1、安裝准備
如果有安裝過docker，先卸載舊版本，命令如下：
sudo yum remove docker \
docker-client \
docker-client-latest \
docker-common \
docker-latest \
docker-latest-logrotate \
docker-logrotate \
docker-engine
2、安裝
這里使用Docker倉庫的方式安裝
2.1、設置倉庫
安裝yum-utils包（提供yum-config-manager）並設置docker倉庫，並且 device mapper 存儲驅動程序需要 device-mapper-persistent-data 和 lvm2
使用官方倉庫地址（比較慢）
sudo yum install -y yum-utils \
device-mapper-persistent-data \
lvm2
sudo yum-config-manager \
--add-repo \
https://download.docker.com/linux/centos/docker-ce.repo
可以選擇國內的一些倉庫地址
阿里雲
sudo yum-config-manager \
--add-repo \
http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
清華大學
sudo yum-config-manager \
--add-repo \
https://mirrors.tuna.tsinghua.edu.cn/docker-ce/linux/centos/docker-ce.repo
2.2 安裝Docker Engine
安裝最新版本的Docker Engine和 containerd
sudo yum install docker-ce docker-ce-cli containerd.io
如果出現以下錯誤：
Error:
Problem 1: problem with installed package podman-1.4.2-5.module_el8.1.0+237+63e26edc.x86_64
- package podman-1.4.2-5.module_el8.1.0+237+63e26edc.x86_64 requires runc, but none of the providers can be installed
- package podman-3.0.1-6.module_el8.4.0+781+acf4c33b.x86_64 requires runc >= 1.0.0-57, but none of the providers can be installed
- package podman-3.0.1-7.module_el8.4.0+830+8027e1c4.x86_64 requires runc >= 1.0.0-57, but none of the providers can be installed
- package containerd.io-1.4.8-3.1.el8.x86_64 conflicts with runc provided by runc-1.0.0-60.rc8.module_el8.1.0+237+63e26edc.x86_64
- package containerd.io-1.4.8-3.1.el8.x86_64 obsoletes runc provided by runc-1.0.0-60.rc8.module_el8.1.0+237+63e26edc.x86_64
- package containerd.io-1.4.8-3.1.el8.x86_64 conflicts with runc provided by runc-1.0.0-70.rc92.module_el8.4.0+673+eabfc99d.x86_64
- package containerd.io-1.4.8-3.1.el8.x86_64 obsoletes runc provided by runc-1.0.0-70.rc92.module_el8.4.0+673+eabfc99d.x86_64
- package containerd.io-1.4.8-3.1.el8.x86_64 conflicts with runc provided by runc-1.0.0-73.rc93.module_el8.4.0+830+8027e1c4.x86_64
- package containerd.io-1.4.8-3.1.el8.x86_64 obsoletes runc provided by runc-1.0.0-73.rc93.module_el8.4.0+830+8027e1c4.x86_64
- cannot install the best candidate for the job
- package runc-1.0.0-56.rc5.dev.git2abd837.module_el8.3.0+569+1bada2e4.x86_64 is filtered out by modular filtering
- package runc-1.0.0-64.rc10.module_el8.4.0+522+66908d0c.x86_64 is filtered out by modular filtering
- package runc-1.0.0-65.rc10.module_el8.4.0+819+4afbd1d6.x86_64 is filtered out by modular filtering
- package runc-1.0.0-70.rc92.module_el8.4.0+786+4668b267.x86_64 is filtered out by modular filtering
- package runc-1.0.0-71.rc92.module_el8.4.0+833+9763146c.x86_64 is filtered out by modular filtering
Problem 2: problem with installed package cockpit-podman-4-1.module_el8.1.0+237+63e26edc.noarch
- package cockpit-podman-4-1.module_el8.1.0+237+63e26edc.noarch requires podman >= 1.2.0, but none of the providers can be installed
- package cockpit-podman-29-2.module_el8.4.0+781+acf4c33b.noarch requires podman >= 1.3.0, but none of the providers can be installed
