内核升级

cd /data/yunli/rpms/system_rpm
sudo yum install -y kernel-lt-4.4.248-1.el7.elrepo.x86_64
sudo awk -F' '$1=="menuentry " {print i++ " : " $2}' /etc/grub2.cfg
sudo grub2-set-default 0
sudo grub2-mkconfig -o /boot/grub2/grub.cfg
sudo reboot