centos 内核更新到5.4

cat >update-kernel.sh <<EOF
#!/bin/bash
sudo yum install -y https://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm
sudo yum info --enablerepo=elrepo-kernel kernel-lt kernel-ml
sudo yum install --skip-broken --enablerepo=elrepo-kernel -y kernel-lt kernel-lt-headers

#把刚安装的内核加载到系统
sudo grub2-mkconfig -o /boot/grub2/grub.cfg

#查看可用内核
sudo awk -F\‘ ‘=="menuentry " {print i++ " : " }‘ /etc/grub2.cfg

#设置启动内核
sudo grub2-set-default 0

#重启生效
echo 3 mini is reboot ... && sleep 3
reboot
EOF