2.5 KiB
Build arguments
Two build arguments are required, namely MC_VERSION and PAPERMC_VERSION.
You can find your required versions here. The
PaperMC Version is the number starting with the #. Do note that this script
only works with the currently supported Minecraft version, and not any of the
legacy jars.
You can then specify the versions in the .env file:
MC_VERSION=1.16.4
PAPERMC_VERSION=352
Note that the leading # doesn't need to be added to the variable.
Environment variables
The two possible environment variables are XMS and XMX. These specify the
initial RAM & maximum RAM usage respectively. Only XMS is required; XMX is
just set to the same value as XMS if not specified. You must specify them as
a number, e.g. XMS=4. This number represents a quantity of gigabytes.
Mount points
There a two useful mount points defined:
/mc/config: this is where all server config files reside./mc/worlds: this is where the world files are stored.
You can mount these directories somewhere in the host file system by specifying
the mount paths in the .env file. These can be both absolute or relative
paths.
Other config variables
The only other config variable is PORT. This specifies on what port your
server will be discoverable over the internet. The default Minecraft port is
25565.
Java flags
I use the Java flags defined
here.
If you don't agree with this decision, you can change the ENTRYPOINT at the
end of the Dockerfile to the following:
ENTRYPOINT java \
-Xms"${XMS}G" \
-Xmx"${XMX:-$XMS}G" \
-jar /mc/server.jar \
--universe /mc/worlds \
--nogui
This will only use the flags absolutely necessary, while still allowing you to tweak the memory variables.