1.7. Setting a kernel as default

Procedure

• Setting the kernel as default by using the grubby tool.

  • Enter the following command to set the kernel as default using the grubby tool:

    # grubby --set-default $kernel_path

• Setting the kernel as default by using the version argument.

  • List the boot entries using the kernel keyword and then set an intended kernel as default:

    # select k in /boot/vmlinuz-*; do grubby --set-default=$k; break; done

    注意

    To list the boot entries using the title argument, enter # grubby --info=ALL | grep title.

• Setting the default kernel for only the next boot.

  • Enter the following command to set the default kernel for only the next reboot using the grub2-reboot command:

    # grub2-reboot <index|title|id>

    警告

    Set the default kernel for only the next boot with care. Installing new kernel RPMs, self-built kernels, and manually adding the entries to the /boot/loader/entries/ directory might change the index values.