yum 源可以配到国内的镜像来加速 阿里云，网易，搜狐都可以
这里给个阿里云的说明 http://mirrors.aliyun.com/hel...
先升级 CentOS 到 6.8 Final
- yum update
先导入公钥
- rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
导入源
- rpm -Uvh http://www.elrepo.org/elrepo-release-6-6.el6.elrepo.noarch.rpm
然后可以选择安装最新版内核，或者稳定版内核
最新版
- yum –enablerepo=elrepo-kernel install -y kernel-ml
稳定版
- yum --enablerepo=elrepo-kernel install kernel-lt -y
最后编辑 /etc/grub.conf 启动文件
- # grub.conf generated by anaconda
- #
- # Note that you do not have to rerun grub after making changes to this file
- # NOTICE: You do not have a /boot partition. This means that
- # all kernel and initrd paths are relative to /,eg.
- # root (hd0,0)
- # kernel /boot/vmlinuz-version ro root=/dev/sda1
- # initrd /boot/initrd-[generic-]version.img
- #boot=/dev/sda
- default=0
- timeout=5
- splashimage=(hd0,0)/boot/grub/splash.xpm.gz
- hiddenmenu
- title CentOS (3.10.104-1.el6.elrepo.x86_64)
- root (hd0,0)
- kernel /boot/vmlinuz-3.10.104-1.el6.elrepo.x86_64 ro root=UUID=e70a0f35-5468-435d-b625-5924aee0a8ad rd_NO_LUKS KEYBOARDTYPE=pc KEYTABLE=us rd_NO_MD crashkernel=auto LANG=zh_CN.UTF-8 rd_NO_LVM rd_NO_DM rhgb quiet
- initrd /boot/initramfs-3.10.104-1.el6.elrepo.x86_64.img
- title CentOS (2.6.32-642.11.1.el6.x86_64)
- root (hd0,0)
- kernel /boot/vmlinuz-2.6.32-642.11.1.el6.x86_64 ro root=UUID=e70a0f35-5468-435d-b625-5924aee0a8ad rd_NO_LUKS KEYBOARDTYPE=pc KEYTABLE=us rd_NO_MD crashkernel=auto LANG=zh_CN.UTF-8 rd_NO_LVM rd_NO_DM rhgb quiet
- initrd /boot/initramfs-2.6.32-642.11.1.el6.x86_64.img
- title CentOS (2.6.32-358.el6.x86_64)
- root (hd0,0)
- kernel /boot/vmlinuz-2.6.32-358.el6.x86_64 ro root=UUID=e70a0f35-5468-435d-b625-5924aee0a8ad rd_NO_LUKS KEYBOARDTYPE=pc KEYTABLE=us rd_NO_MD crashkernel=auto LANG=zh_CN.UTF-8 rd_NO_LVM rd_NO_DM rhgb quiet
- initrd /boot/initramfs-2.6.32-358.el6.x86_64.img
title顺序从上往下 0，1，2
默认新装的应该排在最上面
所以把default值改成0
然后重启
查看版本信息
- #cat /etc/redhat-release
- CentOS release 6.8 (Final)
- # uname -r
- 3.10.104-1.el6.elrepo.x86_64
搞定
