How docker enters the interactive interface of running containers

Docker is an open source tool for virtualizing applications. It makes it possible to package applications as containers and run those containers anywhere. Not only that, Docker also provides an interactive interface for containers to facilitate user operations. This article will discuss how to enter the interactive interface of running containers.

1. Use the docker command to enter the container

We can use the docker command to enter the container. After entering the container, users can execute various commands in the container, such as viewing processes, modifying configurations, etc. The following are the specific steps:

1. Use the docker ps command to view the currently running container to obtain the container ID that needs to be entered.

$ docker ps

2. Use the docker exec command to enter the container based on the viewed container ID, where container_id is the container ID.

$ docker exec -it container_id /bin/bash

In the above operation, the -it option enables interactive entry into the container; /bin/bash specifies the default Shell after entering the container.

At this time, we enter the interactive interface of the container.

2. Use the docker attach command to enter the container

In addition to using the docker exec command to enter the container, we can also use the docker attach command to enter the container. Unlike docker exec, docker attach can only enter containers that are already running.

1. Use the docker ps command to view the currently running containers to obtain the container ID that needs to be entered.

$ docker ps

2. Use the docker attach command to enter the container based on the viewed container ID, where container_id is the container ID.

$ docker attach container_id

In the above operation, we used the docker attach command to enter the container. At this point, we enter the interactive interface of the container.

Execute the exit command in the container to exit the container interactive interface.

Summary

This article introduces two methods of entering the container interactive interface, using the docker exec command and the docker attach command. Both methods accomplish the task of entering the container. Using the docker exec command is more flexible, supports entering a stopped container, and can specify commands within the container. Using the docker attach command is simpler. You only need to specify the container ID to enter the container.

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