Let's talk about how to operate containers in Docker

Since its inception, container technology has quickly become an indispensable part of the enterprise IT technology stack. As the most popular containerization platform in the industry, Docker has become the standard in the DevOps field. If you don't know Docker yet, you're already behind the curve.

This article mainly introduces how to operate containers in Docker, including creating new containers, starting containers, entering containers, etc.

1. Create a new container

In Docker, the command to create a new container is docker run. Let's take the MySQL database container as an example to see how to create a new container.

First, we need to pull the MySQL image in Docker Hub:

docker pull mysql

After execution, we can create the MySQL container through the following command:

docker run --name=mysql-container -e MYSQL_ROOT_PASSWORD=123456 -d mysql:latest

where --name=mysql-container indicates that the container is named mysql-container, -e MYSQL_ROOT_PASSWORD=123456 indicates the root of MYSQL The user password is 123456, -d mysql:latest means creating a background running container based on the latest version of MYSQL. After execution, we have successfully created a MySQL database container.

2. Start the container

The command to start the container in Docker is docker start. Let's take the MySQL container created in the previous step as an example to see how to start a container.

docker start mysql-container

After execution, we have successfully started the MySQL container.

3. Enter the container

After the container is running, you need to enter the container to operate. There are two common operation methods: enter the container through the docker exec command , or enter the container through the docker attach command. Both methods have their own advantages and disadvantages, and the specific use depends on the actual situation. Here we take docker exec as an example to illustrate.

docker exec -it mysql-container bash

After the execution is completed, we have successfully entered the command line interface of the MySQL container and can perform various operations, such as executing SQL statements, etc.

4. Exit the container

The command to exit the container in Docker is exit. After exiting the container, we can view the currently running container through the docker ps command.

exit
docker ps

After execution, we have exited the MySQL container and can view the list of currently running containers.

Summary

This article mainly introduces how to operate containers in Docker, including creating new containers, starting containers, entering containers, etc. By studying this article, I hope readers can have a better understanding of the operation of Docker containers and learn how to use Docker for development, testing, and deployment.

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