如何在 docker 容器内运行 tmux？

Question

I have some docker container running on a P2 instance. In the past I run tmux in the P2 instance a run a docker container inside. Afterwards I used

docker exec -it 

to get into the running docker container. I would like to avoid the above and be able to run tmux inside an existing container. hitting

tmux new -s <some name>

Doesn't do anything.

Answer 1

I assume that you want to connect to a docker container running remotely via tmux . In order to do this, you will have to run an ssh server within the container and attach to the tmux session using ssh . For example:

• Create the container image with ssh and tmux installed. The Dockerfile might look like this:

   FROM ubuntu:latest RUN apt-get update && \\ apt install -y tmux && \\ apt install -y openssh-server && \\ service ssh start && \\ tmux new -s mysesh EXPOSE 22/tcp

• Run the container, and port forward the ssh port:

   docker run -it -d -p 8654:22 <image name>

• Attach to the tmux session:

   ssh user@<hostname> -p 8654 -t "tmux a -t mysesh"

Note : tmux sessions are user specific, so ensure that the user exists in the container, and that the tmux session is started as the user within the container.

Answer 2

If tmux is already running in the container, it's as simple as docker attach container_name . ( Docs .)

Answer 3

tmux might not be available in docker image, you can install it once you're attached to the docker container.

sudo apt install tmux

Then you should be able to execute

tmux new -s <some name>

Tried this on a P3 machine worked fine. Reference: https://linuxize.com/post/getting-started-with-tmux/