CentOS7更换内核
rpm -ivh http://file.asuhu.com/kernel/kernel-3.10.0-229.1.2.el7.x86_64.rpm --force
查看内核
awk -F\' '$1=="menuentry " {print i++ " : " $2}' /etc/grub2.cfg
0 : CentOS Linux 7 Rescue 1f0eb10f866e4eeea5ec2c016d383869 (3.10.0-229.1.2.el7.x86_64)
1 : CentOS Linux (3.10.0-229.1.2.el7.x86_64) 7 (Core)
2 : CentOS Linux (3.10.0-514.2.2.el7.x86_64) 7 (Core)
3 : CentOS Linux (0-rescue-98f15324ee1542fdaf9b60c933ff0e2c) 7 (Core)

设置启动的内核 grub2-set-default `awk -F\' '$1=="menuentry " {print i++ " : " $2}' /etc/grub2.cfg | grep '(3.10.0-229.1.2.el7.x86_64) 7 (Core)'|awk '{print $1}'`
grub2-editenv list #查看确认
reboot 重启
更换完内核就直接上锐速脚本
wget https://raw.githubusercontent.com/91yun/serverspeeder/master/serverspeeder-all.sh && bash serverspeeder-all.sh
坐等安装完成