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Summary

  • The RHEL 8 boot process flow and the purpose of the GRUB2 bootloader.

  • The grubby command manipulates bootloader configuration files.

  • The efibootmgr command manages the boot order and boot targets on UEFI systems.

  • The systemctl list-dependencies and systemd-analyze commands show a systemd unit's dependencies.

  • The debug-shell service grants early root access to a system as it boots.

  • The root user's password is reset by adding rd.break to the kernel options at boot.

Revision: rh342-8.4-6dd89bd