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89 lines
3.6 KiB
Markdown
89 lines
3.6 KiB
Markdown
Everything the container manages is located under the **container's** `/data` path, as shown here:
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!!! note
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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.
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### Attaching data directory to host filesystem
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In most cases the easiest way to persist and work with the minecraft data files is to use [bind mounts](https://docs.docker.com/storage/bind-mounts/) with the `-v` argument to map a directory on your host machine to the container's `/data` directory. In the following example, the path `/home/user/minecraft-data` **must be** a directory on your host machine:
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-v /home/user/minecraft-data:/data
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------------------------- -----
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| +-- must always be /data
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+-- replace with a directory on your host machine
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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.
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!!! important "Rootless, Podman, SELinux, AppArmor usage"
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When running rootless containers, such as with Podman, or using SELinux / AppArmor on your system, append ":Z" to the volume mapping. For example:
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```
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/home/user/minecraft-data:/data:Z
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```
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There might be a safer/better way to accommodate these systems. Please post an issue or PR if you have more information.
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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.
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``` yaml title="docker-compose.yml"
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services:
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mc:
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image: itzg/minecraft-server
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ports:
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- 25565:25565
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environment:
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EULA: "TRUE"
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tty: true
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stdin_open: true
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restart: unless-stopped
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volumes:
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# attach a directory relative to the directory containing this compose file
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- ./minecraft-data:/data
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```
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### Converting anonymous `/data` volume to named volume
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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.
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!!! note
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In this example, it is assumed the original container was given a `--name` of "mc", so change the container identifier accordingly.
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You can also locate the Docker-managed directory from the `Source` field obtained from `docker inspect <container id or name> -f "{{json .Mounts}}"`
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First, stop the existing container:
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``` shell
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docker stop mc
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```
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Use a temporary container to copy over the anonymous volume's content into a named volume, "mc" in this case:
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``` shell
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docker run --rm --volumes-from mc -v mc:/new alpine cp -avT /data /new
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```
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Now you can recreate the container with any environment variable changes, etc by attaching the named volume created from the previous step:
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``` shell
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docker run -d -it --name mc-new -v mc:/data -p 25565:25565 -e EULA=TRUE -e MEMORY=2G itzg/minecraft-server
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```
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### Locating filesystem path of anonymous volume
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The `Source` field from the output of this command will show where the anonymous volume is mounted from:
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``` shell
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docker inspect -f "{{json .Mounts}}" CONTAINER_NAME_OR_ID
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```
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!!! note
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On Windows with WSL the volumes path is `\\wsl$\docker-desktop-data\data\docker\volumes`
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