Let’s talk about the installation and deployment steps of Docker

Docker is a lightweight container technology that can package an application and its dependent components into a portable container, making the application easier to deploy and port. With the continuous development of Docker technology, more and more organizations and enterprises are beginning to use Docker to accelerate the application development and deployment process. This article will introduce the installation and deployment steps of Docker.

1. Install Docker

The installation steps of Docker are slightly different on different operating systems. This article will introduce the steps to install Docker on a Linux system.

1. Check whether the system’s kernel version supports Docker.

$ uname -r

2. Upgrade the software package index and software packages.

$ sudo apt-get update
$ sudo apt-get upgrade

3. Install Docker CE from the Docker repository.

$ sudo apt-get install docker-ce docker-ce-cli containerd.io

4. Start Docker

$ sudo systemctl start docker

5. Check whether Docker is installed correctly

$ sudo docker run hello-world

2. Use Docker

The core concept of Docker is the container, and the container is an application that runs independently program. The following steps will introduce how to use Docker to create, start, stop and delete containers.

1. Search for an image on Docker Hub

Docker Hub is a public image warehouse with tens of thousands of images for users to use. We can use existing images on Docker Hub or build our own images according to our needs. The following is an example:

$ sudo docker search nginx

2. Download an image from Docker Hub to local

$ sudo docker pull nginx

3. Create a container using the downloaded image

$ sudo docker run -d -p 8080:80 nginx

4. View the running container

$ sudo docker ps

5. Stop a running container

$ sudo docker stop [container-id]

6. Delete a container

$ sudo docker rm [container-id]

3. Create a custom Docker image

In addition to using the existing image on Docker Hub, we can also create a custom image to meet specific needs.

The following are the steps to customize the image:

1. Write a Dockerfile

Dockerfile is a file that contains the instructions required to build a Docker image. Here is an example:

FROM ubuntu:latest
MAINTAINER John Doe
RUN apt-get update && apt-get install -y nginx
ENTRYPOINT ["/usr/sbin/nginx", "-g", "daemon off;"]

2. Build Docker image

Run the following command to build Docker image:

$ sudo docker build -t my-nginx .

3. Use the created image to start a container

$ sudo docker run -d -p 8080:80 my-nginx

Summary

Docker is a powerful container technology that can accelerate the application development and deployment process. This article explains how to install and use Docker on a Linux system, as well as the steps to create a custom Docker image. If you are already familiar with the basic concepts and operation steps of Docker, you can start to explore more in-depth Docker development and deployment technologies.

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