https://qiita.com/hana_shin/items/5714158a8a777654ca65
# grubby --info=ALL
kernel選択例
# grubby --set-default-index=1
めも
timeout変更
vi /etc/default/grub
https://qiita.com/hana_shin/items/5714158a8a777654ca65
# grubby --info=ALL
kernel選択例
# grubby --set-default-index=1
めも
timeout変更
vi /etc/default/grub