centOS操作系统下如何安装yum
<p><strong>1、查看已安装的yum</strong></p><p>rpm -qa|grep yum</p>
<p><strong>2、删除已有的yum</strong></p>
<p>rpm -aq<span class="token operator">|<span class="token function">grep yum<span class="token operator">|<span class="token function">xargs rpm -e --nodeps</span></span></span></span></p>
<p><strong>3、下载以下安装包</strong></p>
<p>wget http://tel.mirrors.163.com/centos/7/os/x86_64/Packages/python-2.7.5-89.el7.x86_64.rpm</p>
<p>wget http://tel.mirrors.163.com/centos/7/os/x86_64/Packages/python-iniparse-0.4-9.el7.noarch.rpm</p>
<p>wget http://tel.mirrors.163.com/centos/7/os/x86_64/Packages/yum-3.4.3-168.el7.centos.noarch.rpm</p>
<p>wget http://tel.mirrors.163.com/centos/7/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpm</p>
<p>wget http://tel.mirrors.163.com/centos/7/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-54.el7_8.noarch.rpm</p>
<p>如果找不到以上版本，可以到http://tel.mirrors.163.com/centos/7/os/x86_64/Packages/下载最新版本</p>
<p><strong>4、安装</strong></p>
<p>rpm -ivh python-2.7.5-89.el7.x86_64.rpm python-iniparse-0.4-9.el7.noarch.rpm --nodeps --force</p>
<p>rpm -ivh yum-metadata-parser-1.1.4-10.el7.x86_64.rpm --nodeps --force</p>
<p>rpm -ivh yum-3.4.3-168.el7.centos.noarch.rpm yum-plugin-fastestmirror-1.1.31-54.el7_8.noarch.rpm --nodeps --force</p>
<p><strong>5、更改yum源</strong></p>
<p><strong>1）备份、下载配置文件</strong></p>
<p><strong>a.首先备份/etc/yum.repos.d/CentOS-Base.repo</strong></p>
<p>mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup</p>
<p><strong><strong>b.到该网站http://mirrors.163.com/.help/centos.html下载配置文件，重命名为CentOS-Base.repo，</strong> 放入/etc/yum.repos.d/(操作前请做好相应备份)</strong></p>
<p>CentOS7</p>
<p>CentOS6</p>
<p>CentOS5</p>
<p><strong>c.运行以下命令更新缓存</strong></p>
<p>yum clean all<br>yum makecache</p>
<p><strong>2）修改配置文件</strong></p>
<p><strong>a.运行命令，打开CentOS-Base.repo文件</strong></p>
<p>cd /etc/yum.repos.d</p>
<p>vim CentOS-Base.repo</p>
<p><strong>b.将以下内容更换CentOS-Base.repo里面的内容</strong></p>
<p># CentOS-Base.repo<br>#<br># The mirror system uses the connecting IP address of the client and the<br># update status of each mirror to pick mirrors that are updated to and<br># geographically close to the client.You should use this for CentOS updates<br># unless you are manually picking other mirrors.<br>#<br># If the mirrorlist= does not work for you, as a fall back you can try the<br># remarked out baseurl= line instead.<br>#<br>#<br> <br><br>name=CentOS-$releasever - Base<br>#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os<br>baseurl=https://mirrors.ustc.edu.cn/centos/$releasever/os/$basearch/<br>gpgcheck=1<br>gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7<br> <br>#released updates<br><br>name=CentOS-$releasever - Updates<br># mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates<br>baseurl=https://mirrors.ustc.edu.cn/centos/$releasever/updates/$basearch/<br>gpgcheck=1<br>gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7<br> <br>#additional packages that may be useful<br><br>name=CentOS-$releasever - Extras<br># mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras<br>baseurl=https://mirrors.ustc.edu.cn/centos/$releasever/extras/$basearch/<br>gpgcheck=1<br>gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7<br> <br>#additional packages that extend functionality of existing packages<br><br>name=CentOS-$releasever - Plus<br># mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus<br>baseurl=https://mirrors.ustc.edu.cn/centos/$releasever/centosplus/$basearch/<br>gpgcheck=1<br>enabled=0<br>gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7</p>
<p><strong>c.配置完成后更新缓存</strong></p>
<p>yum clean all<br>yum makecache</p><br><br>
来源：https://www.cnblogs.com/zhuifengshaonianxxyd/p/16550704.html
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