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docker-minecraft-server/README.md
Geoff Bourne 0d5eb2ea9e docs: fixed heading depth 
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This docker image provides a Minecraft Server that will automatically download the latest stable
version at startup. You can also run/upgrade to any specific version or the
latest snapshot. See the _Versions_ section below for more information.
To simply use the latest stable version, run
docker run -d -it -p 25565:25565 -e EULA=TRUE itzg/minecraft-server
where, in this case, the standard server port 25565, will be exposed on your host machine.
> If you plan on running a server for a longer amount of time it is highly recommended using a management layer such as [Docker Compose](#using-docker-compose) or [Kubernetes](#deployment-templates-and-examples) to allow for incremental reconfiguration and image upgrades.
> Be sure to always include `-e EULA=TRUE` in your commands and container definitions, as Mojang/Microsoft requires EULA acceptance.
By default, the container will download the latest version of the "vanilla" [Minecraft: Java Edition server](https://www.minecraft.net/en-us/download/server) provided by Mojang. The [`VERSION`](#versions) and the [`TYPE`](#server-types) can be configured to create many variations of desired Minecraft server.
**TABLE OF CONTENTS**
<!--ts-->
* [Looking for a Bedrock Dedicated Server](#looking-for-a-bedrock-dedicated-server)
* [Interacting with the server](#interacting-with-the-server)
* [Data Directory](#data-directory)
* [Attaching data directory to host filesystem](#attaching-data-directory-to-host-filesystem)
* [Converting anonymous /data volume to named volume](#converting-anonymous-data-volume-to-named-volume)
* [Versions](#versions)
* [Running Minecraft server on different Java version](#running-minecraft-server-on-different-java-version)
* [Deprecated Image Tags](#deprecated-image-tags)
* [Healthcheck](#healthcheck)
* [Deployment Templates and Examples](#deployment-templates-and-examples)
* [Helm Charts](#helm-charts)
* [Examples](#examples)
* [Amazon Web Services (AWS) Deployment](#amazon-web-services-aws-deployment)
* [Using Docker Compose](#using-docker-compose)
* [Server types](#server-types)
* [Running a Forge Server](#running-a-forge-server)
* [Running a Bukkit/Spigot server](#running-a-bukkitspigot-server)
* [Running a Paper server](#running-a-paper-server)
* [Running a Tuinity server](#running-a-tuinity-server)
* [Running an Airplane server](#running-an-airplane-server)
* [Running a Purpur server](#running-a-purpur-server)
* [Running a Yatopia server](#running-a-yatopia-server)
* [Running a Magma server](#running-a-magma-server)
* [Running a Mohist server](#running-a-mohist-server)
* [Running a Catserver type server](#running-a-catserver-type-server)
* [Running an Canyon server](#running-an-canyon-server)
* [Running a SpongeVanilla server](#running-a-spongevanilla-server)
* [Running a Fabric Server](#running-a-fabric-server)
* [Running a server with a Feed the Beast modpack](#running-a-server-with-a-feed-the-beast-modpack)
* [Environment Variables:](#environment-variables)
* [Upgrading](#upgrading)
* [Example](#example)
* [Running a server with a CurseForge modpack](#running-a-server-with-a-curseforge-modpack)
* [Modpack data directory](#modpack-data-directory)
* [Buggy start scripts](#buggy-start-scripts)
* [Fixing "unable to launch forgemodloader"](#fixing-unable-to-launch-forgemodloader)
* [Working with mods and plugins](#working-with-mods-and-plugins)
* [Optional plugins, mods, and config attach points](#optional-plugins-mods-and-config-attach-points)
* [Auto-downloading SpigotMC/Bukkit/PaperMC plugins](#auto-downloading-spigotmcbukkitpapermc-plugins)
* [Downloadable mod/plugin pack for Forge, Bukkit, and Spigot Servers](#downloadable-modplugin-pack-for-forge-bukkit-and-spigot-servers)
* [Remove old mods/plugins](#remove-old-modsplugins)
* [Working with world data](#working-with-world-data)
* [Downloadable world](#downloadable-world)
* [Cloning world from a container path](#cloning-world-from-a-container-path)
* [Overwrite world on start](#overwrite-world-on-start)
* [Server configuration](#server-configuration)
* [Server name](#server-name)
* [Server port](#server-port)
* [Difficulty](#difficulty)
* [Whitelist Players](#whitelist-players)
* [Op/Administrator Players](#opadministrator-players)
* [Server icon](#server-icon)
* [Rcon](#rcon)
* [Query](#query)
* [Max players](#max-players)
* [Max world size](#max-world-size)
* [Allow Nether](#allow-nether)
* [Announce Player Achievements](#announce-player-achievements)
* [Enable Command Block](#enable-command-block)
* [Force Gamemode](#force-gamemode)
* [Generate Structures](#generate-structures)
* [Hardcore](#hardcore)
* [Snooper](#snooper)
* [Max Build Height](#max-build-height)
* [Max Tick Time](#max-tick-time)
* [Spawn Animals](#spawn-animals)
* [Spawn Monsters](#spawn-monsters)
* [Spawn NPCs](#spawn-npcs)
* [Set spawn protection](#set-spawn-protection)
* [View Distance](#view-distance)
* [Level Seed](#level-seed)
* [Game Mode](#game-mode)
* [Message of the Day](#message-of-the-day)
* [PVP Mode](#pvp-mode)
* [Level Type and Generator Settings](#level-type-and-generator-settings)
* [Custom Server Resource Pack](#custom-server-resource-pack)
* [Level / World Save Name](#level--world-save-name)
