yum install -y yum-utils device-mapper-persistent-data lvm2

yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo

[root@NMS yum.repos.d]# sudo yum install docker-ce docker-ce-cli
Last metadata expiration check: 0:03:53 ago on Fri 02 Jul 2021 08:18:32 PM CST.
Error:
Problem: problem with installed package buildah-1.19.7-1.module_el8.4.0+781+acf4c33b.x86_64
- package buildah-1.19.7-1.module_el8.4.0+781+acf4c33b.x86_64 requires runc >= 1.0.0-26, but none of the providers can be installed
- package buildah-1.19.7-2.module_el8.4.0+830+8027e1c4.x86_64 requires runc >= 1.0.0-26, but none of the providers can be installed

執行下方程式碼即可解決：

yum erase podman buildah

檢視Docker版本

[root@NMS src]# docker -v
Dodocker version 20.10.7, build f0df350
[rroot@NMS src]# ps -aux | grep docker
roroot       32830  0.0  0.0 179368   872 ?        Ss   20:25   0:00 gpg-agent --homedir /var/cache/PackageKit/8/metadata/docker-ce-stable-8-x86_64.tmp/gpgdir --use-standard-socket --daemon
roroot       35962  1.2  2.5 932280 95096 ?        Ssl  20:43   0:00 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock
roroot       36091  0.0  0.0  12136  1068 pts/0    S+   20:43   0:00 grep --color=auto docker

[root@NMS src]# docker run hello-world
r hello-world:latest

Hello from Docker!
This message shows that your installation appears to be working correctly.

To generate this message, Docker took the following steps:
1. The Docker client contacted the Docker daemon.
2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
(amd64)
3. The Docker daemon created a new container from that image which runs the
executable that produces the output you are currently reading.
4. The Docker daemon streamed that output to the Docker client, which sent it
to your terminal.

To try something more ambitious, you can run an Ubuntu container with:
$ docker run -it ubuntu bash

Share images, automate workflows, and more with a free Docker ID:
https://hub.docker.com/

For more examples and ideas, visit:
https://docs.docker.com/get-started/

[root@localhost xiajun]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
hello-world latest fce289e99eb9 15 months ago 1.84kB