下载CentOS6.5系统源

http://mirror.nsc.liu.se/centos-store/6.5/isos/x86_64/CentOS-6.5-x86_64-bin-DVD1.iso

下载CentOS6.5系统的yum组件

http://mirror.nsc.liu.se/centos-store/6.5/os/x86_64/Packages/yum-3.2.29-40.el6.centos.noarch.rpm
http://mirror.nsc.liu.se/centos-store/6.5/os/x86_64/Packages/yum-metadata-parser-1.1.2-16.el6.x86_64.rpm
http://mirror.nsc.liu.se/centos-store/6.5/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.30-14.el6.noarch.rpm
http://mirror.nsc.liu.se/centos-store/6.5/os/x86_64/Packages/yum-plugin-upgrade-helper-1.1.30-14.el6.noarch.rpm
http://mirror.nsc.liu.se/centos-store/6.5/os/x86_64/Packages/yum-utils-1.1.30-14.el6.noarch.rpm

下载CentOS6.5系统rpm备用

http://mirror.nsc.liu.se/centos-store/6.5/os/x86_64/RPM-GPG-KEY-CentOS-6
http://mirror.nsc.liu.se/centos-store/6.5/os/x86_64/RPM-GPG-KEY-CentOS-Debug-6
http://mirror.nsc.liu.se/centos-store/6.5/os/x86_64/RPM-GPG-KEY-CentOS-Security-6
http://mirror.nsc.liu.se/centos-store/6.5/os/x86_64/RPM-GPG-KEY-CentOS-Testing-6

将下载的全部传到需替换的服务器上

替换原redhat源

1. 查看系统自身安装的yum软件包

rpm -qa | grep yum 

2. 卸载所有自带yum软件包

rpm -e 软件包名称 --nodeps 

3. 删除所有repo相关文件

rm -rf /etc/yum.conf rm -rf /etc/yum.repos.d/ rm -rf /var/cache/yum 

4.安装下载的所有yum相关组件

rpm -ivh yum-* 

5.准备配置本地源

配置本地源

1. 创建文件夹

mkdir /mnt/cdrom 

2. 挂载iso镜像文件到/mnt/cdrom节点下

mount -o loop /usr/local/CentOS-6.5-x86_64-bin-DVD1.iso /mnt/cdrom 

3. 编辑.repo文件

# 进入到/etc/yum.repos.d/ 文件夹 cd /etc/yum.repos.d/ # 移除该文件夹下的所有后缀为.repo的文件 mv *.repo /tmp # 创建自己的.repo文件，内容如下，保存退出！ # vim local.repo  ''' [local_server]   #库名称 name=Thisis a local repo  #名称描述  baseurl=file:///mnt/cdrom  #yum源目录，源地址 enabled=1     #是否启用该yum源，0为禁用 gpgcheck=1    #检查GPG-KEY，0为不检查，1为检查  gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6  #gpgcheck=0时无需配置 ''' 

4. 清除缓存

yum clean all  ''' Loaded plugins: fastestmirror, refresh-packagekit, security Cleaning repos: local_server Cleaning up Everything Cleaning up list of fastest mirrors ''' 

5. 建立新缓存

yum makecache ''' Loaded plugins: fastestmirror, refresh-packagekit, security Determining fastest mirrors local_server                                             |4.0 kB     00:00 ... local_server/group_gz                                    | 209kB     00:00 ... local_server/filelists_db                                | 4.8 MB     00:00 ... local_server/primary_db                                  | 3.5 MB     00:00 ... local_server/other_db                                    | 2.0MB     00:00 ... Metadata Cache Created ''' 

6. yum本地源安装完成

yum list 

更换系统

1. 卸载系统镜像

rpm -e redhat-release-server-6.5-18.el7.x86_64 --nodeps 

2. 更新yum

yum update -y 

3. 重启操作系统

reboot 

4. 验证

cat /etc/redhat-release # 若找不到此文件，查找是否有/etc/centos-release文件 # 若有，则执行 ln -s centos-release redhat-release # 若无，创建centos-release vi centos-release ''' 写入当前系统版本号 ''' # 保存退出，并执行 ln -s centos-release redhat-release