1、首先查看redhat 7.0系统本身所安装的那些yum 软件包：

[root@linuxprobe~]#rpm-qa|grepyumyum-utils-1.1.31-24.el7.noarchyum-langpacks-0.4.2-3.el7.noarchyum-metadata-parser-1.1.4-10.el7.x86_64yum-rhn-plugin-2.0.1-4.el7.noarchPackageKit-yum-0.8.9-11.el7.x86_64yum-3.4.3-118.el7.noarch

2、卸载这些软件包；

[root@linuxprobe~]#rpm-eyum-3.4.3-118.el7.noarch--nodeps[root@linuxprobe~]#rpm-eyum-utils-1.1.31-24.el7.noarch--nodeps[root@linuxprobe~]#rpm-eyum-rhn-plugin-2.0.1-4.el7.noarch--nodeps[root@linuxprobe~]#rpm-eyum-metadata-parser-1.1.4-10.el7.x86_64--nodeps[root@linuxprobe~]#rpm-eyum-langpacks-0.4.2-3.el7.noarch--nodeps[root@linuxprobe~]#rpm-ePackageKit-yum-0.8.9-11.el7.x86_64--nodeps

3、保证本机电脑能上网；

[root@linuxprobe~]#pingwww.baidu.comPINGwww.a.shifen.com(61.135.169.121)56(84)bytesofdata.64bytesfrom61.135.169.121:icmp_seq=1ttl=53time=31.8ms64bytesfrom61.135.169.121:icmp_seq=2ttl=53time=31.9ms64bytesfrom61.135.169.121:icmp_seq=3ttl=53time=32.0ms

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；

网易163网络源地址：http://mirrors.163.com/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：

[root@Linuxprobe~]#wgethttp://mirrors.163.com/centos/7/os/x86_64/Packages/yum-3.4.3-118.el7.centos.noarch.rpm--2016-01-1720:43:15--http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-3.4.3-118.el7.centos.noarch.rpmResolvingmirrors.163.com(mirrors.163.com)...123.58.173.185,123.58.173.186Connectingtomirrors.163.com(mirrors.163.com)|123.58.173.185|:80...connected.HTTPrequestsent,awaitingresponse...404NotFound2016-01-1720:43:15ERROR404:NotFound.//如果找不到，是安装包更新了，你可以到这个网站http://mirrors.163.com/centos/7/os/x86_64/Packages/复制下载链接，然后再下载下来；[root@linuxprobe~]#wgethttp://mirrors.163.com/centos/7/os/x86_64/Packages/yum-3.4.3-132.el7.centos.0.1.noarch.rpm[root@linuxprobe~]#wgethttp://mirrors.163.com/centos/7/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpm[root@linuxprobe~]#wgethttp://mirrors.163.com/centos/7/os/x86_64/Packages/yum-utils-1.1.31-34.el7.noarch.rpm[root@linuxprobe~]#wgethttp://mirrors.163.com/centos/7/os/x86_64/Packages/yum-updateonboot-1.1.31-34.el7.noarch.rpm[root@linuxprobe~]#wgethttp://mirrors.163.com/centos/7/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-34.el7.noarch.rpm

6、查看下载完成结果；

[root@linuxprobe~]#lsyum-3.4.3-132.el7.centos.0.1.noarch.rpmyum-metadata-parser-1.1.4-10.el7.x86_64.rpmyum-plugin-fastestmirror-1.1.31-34.el7.noarch.rpmyum-updateonboot-1.1.31-34.el7.noarch.rpmyum-utils-1.1.31-34.el7.noarch.rpm

7、安装软件包：

[root@Linuxprobe~]#rpm-ivhyum-*warning:yum-3.4.3-132.el7.centos.0.1.noarch.rpm:HeaderV3RSA/SHA256Signature,keyIDf4a80eb5:NOKEYPreparing...#################################[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%]

8、新建repo 配置文件；

[root@linuxprobe~]#vim/etc/yum.repos.d/CentOS-Base.repo#CentOS-Base.repo##ThemirrorsystemusestheconnectingIPaddressoftheclientandthe#updatestatusofeachmirrortopickmirrorsthatareupdatedtoand#geographicallyclosetotheclient.YoushouldusethisforCentOSupdates#unlessyouaremanuallypickingothermirrors.##Ifthemirrorlist=doesnotworkforyou,asafallbackyoucantrythe#remarkedoutbaseurl=lineinstead.##[base]name=CentOS-$7-Base-163.com#mirrorlist=http://mirrorlist.centos.org/?release=$7&arch=$basearch&repo=osbaseurl=http://mirrors.163.com/centos/7/os/$basearch/gpgcheck=1gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7#releasedupdates[updates]name=CentOS-$7-Updates-163.com#mirrorlist=http://mirrorlist.centos.org/?release=$7&arch=$basearch&repo=updatesbaseurl=http://mirrors.163.com/centos/7/updates/$basearch/gpgcheck=1gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7#additionalpackagesthatmaybeuseful[extras]name=CentOS-$7-Extras-163.com#mirrorlist=http://mirrorlist.centos.org/?release=$7&arch=$basearch&repo=extrasbaseurl=http://mirrors.163.com/centos/7/extras/$basearch/gpgcheck=1gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7#additionalpackagesthatextendfunctionalityofexistingpackages[centosplus]name=CentOS-$7-Plus-163.combaseurl=http://mirrors.163.com/centos/7/centosplus/$basearch/gpgcheck=1enabled=0gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7

9、至此YUM 网络源已经安装完成；

[root@linuxprobe~]#yumcleanall

10、测试安装是否正常；

[root@Linuxprobe~]#yum-yinstalllftpLoadedplugins:fastestmirror,product-id,subscription-managerThissystemisnotregisteredtoRedHatSubscriptionManagement.Youcanusesubscription-managertoregister.LoadingmirrorspeedsfromcachedhostfileResolvingDependencies-->Runningtransactioncheck--->Packagelftp.x86_640:4.4.8-7.el7willbeinstalled-->FinishedDependencyResolutionDependenciesResolved================================================================================================PackageArchVersionRepositorySize================================================================================================Installing:lftpx86_644.4.8-7.el7base750kTransactionSummary================================================================================================Install1Package………………省略部分安装过程………………Installed:lftp.x86_640:4.4.8-7.el7Complete!

到这里安装完成，以后安装所需包，可以不用本地yum源了，直接使用网络yum源。