grub2修改启动顺序

1. 查看所有的entry

   [root@dpdk grub2]# awk -F \' '$1=="menuentry " {print i++ " : " $2}' /etc/grub2.cfg
   0 : CentOS Linux (3.10.0-693.11.1.el7.x86_64) 7 (Core)
   1 : CentOS Linux (3.10.0-693.5.2.el7.x86_64) 7 (Core)
   2 : CentOS Linux (3.10.0-693.2.2.el7.x86_64) 7 (Core)
   3 : CentOS Linux (0-rescue-37138ca794604b28bca5b6394f5cd3c2) 7 (Core)
   

2. 查看当前default的entry

   [root@dpdk grub2]# grub2-editenv list
   saved_entry=CentOS Linux (3.10.0-693.11.1.el7.x86_64) 7 (Core)
   [root@dpdk grub2]#
   

3. 修改为指定的entry

   [root@dpdk grub2]# grub2-set-default 2
   [root@dpdk grub2]# grub2-editenv list
   saved_entry=2
   [root@dpdk grub2]#