Install docker for CentOS

Environment: Linux centos8 4.18.0-80.el8.x86_ 64、docker-19.03.5

1. Preconditions

Requires OS kernel 3.10+
Uname - R // view the operating system version number

2. Check if it is installed (uninstalled)

yum remove docker \
    docker-client \
    docker-client-latest \
    docker-common \
    docker-latest \
    docker-latest-logrotate \
    docker-logrotate \
    docker-engine

You can also uninstall in the following ways:
*Yum list installed | grep docker // find installed dockers
* yum remove docker-ce.x86_ 64 docker-ce-cli.x86_ 64 - Y // uninstall and install
*RM - RF / var / lib / docker // delete directory file

3. Set up warehouse

To install the required software package, yum utils provides Yum config manager, and the device mapper storage driver requires device mapper persistent data and lvm2
* yum install -y yum-utils \
        device-mapper-persistent-data
        lvm2

Set up a stable warehouse
yum-config-manager \
           --add-repo \
           https://download.docker.com/linux/centos/docker-ce.repo

4. Install docker engine community

yum install docker-ce docker-ce-cli  containerd.io  //The latest version is installed by default

Installation error, because Yum is installed containerd.io Too low, need to download and install higher version containerd.io >=1.2.2-3
Solution:
dnf install  https://download.docker.com/linux/centos/7/x86_ 64/stable/Packages/ containerd.io -1.2.6-3.3.el7.x86_ 64. RPM // DNF is a better RPM tool

Then continue to install docker Ce (background service) and docker CE cli (client)
yum install docker-ce docker-ce-cli

5. Start docker service

* systemctl start docker
* systemctl enable docker
* systemctl status docker

6. Check whether the installation is successful

docker version

7. Docker other command test

* docker iamges
* docker ps
*Docker search image

8. Postscript

You can choose to install different versions of docker CE and docker CE cli
*Yum list docker CE -- showduplicates | sort - R // list of different versions
*Yum list docker CE cli -- showduplicates | sort - R // list of different versions

Installation:
yum install docker-ce-<VERSION_STRING> docker-ce-cli-<VERSION_STRING>

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