Docker 要求 CentOS 系统的内核版本高于 3.10 ，通过 uname -r 命令查看你当前的CentOS的内核版本，来验证你的CentOS 版本是否支持 Docker 。
[root@localhost ~]# uname -r 3.10.0-957.el7.x86_64
使用 root 权限登录 CentOS。确保 yum 包更新到最新，如下：
[root@localhost ~]# yum update Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * base: mirrors.cn99.com * extras: mirrors.aliyun.com * updates: mirrors.aliyun.com No packages marked for update [root@localhost ~]#
判断当前系统是否已经安装docker，如下：
[root@localhost ~]# yum list installed | grep docker [root@localhost ~]#
上面表示没有安装过docker。如果你安装过docker，可以使用“yum remove”删除docker。如下：
[root@localhost ~]# yum remove docker docker-common docker-selinux docker-engine
安装需要的软件包， yum-util 提供yum-config-manager功能，另外两个是devicemapper驱动依赖的。如下：
[root@localhost ~]# yum install -y yum-utils device-mapper-persistent-data lvm2 Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * base: mirrors.cn99.com * extras: mirrors.aliyun.com * updates: mirrors.aliyun.com Package device-mapper-persistent-data-0.7.3-3.el7.x86_64 already installed and latest version Package 7:lvm2-2.02.180-10.el7_6.7.x86_64 already installed and latest version Resolving Dependencies --> Running transaction check ---> Package yum-utils.noarch 0:1.1.31-50.el7 will be installed --> Processing Dependency: python-kitchen for package: yum-utils-1.1.31-50.el7.noarch --> Processing Dependency: libxml2-python for package: yum-utils-1.1.31-50.el7.noarch --> Running transaction check ---> Package libxml2-python.x86_64 0:2.9.1-6.el7_2.3 will be installed ---> Package python-kitchen.noarch 0:1.1.1-5.el7 will be installed --> Processing Dependency: python-chardet for package: python-kitchen-1.1.1-5.el7.noarch --> Running transaction check ---> Package python-chardet.noarch 0:2.2.1-1.el7_1 will be installed --> Finished Dependency Resolution ... Installed: yum-utils.noarch 0:1.1.31-50.el7 Dependency Installed: libxml2-python.x86_64 0:2.9.1-6.el7_2.3 python-chardet.noarch 0:2.2.1-1.el7_1 python-kitchen.noarch 0:1.1.1-5.el7 Complete!
设置yum docker源，如下：
[root@localhost ~]# yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo Loaded plugins: fastestmirror adding repo from: https://download.docker.com/linux/centos/docker-ce.repo grabbing file https://download.docker.com/linux/centos/docker-ce.repo to /etc/yum.repos.d/docker-ce.repo repo saved to /etc/yum.repos.d/docker-ce.repo [root@localhost ~]#
可以查看所有仓库中所有docker版本，并选择特定版本安装。如下：
[root@localhost ~]# yum list docker-ce --showduplicates | sort -r * updates: mirrors.aliyun.com Loading mirror speeds from cached hostfile Loaded plugins: fastestmirror * extras: mirrors.aliyun.com docker-ce.x86_64 3:18.09.6-3.el7 docker-ce-stable docker-ce.x86_64 3:18.09.5-3.el7 docker-ce-stable docker-ce.x86_64 3:18.09.4-3.el7 docker-ce-stable docker-ce.x86_64 3:18.09.3-3.el7 docker-ce-stable docker-ce.x86_64 3:18.09.2-3.el7 docker-ce-stable docker-ce.x86_64 3:18.09.1-3.el7 docker-ce-stable docker-ce.x86_64 3:18.09.0-3.el7 docker-ce-stable docker-ce.x86_64 18.06.3.ce-3.el7 docker-ce-stable docker-ce.x86_64 18.06.2.ce-3.el7 docker-ce-stable 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 docker-ce.x86_64 17.03.0.ce-1.el7.centos docker-ce-stable * base: mirrors.cn99.com Available Packages [root@localhost ~]#
安装docker，如下：
# 由于repo中默认只开启stable仓库，故这里安装的是最新稳定版17.12.0 [root@localhost ~]# sudo yum install docker-ce Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * base: mirrors.cn99.com * extras: mirrors.aliyun.com * updates: mirrors.aliyun.com Resolving Dependencies ...
启动并加入开机启动。如下：
# 启动docker [root@localhost ~]# systemctl start docker # 设置开机启动 [root@localhost ~]# systemctl enable docker Created symlink from /etc/systemd/system/multi-user.target.wants/docker.service to /usr/lib/systemd/system/docker.service. [root@localhost ~]#
验证安装是否成功。如下：
[root@localhost ~]# docker version Client: Version: 18.09.6 API version: 1.39 Go version: go1.10.8 Git commit: 481bc77156 Built: Sat May 4 02:34:58 2019 OS/Arch: linux/amd64 Experimental: false Server: Docker Engine - Community Engine: Version: 18.09.6 API version: 1.39 (minimum version 1.12) Go version: go1.10.8 Git commit: 481bc77 Built: Sat May 4 02:02:43 2019 OS/Arch: linux/amd64 Experimental: false
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