* [Online mode](#online-mode)
* [Allow flight](#allow-flight)
* [Other server property mappings](#other-server-property-mappings)
* [Miscellaneous Options](#miscellaneous-options)
* [Replacing variables inside configs](#replacing-variables-inside-configs)
* [Running with a custom server JAR](#running-with-a-custom-server-jar)
* [Force re-download of the server file](#force-re-download-of-the-server-file)
* [Running as alternate user/group ID](#running-as-alternate-usergroup-id)
* [Memory Limit](#memory-limit)
* [JVM Options](#jvm-options)
* [Interactive and Color Console](#interactive-and-color-console)
* [OpenJ9 Specific Options](#openj9-specific-options)
* [Enabling rolling logs](#enabling-rolling-logs)
* [Timezone Configuration](#timezone-configuration)
* [Enable Remote JMX for Profiling](#enable-remote-jmx-for-profiling)
* [Enable Aikar's Flags](#enable-aikars-flags)
* [HTTP Proxy](#http-proxy)
* [Using "noconsole" option](#using-noconsole-option)
* [Explicitly disable GUI](#explicitly-disable-gui)
* [Stop Duration](#stop-duration)
* [Autopause](#autopause)
* [Description](#description)
* [Enabling Autopause](#enabling-autopause)
* [Running on RaspberryPi](#running-on-raspberrypi)
<!-- Added by: runner, at: Sun Jul 18 21:20:48 UTC 2021 -->
<!--te-->
## Looking for a Bedrock Dedicated Server
For Minecraft clients running on consoles, mobile, or native Windows, you'll need to
use this image instead:
[itzg/minecraft-bedrock-server](https://hub.docker.com/r/itzg/minecraft-bedrock-server)
## Interacting with the server
[RCON](http://wiki.vg/RCON) is enabled by default, so you can `exec` into the container to
access the Minecraft server console:
```
docker exec -i mc rcon-cli
```
Note: The `-i` is required for interactive use of rcon-cli.
To run a simple, one-shot command, such as stopping a Minecraft server, pass the command as
arguments to `rcon-cli`, such as:
```
docker exec mc rcon-cli stop
```
_The `-i` is not needed in this case._
In order to attach and interact with the Minecraft server, add `-it` when starting the container, such as
docker run -d -it -p 25565:25565 --name mc itzg/minecraft-server
With that you can attach and interact at any time using
docker attach mc
and then Control-p Control-q to **detach**.
For remote access, configure your Docker daemon to use a `tcp` socket (such as `-H tcp://0.0.0.0:2375`)
and attach from another machine:
docker -H $HOST:2375 attach mc
Unless you're on a home/private LAN, you should [enable TLS access](https://docs.docker.com/articles/https/).
## Data Directory
Everything the container manages is located under the **container's** `/data` path, as shown here:
![](docs/level-vs-world.drawio.png)
> NOTE: The container path `/data` is pre-declared as a volume, so if you do nothing then it will be allocated as an anonymous volume. As such, it is subject to removal when the container is removed.
### Attaching data directory to host filesystem
In most cases the easier way to persist and work with the minecraft data files is to use the `-v` argument to map a directory on your host machine to the container's `/data` directory, such as the following where `/home/user/minecraft-data` would be a directory of your choosing on your host machine:
docker run -d -v /home/user/minecraft-data:/data ...
When attached in this way you can stop the server, edit the configuration under your attached directory and start the server again to pick up the new configuration.
With Docker Compose, setting up a host attached directory is even easier since relative paths can be configured. For example, with the following `docker-compose.yml` Docker will automatically create/attach the relative directory `minecraft-data` to the container.
```yaml
version: "3"
services:
mc:
image: itzg/minecraft-server
ports:
- 25565:25565
environment:
EULA: "TRUE"
tty: true
stdin_open: true
restart: unless-stopped
volumes:
# attach a directory relative to the directory containing this compose file
- ./minecraft-data:/data
```
### Converting anonymous `/data` volume to named volume
If you had used the commands in the first section, without the `-v` volume attachment, then an anonymous data volume was created by Docker. You can later bring over that content to a named or host attached volume using the following procedure.
> In this example, it is assumed the original container was given a `--name` of "mc", so change the container identifier accordingly.
First, stop the existing container:
```shell
docker stop mc
```
Use a temporary container to copy over the anonymous volume's content into a named volume, "mc" in this case:
```shell
docker run --rm --volumes-from mc -v mc:/new alpine cp -avT /data /new
```
Now you can recreate the container with any environment variable changes, etc by attaching the named volume created from the previous step:
```shell
docker run -d -it --name mc-new -v mc:/data -p 25565:25565 -e EULA=TRUE -e MEMORY=2G itzg/minecraft-server
```
## Versions
To use a different Minecraft version, pass the `VERSION` environment variable (case sensitive), which can have the value
- LATEST (the default)
- SNAPSHOT
- or a specific version, such as "1.7.9"
For example, to use the latest snapshot:
docker run -d -e VERSION=SNAPSHOT ...
or a specific version:
docker run -d -e VERSION=1.7.9 ...
When using "LATEST" or "SNAPSHOT" an upgrade can be performed by simply restarting the container.
