How docker enters a running container

With the widespread application of containerization technology, Docker has become a commonly used tool for many developers and operation and maintenance personnel. In Docker, you can run applications by running containers, and one of the most commonly used commands is docker run. But after running the container, how do you enter the running container and perform some operations? Next, this article will introduce you in detail how to enter a running Docker container.

1. View running containers

To enter a running Docker container, you need to check the status of the container and the container ID before entering the container. You can view the currently running containers through the following command:

docker ps

This command will display the running containers and their various details, such as container ID, container name, container image, container creation time, etc. .

2. Enter a running container

To enter an already running container, you need to use Docker's exec command. The syntax of the command is as follows:

docker exec -it <container_id> <command>

Where is the ID of the container, which can be obtained from the output of the docker ps command. In addition, is the command to be executed in the container.

For example, to enter a running container named my-container and execute the bash command, you can use the following command:

docker exec -it my-container bash

This command will start bash in the my-container container shell, allowing you to execute commands directly in the container.

3. Exit the container

After entering the container using Docker, you can execute any command in the container as if in a local terminal. When you finish operating the container, you can use the exit command to exit the container:

exit

After exiting the container, you will return to the local terminal interface.

4. Problems with modifying the container

It should be noted that if you persist the modifications you make in the container to the container or save it to the image, Please use the Docker commit command. This command saves all modifications made in the container before converting the container state to a new image.

docker commit [OPTIONS] CONTAINER [REPOSITORY[:TAG]]

Among them, OPTIONS is an optional parameter, CONTIANER is the ID or name of the container, REPOSITORY is the name of the image, and TAG is the tag name.

5. Summary

This article introduces how to enter a running Docker container. You can use the exec command to enter a running container and execute commands inside the container. This way, maintenance and management operations can be easily performed in the container without having to stop the container and start a new one first. When you are finished working on the container, don't forget to use the exit command to exit the container to return to the local terminal interface.

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