centos不小心dnf remove yum卸载了，重新下载y

网易镜像源下载地址 https://mirrors.163.com/centos-vault/7.0.1406/os/x86_64/Packages/

pygpgme-0.3-9.el7.x86_64.rpm

pyliblzma-0.5.3-11.el7.x86_64.rpm

python-2.7.5-16.el7.x86_64.rpm

python-iniparse-0.4-9.el7.noarch.rpm

python-libs-2.7.5-16.el7.x86_64.rpm

python-pycurl-7.19.0-17.el7.x86_64.rpm

python-urlgrabber-3.10-4.el7.noarch.rpm

pyxattr-0.5.1-5.el7.x86_64.rpm

yum-3.4.3-118.el7.centos.noarch.rpm

yum-metadata-parser-1.1.4-10.el7.x86_64.rpm

yum-plugin-fastestmirror-1.1.31-24.el7.noarch.rpm

安装下载的rpm 依赖包

rpm -ivh ./*