1、备份系统源
# cd /etc/yum.repos.d
# mv CentOS-Base.repo CentOS-Base.repo.bak
2、设置默认源为163
# wget http://mirrors.163.com/.help/CentOS6-Base-163.repo
# mv CentOS6-Base-163.repo CentOS-Base.repo
3、执行yum源更新
# yum clean all // 清除以前的缓存
# yum makecache // 重建缓存
# yum update
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