1.检查是否安装yum包。查看RHEL是否安装了yum,若是安装了,那么又有哪些yum包:
rpm -qa |grep yum
2 删除redhat自带的yum包
rpm -qa|grep yum|xargs rpm -e --nodeps(不检查依赖,直接删除rpm包)
rpm -qa |grep yum (查询确认)
3.下载新的yum包。使用Centos6.5的yum包
1) 查看版本号和系统类别:
cat /etc/redhat-release
我的是 Red Hat Enterprise Linux Server release 6.4 (Santiago)
arch ---x86_64
2)根据上一步,找到对应的yum包,然后下载。我的服务器对应的为(centos 7 可以访问http://mirror.centos.org/centos/7/os/x86_64/Packages ,去找对应的包):
wget http://mirror.centos.org/centos/6/os/x86_64/Packages/yum-3.2.29-73.el6.centos.noarch.rpm wget http://mirror.centos.org/centos/6/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.30-37.el6.noarch.rpm wget http://mirror.centos.org/centos/6/os/x86_64/Packages/yum-metadata-parser-1.1.2-16.el6.x86_64.rpm
依赖 包:
wget http://mirror.centos.org/centos/6/os/x86_64/Packages/python-urlgrabber-3.9.1-11.el6.noarch.rpm
3) 安装:
说明:四个一起安装 ,但我的机器上已预装的有 python,所以先强制安装 python-urlgrabber-3.9.1-11.el6.noarch.rpm
rpm -ivh --force python-urlgrabber-3.9.1-11.el6.noarch.rpm
然后再安装 yum 的三个
rpm -ivh yum*.rpm
4)更换yum源,将原有源删除或备份到别的目下下:
cd /etc/yum.repos.d/ wget http://mirrors.163.com/.help/CentOS6-Base-163.repo
vi CentOS6-Base-163.repo
编辑文件,把文件里面的$releasever全部替换为版本号:6(注意,不是6.4! , centos 替换为7)最后保存!
4.清除原有缓存,重建缓存:
clean all
yum makecache
5.更新系统:
yum update 可以不更新。
centos7 yum 下载地址
wget http://mirror.centos.org/centos/7/os/x86_64/Packages/yum-3.4.3-161.el7.centos.noarch.rpm
wget http://mirror.centos.org/centos/7/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-50.el7.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/python-urlgrabber-3.10-9.el7.noarch.rpm