Centos7重新安装yum

• rpm -qa|grep yum
• 然后用下面的命令删除出现的xxx包：
• rpm -e --nodeps xxx

下载

• python-urlgrabber-3.10-8.el7.noarch.rpm
• python-iniparse-0.4-9.el7.noarch.rpm
• yum-plugin-fastestmirror-1.1.31-40.el7.noarch.rpm
• yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
• yum-3.4.3-150.el7.centos.noarch.rpm

地址：http://mirrors.163.com/centos/7/os/x86_64/Packages/

安装

rpm -ivh python-iniparse-0.3.1-2.1.el6.noarch.rpm

rpm -ivh python-urlgrabber-3.10-8.el7.noarch.rpm

rpm -ivh yum-.rpm yum-metadata-parser-.rpm yum-plugin-fastestmirror-*.rpm

修改来源文件

`cd /etc/yum.repos.dwget http://mirrors.163.com/.help/CentOS7-Base-163.repo`

根据centos版本，修改：vi CentOS6-Base-163.repo，$releasever替換成7 改名成默认repo：mv CentOS7-Base-163.repo CentOS7-Base.repo

• yum makecache
• yum clean all
• yum update

如果执行上面的命令，出现如下错误，可能就是yum源没有挂载上 Couldn't open file /mnt/repodata/repomd.xml 执行命令挂载yum源：mount -o loop /dev/sr0 /mnt

yum卸载安装

http://blog.csdn.net/delphi1234/article/details/51546798