How to use Docker to make containers run in the background

Docker is a very popular containerization technology tool that can help us build, deploy and manage applications quickly and efficiently. When using Docker, we usually need to run the container in the background so that we can better manage and monitor the running status of the container. This article will introduce how to use Docker to run containers in the background.

1. Use the command line to run the container in the background

Use the Docker command line to quickly and conveniently run the container in the background. We can use the following command:

docker run -d [image] [command]

Among them, the -d parameter indicates to let the container run in the background, the [image] parameter indicates the image that needs to be run, and the [command] parameter indicates the command that needs to be run in the container. For example, the following command will run a container named "web" and let it run in the background:

docker run -d nginx

In this example, we did not provide the [command] parameter because the Nginx image already contains a default startup command.

When the container is running in the background, we can use the following command to view the running status of the container:

docker ps

This command will return a list of currently running containers. If you want to view a list of all containers, including running containers and stopped containers, you can use the following command:

docker ps -a

2. Use Docker Compose to let multiple containers run in the background

Docker Compose is a very powerful container orchestration tool that allows us to easily manage and deploy multiple containers. If we need to have multiple containers running in the background, we can use Docker Compose.

We can create a file called "docker-compose.yml" to define the containers we need to run and their configuration. The following is a simple example:

version: '3'
services:
  web:
    image: nginx
    ports:
      - "80:80"
  db:
    image: mysql
    environment:
      - MYSQL_ROOT_PASSWORD=root

In this example, we define two services: web and db. The web service uses Nginx mirroring and maps port 80 of the host to port 80 of the container. The db service uses the MySQL mirror and sets an environment variable to specify the password of the root user.

To start these containers, use the following command:

docker-compose up -d

This command will start all the containers we defined in the docker-compose.yml file and let them run in the background.

We can use the following command to view the status of the container:

docker-compose ps

This command will return a list of currently running containers.

Summary

When using Docker, it is a very common requirement to let the container run in the background. Using the command line or Docker Compose, we can easily let the container run in the background and view the status of the container at any time. In actual development work, we can choose different methods to let the container run in the background according to our own needs.

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