During the next startup, if a newer version is available from the respective release channel, then
the new server jar file is downloaded and used. _NOTE: over time you might see older versions of
the server jar remain in the `/data` directory. It is safe to remove those._
## Running Minecraft server on different Java version
To use a different version of Java, please use a docker tag to run your Minecraft server.
| Tag name | Java version | Linux | JVM Type | Architecture |
| -------------- | -------------|--------|----------|-------------------|
| latest | 16 | Debian | Hotspot | amd64,arm64,armv7 |
| java8 | 8 | Alpine | Hotspot | amd64 |
| java8-multiarch | 8 | Debian | Hotspot | amd64,arm64,armv7 |
| java8-openj9 | 8 | Debian | OpenJ9 | amd64 |
| java11 | 11 | Debian | Hotspot | amd64,arm64,armv7 |
| java11-openj9 | 11 | Debian | OpenJ9 | amd64 |
| java16 | 16 | Debian | Hotspot | amd64,arm64,armv7 |
| java16-openj9 | 16 | Debian | OpenJ9 | amd64 |
| multiarch-latest | 15+ | Debian | Hotspot | amd64,arm64,armv7 |
For example, to use Java version 15 on any supported architecture:
docker run --name mc itzg/minecraft-server:java15
> Keep in mind that some versions of Minecraft server can't work on the newest versions of Java. Also, FORGE doesn't support openj9 JVM implementation.
### Deprecated Image Tags
The following image tags have been deprecated and are no longer receiving updates:
- adopt13
- adopt14
- adopt15
- openj9-nightly
## Healthcheck
This image contains [mc-monitor](https://github.com/itzg/mc-monitor) and uses
its `status` command to continually check on the container's. That can be observed
from the `STATUS` column of `docker ps`
```
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
b418af073764 mc "/start" 43 seconds ago Up 41 seconds (healthy) 0.0.0.0:25565->25565/tcp, 25575/tcp mc
```
You can also query the container's health in a script friendly way:
```
> docker container inspect -f "{{.State.Health.Status}}" mc
healthy
```
Some orchestration systems, such as Portainer, don't allow for disabling the default `HEALTHCHECK` declared by this image. In those cases you can approximate the disabling of healthchecks by setting the environment variable `DISABLE_HEALTHCHECK` to `true`.
## Deployment Templates and Examples
### Helm Charts
- itzg Helm Chart:
- [GitHub repo](https://github.com/itzg/minecraft-server-charts)
- [Helm Chart repo](https://itzg.github.io/minecraft-server-charts/)
- [mcsh/server-deployment](https://github.com/mcserverhosting-net/charts)
### Examples
The [examples directory](https://github.com/itzg/docker-minecraft-server/tree/master/examples) also provides examples of deploying the [itzg/minecraft-server](https://hub.docker.com/r/itzg/minecraft-server/) Docker image.
### Amazon Web Services (AWS) Deployment
If you're looking for a simple way to deploy this to the Amazon Web Services Cloud, check out the [Minecraft Server Deployment (CloudFormation) repository](https://github.com/vatertime/minecraft-spot-pricing). This repository contains a CloudFormation template that will get you up and running in AWS in a matter of minutes. Optionally it uses Spot Pricing so the server is very cheap, and you can easily turn it off when not in use.
### 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:
```yml
version: "3"
services:
mc:
image: itzg/minecraft-server
ports:
- 25565:25565
environment:
EULA: "TRUE"
tty: true
stdin_open: true
restart: unless-stopped
```
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 types
### Running a Forge Server
Enable [Forge server](http://www.minecraftforge.net/wiki/) mode by adding a `-e TYPE=FORGE` to your command-line.
The overall version is specified by `VERSION`, [as described in the section above](#versions) and will run the recommended Forge version by default. You can also choose to run a specific Forge version with `FORGEVERSION`, such as `-e FORGEVERSION=14.23.5.2854`.
docker run -d -v /path/on/host:/data \
-e TYPE=FORGE \
-e VERSION=1.12.2 -e FORGEVERSION=14.23.5.2854 \
-p 25565:25565 -e EULA=TRUE --name mc itzg/minecraft-server
To use a pre-downloaded Forge installer, place it in the attached `/data` directory and
specify the name of the installer file with `FORGE_INSTALLER`, such as:
docker run -d -v /path/on/host:/data ... \
-e FORGE_INSTALLER=forge-1.11.2-13.20.0.2228-installer.jar ...
To download a Forge installer from a custom location, such as your own file repository, specify
the URL with `FORGE_INSTALLER_URL`, such as:
docker run -d -v /path/on/host:/data ... \
-e FORGE_INSTALLER_URL=http://HOST/forge-1.11.2-13.20.0.2228-installer.jar ...
In both of the cases above, there is no need for the `VERSION` or `FORGEVERSION` variables.
### Running a Bukkit/Spigot server
Enable Bukkit/Spigot server mode by adding a `-e TYPE=BUKKIT` or `-e TYPE=SPIGOT` to your command-line.
docker run -d -v /path/on/host:/data \
-e TYPE=SPIGOT \
-p 25565:25565 -e EULA=TRUE --name mc itzg/minecraft-server
If you are hosting your own copy of Bukkit/Spigot you can override the download URLs with:
- -e BUKKIT_DOWNLOAD_URL=<url>
- -e SPIGOT_DOWNLOAD_URL=<url>
You can build spigot from source by adding `-e BUILD_FROM_SOURCE=true`
Plugins can either be managed within the `plugins` subdirectory of the [data directory](#data-directory) or you can also [attach a `/plugins` volume](#deploying-plugins-from-attached-volume). If you add plugins while the container is running, you'll need to restart it to pick those up.
[You can also auto-download plugins using `SPIGET_RESOURCES`.](#auto-downloading-spigotmcbukkitpapermc-plugins)
> NOTE some of the `VERSION` values are not as intuitive as you would think, so make sure to click into the version entry to find the **exact** version needed for the download. For example, "1.8" is not sufficient since their download naming expects `1.8-R0.1-SNAPSHOT-latest` exactly.
### Running a Paper server
Enable Paper server mode by adding a `-e TYPE=PAPER` to your command-line.
