Create a testcontainer on a remote daemon using SSH, is this supported?

[preetmyob]

*I'm on a mac m1, but this is more of a general question. I use colima to run containers on arm and x86 platforms, I also connect to other docker daemons *

I can run testcontainers with the Colima docker.sock using the symlinks from /var/run/docker.sock

/var/run/docker.sock -> /Users/Preet.Sangha/.docker/run/docker.sock
/Users/Preet.Sangha/.docker/run/docker.sock -> /Users/Preet.Sangha/.colima/edit/docker.sock

When using the docker cli, I can connect to docker daemon running on another (virtual) machine by setting up an appropriate docker context using ssh.

❯ docker context ls --format table                                                                                                                               
NAME               DESCRIPTION                               DOCKER ENDPOINT                                       ERROR
colima-edit *      colima [profile=edit]                     unix:///Users/<user_id>/.colima/edit/docker.sock
default            Current DOCKER_HOST based configuration   unix:///var/run/docker.sock
parallels-debian   parllels-debian                           ssh://[email protected]

I've not found a way to connect testcontainers to the remote daemon. Is there a defined way I should set it up, please?

[HofmeisterAn]

To use Colima usually you need to set the DOCKER_HOST environment variable to Colima's daemon socket. I do not recommend to change the symlink. Please note, Testcontainers requires a Docker API compatible runtime. There might be features Colima does not support.

Regarding SSH. Docker.DotNet does not support SSH endpoints (dotnet/Docker.DotNet#575). Therefore Testcontainers cannot support it.

[preetmyob]

Thank you @HofmeisterAn . I've read through that chain of PRs and can see it's predicated on SSH.NET changes. I look forward to Docker.DotNet/pull/575 going into master.

[preetmyob]

Do you have any recommended ways of connecting to remote docker daemons instead of SSH at this point? I'll try TCP port forwarding to see how I get on in the mean time

[HofmeisterAn]

You can connect to a TCP endpoint, simply set the DOCKER_HOST environment variable:

DOCKER_HOST=tcp://127.0.0.1:2375 dotnet test $PROJECT

[preetmyob]

Thank you this works great