Redhat系统安装CentOS的yum源

1、首先查看redhat系统本身所安装的那些yum 软件包：

rpm -qa | grep yum

2、卸载这些软件包（上一步出现多少安装包就卸载多少个）；

rpm -e  yum-（安装包名）  --nodeps

3、保证本机电脑能上网；

ping www.baidu.com

4、进入以下网站上面查看软件包的版本是否升级或者找到自己系统所对应的文件包版本更新；
CentOS网络源地址：http://centos.ustc.edu.cn/centos/
5、找到自己所需要的版本下载：

wget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-3.4.3-150.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-utils-1.1.31-40.el7.noarch.rpm
wget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-updateonboot-1.1.31-40.el7.noarch.rpm
wget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-40.el7.noarch.rpm

6、查看下载完成结果；

ls
anaconda-ks.cfg                              yum-plugin-fastestmirror-1.1.31-40.el7.noarch.rpm
initial-setup-ks.cfg                        yum-updateonboot-1.1.31-40.el7.noarch.rpm
yum-3.4.3-150.el7.centos.noarch.rpm          yum-utils-1.1.31-40.el7.noarch.rpm
yum-metadata-parser-1.1.4-10.el7.x86_64.rpm

7、安装软件包：

rpm -ivh yum-*

warning: yum-3.4.3-150.el7.centos.noarch.rpm: Header V3 RSA/SHA256 Signature, key ID f4a80eb5: NOKEY
error: Failed dependencies:
python-urlgrabber >= 3.10-8 is needed by yum-3.4.3-150.el7.centos.noarch

安装的python-urlgrabber版本不符合您尝试安装的RPM的依赖关系，yum源网站（网址：http://rpm.pbone.net/
）下载上面这五个较低版本的安装包，在来安装就不会有问题了

yum-3.4.3-132.el7.centos.0.1.noarch.rpm
yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
yum-plugin-fastestmirror-1.1.31-34.el7.noarch.rpm
yum-updateonboot-1.1.31-34.el7.noarch.rpm
yum-utils-1.1.31-34.el7.noarch.rpm

8、下载好后重新安装：

ls
yum-3.4.3-132.el7.centos.0.1.noarch.rpm            yum-updateonboot-1.1.31-34.el7.noarch.rpm
yum-metadata-parser-1.1.4-10.el7.x86_64.rpm        yum-utils-1.1.31-34.el7.noarch.rpm
yum-plugin-fastestmirror-1.1.31-34.el7.noarch.rpm
rpm -ivh yum-*warning: yum-3.4.3-132.el7.centos.0.1.noarch.rpm: Header V3 RSA/SHA256 Signature, key ID f4a80eb5: NOKEY
Preparing...                          ################################# [100%]
Updating / installing...
1:yum-metadata-parser-1.1.4-10.el7 ################################# [ 20%]
2:yum-plugin-fastestmirror-1.1.31-3################################# [ 40%]
3:yum-3.4.3-132.el7.centos.0.1    ################################# [ 60%]
4:yum-updateonboot-1.1.31-34.el7  ################################# [ 80%]
5:yum-utils-1.1.31-34.el7          ################################# [100%]

这次没有报错了，安装完成！！！
9、新建repo 配置文件；

vim /etc/yum.repos.d/CentOS-Base.repo
#CentOS-Base.repo
#
The mirror system uses the connecting IP address of the client and the
update status of each mirror to pick mirrors that are updated to and
geographically close to the client.  You should use this for CentOS updates
unless you are manually picking other mirrors.
#
If the mirrorlist= does not work for you, as a fall back you can try the
remarked out baseurl= line instead.
#
[base]
name=CentOS-$7 - Base - 163.com
#mirrorlist=http://mirrorlist.centos.org/?release=$7&arch=$basearch&repo=os
baseurl=http://mirrors.163.com/centos/7/os/$basearch/
gpgcheck=1
gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7
#released updates
[updates]
name=CentOS-$7 - Updates - 163.com
#mirrorlist=http://mirrorlist.centos.org/?release=$7&arch=$basearch&repo=updates
baseurl=http://mirrors.163.com/centos/7/updates/$basearch/
gpgcheck=1
gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7
#additional packages that may be useful
[extras]
name=CentOS-$7 - Extras - 163.com
#mirrorlist=http://mirrorlist.centos.org/?release=$7&arch=$basearch&repo=extras
baseurl=http://mirrors.163.com/centos/7/extras/$basearch/
gpgcheck=1
gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7
#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$7 - Plus - 163.com
baseurl=http://mirrors.163.com/centos/7/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7

10、清除缓存：

yum clean all

11、测试安装是否正常；

yum -y install lftp

不报错就安装成功

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