替换linux系统yum源
在下载yum文件慢的情况下，可以更换DNS或更换yum源1、备份系统旧配置文件mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup2、获取对应版本的CentOS-Base.repo 到/etc/yum.repos.d/目录
替换之前先备份旧配置mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backupcentos各版本的源配置列表
centos5wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.cloud.tencent.com/repo/centos5_base.repocentos6wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.cloud.tencent.com/repo/centos6_base.repocentos7（腾讯yum源）wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.cloud.tencent.com/repo/centos7_base.repo
（阿里云yum源）
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo更新缓存yum clean all
yum makecache
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