How do you usually use Docker?

How to use Docker

Docker is an open source virtualization technology that can package applications and services in a container for deployment and management in a lightweight manner. In the field of software development and operation and maintenance, Docker has been widely used because of its advantages of fast, reliable and reproducible deployment.

This article will introduce the usage methods and techniques of Docker in daily work, including container creation, image management and container deployment.

Container Creation

Docker container is a running instance of the Docker image. When using Docker, we need to first create a container and then deploy applications and services in this container. The following are the basic steps to create a container:

1. Download image

Before creating a container, we need to download a Docker image. Docker Hub is the image warehouse officially provided by Docker, which contains many public images. We can use the following command to download an image from Docker Hub:

docker pull <image-name></image-name>

where refers to the image name, such as ubuntu, nginx, etc. After executing this command, Docker will automatically download the image locally.

2. Create container

After downloading the image, we can use the following command to create a container:

docker run -it <image-name></image-name>

The -it parameter refers to interactive mode and terminal mode. After executing this command, Docker will create a new container and enter the terminal of the container.

3. Installing Applications in Containers

Installing applications in containers is the same as on a regular computer. We can install applications by executing commands in the container terminal, for example:

apt-get install <package-name></package-name>

where refers to the name of the software package that needs to be installed.

4. Exit the container

After installing the application, we can exit the container by using the exit command:

exit

The above are the basic steps to create a container . It is worth noting that the container is created based on the image, and every time the container exits, all changes will be discarded. Therefore, in actual use, we need to save the changes in the container as a Docker image for later use.

Mirror management

In Docker, we can use the following command to manage images:

1. View all local images

docker images

This command will list all local Docker images, including name, label, ID, size, creation time and other information.

2. Delete local mirror

If we no longer need a mirror, we can use the following command to delete it:

docker rmi <image-id></image-id>

where refers to the image ID that needs to be deleted.

3. Upload image to Docker Hub

If we want to share our own image, we can use the following command to upload it to Docker Hub:

docker push <image-name></image-name>

Where refers to the name of the image that needs to be uploaded.

The above are some basic commands for Docker image management. In addition, we can also use Dockerfile to customize the image building process to facilitate packaging applications and dependencies together.

Deployment of containers

When using Docker, we need to deploy the container to the server so that other users can access the services in it. The following are the basic steps for container deployment:

1. Configuring the Docker environment

Before deploying the container, we need to install Docker on the server. Installing Docker is the same as on a regular computer.

2. Download the image

Similar to when creating a container, we need to first download the image to be deployed from Docker Hub:

docker pull <image-name></image-name>

3. Run the container

After downloading the image, we can use the following command to run the container on the server:

docker run -d -p <host-port>:<container-port> <image-name></image-name></container-port></host-port>

The -d parameter refers to running the container in the background, and the -p parameter refers to It maps the host port to the container port , refers to the name of the image that needs to be run.

4. Access container services

After running the container, we can access the services in it through a browser or tool. If we map the container's port to a port on the host, other users can access the container service by accessing the host's IP address and port.

The above are the basic steps for container deployment. In addition, we can also use Docker Compose to manage the relationship between multiple containers to facilitate the construction of larger applications.

Summary

Docker is a fast, reliable and reproducible deployment technology that packages applications and services in a container for easy deployment and management. In daily development and operation and maintenance, we can use Docker to create containers, manage images and deploy services, thereby improving work efficiency and effectiveness.

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