瓦工centos7镜像更换内核

dc8高峰期有点炸，准备换个内核上加速。

rpm -ivh https://buildlogs.centos.org/c7.1611.u/kernel/20161207134106/3.10.0-514.2.2.el7.x86_64/kernel-3.10.0-514.2.2.el7.x86_64.rpm --force

查看所有的entry

awk -F\' '$1=="menuentry " {print i++ " : " $2}' /etc/grub2.cfg

查看当前default的entry

grub2-editenv list

改为指定entry

grub2-set-default 1

重启

reboot

[root@us-cn2 ~]# uname -r
3.10.0-514.2.2.el7.x86_64