By default the container will run the latest build of [Paper server](https://papermc.io/downloads)
but you can also choose to run a specific build with `-e PAPERBUILD=205`.
docker run -d -v /path/on/host:/data \
-e TYPE=PAPER \
-p 25565:25565 -e EULA=TRUE --name mc itzg/minecraft-server
If you are hosting your own copy of Paper you can override the download URL with:
- -e PAPER_DOWNLOAD_URL=<url>
An example compose file is provided at
[examples/docker-compose-paper.yml](examples/docker-compose-paper.yml).
If you have attached a host directory to the `/data` volume, then you can install plugins via the `plugins` subdirectory. You can also [attach a `/plugins` volume](#deploying-plugins-from-attached-volume). If you add plugins while the container is running, you'll need to restart it to pick those up.
[You can also auto-download plugins using `SPIGET_RESOURCES`.](#auto-downloading-spigotmcbukkitpapermc-plugins)
### Running a Tuinity server
A [Tuinity](https://github.com/Spottedleaf/Tuinity) server, which is a fork of Paper aimed at improving server performance at high playercounts.
-e TYPE=TUINITY
> **NOTE** only `VERSION=LATEST` is supported
### Running an Airplane server
An [Airplane](https://github.com/TECHNOVE/Airplane) server, which is a fork of Tuinity aimed at further improving server performance at high playercounts.
-e TYPE=AIRPLANE
> NOTE: The `VERSION` variable is used to select an Airplane branch to download from. The available options are "LATEST" "1.17" "1.16" "PURPUR" and "PURPUR-1.16"
Extra variables:
- `AIRPLANE_BUILD=lastSuccessfulBuild` : set a specific Airplane build to use
- `FORCE_REDOWNLOAD=false` : set to true to force the located server jar to be re-downloaded
- `USE_FLARE_FLAGS=false` : set to true to add appropriate flags for the [Flare](https://blog.airplane.gg/flare) profiler
### Running a Purpur server
A [Purpur](https://purpur.pl3x.net/) server, which is "a drop-in replacement for Paper servers designed for configurability, new fun and exciting gameplay features, and high performance built on top of Tuinity."
-e TYPE=PURPUR
> NOTE: the `VERSION` variable is used to lookup a build of Purpur to download
Extra variables:
- `PURPUR_BUILD=LATEST` : set a specific Purpur build to use
- `FORCE_REDOWNLOAD=false` : set to true to force the located server jar to be re-downloaded
### Running a Yatopia server
A [Yatopia](https://github.com/YatopiaMC/Yatopia) server, which is a "blazing fast Tuinity fork with best in class performance".
-e TYPE=YATOPIA
> NOTE: the `VERSION` variable is used to locate the Yatopia version to download
Extra variables:
- `RELEASE=stable` : set to `stable` or `latest`
- `FORCE_REDOWNLOAD=false` : set to true to force the located server jar to be re-downloaded
- `USE_FLARE_FLAGS=false` : set to true to add appropriate flags for the [Flare](https://blog.airplane.gg/flare) profiler
### Running a Magma server
A [Magma](https://magmafoundation.org/) server, which is a combination of Forge and PaperMC, can be used with
-e TYPE=MAGMA
> **NOTE** there are limited base versions supported, so you will also need to set `VERSION`, such as "1.12.2"
### Running a Mohist server
A [Mohist](https://github.com/MohistMC/Mohist) server can be used with
-e TYPE=MOHIST
> **NOTE** there are limited base versions supported, so you will also need to set `VERSION`, such as "1.12.2"
By default the latest build will be used; however, a specific build number can be selected by setting `MOHIST_BUILD`, such as
-e VERSION=1.16.5 -e MOHIST_BUILD=374
### Running a Catserver type server
A [Catserver](http://catserver.moe/) type server can be used with
-e TYPE=CATSERVER
> **NOTE** Catserver only provides a single release stream, so `VERSION` is ignored
### Running an Canyon server
[Canyon](https://github.com/canyonmodded/canyon) is a fork of CraftBukkit for Minecraft Beta 1.7.3. It includes multiple enhancements whilst also retaining compatibility with old Bukkit plugins and mods as much as possible.
-e VERSION=b1.7.3 -e TYPE=CANYON
> **NOTE** only `VERSION=b1.7.3` is supported
> **NOTE** only Java 8 is supported
By default the latest build will be used; however, a specific build number can be selected by setting `CANYON_BUILD`, such as
-e CANYON_BUILD=11
### Running a SpongeVanilla server
Enable SpongeVanilla server mode by adding a `-e TYPE=SPONGEVANILLA` to your command-line.
By default the container will run the latest `STABLE` version.
If you want to run a specific version, you can add `-e SPONGEVERSION=1.11.2-6.1.0-BETA-19` to your command-line.
docker run -d -v /path/on/host:/data -e TYPE=SPONGEVANILLA \
-p 25565:25565 -e EULA=TRUE --name mc itzg/minecraft-server
You can also choose to use the `EXPERIMENTAL` branch.
Just change it with `SPONGEBRANCH`, such as:
$ docker run -d -v /path/on/host:/data ... \
-e TYPE=SPONGEVANILLA -e SPONGEBRANCH=EXPERIMENTAL ...
### Running a Fabric Server
Enable [Fabric server](http://fabricmc.net/use/) mode by adding a `-e TYPE=FABRIC` to your command-line. By default, the container will run the latest version, but you can also choose to run a specific version with `VERSION`.
```
docker run -d -v /path/on/host:/data \
-e TYPE=FABRIC \
-p 25565:25565 -e EULA=TRUE --name mc itzg/minecraft-server
```
A specific installer version can be requested using `FABRIC_INSTALLER_VERSION`.
