Terminal exited. Connection gets closed immediately.

[jeroenpeeters]

Terminal exited. Connection gets closed immediately.

[jeroenpeeters]

Hi, I tried the steps mentioned in your issue report, but when I execute these steps I can actually ssh into the container. I see in the output of the webinterface you posted that you are trying to ssh into a container named 'php-debug-test2' while the container in your example is called 'sshd-less '.

Are you sure that container 'php-debug-test2' has bash? This is problem can actually manifest if bash is not present, or not present on the PATH.

By default Docker-SSH tries to start a shell with the bash command. If your container has bash on a different path, or uses a different shell (for example sh) you can configure Docker-SSH to use that shell by specifying the CONTAINER_SHELL environment variable like so:

docker run -e CONTAINER_SHELL=/bin/sh -e CONTAINER=sshd-less -e AUTH_MECHANISM=noAuth \ --name sshd-php-debug-test -p 2222:22 -p 8022:8022 --rm \ -v /var/run/docker.sock:/var/run/docker.sock -v $(which docker):/usr/bin/docker \ jeroenpeeters/docker-ssh

First try the following to check if the container has bash or sh.

docker exec -ti sshd-less which bash or docker exec -ti sshd-less which sh

Let me know how it goes.

[asperling]

Hey, thanks for the lightning fast reply!

And yes, there were typos. I wanted to clean up my naming mess with things like "test2" and such but it didn't work out, did it? :)

Yes, the container has bash, verified by:

> docker exec -ti php-debug-test2 which bash
/bin/bash

But still no luck. It the same as described above. I also made sure only those two containers were running.

[asperling]

As of the moment I can only think of one and that's a problem with mounting the docker socket and binary and some/one missing dependencies on the guest.

After exec'ing into the docker-ssh container and trying to exec into my ssh-less conatainer I get the following error:

root@bd6d89f564a2:/lib/x86_64-linux-gnu# docker exec -ti nostalgic_meitner sh               
docker: /lib/x86_64-linux-gnu/libdevmapper.so.1.02.1: version `DM_1_02_97' not found (required by docker)

(nostalgic_meitner in that case is a running alpine conatiner)

The same error occurs by just calling docker from inside the running docker-ssh container.

Now, my docker env is as dfollows:

> docker version
Client:
 Version:      1.9.1
 API version:  1.21
 Go version:   go1.4.2
 Git commit:   a34a1d5
 Built:        Fri Nov 20 13:20:08 UTC 2015
 OS/Arch:      linux/amd64

Server:
 Version:      1.9.1
 API version:  1.21
 Go version:   go1.4.2
 Git commit:   a34a1d5
 Built:        Fri Nov 20 13:20:08 UTC 2015
 OS/Arch:      linux/amd64

[asperling]

Well, I fixed it or more precisely found a workaround by mounting the library into the docker-ssh container alongside the docker socket and binary which results in the following run statement:

docker run \
  -e CONTAINER_SHELL=sh \
  -e CONTAINER=nostalgic_meitner \
  -e AUTH_MECHANISM=noAuth \
  --name sshd-docker \
  -p 2222:22 \
  -p 8022:8022 \
  --rm \
  -v /var/run/docker.sock:/var/run/docker.sock \
  -v $(which docker):/usr/bin/docker \
  -v /lib/x86_64-linux-gnu/libdevmapper.so.1.02.1:/lib/x86_64-linux-gnu/libdevmapper.so.1.02.1 \
  jeroenpeeters/docker-ssh

Now it works like a charm and I will close this issue!

As an improvement I would suggest using a docker-in-docker container instead of mounting the executable and socket (and now the device mapper lib). Maybe I will give it a try.

[jeroenpeeters]

Could you please pull the latest version and try it without mapping libdevmapper. I changed the image to be based on Alpine with all the Docker binaries/libraries included. The image itself is also much smaller. For me it is now enough to only map the docker socket into the container.

Please give it a try and let me know how it went.

[jeroenpeeters]

My request is still current, however I have completely removed all Docker binaries from the image. I changed the implementation to directly connect to the Docker engine using the API over the Docker socket. There is no need to map any binaries anymore except for the Docker socket.

[asperling]

Hey, I'm back from some vacation days... I'll give it a try asap. BTW I also tried to build an image based on alpine, added glibc and stuff but it wouldn't work. So I'm curious!

[jeroenpeeters]

Did you manage to try it again?