yum下载对应内核版本的kernel-devel

1 查看内核版本 uname -r

2 查看目前已有的kernel-devel 

 uname -a ; rpm -qa kernel* | sort

3 下载对应版本

$ sudo yum install "kernel-devel-uname-r == $(uname -r)"

#安装成功会在/usr/src/kernel/下生成对应$(uname -r)目录

将Centos的yum源更换为国内的阿里云源

1、备份

mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup

2、下载新的CentOS-Base.repo 到/etc/yum.repos.d/

CentOS 5

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

 CentOS 6

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

CentOS 7

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

3、之后运行yum makecache生成缓存