Auto-mappings for host paths in bind mount option
Nobody has claimed this yet.
- Dominant language
- Go
- Stars
- 6.1k
- Forks
- 2.2k
- Avg merge
- 1d 15h
- Merged PRs (30d)
- 43
Description
Description
It would be nice if .docker/config.json has a configuration to convert
docker run -v /path/to/somewhere/foo:/workspace
to
docker run -v /anotherpath/foo:/workspace
automatically.
Background
My machine is Windows and I'm running a docker daemon on WSL2 distribution (Ubuntu-20.04). That's not Docker Desktop but a standard docker daemon for Ubuntu, installed following the instructions in https://docs.docker.com/engine/install/ubuntu/ .
WSL2 distribution can access Windows filesystems on /mnt/c (via SMB). That means,
docker run -v /mnt/c/Users/ikedam/Desktop/work:/workspace ...
allows launch a container accessing files on Windows. I want to launch the container from Windows with:
docker run -v "C:\\Users\\ikedam\\Desktop\\work:/workspace" ...
or:
docker run -v ".\\work:/workspace" ...
This feature allows that.
Compared to Docker Desktop
Docker Desktop (for Windows) also provides a feature to bind-mount windows filesystems.
Pros in Docker Desktop:
- Rich UI.
- Provides everything for docker suite. It contains not only docker daemon, but also
dockercli anddocker-composecli. - Easy to setup. Users don't have to know about details of docker backends.
- Docker feature gets available not only to Windows, but also to all WSL2 distributions.
- Auto port mapping for published port to the public IP address.
- Note:
127.0.0.1on WSL2 is accessible also from Windows via127.0.0.1. So this pros in Docker Desktop is only when the user wants to publish ports to a public network interface.
- Note:
- Transparent conversion between filesystems. E.g. running
docker inspecton Windows outputsC:\\...for bind mounts. This feature doesn't support that.
Cons in Docker Desktop
- Slow to start. (Maybe for GUI features?)
- Requires updating all components to update a specific component. For example, when I want to introduce the latest
docker-composefor a bug fix, I have to wait for the next release of Docker Desktop and have to update not onlydocker-composebut whole Docker Desktop. - No way to downgrade.
- Unfortunately, new versions of Docker Desktop so often introduce new bugs, and they are often critical ones. You can't downgrade to the previous version once you upgrade to a new version. And the only way to recover your Docker Desktop is to uninstall it once and reinstall the previous one. Of course, all data in docker (images, containers, volumes) are removed.
- Updating Docker Desktop is really risky for this reason.
- Docker Desktop is not a open-source and developers can't fix the problem nor find a workaround by themselves.
I believe Docker Desktop is useful, but often costs too much.
Configuration example
Just like the proxies member in config.json (https://docs.docker.com/network/proxy/#configure-the-docker-client):
{
"bindMaps": {
"default": {
"C:\\:/mnt/c/"
}
}
}
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the docker run bind-mount option and the .docker/config.json proxies configuration referenced in the issue. Trace how host paths are handled, then determine the scope and expected behavior of the proposed bindMaps setting for Windows and WSL2; done means configured mappings are applied consistently.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- docker, go
- Domain
- cli
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 25/100