CentOS默认yum源调整

   CentOS默认的yum源不一定是国内镜像，导致yum在线安装及更新速度不是很理想。这时就需要将yum源设置为国内镜像站点。国内主要开源的开源镜像站点首推还是网易和阿里云。

1 更新yum源为mirrors.163.com

1.1 备份默认yum源

mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.$(date +%F).backup

1.2 下载网易yum源

# 进入yum源配置目录
cd /etc/yum.repos.d/

# 根据不同的系统，选择相应的yum源
# CentOS7
wget http://mirrors.163.com/.help/CentOS7-Base-163.repo

# CentOS6
wget http://mirrors.163.com/.help/CentOS6-Base-163.repo

# CentOS5
wget http://mirrors.163.com/.help/CentOS5-Base-163.repo

1.3 生成缓存

yum makecache

1.4 更新yum

yum -y update

已加载插件：fastestmirror, refresh-packagekit, security
设置更新进程Loading mirror speeds from cached hostfile
* base: mirrors.163.com
* extras: mirrors.163.com
* updates: mirrors.163.com

2 更新yum源为mirrors.aliyun.com

2.1 备份默认yum源

mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.$(date +%F).backup

2.2 下载阿里云yum源

# 进入yum源配置目录
cd /etc/yum.repos.d/

# 根据不同的系统，选择相应的yum源
# CentOS7
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

# CentOS6
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo

# CentOS5
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-5.repo

2.3 生成缓存

yum makecache

2.4 更新yum源

yum -y update

已加载插件：fastestmirror, refresh-packagekit, security
设置更新进程Loading mirror speeds from cached hostfile
* base: mirrors.aliyun.com
* extras: mirrors.aliyun.com
* updates: mirrors.aliyun.com