centos 7更换升级内核

安装elrepo，升级内核

1 2	yum install https://www.elrepo.org/elrepo-release-7.el7.elrepo.noarch.rpm yum --enablerepo=elrepo-kernel install kernel-ml -y

查看启动顺序

1	egrep ^menuentry /etc/grub2.cfg \| cut -f 2 -d \'

设置启动顺序并重启

1 2	grub2-set-default 0 reboot