Docker installation detailed steps

Docker’s three core concepts: image, container, and warehouse

Image: an image similar to a virtual machine, which is an installation file in common parlance.

Container: Similar to a lightweight sandbox, the container creates an application running instance from the image.

It can be started, started, stopped, and deleted, and these containers are isolated from each other. , mutually invisible.

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

(Recommended tutorial: docker tutorial)

A brief introduction to installing Docker on CentOS.

Prerequisites:

64-bit system

kernel 3.10

1. Check the kernel version, and the returned value is greater than 3.10.

  $ uname -r

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

3. Make sure yum is the latest

  $ yum update

4. Add yum repository

tee /etc/yum.repos.d/docker.repo <<-&#39;EOF&#39;
[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

6. Start docker

  $systemctl start docker.service

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

Use the docker version command to view

8. Set up auto-start on boot

 $ sudo systemctl enable docker

Installation completed!

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