What is the purpose of using docker attach?

The docker attach command is used to connect to the standard input, output, and error output (stdin, stdout, and stderr) of a running container. It allows users to interact with the running container, similar to connecting to a remote server using SSH.

With the “docker attach” command, users can view and interact with the output of processes running within a container. For example, they can use this command to view logs of applications running within the container or to run interactive command line tools within the container.

It is important to note that the docker attach command will directly connect to the main process of the container, sharing its standard input, output, and error output. Therefore, if the main process of the container exits or is terminated, the connection will also be closed. If you need to run a long-running task or background process in the container and want to interact with it, consider using the docker exec command to create a new process and interact with it, instead of using docker attach.