To use a pre-downloaded Fabric installer, place it in a directory attached into the container, such as the `/data` volume and specify the name of the installer file with `FABRIC_INSTALLER`, such as:
```
docker run -d -v /path/on/host:/data ... \
-e FABRIC_INSTALLER=fabric-installer-0.5.0.32.jar ...
```
To download a Fabric installer from a custom location, such as your own file repository, specify the URL with `FABRIC_INSTALLER_URL`, such as:
```
docker run -d -v /path/on/host:/data ... \
-e FABRIC_INSTALLER_URL=http://HOST/fabric-installer-0.5.0.32.jar ...
```
In order to add mods, you have two options:
## Running a server with a Feed the Beast modpack
> **NOTE** requires one of the Debian based images listed in [the Java versions section](#running-minecraft-server-on-different-java-version).
[Feed the Beast application](https://www.feed-the-beast.com/) modpacks are supported by using `-e TYPE=FTBA` (**note** the "A" at the end of the type). This server type will automatically take care of downloading and installing the modpack and appropriate version of Forge, so the `VERSION` does not need to be specified.
### Environment Variables:
- `FTB_MODPACK_ID`: **required**, the numerical ID of the modpack to install. The ID can be located by [finding the modpack](https://www.feed-the-beast.com/modpack) and using the "ID" displayed next to the name
- `FTB_MODPACK_VERSION_ID`: optional, the numerical Id of the version to install. If not specified, the latest version will be installed. The "Version ID" can be obtained by drilling into the Versions tab and clicking a specific version.
### Upgrading
If a specific `FTB_MODPACK_VERSION_ID` was not specified, simply restart the container to pick up the newest modpack version. If using a specific version ID, recreate the container with the new version ID.
### Example
The following example runs the latest version of [FTB Presents Direwolf20 1.12](https://ftb.neptunepowered.org/pack/ftb-presents-direwolf20-1-12/):
```
docker run -d --name mc-ftb -e EULA=TRUE \
-e TYPE=FTBA -e FTB_MODPACK_ID=31 \
-p 25565:25565 \
itzg/minecraft-server:multiarch
```
> Normally you will also add `-v` volume for `/data` since the mods and config are installed there along with world data.
## Running a server with a CurseForge modpack
Enable this server mode by adding `-e TYPE=CURSEFORGE` to your command-line,
but note the following additional steps needed...
You need to specify a modpack to run, using the `CF_SERVER_MOD` environment
variable. A CurseForge server modpack is available together with its respective
client modpack at <https://www.curseforge.com/minecraft/modpacks> .
Now you can add a `-e CF_SERVER_MOD=name_of_modpack.zip` to your command-line.
docker run -d -v /path/on/host:/data -e TYPE=CURSEFORGE \
-e CF_SERVER_MOD=SkyFactory_4_Server_4.1.0.zip \
-p 25565:25565 -e EULA=TRUE --name mc itzg/minecraft-server
If you want to keep the pre-download modpacks separate from your data directory,
then you can attach another volume at a path of your choosing and reference that.
The following example uses `/modpacks` as the container path as the pre-download area:
docker run -d -v /path/on/host:/data -v /path/to/modpacks:/modpacks \
-e TYPE=CURSEFORGE \
-e CF_SERVER_MOD=/modpacks/SkyFactory_4_Server_4.1.0.zip \
-p 25565:25565 -e EULA=TRUE --name mc itzg/minecraft-server
### Modpack data directory
By default, CurseForge modpacks are expanded into the sub-directory `/data/FeedTheBeast` and executed from there. (The default location was chosen for legacy reasons, when Curse and FTB were maintained together.)
The directory can be changed by setting `CF_BASE_DIR`, such as `-e CF_BASE_DIR=/data`.
### Buggy start scripts
Some modpacks have buggy or overly complex start scripts. You can avoid using the bundled start script and use this image's standard server-starting logic by adding `-e USE_MODPACK_START_SCRIPT=false`.
### 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
## Working with mods and plugins
### Optional plugins, mods, and config attach points
There are optional volume paths that can be attached to supply content to be copied into the data area:
`/plugins`
: contents are copied into `/data/plugins` for Bukkit related server types. Set `PLUGINS_SYNC_UPDATE=false` if you want files from `/plugins` to take precedence over newer files in `/data/plugins`.
`/mods`
: contents are copied into `/data/mods` for Forge related server types
`/config`
: contents are copied into `/data/config` by default, but can be changed with `COPY_CONFIG_DEST`
If you want old mods/plugins to be removed before the content is brought over from those attach points, then add `-e REMOVE_OLD_MODS=TRUE`. You can fine tune the removal process by specifying the `REMOVE_OLD_MODS_INCLUDE` and `REMOVE_OLD_MODS_EXCLUDE` variables. By default, everything will be removed. You can also specify the `REMOVE_OLD_MODS_DEPTH` (default is 16) variable to only delete files up to a certain level.
For example: `-e REMOVE_OLD_MODS=TRUE -e REMOVE_OLD_MODS_INCLUDE="*.jar" -e REMOVE_OLD_MODS_DEPTH=1` will remove all old jar files that are directly inside the `plugins/` or `mods/` directory.
You can specify the destination of the files that are copied from `/mods` and `/config` by setting the `COPY_MODS_DEST` and `COPY_CONFIG_DEST`, where the default is `/data/mods` and `/data/config`. For example, `-v ./config:/config -e COPY_CONFIG_DEST=/data` will allow you to copy over files like `bukkit.yml` and so on directly into the server directory.
These paths work well if you want to have a common set of modules in a separate location, but still have multiple worlds with different server requirements in either persistent volumes or a downloadable archive.
