报错问题展示：[root@NISEC-6601 yum]# yum clean all

bash: yum: 未找到命令...

或者

无法使用YUM源的问题如下：

[root@localhost ~]# yum repolist

已加载插件：product-id, search-disabled-repos, subscription-manager

This system is not registered with an entitlement server. You can use subscription-manager to register.

repolist: 0

[root@localhost ~]#

[root@localhost ~]#

[root@localhost ~]# yum install ntp

已加载插件：product-id, search-disabled-repos, subscription-manager

This system is not registered with an entitlement server. You can use subscription-manager to register.

There are no enabled repos.

 Run "yum repolist all" to see the repos you have.

 To enable Red Hat Subscription Management repositories:

     subscription-manager repos --enable <repo>

 To enable custom repositories:

     yum-config-manager --enable <repo>

 

解决方法：

1.# 清除原有RHEL的YUM及相关软件包

rpm -qa|grep yum|xargs rpm -e --nodeps

rpm -qa|grep python-urlgrabber|xargs rpm -e --nodeps

2.# 软件包下载地址

# https://mirrors.aliyun.com/centos/7/os/x86_64/Packages/

# http://mirrors.163.com/centos/7/os/x86_64/Packages/

 

下载centos7的相关软件包

http://mirrors.163.com/centos/7/os/x86_64/Packages/rpm-4.11.3-45.el7.x86_64.rpm

http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-3.4.3-168.el7.centos.noarch.rpm

http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpm

http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-54.el7_8.noarch.rpm

http://mirrors.163.com/centos/7/os/x86_64/Packages/python-iniparse-0.4-9.el7.noarch.rpm

http://mirrors.163.com/centos/7/os/x86_64/Packages/python-urlgrabber-3.10-10.el7.noarch.rpm

上传软件包到rhel7.3系统里

 

安装软件包

注：yum-plugin-fastestmirror和yum两个rpm要一起安装，不能拆开。

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

rpm -ivh python-urlgrabber-3.10-10.el7.noarch.rpm

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

rpm -ivh yum-plugin-fastestmirror-1.1.31-54.el7_8.noarch.rpm yum-3.4.3-168.el7.centos.noarch.rpm 

 

问题1

错误：依赖检测失败：    

    rpm >= 0:4.11.3-22 被 yum-3.4.3-158.el7.centos.noarch 需要

    yum >= 3.0 被 yum-plugin-fastestmirror-1.1.31-54.el7_8.noarch 需要 

解决：,升级rpm，上一步已经下载了，直接升级

rpm -Uvh rpm-4.11.3-45.el7.x86_64.rpm --nodeps

 

下载配置文件

wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo

vi  CentOS-Base.repo  //编辑文件

把文件中所有$releasever改为7，$basearch保持不变

然后将此配置文件上传并复制到/etc/yum.repos.d/路径下，删除redhat.repo文件

[root@localhost etc]# cd yum.repos.d

[root@localhost yum.repos.d]# ls

CentOS-Base.repo redhat.repo

[root@localhost yum.repos.d]# rm redhat.repo

rm：是否删除普通文件 "redhat.repo"？y

[root@localhost yum.repos.d]# ls

CentOS-Base.repo

[root@localhost yum.repos.d]# vi CentOS-Base.repo

[root@localhost yum.repos.d]# yum clean all

1、$releasever

$releasever的值，当前系统的发行版本。是指大版本7

2、$basearch

$basearch的值，系统硬件架构(CPU指令集)

查看命令：arch，结果是x86_64

 

删除/var/cache/yum/下的x86_64目录

[root@localhost yum.repos.d]# cd /var/cache/yum/

[root@localhost yum]# ls

x86_64

[root@localhost yum]# rm -rf x86_64

[root@localhost yum]# ls

 

清理yum缓存: yum clean all

将服务器软件包信息缓存至本地，提高搜索安装效率：yum makecache

 

测试：

能搜索到软件包信息，说明配置完成：

yum search vim

执行yum repolist查看，如果显示出repo仓库列表，并显示软件包数量则OK。（或者使用yum makecache）：

yum repolist

使用yum安装软件包测试：

yum -y install vim