1. 查看當前默認啟動內核

[root@localhost yangkun]# grub2-editenv list

saved_entry=CentOS Linux, with Linux 3.10.0-123.el7.x86_64

2. 羅列所有內核

[root@localhost yangkun]# cat /boot/grub2/grub.cfg | grep menuentry

if [ x"${feature_menuentry_id}" = xy ]; then

menuentry_id_option="--id"

menuentry_id_option=""

export menuentry_id_option

menuentry 'CentOS Linux (3.10.107) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-123.el7.x86_64-advanced-c2673a5b-1cf0-4c66-b8ce-a0aec9370bf5' {

menuentry 'CentOS Linux, with Linux 3.10.0-123.el7.x86_64' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-123.el7.x86_64-advanced-c2673a5b-1cf0-4c66-b8ce-a0aec9370bf5' {

menuentry 'CentOS Linux, with Linux 0-rescue-c4cebf4178d142359e5eeab989f93561' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-0-rescue-c4cebf4178d142359e5eeab989f93561-advanced-c2673a5b-1cf0-4c66-b8ce-a0aec9370bf5' {

3. 設置默認啟動內核

[root@localhost yangkun]# grub2-set-default 'CentOS Linux (3.10.107) 7 (Core)'

4. 確認改動的結果

[root@localhost yangkun]# grub2-editenv list

saved_entry=CentOS Linux (3.10.107) 7 (Core)

5. ?重啟系統

reboot

uname -a

總結

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