> For more flexibility with mods/plugins preparation, you can declare directories to use in [the `MODS` variable](#downloadable-modplugin-pack-for-forge-bukkit-and-spigot-servers)
### Auto-downloading SpigotMC/Bukkit/PaperMC plugins
The `SPIGET_RESOURCES` variable can be set with a comma-separated list of SpigotMC resource IDs to automatically download [SpigotMC resources/plugins](https://www.spigotmc.org/resources/) using [the spiget API](https://spiget.org/). Resources that are zip files will be expanded into the plugins directory and resources that are simply jar files will be moved there.
> NOTE: the variable is purposely spelled SPIG**E**T with an "E"
The **resource ID** can be located from the numerical part of the URL after the shortname and a dot. For example, the ID is **9089** from
https://www.spigotmc.org/resources/essentialsx.9089/
====
For example, the following will auto-download the [EssentialsX](https://www.spigotmc.org/resources/essentialsx.9089/) and [Vault](https://www.spigotmc.org/resources/vault.34315/) plugins:
-e SPIGET_RESOURCES=9089,34315
### Downloadable mod/plugin pack for Forge, Bukkit, and Spigot Servers
Like the `WORLD` option above, you can specify the URL or path 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 or copy over individual mods using the `MODS` environment variable. `MODS` contains a comma-separated list of
- URL of a jar file
- container path to a jar file
- container path to a directory containing jar files
docker run -d -e MODS=https://www.example.com/mods/mod1.jar,/plugins/common,/plugins/special/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.
## Working with world data
### Downloadable world
Instead of mounting the `/data` volume, you can instead specify the URL of a ZIP file containing an archived world. It will be searched for a file `level.dat` and the containing subdirectory moved to the directory named by `$LEVEL`. This means that most of the archived Minecraft worlds downloadable from the Internet will already be in the correct format.
docker run -d -e WORLD=http://www.example.com/worlds/MySave.zip ...
**NOTE:** This URL must be accessible from inside the container. Therefore,
you should use an IP address or a globally resolvable FQDN, or else the
name of a linked container.
**NOTE:** If the archive contains more than one `level.dat`, then the one to select can be picked with `WORLD_INDEX`, which defaults to 1.
### Cloning world from a container path
The `WORLD` option can also be used to reference a directory or zip file that will be used as a source to clone or unzip 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
```
### Overwrite world on start
The world will only be downloaded or copied if it doesn't exist already. Set `FORCE_WORLD_COPY=TRUE` to force overwrite the world on every server start.
## 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
> **WARNING:** 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. Use `-p` port mappings instead.
If you must, the server port can be set like:
docker run -d -e SERVER_PORT=25566 ...
**however**, be sure to change your port mapping accordingly and be prepared for some features to break.
### 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.
> NOTE: When `WHITELIST` is used the server properties `white-list` and `whitelist` will automatically get set to `true`.
> By default, the players in `WHITELIST` are **added** to the final `whitelist.json` file by the Minecraft server. If you set `OVERRIDE_WHITELIST` to "true" then the `whitelist.json` file will be recreated on each server startup.
Alternatively, you can set `ENABLE_WHITELIST=true` to only set the server properties `white-list` and `whitelist` without modifying the whitelist file. In this case the whitelist is solely managed using the `whitelist add` and `whitelist remove` commands.
### 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 ...
> By default, the players in `OPS` are **added** to the final `ops.json` file by the Minecraft server. If you set `OVERRIDE_OPS` to "true" then the `ops.json` file will be recreated on each server startup.
### 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 ...
The server icon which has been set doesn't get overridden by default. It can be changed and overridden by setting `OVERRIDE_ICON` to `TRUE`.
docker run -d -e ICON=http://..../some/other/image.png -e OVERRIDE_ICON=TRUE...
### 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
### Set spawn protection
Sets the area that non-ops can not edit (0 to disable)
docker run -d -e SPAWN_PROTECTION=0
### 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
-e SEED=1785852800490497919
If using a negative value for the seed, make sure to quote the value such as:
-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
-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
That way you can easily differentiate between several servers you may have started.
### 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, for example
- DEFAULT
- FLAT
- LARGEBIOMES
- AMPLIFIED
- CUSTOMIZED
- BUFFET
- BIOMESOP (Biomes O' Plenty for 1.12 and older)
- BIOMESOPLENTY (Biomes O' Plenty for 1.15 and above)
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.**
For example (just the `-e` bits):
-e LEVEL_TYPE=flat -e 'GENERATOR_SETTINGS=3;minecraft:bedrock,3*minecraft:stone,52*minecraft:sandstone;2;'
### Custom Server Resource Pack
You can set a link to a custom resource pack and set it's checksum using the `RESOURCE_PACK` and `RESOURCE_PACK_SHA1` options respectively, the default is blank:
docker run -d -e 'RESOURCE_PACK=http\://link.com/to/pack.zip?\=1' -e 'RESOURCE_PACK_SHA1=d5db29cd03a2ed055086cef9c31c252b4587d6d0'
**NOTE:** `:` and `=` must be escaped using `\`. The checksum plain-text hexadecimal.
### Level / World Save Name
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.
> **INFO** Refer to the [data directory](#data-directory) section for a visual description of where the `$LEVEL` directory is situated.
### 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
### Other server property mappings
| Environment Variable | Server Property |
| --------------------------------- | --------------------------------- |
| PLAYER_IDLE_TIMEOUT | player-idle-timeout |
| BROADCAST_CONSOLE_TO_OPS | broadcast-console-to-ops |
| BROADCAST_RCON_TO_OPS | broadcast-rcon-to-ops |
| 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 |
| ENFORCE_WHITELIST | enforce-whitelist |
| ENABLE_WHITELIST | white-list and whitelist |
## Miscellaneous Options
### Replacing variables inside configs
Sometimes you have mods or plugins that require configuration information that is only available at runtime.