- package podman-3.0.1-6.module_el8.4.0+781+acf4c33b.x86_64 requires runc >= 1.0.0-57, but none of the providers can be installed
- package containerd.io-1.4.3-3.1.el8.x86_64 conflicts with runc provided by runc-1.0.0-70.rc92.module_el8.4.0+673+eabfc99d.x86_64
- package containerd.io-1.4.3-3.1.el8.x86_64 obsoletes runc provided by runc-1.0.0-70.rc92.module_el8.4.0+673+eabfc99d.x86_64
- package containerd.io-1.4.3-3.1.el8.x86_64 conflicts with runc provided by runc-1.0.0-73.rc93.module_el8.4.0+830+8027e1c4.x86_64
- package containerd.io-1.4.3-3.1.el8.x86_64 obsoletes runc provided by runc-1.0.0-73.rc93.module_el8.4.0+830+8027e1c4.x86_64
- package docker-ce-3:20.10.7-3.el8.x86_64 requires containerd.io >= 1.4.1, but none of the providers can be installed
- package containerd.io-1.4.3-3.2.el8.x86_64 conflicts with runc provided by runc-1.0.0-70.rc92.module_el8.4.0+673+eabfc99d.x86_64
- package containerd.io-1.4.3-3.2.el8.x86_64 obsoletes runc provided by runc-1.0.0-70.rc92.module_el8.4.0+673+eabfc99d.x86_64
- package containerd.io-1.4.3-3.2.el8.x86_64 conflicts with runc provided by runc-1.0.0-73.rc93.module_el8.4.0+830+8027e1c4.x86_64
- package containerd.io-1.4.3-3.2.el8.x86_64 obsoletes runc provided by runc-1.0.0-73.rc93.module_el8.4.0+830+8027e1c4.x86_64
- package containerd.io-1.4.3-3.1.el8.x86_64 conflicts with runc provided by runc-1.0.0-60.rc8.module_el8.1.0+237+63e26edc.x86_64
- package containerd.io-1.4.3-3.1.el8.x86_64 obsoletes runc provided by runc-1.0.0-60.rc8.module_el8.1.0+237+63e26edc.x86_64
- package containerd.io-1.4.3-3.2.el8.x86_64 conflicts with runc provided by runc-1.0.0-60.rc8.module_el8.1.0+237+63e26edc.x86_64
- package containerd.io-1.4.3-3.2.el8.x86_64 obsoletes runc provided by runc-1.0.0-60.rc8.module_el8.1.0+237+63e26edc.x86_64
- package containerd.io-1.4.4-3.1.el8.x86_64 conflicts with runc provided by runc-1.0.0-60.rc8.module_el8.1.0+237+63e26edc.x86_64
- package containerd.io-1.4.4-3.1.el8.x86_64 obsoletes runc provided by runc-1.0.0-60.rc8.module_el8.1.0+237+63e26edc.x86_64
- package containerd.io-1.4.6-3.1.el8.x86_64 conflicts with runc provided by runc-1.0.0-60.rc8.module_el8.1.0+237+63e26edc.x86_64
- package containerd.io-1.4.6-3.1.el8.x86_64 obsoletes runc provided by runc-1.0.0-60.rc8.module_el8.1.0+237+63e26edc.x86_64
- package containerd.io-1.4.8-3.1.el8.x86_64 conflicts with runc provided by runc-1.0.0-60.rc8.module_el8.1.0+237+63e26edc.x86_64
- package containerd.io-1.4.8-3.1.el8.x86_64 obsoletes runc provided by runc-1.0.0-60.rc8.module_el8.1.0+237+63e26edc.x86_64
- cannot install the best candidate for the job
- package runc-1.0.0-64.rc10.module_el8.4.0+522+66908d0c.x86_64 is filtered out by modular filtering
- package runc-1.0.0-65.rc10.module_el8.4.0+819+4afbd1d6.x86_64 is filtered out by modular filtering
- package runc-1.0.0-70.rc92.module_el8.4.0+786+4668b267.x86_64 is filtered out by modular filtering
- package runc-1.0.0-71.rc92.module_el8.4.0+833+9763146c.x86_64 is filtered out by modular filtering
- package containerd.io-1.4.4-3.1.el8.x86_64 conflicts with runc provided by runc-1.0.0-70.rc92.module_el8.4.0+673+eabfc99d.x86_64
