錯誤描述
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
解決步驟
刪除redhat原有的yum
rpm -aq|grep yum|xargs rpm -e --nodeps
下載yum安裝文件
#到這個網站去下載如下RPM包 http://mirrors.163.com/centos/7/os/x86_64/Packages/
wget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-3.4.3-163.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-1.1.31-52.el7.noarch.rpm
wget http://mirrors.163.com/centos/7/os/x86_64/Packages/python-iniparse-0.4-9.el7.noarch.rpm
ll
進行安裝yum
rpm -ivh --force --nodeps python-iniparse-0.4-9.el7.noarch.rpm; rpm -ivh --force --nodeps yum-metadata-parser-1.1.4-10.el7.x86_64.rpm rpm -ivh --force --nodeps yum-3.4.3-163.el7.centos.noarch.rpm yum-plugin-fastestmirror-1.1.31-52.el7.noarch.rpm
注意:最后兩個包必需同時安裝，否則會相互依賴
設置源
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo; cd /etc/yum.repos.d; ll
清除原有緩存
yum clean all
重建緩存，以提高搜索安裝軟件的速度
yum makecache
如果有提示錯誤，運行下面的命令：[Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404 Not Found"
sed -i 's/\$releasever/7/' CentOS-Base.repo
備注：把文件里的$releasever替換為7 最后：重新生成緩存，數字不為0，就OK了
yum clean all; yum makecache
更新系統
yum update