Read this tutorial which will help you to understand how to get bash or ssh into a running container in background mode. This tutorial is written by well known experienced DevOps trainer - Rajesh and published on scmGalaxy.
Step 1: First of all, try to find your active container by running
# docker ps
or
# docker ps -a
Step 2: If the container is not running,
# docker start your_id
Step 3: If we use attach we can use only one instance of shell.
# sudo docker attach 665b4a1e17b6 #by ID Read complete tutorial click here
Reference:- This tutorial was originally posted on scmGalaxy.com

This is a very helpful guide for anyone working with Docker and wanting to access a running container. Using docker exec -it /bin/bash (or /bin/sh) is the simplest and safest way to interact with the container for debugging or inspecting files without installing an SSH server. This approach makes it easy to troubleshoot, explore the container environment, and run commands directly, which is essential for effective DevOps and container management workflows. Great explanation!
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