附加到 docker 容器内的特定运行进程

Question

While the nginx might not be a good example for this case but there would be similar cases that we will need to run a process and access it inside a container without recreating/rerunning it.

I already run nginx as a container using following command:

docker run -d --name=my_container nginx:latest

I didn't active terminal or interactive mode during docker run command. Now, I want to run a bash (using docker exec... ) in detach mode and then attach (using docker attach... ) to it later.

As you know we can run new process inside a container, eg:

docker exec -itd my_container bash

By this way a new bash process will run inside this container.

Now my question is that how to attach to this process later?

I tried to run following command but it just shows the nginx live log:

docker attach my_nginx2

Answer 1

If I understand your use case, you can do this:

docker run -itd --name=my_container nginx:latest bash -i -c 'nginx; bash -i'

this allows you to do:

docker attach my_container

you can detach from a container and leave it running using the CTRL-p CTRL-q key sequence.