centos7.4yum错误

1. 首先删除redhat原有的yum

1.  
   rpm -aq | grep yum | xargs rpm -e --nodeps
2.  
   rpm -aq | grep python-iniparse | xargs rpm -e --nodeps

查看是否已经卸载完成：

1.  
   rpm -aq | grep yum
2.  
   rpm -aq | grep python-iniparse

2. 下载yum安装包

1.  wget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-3.4.3-154.el7.centos.noarch.rpm
2.  wget http://mirrors.163.com/centos/7/os/x86_64/Packages/python-iniparse-0.4-9.el7.noarch.rpm
3.  wget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
4.  wget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-42.el7.noarch.rpm
5. wget http://mirrors.163.com/centos/7/os/x86_64/RPM-GPG-KEY-CentOS-7

先安装python，在安装yum-metadata 最后两个yum一起安装。

3. 安装下载的rpm包

rpm -ivh python-iniparse-0.4-9.el7.noarch.rpm yum-metadata-parser-1.1.4-10.el7.x86_64.rpm yum-3.4.3-154.el7.centos.noarch.rpm yum-plugin-fastestmirror-1.1.31-42.el7.noarch.rpm

4. 创建文件/etc/yum.repos.d/CentOS-Base.repo

可以使用网易云或阿里云镜像站点：

网易云镜像：

[base]
name=CentOS-$releasever - Base
baseurl=http://mirrors.163.com/centos/7.4.1708/os/$basearch/
gpgcheck=
gpgkey=http://mirrors.163.com/centos/7.4.1708/os/x86_64/RPM-GPG-KEY-CentOS-7

#released updates
[updates]
name=CentOS-$releasever - Updates
baseurl=http://mirrors.163.com/centos/7.4.1708/updates/$basearch/
gpgcheck=
gpgkey=http://mirrors.163.com/centos/7.4.1708/os/x86_64/RPM-GPG-KEY-CentOS-7

[extras]
name=CentOS-$releasever - Extras
baseurl=http://mirrors.163.com/centos/7.4.1708/extras//$basearch/
gpgcheck=
gpgkey=http://mirrors.163.com/centos/7.4.1708/os/x86_64/RPM-GPG-KEY-CentOS-7

[centosplus]
name=CentOS-$releasever - Plus
baseurl=http://mirrors.163.com/centos/7.4.1708/centosplus//$basearch/
gpgcheck=
enabled=

阿里云镜像：

[base]
name=CentOS-$releasever - Base
baseurl=https://mirrors.aliyun.com/centos/7.4.1708/os/$basearch/
gpgcheck=
gpgkey=https://mirrors.aliyun.com/centos/7.4.1708/os/x86_64/RPM-GPG-KEY-CentOS-7

#released updates
[updates]
name=CentOS-$releasever - Updates
baseurl=https://mirrors.aliyun.com/centos/7.4.1708/updates/$basearch/
gpgcheck=
gpgkey=https://mirrors.aliyun.com/centos/7.4.1708/os/x86_64/RPM-GPG-KEY-CentOS-7

[extras]
name=CentOS-$releasever - Extras
baseurl=https://mirrors.aliyun.com/centos/7.4.1708/extras//$basearch/
gpgcheck=
gpgkey=https://mirrors.aliyun.com/centos/7.4.1708/os/x86_64/RPM-GPG-KEY-CentOS-7

[centosplus]
name=CentOS-$releasever - Plus
baseurl=https://mirrors.aliyun.com/centos/7.4.1708/centosplus//$basearch/
gpgcheck=
enabled=

5. yum clean all

6. yum makecache（生成本地缓存）

附：yum源变更说明

经查从2018年05月24日起阿里云和网易云镜像站点中对于CentOS 7.4.1708版本的yum源已经不做支持，在镜像站点中附带了一个readme文件说明如下：

解决该站点镜像无法使用的方式有如下两种：

方式一：将上述第4点中所有的7.4.1708替换为7

方式二：将上述第4点中所有的mirrors.163.com或mirrors.aliyun.com替换为vault.centos.org

yum update出现：