Why does "docker attach" hang?
I can run an
ubuntu container successfully:
# docker run -it -d ubuntu 3aef6e642327ce7d19c7381eb145f3ad10291f1f2393af16a6327ee78d7c60bb # docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 3aef6e642327 ubuntu "/bin/bash" 3 seconds ago Up 2 seconds condescending_sammet
docker attach hangs:
# docker attach 3aef6e642327
Until I press any key, such as
# docker attach 3aef6e642327 root@3aef6e642327:/# root@3aef6e642327:/# ls bin boot dev etc home lib lib64 media mnt opt proc root run sbin srv sys tmp usr var
docker attach hang?
After reading the comments, I think I get the answers:
"docker attach" reuse the same tty, not open new tty.
(1) Executing the
docker run without daemon mode:
# docker run -it ubuntu root@eb3c9d86d7a2:/#
Everything is OK, then run
root@eb3c9d86d7a2:/# ls bin boot dev etc home lib lib64 media mnt opt proc root run sbin srv sys tmp usr var root@eb3c9d86d7a2:/#
docker run in daemon mode:
# docker run -it -d ubuntu 91262536f7c9a3060641448120bda7af5ca812b0beb8f3c9fe72811a61db07fc
Actually, the following should have been outputted to stdout from the running container:
docker attach seems to hang, but actually it is waiting for your input:
# docker attach 91262536f7c9 ls bin boot dev etc home lib lib64 media mnt opt proc root run sbin srv sys tmp usr var root@91262536f7c9:/#
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I ran into this issue as well when attempting to attach to a container that was developed by someone else and already running a daemon. (In this case, it was LinuxServer's
transmission docker image).
What happened was the terminal appeared to 'hang', where typing anything didn't help and wouldn't show up. Only
Ctrl-C would kick me back out.
docker attach all was not successful, turns out the command I needed (after the container has been started with
start) was to execute
bash, as chances are the container you pulled from doesn't have bash already running.
docker exec -it <container-id> bash
(you can find the
container-id from running
docker ps -a).
This will pull you into the instance with a functional bash as
root (assuming there was no other explicit set up done by the image you pulled).
I know the accepted answer has captured this as well, but decided to post another one that is a little more terse and obvious, as the solution didn't pop out for me when I was reading it.
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This happened to me once for the following reason:
It could be that the bash command inside the container is executing a "cat" command.
So when you attach to the container (the bash command) you are actualy inside the cat command which is expecting input. (text and/or ctrl-d to write the file)
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When I run
docker attach container-name, then nothing output, even
Ctrl-c is invalid. So, first try
docker attach container-name --sig-proxy=false
ctrl-c can stop it. Why it didn't output anything?
just because the container doesn't output. Actually I need to enter my container and run some shell command. So the correct command is
docker exec -ti container-name bash
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If you cannot access command line, just make sure you run your container with
-i flag at start.
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