卸載yum並重新安裝並配置源

 

# 查看所有yum組件
rpm -qa | grep yum    


#將所有的組件卸載掉
rpm -qa | grep yum | xargs rpm -e --nodeps

#一般下面這三個就行了（太慢可以從http://mirrors.163.com/centos/7/os/x86_64/Packages/ 下載）
wget http://mirror.centos.org/centos/7/os/x86_64/Packages/yum-3.4.3-150.el7.centos.noarch.rpm
wget http://mirror.centos.org/centos/7/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
wget http://mirror.centos.org/centos/7/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-45.el7.noarch.rpm

#先安裝這個
rpm -ivh yum-metadata-parser-1.1.4-10.el7.x86_64.rpm

#如下兩個有依賴同時安裝
rpm -ivh yum-3.4.3-150.el7.centos.noarch.rpm yum-plugin-fastestmirror-1.1.31-45.el7.noarch.rpm

#配置阿里源參照
https://blog.csdn.net/lovemysea/article/details/79552952