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202.2 - System Recovery

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Description: Candidates should be able to properly manipulate a Linux system during both the boot process and during recovery mode. This objective includes using both the init utility and init-related kernel options. Candidates should be able to determine the cause of errors in loading and usage of bootloaders. GRUB version 2 and GRUB Legacy are the bootloaders of interest. Both BIOS and UEFI systems are covered.

Key Knowledge Areas:

  • BIOS and UEFI
  • NVMe booting
  • GRUB version 2 and Legacy
  • grub shell
  • boot loader start and hand off to kernel
  • kernel loading
  • hardware initialisation and setup
  • daemon/service initialisation and setup
  • Know the different boot loader install locations on a hard disk or removable device.
  • Overwrite standard boot loader options and using boot loader shells.
  • Use systemd rescue and emergency modes.

Terms and Utilities:

  • mount
  • fsck
  • inittab, telinit and init with SysV init
  • The contents of /boot/, /boot/grub/ and /boot/efi/
  • EFI System Partition (ESP)
  • GRUB
  • grub-install
  • efibootmgr
  • UEFI shell
  • initrd, initramfs
  • Master boot record
  • systemctl

Piste : • 200.2 - Predict Future Resource Needs • 203.1 - Operating the Linux filesystem • 204.1 - Configuring RAID • 203.3 - Creating and configuring filesystem options • 206.1 - Make and install programs from source • 206.2 - Backup operations • 202.3 - Alternate Bootloaders • 201.2 - Compiling a kernel • 200.1 - Measure and Troubleshoot Resource Usage • 202.2 - System Recovery

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