grub的配置文件放在：/etc/default/grub文件中，修改其中的内容：
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# 默认启动的系统序号，显示在开机界面的，从0开始 GRUB_DEFAULT=2 #GRUB_HIDDEN_TIMEOUT=0 GRUB_HIDDEN_TIMEOUT_QUIET=true # grub页面选择等待的超时时间 GRUB_TIMEOUT=5 GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian` GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" GRUB_CMDLINE_LINUX="" |
修改完成后更新grub配置：
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> sudo update-grub Generating grub configuration file ... Found linux image: /boot/vmlinuz-4.15.0-36-generic Found initrd image: /boot/initrd.img-4.15.0-36-generic Found linux image: /boot/vmlinuz-4.15.0-34-generic Found initrd image: /boot/initrd.img-4.15.0-34-generic Found CentOS release 6.9 (Final) on /dev/sdb4 Adding boot menu entry for EFI firmware configuration done |
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