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官方文档：https://docs.docker.com/install/linux/docker-ce/centos/

1. 系统环境

[root@linux-node2 ~]# cat /etc/redhat-release     CentOS Linux release 7.1.1503 (Core)     [root@linux-node2 ~]# uname -r    3.10.0-229.el7.x86_64    [root@linux-node2 ~]# getenforce     Disabled    [root@linux-node2 ~]# systemctl status firewalld    firewalld.service - firewalld - dynamic firewall daemon       Loaded: loaded (/usr/lib/systemd/system/firewalld.service; disabled)       Active: inactive (dead)

2. 卸载旧的版本

[root@linux-node2 ~]# yum remove docker \                  docker-client \                  docker-client-latest \                  docker-common \                  docker-latest \                  docker-latest-logrotate \                  docker-logrotate \                  docker-eng

3. 安装Docker CE

3.1 通过资源库安装

3.1.1 安装所需要的包。

yum-utils提供了yum-config-manager实用程序，devicemapper存储驱动程序需要设备-mapper-persistent-data和lvm2。

yum install -y yum-utils

3.1.2 添加安装所需要的官方源。

#设置镜像    yum-config-manager \        --add-repo \        https://download.docker.com/linux/centos/docker-ce.repo#这里我们使用阿里云的    yum-config-manager \        --add-repo \        http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo#这里我们使用腾讯云的wget -O /etc/yum.repos.d/docker-ce.repo https://download.docker.com/linux/centos/docker-ce.reposudo sed -i 's+download.docker.com+mirrors.cloud.tencent.com/docker-ce+' /etc/yum.repos.d/docker-ce.repo#更新软件包索引	yum makecache fast

3.1.3 安装Docker CE

a 安装Docker CE的最新版本

#docker-ce 社区版 ee 企业版    yum install -y docker-ce docker-ce-cli containerd.io

b 安装Docker CE的指定版本

yum list docker-ce --showduplicates | sort -r    docker-ce.x86_64            18.06.1.ce-3.el7                    docker-ce-stable    docker-ce.x86_64            18.06.0.ce-3.el7                    docker-ce-stable    docker-ce.x86_64            18.03.1.ce-1.el7.centos             docker-ce-stable    docker-ce.x86_64            18.03.0.ce-1.el7.centos             docker-ce-stable    docker-ce.x86_64            17.12.1.ce-1.el7.centos             docker-ce-stable    docker-ce.x86_64            17.12.0.ce-1.el7.centos             docker-ce-stable    docker-ce.x86_64            17.09.1.ce-1.el7.centos             docker-ce-stable    docker-ce.x86_64            17.09.0.ce-1.el7.centos             docker-ce-stable    docker-ce.x86_64            17.06.2.ce-1.el7.centos             docker-ce-stable    docker-ce.x86_64            17.06.1.ce-1.el7.centos             docker-ce-stable    docker-ce.x86_64            17.06.0.ce-1.el7.centos             docker-ce-stable    docker-ce.x86_64            17.03.3.ce-1.el7                    docker-ce-stable    docker-ce.x86_64            17.03.2.ce-1.el7.centos             docker-ce-stable    docker-ce.x86_64            17.03.1.ce-1.el7.centos             docker-ce-stable    #返回的列表取决于启用了哪些存储库，并且特定于您的CentOS版本    yum install docker-ce-18.06.1.ce    #yum install docker-ce-
   

3.1.4 启动docker

#启动docker    systemctl start docker        #通过运行hello-world镜像来验证docker是否正确安装。    #这个命令下载一个测试映像并在容器中运行它。当容器运行时，它打印一条信息消息并退出。    docker run hello-world    Unable to find image 'hello-world:latest' locally    latest: Pulling from library/hello-world    d1725b59e92d: Pull complete     Digest: sha256:0add3ace90ecb4adbf7777e9aacf18357296e799f81cabc9fde470971e499788    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/

3.2 通过RPM包安装

3.2.1 下载Docker CE的RPM包

访问https://download.docker.com/linux/centos/7/x86_64/stable/Packages/，下载您想要安装的Docker版本的.rpm文件。

3.2.2 安装Docker CE

yum install /path/to/package.rpm

3.2.3 启动docker

#启动docker    systemctl start docker        #通过运行hello-world镜像来验证docker是否正确安装。    #这个命令下载一个测试映像并在容器中运行它。当容器运行时，它打印一条信息消息并退出。    docker run hello-world    Unable to find image 'hello-world:latest' locally    latest: Pulling from library/hello-world    d1725b59e92d: Pull complete     Digest: sha256:0add3ace90ecb4adbf7777e9aacf18357296e799f81cabc9fde470971e499788    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/#查看下载的hello-world镜像[root@VM-16-11-centos ~]# docker imagesREPOSITORY    TAG       IMAGE ID       CREATED       SIZEhello-world   latest    d1165f221234   7 weeks ago   13.3kB

4. 了解卸载Docker CE

#卸载依赖    yum remove docker-ce docker-ce-cli containerd.io    #删除主机上所有镜像、容器和卷    rm -rf /var/lib/docker    rm -rf /var/lib/containerd

配置镜像加速

cat > /etc/docker/daemon.json << EOF{"registry-mirrors": ["https://mirror.ccs.tencentyun.com"  ]}EOFsystemctl daemon-reloadsystemctl restart docker