Red hat安裝yum源
RedHat yum源是收費(fèi)的，沒(méi)有注冊(cè)的Redhat機(jī)器是不能使用yum源的。
所以需要自己手動(dòng)更改成CentOS 的更新包，CentOS幾乎和RedHat是一樣的，所以無(wú)需擔(dān)心軟件包是否可安裝，下面是安裝步驟。
查看RHEL是否安裝了yum，若是安裝了，那么又有哪些yum包：
[root@localhost ~]# rpm -qa |grep yum
yum-rhn-plugin-2.0.1-4.el7.noarch
yum-metadata-parser-1.1.4-10.el7.x86_64
yum-3.4.3-118.el7.noarch
刪除redhat自帶的yum包
這里用腳本代替，yum.sh
#! /bin/sh
rpm -qa |grep yum
rpm -qa|grep yum|xargs rpm -e --nodeps ##（不檢查依賴，直接刪除rpm包）
rpm -qa |grep yum ##(再次查看)
下載新的yum軟件包
一般可以進(jìn)入以下網(wǎng)站上面查看軟件包的版本是否升級(jí)或者找到自己系統(tǒng)所對(duì)應(yīng)的文件包版本更新；
網(wǎng)易163網(wǎng)絡(luò)源地址：http://mirrors.163.com/centos/
CentOS網(wǎng)絡(luò)源地址：http://centos.ustc.edu.cn/centos/
找到自己所需要的版本下載：
Wget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-3.4.3-163.el7.centos.noarch.rpm
//如果找不到，是安裝包更新了，你可以到這個(gè)網(wǎng)站http://mirrors.163.com/centos/7/os/x86_64/Packages/復(fù)制下載鏈接，然后再下載下來(lái)；
下載并安裝，我在home目錄下創(chuàng)建了腳本yum.sh，下載并安裝這些軟件包
#!? /bin/sh
wget? http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-3.4.3-163.el7.centos.noarch.rpm
wget? http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-NetworkManager-dispatcher-1.1.31-52.el7.noarch.rpm
wget? http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-cron-3.4.3-163.el7.centos.noarch.rpm
wget? http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-langpacks-0.4.2-7.el7.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-plugin-auto-update-debug-info-1.1.31-52.el7.noarch.rpm
wget? http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-plugin-changelog-1.1.31-52.el7.noarch.rpm
wget? http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-plugin-copr-1.1.31-52.el7.noarch.rpm
wget? http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-52.el7.noarch.rpm
wget? http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-plugin-filter-data-1.1.31-52.el7.noarch.rpm
wget? http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-plugin-fs-snapshot-1.1.31-52.el7.noarch.rpm
wget? http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-plugin-keys-1.1.31-52.el7.noarch.rpm
wget? http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-plugin-list-data-1.1.31-52.el7.noarch.rpm
wget? http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-plugin-local-1.1.31-52.el7.noarch.rpm
wget? http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-plugin-merge-conf-1.1.31-52.el7.noarch.rpm
wget? http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-plugin-ovl-1.1.31-52.el7.noarch.rpm
wget? http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-plugin-post-transaction-actions-1.1.31-52.el7.noarch.rpm
wget? http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-plugin-pre-transaction-actions-1.1.31-52.el7.noarch.rpm
wget? http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-plugin-priorities-1.1.31-52.el7.noarch.rpm
wget? http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-plugin-protectbase-1.1.31-52.el7.noarch.rpm
wget? http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-plugin-ps-1.1.31-52.el7.noarch.rpm
wget? http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-plugin-remove-with-leaves-1.1.31-52.el7.noarch.rpm
wget? http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-plugin-rpm-warm-cache-1.1.31-52.el7.noarch.rpm
wget? http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-plugin-show-leaves-1.1.31-52.el7.noarch.rpm
wget? http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-plugin-tmprepo-1.1.31-52.el7.noarch.rpm
wget? http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-plugin-tsflags-1.1.31-52.el7.noarch.rpm
wget? http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-plugin-upgrade-helper-1.1.31-52.el7.noarch.rpm
wget? http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-plugin-verify-1.1.31-52.el7.noarch.rpm
wget? http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-plugin-versionlock-1.1.31-52.el7.noarch.rpm
wget? http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-rhn-plugin-2.0.1-10.el7.noarch.rpm
wget? http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-updateonboot-1.1.31-52.el7.noarch.rpm
wget? http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-utils-1.1.31-52.el7.noarch.rpm
ls
rpm -ivh yum-* ##單個(gè)的安裝包可能會(huì)依賴其它包（例如yum和yum-fastestmirror會(huì)相互依賴），所以我們可以把所有這些包放在一起，用一行命令將它們同時(shí)安裝即可
echo? ok
新建repo 配置文件
[root@localhostyum.repos.d]# vi /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
運(yùn)行yum makecache命令生成緩存
[root@localhost yum.repos.d]# yum clean all
[root@localhost yum.repos.d]# yum makecache
[root@localhostyum.repos.d]# yum update
經(jīng)過(guò)上述六個(gè)步驟，新的yum源已經(jīng)安裝完成了，我們可以用yum install 命令來(lái)測(cè)試安裝是否正常
[root@localhostyum.repos.d]# yum install net-tools
