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# Build arguments
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Only one build argument is required, namely `FABRIC_VERSION`. This is the
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version of Fabric you wish to install. You can find the list of versions
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[here](https://fabricmc.net/use/). For example, you can then set
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`FABRIC_VERSION=0.6.1.51` in the `.env` file.
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# Environment variables
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The two possible environment variables are `XMS` and `XMX`. These specify the
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initial RAM & maximum RAM usage, respectively. Only `XMS` is required; `XMX` is
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just set to the same value as `XMS` if not specified. You must specify them as
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a number, e.g. `XMS=4`. This number represents a quantity of gigabytes.
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2020-12-30 16:43:58 +01:00
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# Mount points
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There a three useful mount points defined:
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* `/mc/config`: this is where all server config files reside.
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* `/mc/config/mods`: this is where all mods should be placed.
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* `/mc/worlds`: this is where the world files are stored.
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You can mount these directories somewhere in the host file system by specifying
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the mount paths in the `.env` file. These can be both absolute or relative
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paths.
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2020-12-30 16:43:58 +01:00
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# Other config variables
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The only other config variable is `PORT`. This specifies on what port your
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server will be discoverable over the internet. The default Minecraft port is
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`25565`.
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2020-12-30 16:43:58 +01:00
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# Java flags
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I use the Java flags defined
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[here](https://aikar.co/2018/07/02/tuning-the-jvm-g1gc-garbage-collector-flags-for-minecraft/).
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If you don't agree with this decision, you can change the `ENTRYPOINT` at the
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end of the `Dockerfile` to the following:
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```
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ENTRYPOINT java \
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-Xms"${XMS}G" \
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-Xmx"${XMX:-$XMS}G" \
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-jar fabric-server-launch.jar \
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--universe /mc/worlds \
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--nogui
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```
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This will only use the flags absolutely necessary, while still allowing you to
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tweak the memory variables.
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