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Running Minecraft on a different Java version (#450)

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Co-authored-by: Geoff Bourne <itzgeoff@gmail.com>
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@ -118,11 +118,30 @@ or a specific version:
docker run -d -e VERSION=1.7.9 ... docker run -d -e VERSION=1.7.9 ...
When using "LATEST" or "SNAPSHOT" an upgrade can be performed by simply restarting the container. 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 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 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._ 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 | Description | Linux |
|---------|-------------|-------|
| latest | **Default**. Uses Java version 8 update 212 | Alpine Linux |
| adopt13 | Uses Java version 13 latest update | Alpine Linux |
| adopt11 | Uses Java version 11 latest update | Alpine Linux |
| openj9 | Uses Eclipse OpenJ9 JVM | Alpine Linux |
| openj9-nightly | Uses Eclipse OpenJ9 JVM testing builds | Alpine Linux |
| multiarch | Uses Java version 8 latest update | Debian Linux |
For example, to use a Java version 13:
docker run --name mc itzg/minecraft-server:adopt13
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.
## Healthcheck ## Healthcheck
This image contains [Dinnerbone's mcstatus](https://github.com/Dinnerbone/mcstatus) and uses This image contains [Dinnerbone's mcstatus](https://github.com/Dinnerbone/mcstatus) and uses
@ -229,7 +248,7 @@ For those cases there is the option to replace defined variables inside your con
with environment variables defined at container runtime. with environment variables defined at container runtime.
If you set the enviroment variable `REPLACE_ENV_VARIABLES` to `TRUE` the startup script 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 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 defined environment variables. Variables that you want to replace need to be wrapped
inside `${YOUR_VARIABLE}` curly brackets and prefixed with a dollar sign. This is the regular inside `${YOUR_VARIABLE}` curly brackets and prefixed with a dollar sign. This is the regular
syntax for enviromment variables inside strings or config files. syntax for enviromment variables inside strings or config files.
@ -389,7 +408,7 @@ If you are hosting your own copy of PaperSpigot you can override the download UR
You can install Bukkit plugins in two ways... You can install Bukkit plugins in two ways...
An example compose file is provided at An example compose file is provided at
[examples/docker-compose-paper.yml](examples/docker-compose-paper.yml). [examples/docker-compose-paper.yml](examples/docker-compose-paper.yml).
### Using the /data volume ### Using the /data volume
@ -440,7 +459,7 @@ variable. An FTB/CurseForge server modpack is available together with its respec
client modpack on https://www.feed-the-beast.com under "Additional Files." Similar you can client modpack on https://www.feed-the-beast.com under "Additional Files." Similar you can
locate the modpacks for CurseForge at https://minecraft.curseforge.com/modpacks . locate the modpacks for CurseForge at https://minecraft.curseforge.com/modpacks .
There are a couple of options for obtaining an FTB/CurseForge modpack. There are a couple of options for obtaining an FTB/CurseForge modpack.
One options is that you can pre-download the **server** modpack and copy the modpack to the `/data` One options is that you can pre-download the **server** modpack and copy the modpack to the `/data`
directory (see "Attaching data directory to host filesystem”). directory (see "Attaching data directory to host filesystem”).
@ -615,16 +634,16 @@ in either persistent volumes or a downloadable archive.
## Running with a custom server JAR ## 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 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. 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 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, 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. remove the file from the container's `/data` directory, and start again.
## Force re-download of the server file ## Force re-download of the server file
For VANILLA, FORGE, BUKKIT, SPIGOT, PAPER, CURSEFORGE, SPONGEVANILLA server types, set For VANILLA, FORGE, BUKKIT, SPIGOT, PAPER, CURSEFORGE, SPONGEVANILLA server types, set
`$FORCE_REDOWNLOAD` to some value (e.g. 'true) to force a re-download of the server file for `$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. 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: For example, with PaperSpigot, it would look something like this:
@ -831,7 +850,7 @@ Determines if monsters will be spawned.
Determines if villagers will be spawned. Determines if villagers will be spawned.
docker run -d -e SPAWN_NPCS=true docker run -d -e SPAWN_NPCS=true
### Set spawn protection ### Set spawn protection
Sets the area that non-ops can not edit (0 to disable) Sets the area that non-ops can not edit (0 to disable)
@ -960,7 +979,7 @@ from `/worlds/basic`. Also notice in the example that you can use a
read-only volume attachment to ensure the clone source remains pristine. read-only volume attachment to ensure the clone source remains pristine.
``` ```
docker run ... -v $HOME/worlds:/worlds:ro -e WORLD=/worlds/basic docker run ... -v $HOME/worlds:/worlds:ro -e WORLD=/worlds/basic
``` ```
### Downloadable mod/plugin pack for Forge, Bukkit, and Spigot Servers ### Downloadable mod/plugin pack for Forge, Bukkit, and Spigot Servers
@ -978,7 +997,7 @@ particular `TYPE` of server you are running.
You may also download individual mods using the `MODS` environment variable and supplying the URL 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. 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 ... docker run -d -e MODS=https://www.example.com/mods/mod1.jar,https://www.example.com/mods/mod2.jar ...
### Remove old mods/plugins ### Remove old mods/plugins
@ -990,7 +1009,7 @@ To use this option pass the environment variable `REMOVE_OLD_MODS="TRUE"`, such
docker run -d -e REMOVE_OLD_MODS="TRUE" -e MODPACK=http://www.example.com/mods/modpack.zip ... 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 **WARNING:** All content of the `mods` or `plugins` directory will be deleted
before unpacking new content from the MODPACK or MODS. before unpacking new content from the MODPACK or MODS.
### Online mode ### Online mode
@ -1039,7 +1058,7 @@ environment variable. Options like `-X` that need to proceed general JVM options
via a `JVM_XX_OPTS` environment variable. 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: 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`. `JVM_DD_OPTS=fml.queryResult:confirm`, and will be converted to `-Dfml.queryResult=confirm`.
### HTTP Proxy ### HTTP Proxy