添加 elrepo 源

rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
rpm -Uvh https://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm

安装 Kernel

yum --enablerepo=elrepo-kernel install kernel-ml

查看启动项

cat /boot/grub2/grub.cfg | grep menuentry

设默认启动项

grub2-set-default 'CentOS Linux (4.19.8-1.el7.elrepo.x86_64) 7 (Core)'

重启

reboot

移除老旧内核

yum remove -y  kernel-3.10.0-957.el7.x86_64