- package containerd.io-1.4.4-3.1.el8.x86_64 obsoletes runc provided by runc-1.0.0-70.rc92.module_el8.4.0+673+eabfc99d.x86_64
- package containerd.io-1.4.4-3.1.el8.x86_64 conflicts with runc provided by runc-1.0.0-73.rc93.module_el8.4.0+830+8027e1c4.x86_64
- package containerd.io-1.4.4-3.1.el8.x86_64 obsoletes runc provided by runc-1.0.0-73.rc93.module_el8.4.0+830+8027e1c4.x86_64
- package containerd.io-1.4.6-3.1.el8.x86_64 conflicts with runc provided by runc-1.0.0-70.rc92.module_el8.4.0+673+eabfc99d.x86_64
- package containerd.io-1.4.6-3.1.el8.x86_64 obsoletes runc provided by runc-1.0.0-70.rc92.module_el8.4.0+673+eabfc99d.x86_64
- package containerd.io-1.4.6-3.1.el8.x86_64 conflicts with runc provided by runc-1.0.0-73.rc93.module_el8.4.0+830+8027e1c4.x86_64
- package containerd.io-1.4.6-3.1.el8.x86_64 obsoletes runc provided by runc-1.0.0-73.rc93.module_el8.4.0+830+8027e1c4.x86_64
- package containerd.io-1.4.8-3.1.el8.x86_64 conflicts with runc provided by runc-1.0.0-70.rc92.module_el8.4.0+673+eabfc99d.x86_64
- package containerd.io-1.4.8-3.1.el8.x86_64 obsoletes runc provided by runc-1.0.0-70.rc92.module_el8.4.0+673+eabfc99d.x86_64
- package containerd.io-1.4.8-3.1.el8.x86_64 conflicts with runc provided by runc-1.0.0-73.rc93.module_el8.4.0+830+8027e1c4.x86_64
- package containerd.io-1.4.8-3.1.el8.x86_64 obsoletes runc provided by runc-1.0.0-73.rc93.module_el8.4.0+830+8027e1c4.x86_64
- package podman-3.0.1-7.module_el8.4.0+830+8027e1c4.x86_64 requires runc >= 1.0.0-57, but none of the providers can be installed
- package podman-1.4.2-5.module_el8.1.0+237+63e26edc.x86_64 requires runc, but none of the providers can be installed
- package runc-1.0.0-56.rc5.dev.git2abd837.module_el8.3.0+569+1bada2e4.x86_64 is filtered out by modular filtering
- package podman-1.6.4-26.module_el8.4.0+793+f0dfa22d.x86_64 is filtered out by modular filtering
- package podman-3.0.1-6.module_el8.4.0+786+4668b267.x86_64 is filtered out by modular filtering
查看是否安裝了Podman
rpm -q podman
結果：
--podman-1.4.2-5.module_el8.1.0+237+63e26edc.x86_64
已經安裝了podman，刪除Podman
dnf remove podman
再執行安裝命令，發現還報如下錯誤：
Error:
Problem: problem with installed package buildah-1.9.0-5.module_el8.1.0+237+63e26edc.x86_64
- package buildah-1.9.0-5.module_el8.1.0+237+63e26edc.x86_64 requires runc >= 1.0.0-26, but none of the providers can be installed
- 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
- package containerd.io-1.4.8-3.1.el8.x86_64 conflicts with runc provided by runc-1.0.0-60.rc8.module_el8.1.0+237+63e26edc.x86_64
- package containerd.io-1.4.8-3.1.el8.x86_64 obsoletes runc provided by runc-1.0.0-60.rc8.module_el8.1.0+237+63e26edc.x86_64
- package containerd.io-1.4.8-3.1.el8.x86_64 conflicts with runc provided by runc-1.0.0-70.rc92.module_el8.4.0+673+eabfc99d.x86_64
- package containerd.io-1.4.8-3.1.el8.x86_64 obsoletes runc provided by runc-1.0.0-70.rc92.module_el8.4.0+673+eabfc99d.x86_64
- package containerd.io-1.4.8-3.1.el8.x86_64 conflicts with runc provided by runc-1.0.0-73.rc93.module_el8.4.0+830+8027e1c4.x86_64
- package containerd.io-1.4.8-3.1.el8.x86_64 obsoletes runc provided by runc-1.0.0-73.rc93.module_el8.4.0+830+8027e1c4.x86_64
