CODEWITHSUNDEEP
docker
dmx
dmx

Reputation: 1990

Why "docker attach" not working and blocking my konsole on ubuntu

basically, I have a running container I would like to attach console on it. I have used docker run -p 8080:80 test to start my container. It seems to be working fine.

my docker ps looks like this :

CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                            NAMES
81b27e2525f1        test            "/bin/sh -c /start.sh"   13 minutes ago      Up 13 minutes       8080/tcp, 0.0.0.0:8080->80/tcp   vigilant_bassi

Then tried to attach my a console

user@user:~$ docker attach 81b27e2525f1 
    ls  
    ^C
    
    
    
    ls
    ^[[A^[[A^[[A^[[A^[[A^[[A^[[A^[[A^[[A^[[A^[[A^[[A^[[A^[[A^[[B^[[B^[[B^[[A^[[A^[[A^[[A^[[A^[[A^[[A^[[A^[[A^[[A^C^C^C^C^[[A^[[A^[[A^[[A^[[A

This is not working and I am unable to detach.
Then I thought it was a bug I tried to open on new and I had the exact same issue. Now I have multiple consoles blocked. I found this question, it is not the same problem.

What am I doing wrong?

ps my docker version is : Docker version 1.13.1, build 092cba3

Upvotes: 5

Views: 4869

Answers (2)

Robert
Robert

Reputation: 36823

You can see the output of your container without attaching to it:

docker logs -f <container-id>

But if you really need to attach to it you have to start it with the -it flags:

docker run --detach -it -p 8080:80 test

To attach:

docker attach <container-id>

Don't use Ctrl+C to detach because that will be a signal that will quit program. Use Ctrl+P then Ctrl+Q to detach.

Upvotes: 1

VonC
VonC

Reputation: 1327384

Try instead a docker exec, for debugging purpose:

docker exec -it test bash

(assuming your test image has a bash installed, or at least an sh. If based on Alpine, an ash)

docker attach uses the container’s stdio/stderr, so you need to makle sure your script is actually flushing/printing something.

Upvotes: 5

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