Install Docker on Linux (very simple installation method)

I have been quite free recently. I have been doing internship for a few months as a senior in college. As an intern, I was asked to study Docker. Shame!

The three core concepts of Docker: images, containers, and warehouses

Image: Similar to the image of a virtual machine, in layman's terms, it is an installation file.

Container: Similar to a lightweight sandbox, a container is an application running instance created from an image. It can be started, started, stopped, and deleted, and these containers are isolated and invisible to each other.

Warehouse: Similar to a code warehouse, it is a place where Docker stores image files.

Let’s briefly introduce how to install Docker on CentOS.

Prerequisites:

• 64-bit systems
• kernel 3.10+

1. Check the kernel version. The returned value should be greater than 3.10.

$ uname -r 

2. Log in to the terminal using sudo or a user with root privileges.

3. Make sure yum is up to date

$ yum update

4. Add yum repository

tee /etc/yum.repos.d/docker.repo <<-'EOF'
[dockerrepo]
name=Docker Repository
baseurl=https://yum.dockerproject.org/repo/main/centos/$releasever/
enabled=1
gpgcheck=1
gpgkey=https://yum.dockerproject.org/gpg
EOF 

5. Install Docker

$ yum install -y docker-engine

After successful installation, use the docker version command to check whether the installation is successful. After successful installation------as shown below

6. Start Docker

$ systemctl start docker.service

7. Verify whether the installation is successful (the presence of client and service parts indicates that the docker installation and startup are successful)

Use the docker version command to view

8. Set the startup to start automatically

$ sudo systemctl enable docker

So far, Docker is fully installed.

If there are any shortcomings, fellow Taoists are welcome to point them out.

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