This a simple docker-compose for quickly spinning up a Minecraft-Server(java-edition) without opening a port in your router through ngrok. Default version is 1.20.4

This compose uses two containers. One provides ngrok tunneling to avoid port-forwarding, the other one is the Minecraft-server. As a best practive you should always read a Dockerfile before running it:

• docker-compose
• minecraft-server Dockerfile
• entrypoint.sh

You will need to set NGROK_AUTHTOKEN to your ngrok-auth-token. You can also specify it in your compose file. The IP of the server is going to be visible on http://localhost:4040; the ngrok status-page.

The newest version is currently 1.20.4. Here is the list of links to the official Minecraft server-jars (versions.csv)
Currently, the server.jar is downloaded during build. The version has to be specified in docker-compose as a the build-arg MINECRAFT_VERSION: 1.20.4
You can add links to your own server.jar's to versions.csv. The list can be updated with the getServerVersions.py script, the repo will try to update once a week with a github action.
Your Minecraft-Server will be accessible through ngrok, as well as on localhost:25566

You will need to accept the Minecraft eula:

• set eula=true in the environment section of the compose

The command-line oft the Minecraft server is usually available through the following command, but be aware that ctrl+c kills the server. USE CTRL-P+CTRL+Q to exit instead

docker attach minecraft-server-ngrok_minecraft_1

You can put your very own Minecraft-server-folder in the minecraft-data directory, which is going to be created by docker.

• Set NGROK_AUTHTOKEN
• Edit eula from false to eula=true in docker-compose
• Run docker-compose up -d --build
• Open http://localhost:4040 and copy url without tcp://
• Join the server
• Run docker attach minecraft-server-ngrok_minecraft_1
• Type op <your_username>