- cannot install the best candidate for the job
- package runc-1.0.0-56.rc5.dev.git2abd837.module_el8.3.0+569+1bada2e4.x86_64 is filtered out by modular filtering
- package runc-1.0.0-64.rc10.module_el8.4.0+522+66908d0c.x86_64 is filtered out by modular filtering
- package runc-1.0.0-65.rc10.module_el8.4.0+819+4afbd1d6.x86_64 is filtered out by modular filtering
- package runc-1.0.0-70.rc92.module_el8.4.0+786+4668b267.x86_64 is filtered out by modular filtering
- package runc-1.0.0-71.rc92.module_el8.4.0+833+9763146c.x86_64 is filtered out by modular filtering
同樣使用上面檢查podman的方式處理，然后再執行安裝命令，就可以了，然后跟着提示操作就行。
安裝成功最后會提示如下：
Installed:
container-selinux-2:2.162.0-1.module_el8.4.0+830+8027e1c4.noarch containerd.io-1.4.8-3.1.el8.x86_64 docker-ce-3:20.10.7-3.el8.x86_64 docker-ce-cli-1:20.10.7-3.el8.x86_64
docker-ce-rootless-extras-20.10.7-3.el8.x86_64 docker-scan-plugin-0.8.0-3.el8.x86_64 fuse-common-3.2.1-12.el8.x86_64 fuse-overlayfs-1.4.0-3.module_el8.4.0+830+8027e1c4.x86_64
fuse3-3.2.1-12.el8.x86_64 fuse3-libs-3.2.1-12.el8.x86_64 libcgroup-0.41-19.el8.x86_64 libslirp-4.3.1-1.module_el8.4.0+575+63b40ad7.x86_64
slirp4netns-1.1.8-1.module_el8.4.0+641+6116a774.x86_64
2.3、查看Docker其他版本
如果不想安裝最新的版本，可以使用如下命令，查看其他版本。
yum list docker-ce --showduplicates | sort -r
Installed Packages
docker-ce.x86_64 3:20.10.7-3.el8 docker-ce-stable
docker-ce.x86_64 3:20.10.7-3.el8 @docker-ce-stable
docker-ce.x86_64 3:20.10.6-3.el8 docker-ce-stable
docker-ce.x86_64 3:20.10.5-3.el8 docker-ce-stable
docker-ce.x86_64 3:20.10.4-3.el8 docker-ce-stable
docker-ce.x86_64 3:20.10.3-3.el8 docker-ce-stable
docker-ce.x86_64 3:20.10.2-3.el8 docker-ce-stable
docker-ce.x86_64 3:20.10.1-3.el8 docker-ce-stable
docker-ce.x86_64 3:20.10.0-3.el8 docker-ce-stable
docker-ce.x86_64 3:19.03.15-3.el8 docker-ce-stable
docker-ce.x86_64 3:19.03.14-3.el8 docker-ce-stable
docker-ce.x86_64 3:19.03.13-3.el8 docker-ce-stable
通過其完整的軟件包名稱安裝特定版本，該軟件包名稱是軟件包名稱（docker-ce）加上版本字符串（第二列），從第一個冒號（:）一直到第一個連字符，並用連字符（-）分隔。例如：docker-ce-19.03.13。
sudo yum install docker-ce-<VERSION_STRING> docker-ce-cli-<VERSION_STRING> containerd.io
例如：
sudo yum install docker-ce-19.03.13 docker-ce-cli-19.03.13 containerd.io
2.4、啟動Docker
sudo systemctl start docker
2.5、測試Docker安裝情況
通過運行hello-world鏡像驗證Docker Engine是否安裝成功
sudo docker run hello-world
看到如下信息，則代表Docker已經安裝成功。
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
b8dfde127a29: Pull complete
Digest: sha256:df5f5184104426b65967e016ff2ac0bfcd44ad7899ca3bbcf8e44e4461491a9e
Status: Downloaded newer image for 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/
從以上信息可以看出，Docker先在本地查看是否有hello-world鏡像，如果沒有就到遠程倉庫獲取，可以運行如下命令，查看鏡像。
docker images
結果：
REPOSITORY TAG IMAGE ID CREATED SIZE
hello-world latest d1165f221234 4 months ago 13.3kB
可以看出，已經從遠程倉庫拉取到hello-world鏡像到本地了。
3、設置開機啟動Docker
sudo systemctl enable docker.service
sudo systemctl enable containerd.service
禁用開機啟動將enable改為disabled。
4、卸載Docker
刪除安裝包
sudo yum remove docker-ce docker-ce-cli containerd.io
刪除鏡像容器、配置文件等內容
sudo rm -rf /var/lib/docker
sudo rm -rf /var/lib/containerd