For example if you need to configure a plugin to connect to a database,
you don't want to include this information in your Git repository or Docker image.
Or maybe you have some runtime information like the server name that needs to be set
in your config files after the container starts.
For those cases there is the option to replace defined variables inside your configs
with environment variables defined at container runtime.
If you set the enviroment variable `REPLACE_ENV_VARIABLES` to `TRUE` the startup script
will go thru all files inside your `/data` volume and replace variables that match your
defined environment variables. Variables that you want to replace need to be wrapped
inside `${YOUR_VARIABLE}` curly brackets and prefixed with a dollar sign. This is the regular
syntax for enviromment variables inside strings or config files.
Optionally you can also define a prefix to only match predefined environment variables.
`ENV_VARIABLE_PREFIX="CFG_"` <-- this is the default prefix
If you want use file for value (like when use secrets) you can add suffix `_FILE` to your variable name (in run command).
There are some limitations to what characters you can use.
| Type | Allowed Characters |
| ----- | ------------------- |
| Name | `0-9a-zA-Z_-` |
| Value | `0-9a-zA-Z_-:/=?.+` |
Variables will be replaced in files with the following extensions:
`.yml`, `.yaml`, `.txt`, `.cfg`, `.conf`, `.properties`.
Specific files can be excluded by listing their name (without path) in the variable `REPLACE_ENV_VARIABLES_EXCLUDES`.
Paths can be excluded by listing them in the variable `REPLACE_ENV_VARIABLES_EXCLUDE_PATHS`. Path
excludes are recursive. Here is an example:
```
REPLACE_ENV_VARIABLES_EXCLUDE_PATHS="/data/plugins/Essentials/userdata /data/plugins/MyPlugin"
```
Here is a full example where we want to replace values inside a `database.yml`.
```yml
---
database:
host: ${CFG_DB_HOST}
name: ${CFG_DB_NAME}
password: ${CFG_DB_PASSWORD}
```
This is how your `docker-compose.yml` file could look like:
```yml
version: "3.8"
# Other docker-compose examples in /examples
services:
minecraft:
image: itzg/minecraft-server
ports:
- "25565:25565"
volumes:
- "mc:/data"
environment:
EULA: "TRUE"
ENABLE_RCON: "true"
RCON_PASSWORD: "testing"
RCON_PORT: 28016
# enable env variable replacement
REPLACE_ENV_VARIABLES: "TRUE"
# define an optional prefix for your env variables you want to replace
ENV_VARIABLE_PREFIX: "CFG_"
# and here are the actual variables
CFG_DB_HOST: "http://localhost:3306"
CFG_DB_NAME: "minecraft"
CFG_DB_PASSWORD_FILE: "/run/secrets/db_password"
restart: always
rcon:
image: itzg/rcon
ports:
- "4326:4326"
- "4327:4327"
volumes:
- "rcon:/opt/rcon-web-admin/db"
volumes:
mc:
rcon:
secrets:
db_password:
file: ./db_password
```
The content of `db_password`:
ug23u3bg39o-ogADSs
### Running with a custom server JAR
If you would like to run a custom server JAR, set `-e TYPE=CUSTOM` and pass the custom server
JAR via `CUSTOM_SERVER`. It can either be a URL or a container path to an existing JAR file.
If it is a URL, it will only be downloaded into the `/data` directory if it wasn't already. As
such, if you need to upgrade or re-download the JAR, then you will need to stop the container,
remove the file from the container's `/data` directory, and start again.
### Force re-download of the server file
For VANILLA, FORGE, BUKKIT, SPIGOT, PAPER, CURSEFORGE, SPONGEVANILLA server types, set
`$FORCE_REDOWNLOAD` to some value (e.g. 'true) to force a re-download of the server file for
the particular server type. by adding a `-e FORCE_REDOWNLOAD=true` to your command-line.
For example, with PaperSpigot, it would look something like this:
```
docker run -d -v /path/on/host:/data \
-e TYPE=PAPER -e FORCE_REDOWNLOAD=true \
-p 25565:25565 -e EULA=TRUE --name mc itzg/minecraft-server
```
### 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 an initial and maximum Java memory-heap 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 heap 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]`. For example:
-e MEMORY=2G
> NOTE: the settings above only set the Java **heap** limits. Memory resource requests and limits on the overall container should also account for non-heap memory usage. An extra 25% is [a general best practice](https://dzone.com/articles/best-practices-java-memory-arguments-for-container).
### 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`.
### Interactive and Color Console
If you would like to `docker attach` to the Minecraft server console with color and interactive capabilities, then add
```
-e EXEC_DIRECTLY=true
```
> **NOTES**
>
> This feature doesn't work via rcon, so you will need to `docker attach` to the container. Use the sequence Ctrl-P, Ctrl-Q to detach.
>
> This will bypass graceful server shutdown handling when using `docker stop`, so be sure the server console's `stop` command.
>
> Make to enable stdin and tty with `-it` when using `docker run` or `stdin_open: true` and `tty: true` when using docker compose.
### OpenJ9 Specific Options
The openj9 image tags include specific variables to simplify configuration:
- `-e TUNE_VIRTUALIZED=TRUE` : enables the option to
[optimize for virtualized environments](https://www.eclipse.org/openj9/docs/xtunevirtualized/)
- `-e TUNE_NURSERY_SIZES=TRUE` : configures nursery sizes where the initial size is 50%
of the `MAX_MEMORY` and the max size is 80%.
