` file and `modules`
directory, if required.
docker run -d -e WORLD=http://www.example.com/worlds/MySave.zip ...
**NOTE:** Unless you also mount `/data` as an external volume, this world
will be deleted when the container is deleted.
**NOTE:** This URL must be accessible from inside the container. Therefore,
you should use an IP address or a globally resolveable FQDN, or else the
name of a linked container.
### Cloning world from a container path
The `WORLD` option can also be used to reference a directory that will be used
as a source to clone the world directory.
For example, the following would initially clone the world's content
from `/worlds/basic`. Also notice in the example that you can use a
read-only volume attachment to ensure the clone source remains pristine.
```
docker run ... -v $HOME/worlds:/worlds:ro -e WORLD=/worlds/basic
```
### Downloadable mod/plugin pack for Forge, Bukkit, and Spigot Servers
Like the `WORLD` option above, you can specify the URL of a "mod pack"
to download and install into `mods` for Forge or `plugins` for Bukkit/Spigot.
To use this option pass the environment variable `MODPACK`, such as
docker run -d -e MODPACK=http://www.example.com/mods/modpack.zip ...
**NOTE:** The referenced URL must be a zip file with one or more jar files at the
top level of the zip archive. Make sure the jars are compatible with the
particular `TYPE` of server you are running.
You may also download individual mods using the `MODS` environment variable and supplying the URL
to the jar files. Multiple mods/plugins should be comma separated.
docker run -d -e MODS=https://www.example.com/mods/mod1.jar,https://www.example.com/mods/mod2.jar ...
### Remove old mods/plugins
When the option above is specified (`MODPACK`) you can also instruct script to
delete old mods/plugins prior to installing new ones. This behaviour is desirable
in case you want to upgrade mods/plugins from downloaded zip file.
To use this option pass the environment variable `REMOVE_OLD_MODS="TRUE"`, such as
docker run -d -e REMOVE_OLD_MODS="TRUE" -e MODPACK=http://www.example.com/mods/modpack.zip ...
**WARNING:** All content of the `mods` or `plugins` directory will be deleted
before unpacking new content from the MODPACK or MODS.
### 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 with environment variable `ONLINE_MODE`, like this
docker run -d -e ONLINE_MODE=FALSE ...
### Allow flight
Allows users to use flight on your server while in Survival mode, if they have a mod that provides flight installed.
-e ALLOW_FLIGHT=TRUE|FALSE
## Miscellaneous Options
### Running as alternate user/group ID
By default, the container will switch to user ID 1000 and group ID 1000;
however, you can override those values by setting `UID` and/or `GID` as environmental entries, during the `docker run` command.
-e UID=1234
-e GID=1234
The container will also skip user switching if the `--user`/`-u` argument
is passed to `docker run`.
### Memory Limit
By default, the image declares a Java initial and maximum memory limit of 1 GB. There are several
ways to adjust the memory settings:
*`MEMORY`, "1G" by default, can be used to adjust both initial (`Xms`) and max (`Xmx`)
memory settings of the JVM
*`INIT_MEMORY`, independently sets the initial heap size
*`MAX_MEMORY`, independently sets the max heap size
The values of all three are passed directly to the JVM and support format/units as
`<size>[g|G|m|M|k|K]`.
### JVM Options
General JVM options can be passed to the Minecraft Server invocation by passing a `JVM_OPTS`
environment variable. Options like `-X` that need to proceed general JVM options can be passed
via a `JVM_XX_OPTS` environment variable.
For some cases, if e.g. after removing mods, it could be necessary to startup minecraft with an additional `-D` parameter like `-Dfml.queryResult=confirm`. To address this you can use the environment variable `JVM_DD_OPTS`, which builds the params from a given list of values separated by space, but without the `-D` prefix. To make things running under systems (e.g. Plesk), which doesn't allow `=` inside values, a `:` (colon) could be used instead. The upper example would look like this:
`JVM_DD_OPTS=fml.queryResult:confirm`, and will be converted to `-Dfml.queryResult=confirm`.
### HTTP Proxy
You may configure the use of an HTTP/HTTPS proxy by passing the proxy's URL via the `PROXY`
environment variable. In [the example compose file](docker-compose-proxied.yml) it references
a companion squid proxy by setting the equivalent of
