docker-compose bind mount docker.sock not a valid Windows path

[ameier38]

Expected behavior

Should be able to bind mount the docker socket as explained
in http://jpetazzo.github.io/2015/09/03/do-not-use-docker-in-docker-for-ci/ using docker-compose

Actual behavior

I can successfully run the command

docker run -v /var/run/docker.sock:/var/run/docker.sock -it docker

But when I try to use within a docker-compose.yml file I get the following error

Creating docker_docker_1 ... error

ERROR: for docker_docker_1  Cannot create container for service docker: b'Mount denied:\nThe source path "\\\\var\\\\run\\\\docker.sock:/var/run/docker.sock"\nis not a valid Windows path'

ERROR: for docker  Cannot create container for service docker: b'Mount denied:\nThe source path "\\\\var\\\\run\\\\docker.sock:/var/run/docker.sock"\nis not a valid Windows path'
ERROR: Encountered errors while bringing up the project.

Information

Docker Community Edition

Version 18.03.0-ce-rc3-win56 (16433)
Channel: edge
b6990be

Note: Just updated Docker and I did not receive this error in previous version.

docker-compose.yml

version: '3'
services:
    docker:
        image: docker
        stdin_open: true
        tty: true
        volumes:
            - /var/run/docker.sock:/var/run/docker.sock

Running docker-compose up gives the following error

λ  docker-compose up
Creating docker_docker_1 ... error

ERROR: for docker_docker_1  Cannot create container for service docker: b'Mount denied:\nThe source path "\\\\var\\\\run\\\\docker.sock:/var/run/docker.sock"\nis not a valid Windows path'

ERROR: for docker  Cannot create container for service docker: b'Mount denied:\nThe source path "\\\\var\\\\run\\\\docker.sock:/var/run/docker.sock"\nis not a valid Windows path'
ERROR: Encountered errors while bringing up the project.

Steps to reproduce the behavior

1. Run docker-compose up using above docker-compose.yml

[ameier38]

Reverting to

Version 17.12.0-ce-win47 (15139)
Channel: stable
9c692cd

works without an error.

[ChristianSauer]

THis is critical for us, too!

[ChristianSauer]

@ameier38 Where can I find this older verison of docker?

[ameier38]

@ChristianSauer Go to install page and then download the stable channel.

[ThatRendle]

It would be really helpful for us Edge users if you could keep the previous Edge versions available for download so when something fundamental like this breaks we can just roll back one Edge release, instead of having to revert all the way back to Stable.

[creativearmenia]

You can download previous versions from this page https://docs.docker.com/docker-for-windows/release-notes/

[ThatRendle]

@creativearmenia So you can, I missed that. Thank you!

[wailua]

It's still an issue in 18.03.0-ce-rc4

[stalb]

The windows version of docker doesn't use unix socket (/var/run/docker.sock) but npipe (npipe:////./pipe/docker_engine).
So you have either

• to switch to linux container which runs docker in a full virtualized linux with unix socket
• to pass the npipe instead of the unix socket to the container (windows container only)
• to use a network socket (should work with linux and windows container)

The doc is here : https://docs.docker.com/docker-for-windows/faqs/#how-do-i-connect-to-the-remote-docker-engine-api

[ThatRendle]

@stalb This is not about connecting to the API, it's about mounting the /var/run/docker.sock unix socket (from the Hyper-V host Linux VM) into a running container.

[johnrom]

Looks like this issue is in stable now, and just wiped out an environment that uses an nginx proxy, listening to docker.sock to auto-proxy sites.

https://github.com/jwilder/nginx-proxy

Docker Version:
18.03.0-ce-win59

[jagraj]

We are getting into same issues on stable driver, when can we get fix for this.? Do we need to switch back to previous stable release.? Is there a workaround for this until we get fix in next stable driver.?

[johnrom]

@jagraj I reverted to the last version, 17.12.0-ce-win47, for now. I wasn't able to identify any workarounds or locate a docker.sock that was accessible from the host file system.