cenos 更新yum源为aliyun源

1、#查看已有源

$ ls -a /etc/yum.repos.d/
.  ..  CentOS-Base.repo  CentOS-Debuginfo.repo  CentOS-fasttrack.repo  CentOS-Media.repo  CentOS-Vault.repo  epel.repo  yz.repo

2、#备份已有的源

$mv /etc/yum.repos.d  /etc/yum.repos.d.backup 

3、 #重建源目录

$mkdir /etc/yum.repos.d

4、

$wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

5、 #清理

$yum clean all

6、#重建本地缓存

$yum makecache

ps：看到下面的脚本忍不住要吐槽下，

modify_aliyun5_yum()

{

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

  sed -i 's/\$releasever/5/' /etc/yum.repos.d/CentOS-Base.repo

  wget -qO /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-5.repo

  yum clean metadata

  yum makecache

  cd ~

}

modify_rhel5_yum()

{

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

  wget -qO /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-5.repo

  yum clean metadata

  yum makecache

  cd ~

}

modify_rhel6_yum()

{

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

  wget -qO /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-6.repo

  yum clean metadata

  yum makecache

  cd ~

}

modify_rhel7_yum()

{

  wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

  wget -qO /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo

  yum clean metadata

  yum makecache

  cd ~

}