今天心血来潮，想看下docker的网络，随手装了个虚拟机centos7.9,便开始网上找文档安装docker。做了记录，以后方便查找
一、安装docker
1、Docker 要求 CentOS 系统的内核版本高于 3.10 ，查看本页面的前提条件来验证你的CentOS 版本是否支持 Docker 。
通过 uname -r 命令查看你当前的内核版本
$ uname -r
2、使用 root 权限登录 Centos。确保 yum 包更新到最新。
$ sudo yum update
3、卸载旧版本(如果安装过旧版本的话)
$ sudo yum remove docker docker-common docker-selinux docker-engine
4、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
$ sudo yum install -y yum-utils device-mapper-persistent-data lvm2
5、设置yum源
[root@linux-119 yum.repos.d]# 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
6、安装docker
$ sudo yum install docker-ce #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
$ sudo yum install <FQPN> # 例如：sudo yum install docker-ce-17.12.0.ce
安装报错如下：
[root@linux-119 yum.repos.d]# sudo yum install docker-ce-17.12.0.ce
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
Resolving Dependencies
--> Running transaction check
---> Package docker-ce.x86_64 0:17.12.0.ce-1.el7.centos will be installed
--> Processing Dependency: container-selinux >= 2.9 for package: docker-ce-17.12.0.ce-1.el7.centos.x86_64
--> Processing Dependency: libcgroup for package: docker-ce-17.12.0.ce-1.el7.centos.x86_64
--> Processing Dependency: libltdl.so.7()(64bit) for package: docker-ce-17.12.0.ce-1.el7.centos.x86_64
--> Running transaction check
---> Package docker-ce.x86_64 0:17.12.0.ce-1.el7.centos will be installed
--> Processing Dependency: container-selinux >= 2.9 for package: docker-ce-17.12.0.ce-1.el7.centos.x86_64
---> Package libcgroup.x86_64 0:0.41-21.el7 will be installed
---> Package libtool-ltdl.x86_64 0:2.4.2-22.el7_3 will be installed
--> Finished Dependency Resolution
Error: Package: docker-ce-17.12.0.ce-1.el7.centos.x86_64 (docker-ce-stable)
Requires: container-selinux >= 2.9
You could try using --skip-broken to work around the problem
You could try running: rpm -Va --nofiles --nodigest
[root@linux-119 yum.repos.d]# sudo yum install docker-ce-17.03.0.ce
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
Resolving Dependencies
--> Running transaction check
---> Package docker-ce.x86_64 0:17.03.0.ce-1.el7.centos will be installed
--> Processing Dependency: docker-ce-selinux >= 17.03.0.ce-1.el7.centos for package: docker-ce-17.03.0.ce-1.el7.centos.x86_64
Package docker-ce-selinux is obsoleted by docker-ce, but obsoleting package does not provide for requirements
--> Processing Dependency: libcgroup for package: docker-ce-17.03.0.ce-1.el7.centos.x86_64
--> Processing Dependency: libltdl.so.7()(64bit) for package: docker-ce-17.03.0.ce-1.el7.centos.x86_64
--> Running transaction check
---> Package docker-ce.x86_64 0:17.03.0.ce-1.el7.centos will be installed
--> Processing Dependency: docker-ce-selinux >= 17.03.0.ce-1.el7.centos for package: docker-ce-17.03.0.ce-1.el7.centos.x86_64
Package docker-ce-selinux is obsoleted by docker-ce, but obsoleting package does not provide for requirements
---> Package libcgroup.x86_64 0:0.41-21.el7 will be installed
---> Package libtool-ltdl.x86_64 0:2.4.2-22.el7_3 will be installed
--> Finished Dependency Resolution
Error: Package: docker-ce-17.03.0.ce-1.el7.centos.x86_64 (docker-ce-stable)
Requires: docker-ce-selinux >= 17.03.0.ce-1.el7.centos
Available: docker-ce-selinux-17.03.0.ce-1.el7.centos.noarch (docker-ce-stable)
docker-ce-selinux = 17.03.0.ce-1.el7.centos
Available: docker-ce-selinux-17.03.1.ce-1.el7.centos.noarch (docker-ce-stable)
docker-ce-selinux = 17.03.1.ce-1.el7.centos
Available: docker-ce-selinux-17.03.2.ce-1.el7.centos.noarch (docker-ce-stable)
docker-ce-selinux = 17.03.2.ce-1.el7.centos
Available: docker-ce-selinux-17.03.3.ce-1.el7.noarch (docker-ce-stable)
docker-ce-selinux = 17.03.3.ce-1.el7
You could try using --skip-broken to work around the problem
You could try running: rpm -Va --nofiles --nodigest
该报错解决如下：
#要先安装docker-ce-selinux-17.03.2.ce，否则安装docker-ce会报错
yum install https://download.docker.com/linux/centos/7/x86_64/stable/Packages/docker-ce-selinux-17.03.2.ce-1.el7.centos.noarch.rpm
#然后再安装 docker-ce-17.03.2.ce，就能正常安装
yum install docker-ce-17.03.2.ce-1.el7.centos
8、启动并加入开机启动
$ sudo systemctl start docker
$ sudo systemctl enable docker
9、验证安装是否成功(有client和service两部分表示docker安装启动都成功了)
$ docker version
[root@linux-119 yum.repos.d]# docker version
Client:
Version: 17.03.2-ce
API version: 1.27
Go version: go1.7.5
Git commit: f5ec1e2
Built: Tue Jun 27 02:21:36 2017
OS/Arch: linux/amd64
Server:
Version: 17.03.2-ce
API version: 1.27 (minimum version 1.12)
Go version: go1.7.5
Git commit: f5ec1e2
Built: Tue Jun 27 02:21:36 2017
OS/Arch: linux/amd64
Experimental: false
