由於在安裝Redhat7 想安裝gcc   使用yum   install gcc  報錯：

This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.

大概意思是讓先註冊一下，這是redhat 自帶的yum需要註冊。

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第一步：先解除安裝原來的yum

[[email protected] ~]# rpm -qa |grep yum  （檢視原來是否安裝

[[email protected] ~]# rpm -qa|grep yum|xargs rpm -e  –-nodeps （直接解除安裝）

第二步：下載替換包

新建目錄 mkdir  /home/yum     (上傳到這裡yum下面)

執行： rpm -ivh *.rpm  一次性安裝依賴包。

[[email protected] yum]# rpm -ivh *.rpm

第三步 ： 新建配置檔案  1.repo  

 （home/yum/1.repo

  vim  1.repo

第四步： 把下面的配置檔案複製到 1.repo 裡邊

#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

第五步：清楚快取

[[email protected] yum.repos.d]# yum cear all

[[email protected] yum.repos.d]# yum makecache

既yum配置完成。