Running dev container exec bash not responding

Question

I have following Dockerfile:

FROM elixir:1.4.5
COPY . /
RUN mix compile
CMD echo "Application started" &&  elixir --name $MY_POD_NAMESPACE@$MY_POD_IP --no-halt --cookie $ERLANG_COOKIE -S mix run

It starts and runs well, but when I try either attatch or exec XXX bash it does not respond at all.

Answer 1

Both the commands are different as such

docker attach containerid gets your to main process which was running and if it doesn't output anything further then you will not see anything. You should rather use docker logs containerid to see the output of your code

docker exec containerId bash means you want to get to a bash process inside the container. This command would execute and end immediately as you have not specified the interactive and the tty flags. Update it to use it as below

docker exec -it containerId bash

And you should be able to get a bash. If it still doesn't work then use docker stats containerId to see what kind of CPU and memory usage your container has

Answer 2

If docker exec -it container-id bash doesn't work then try docker exec -it container-id sh

Sometimes bash command doesn't work.