### Enabling 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 using:
```
-e ENABLE_ROLLING_LOGS=true
```
> **NOTE** this will interfere with interactive/color consoles [as described in the section above](#interactive-and-color-console)
## Timezone Configuration
You can configure the timezone to match yours by setting the `TZ` environment variable:
-e TZ=Europe/London
such as:
docker run -d -it -e TZ=Europe/London -p 25565:25565 --name mc itzg/minecraft-server
Or mounting `/etc/timezone` as readonly (not supported on Windows):
-v /etc/timezone:/etc/timezone:ro
such as:
docker run -d -it -v /etc/timezone:/etc/timezone:ro -p 25565:25565 --name mc itzg/minecraft-server
### Enable Remote JMX for Profiling
To enable remote JMX, such as for profiling with VisualVM or JMC, add the environment variable `ENABLE_JMX=true`, set `JMX_HOST` to the IP/host running the Docker container, and add a port forwarding of TCP port 7091, such as:
```
-e ENABLE_JMX=true -e JMX_HOST=$HOSTNAME -p 7091:7091
```
### Enable Aikar's Flags
[Aikar has does some research](https://mcflags.emc.gs/) into finding the optimal JVM flags for GC tuning, which becomes more important as more users are connected concurrently. The set of flags documented there can be added using
-e USE_AIKAR_FLAGS=true
When `MEMORY` is greater than or equal to 12G, then the Aikar flags will be adjusted according to the article.
Large page support can also be enabled by adding
-e USE_LARGE_PAGES=true
### 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](examples/docker-compose-proxied.yml) it references
a companion squid proxy by setting the equivalent of
-e PROXY=proxy:3128
### Using "noconsole" option
Some older versions (pre-1.14) of Spigot required `--noconsole` to be passed when detaching stdin, which can be done by setting `-e CONSOLE=FALSE`.
### Explicitly disable GUI
Some older servers get confused and think that the GUI interface is enabled. You can explicitly
disable that by passing `-e GUI=FALSE`.
### 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. By default it waits 60 seconds, but that duration can be configured by setting the environment variable `STOP_DURATION` to the number of seconds.
## Autopause
### Description
There are various bug reports on [Mojang](https://bugs.mojang.com) about high CPU usage of servers with newer versions, even with few or no clients connected (e.g. [this one](https://bugs.mojang.com/browse/MC-149018), in fact the functionality is based on [this comment in the thread](https://bugs.mojang.com/browse/MC-149018?focusedCommentId=593606&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-593606)).
An autopause functionality has been added to this image to monitor whether clients are connected to the server. If for a specified time no client is connected, the Java process is stopped. When knocking on the server port (e.g. by the ingame Multiplayer server overview), the process is resumed. The experience for the client does not change.
Of course, even loaded chunks are not ticked when the process is stopped.
**You must greatly increase or disable max-tick-time watchdog functionality.** From the server's point of view, the pausing causes a single tick to take as long as the process is stopped, so the server watchdog might intervene after the process is continued, possibly forcing a container restart. To prevent this, ensure that the `max-tick-time` in the `server.properties` file is set to a very large value or -1 to disable it entirely, which is highly recommended. That can be set with `MAX_TICK_TIME` as described in [the section below](#max-tick-time).
> **NOTE:** Non-vanilla versions might have their own configuration file, you might have to disable their watchdogs separately. For PaperMC servers, you need to send the JVM flag `-Ddisable.watchdog=true`, this can be done with the docker env variable `-e JVM_DD_OPTS=disable.watchdog:true`
On startup the `server.properties` file is checked and, if applicable, a warning is printed to the terminal. When the server is created (no data available in the persistent directory), the properties file is created with the Watchdog disabled.
The utility used to wake the server (`knock(d)`) works at network interface level. So the correct interface has to be set using the `AUTOPAUSE_KNOCK_INTERFACE` variable when using non-default networking environments (e.g. host-networking, Portainer oder NAS solutions). See the description of the variable below.
A starting, example compose file has been provided in [examples/docker-compose-autopause.yml](examples/docker-compose-autopause.yml).
### Enabling Autopause
Enable the Autopause functionality by setting:
```
-e ENABLE_AUTOPAUSE=TRUE
```
The following environment variables define the behaviour of auto-pausing:
* `AUTOPAUSE_TIMEOUT_EST`, default `3600` (seconds)
describes the time between the last client disconnect and the pausing of the process (read as timeout established)
* `AUTOPAUSE_TIMEOUT_INIT`, default `600` (seconds)
describes the time between server start and the pausing of the process, when no client connects inbetween (read as timeout initialized)
* `AUTOPAUSE_TIMEOUT_KN`, default `120` (seconds)
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 inbetween (read as timeout knocked)
* `AUTOPAUSE_PERIOD`, default `10` (seconds)
describes period of the daemonized state machine, that handles the pausing of the process (resuming is done independently)
* `AUTOPAUSE_KNOCK_INTERFACE`, default `eth0`
<br>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.
## Running on RaspberryPi
To run this image on a RaspberryPi 3 B+, 4, or newer, use any of the image tags [list in the Java version section](#running-minecraft-server-on-different-java-version) that specify `armv7` for the architecture, which includes `itzg/minecraft-server:latest`.
> NOTE: you may need to lower the memory allocation, such as `-e MEMORY=750m`
> If experiencing issues such as "sleep: cannot read realtime clock: Operation not permitted", ensure `libseccomp` is up to date on your host. In some cases adding `:Z` flag to the `/data` mount may be needed, [but use cautiously](https://docs.docker.com/storage/bind-mounts/#configure-the-selinux-label).
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