Docker 分为开源免费的 CE（Community Edition）和收费的 EE（Enterprise Edition）。在Docker-CE官方的源中，有stable、edge和test三个版本。本文安装的是免费的docker-ce的stable版本。
1 Set up the repository
yum-utilsyum-config-managerdevice-mapper-persistent-datadevicemapper
1 yum install -y yum-utils device-mapper-persistent-data lvm2
stableedgetest
1 yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
//使用yum-config-manager添加docker-ce的源。也可以使用vim或者wget将源放到/etc/yum.repos.d/文件夹。
edgetestdocker.repo
1 yum-config-manager --enable docker-ce-edge 2 yum-config-manager --enable docker-ce-test
edgetestyum-config-managercommand with the--disable--enableedgetest repository.
1 yum-config-manager --disable docker-ce-edge 2 yum-config-manager --disable docker-ce-test
2 Install Docker CE
latest version
1 yum install docker-ce
docker
specific version
# 1) List and sort the versions available in your repo. This example sorts results by version number, highest to lowest, and is truncated:
1 yum list docker-ce --showduplicates | sort
...
docker-ce.aarch64 18.03.1.ce-1.el7.centos docker-ce-stable
docker-ce.aarch64 18.03.1.ce-1.el7.centos @docker-ce-stable
docker-ce.aarch64 18.03.0.ce-1.el7.centos docker-ce-stable
suffix in this example).
# 2) Install a specific version by its fully qualified package name, which is the package name (docker-ce) plus the version string (2nd column) up to the first hyphen, separated by a hyphen (-docker-ce-18.03.0.ce.
1 yum install docker-ce-<VERSION STRING>
eg.
1 yum install docker-ce-18.03.1.ce
docker
3 Start Docker
1 systemctl enable docker 2 systemctl start dokcer
//enable to start with system boot.
4 Verify Docker
dockerhello-world
1 systemctl status docker 2 docker run hello-world
...
Hello from Docker!
This message shows that your installation appears to be working correctly.
//This command downloads a test image and runs it in a container. When the container runs, it prints an informational message and exits.
# Verify docker via httpd
1 docker run -d -p 80:80 httpd
//上一命令执行的过程如下：
1) 从Docker Hub下载httpd镜像，其中，镜像中已经安装好了Apache HTTP Server。
2) 启动httpd容器，并将容器的80端口映射到host的80端口，前提是host的80端口是可以访问的。
//下面就可以通过浏览器访问host_IP验证httpd容器是否启动正常（输出It works!为正常）。
5 Docker Accelerator
# Docker Hub的服务器在国外，下载镜像会比较慢。DaoCloud、阿里云提供了国内的Docker镜像服务。
# 以DaoCloud为例，配置Docker加速器
1) 访问DaoCloud官网(https://www.daocloud.io/)，点击更多->加速器，也可直接访问(https://www.daocloud.io/mirror#accelerator-doc)。
2) 页面跳转后点击立即使用，此时需要登录，如果没有可以免费注册。
1 curl -sSL https://get.daocloud.io/daotools/set_mirror.sh | sh -s http://xxxxxxxx.m.daocloud.io
4) 重新启动Docker
1 systemctl daemon-reload 2 systemctl restart docker
6 Reference
https://docs.docker.com/install/linux/docker-ce/centos/
http://www.cnblogs.com/CloudMan6/p/6727146.html
https://www.daocloud.io/mirror#accelerator-doc
docker-ce install on CentOS7-mini
原文：https://www.cnblogs.com/hxt-lingmo/p/9224400.html