centos7 设置启动内核

1. 首先查看当前系统有几个内核

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

1. 设置默认的启动内核

grub2-set-default 'CentOS Linux (4.18.3-1.el7.elrepo.x86_64) 7 (Core)'

1. 验证是否修改成功

grub2-editenv list

1. 卸载多余内核

rpm -qa | grep kernel
yum remove