yum源，网络源（阿里源）
配置网络源
我们主要的源在/etc/yum.repos.d/
其中，CentOS-Base.repo为网络源
vim CentOS-Base.repo //使用的是阿里的源
如何使用（通过wget工具下载阿里源）
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
或者mkdir CentOS-Base.repo （注：repo结尾）
[base]
name=CentOS-
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releasever enabled=1 failovermethod=priority baseurl=http://mirrors.cloud.aliyuncs.com/centos/
releaseverenabled=1failovermethod=prioritybaseurl=http://mirrors.cloud.aliyuncs.com/centos/releasever/os/$basearch/
gpgcheck=1
gpgkey=http://mirrors.cloud.aliyuncs.com/centos/RPM-GPG-KEY-CentOS-7
[updates]
name=CentOS-
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releasever enabled=1 failovermethod=priority baseurl=http://mirrors.cloud.aliyuncs.com/centos/
releaseverenabled=1failovermethod=prioritybaseurl=http://mirrors.cloud.aliyuncs.com/centos/releasever/updates/$basearch/
gpgcheck=1
gpgkey=http://mirrors.cloud.aliyuncs.com/centos/RPM-GPG-KEY-CentOS-7
[extras]
name=CentOS-
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releasever enabled=1 failovermethod=priority baseurl=http://mirrors.cloud.aliyuncs.com/centos/
releaseverenabled=1failovermethod=prioritybaseurl=http://mirrors.cloud.aliyuncs.com/centos/releasever/extras/$basearch/
gpgcheck=1
gpgkey=http://mirrors.cloud.aliyuncs.com/centos/RPM-GPG-KEY-CentOS-7
换好阿里源，进行yum源的更新
yum list
另：安装epel源（即：扩展源，是安装一些依赖使用的源、阿里源）
wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
安装完查看
vim epel.repo
更新yum源
yum list
注：阿里官方源地址
https://developer.aliyun.com/mirror/
