redhat 7.2安装docker

1、root账户登录，查看内核版本

uname -a   

(检查内核版本，返回的值大于3.10即可)

把yum包更新到最新

yum update

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

yum install -y yum-utils device-mapper-persistent-data lvm2/

2、设置yum源

yum-config-manager --add-repo [https://download.docker.com/linux/centos/docker-ce.repo](https://download.docker.com/linux/centos/docker-ce.repo)

3、如果yum不可用,用阿里yum

参考：redHat 7.2 安装yum 切阿里源

cd /etc/yum.repos.d

wget http://mirrors.aliyun.com/repo/Centos-7.repo

下载完成

修改刚下载的文件 将所有$releasever替换为7

# vim /etc/yum.repos.d/CentOS-Base.repo 

# :%s/$releasever/7/g

修改配置文件CnetOS-Base.repo，通过vim编辑器打开CnetOS-Base.repo ， 替换

releaserver/6/g ，wq保存退出。

注：g标示全局替换，将$releaserver替换为6，这里替换的是centos版本，安装cdh时候回到指定目录下载相关文件，最好是在浏览器打开baseurl路径，查看指定路径下的数据包是否存在，不存在请使用其他版本。

运行以下命令即可

yum clean all 

yum makecache

yum update

4、阿里yum的地址如下

# CentOS-Base.repo

#

# The mirror system uses the connecting IP address of the client and the

# update status of each mirror to pick mirrors that are updated to and

# geographically close to the client.  You should use this for CentOS updates

# unless you are manually picking other mirrors.

#

# If the mirrorlist= does not work for you, as a fall back you can try the

# remarked out baseurl= line instead.

#

#

[base]

name=CentOS-7 - Base - mirrors.aliyun.com

failovermethod=priority

baseurl=http://mirrors.aliyun.com/centos/7/os/$basearch/

        http://mirrors.aliyuncs.com/centos/7/os/$basearch/

        http://mirrors.cloud.aliyuncs.com/centos/7/os/$basearch/

gpgcheck=1

gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

#released updates

[updates]

name=CentOS-7 - Updates - mirrors.aliyun.com

failovermethod=priority

baseurl=http://mirrors.aliyun.com/centos/7/updates/$basearch/

        http://mirrors.aliyuncs.com/centos/7/updates/$basearch/

        http://mirrors.cloud.aliyuncs.com/centos/7/updates/$basearch/

gpgcheck=1

gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

#additional packages that may be useful

[extras]

name=CentOS-7 - Extras - mirrors.aliyun.com

failovermethod=priority

baseurl=http://mirrors.aliyun.com/centos/7/extras/$basearch/

        http://mirrors.aliyuncs.com/centos/7/extras/$basearch/

        http://mirrors.cloud.aliyuncs.com/centos/7/extras/$basearch/

gpgcheck=1

gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

#additional packages that extend functionality of existing packages

[centosplus]

name=CentOS-7 - Plus - mirrors.aliyun.com

failovermethod=priority

baseurl=http://mirrors.aliyun.com/centos/7/centosplus/$basearch/

        http://mirrors.aliyuncs.com/centos/7/centosplus/$basearch/

        http://mirrors.cloud.aliyuncs.com/centos/7/centosplus/$basearch/

gpgcheck=1

enabled=0

gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

#contrib - packages by Centos Users

[contrib]

name=CentOS-7 - Contrib - mirrors.aliyun.com

failovermethod=priority

baseurl=http://mirrors.aliyun.com/centos/7/contrib/$basearch/

        http://mirrors.aliyuncs.com/centos/7/contrib/$basearch/

        http://mirrors.cloud.aliyuncs.com/centos/7/contrib/$basearch/

gpgcheck=1

enabled=0

gpgkey=http://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

5、启动

启动Docker

systemctl start docker

设置开机启动

systemctl enable docker

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