redhat7.4修改yum 源为CentOS网易yum源

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　　# 创建目录
　　mkdir /data/tools/centos_yum
　　cd /data/tools/centos_yum
　　# 下载软件包，若地址不对，到此网站上找http://mirrors.163.com/centos/7/os/x86_64/Packages/
　　wget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-3.4.3-154.el7.centos.noarch.rpm
　　wget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-cron-3.4.3-154.el7.centos.noarch.rpm
　　wget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
　　wget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-42.el7.noarch.rpm
　　wget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-utils-1.1.31-42.el7.noarch.rpm
　　wget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-updateonboot-1.1.31-42.el7.noarch.rpm
　　# 查看系统中已安装的软件包
　　rpm -qa | grep yum
　　# 卸载系统中已有的yum 软件，此处后面跟的软件为上条命令查询的结果，不要忘记最后的 --nodeps
　　rpm -e yum-langpacks-0.4.2-7.el7.noarch yum-3.4.3-154.el7.noarch yum-metadata-parser-1.1.4-10.el7.x86_64 yum-rhn-plugin-2.0.1-9.el7.noarch yum-utils-1.1.31-42.el7.noarch --nodeps
　　# 安装
　　rpm -ivh yum-*
　　# 写 yum 配置文件
　　vim /etc/yum.repos.d/CentOS-Base.repo
　　*********************************************************************
　　#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 - 163.com
　　#mirrorlist=http://mirrorlist.centos.org/?release=$7&arch=$basearch&repo=os
　　baseurl=http://mirrors.163.com/centos/7/os/$basearch/
　　gpgcheck=1
　　gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7
　　#released updates

[updates]

　　name=CentOS-$7 - Updates - 163.com
　　#mirrorlist=http://mirrorlist.centos.org/?release=$7&arch=$basearch&repo=updates
　　baseurl=http://mirrors.163.com/centos/7/updates/$basearch/
　　gpgcheck=1
　　gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7
　　#additional packages that may be useful

[extras]

　　name=CentOS-$7 - Extras - 163.com
　　#mirrorlist=http://mirrorlist.centos.org/?release=$7&arch=$basearch&repo=extras
　　baseurl=http://mirrors.163.com/centos/7/extras/$basearch/
　　gpgcheck=1
　　gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7
　　#additional packages that extend functionality of existing packages

[centosplus]

　　name=CentOS-$7 - Plus - 163.com
　　baseurl=http://mirrors.163.com/centos/7/centosplus/$basearch/
　　gpgcheck=1
　　enabled=0
　　gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7
　　*********************************************************************
　　yum clean all