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Domain 2
Boot & System Recovery
Boot process, GRUB, systemd targets, root password reset, recovery from broken fstab, and journal analysis. Roughly 15% of the EX200 exam.
Boot process, GRUB & targets
NewBIOS/UEFI → GRUB2 → kernel → systemd target. Change the default target, edit kernel parameters, and isolate targets at runtime.
~30 min~30% of domaingrub2systemctltargetisolate
Boot recovery & root password reset
NewThe classic RHCSA "I forgot the root password" recovery, plus rescuing from a broken /etc/fstab that drops you into emergency mode.
~35 min~35% of domainrd.breakemergencyrescuechroot
Journal & log analysis
NewRead the systemd journal with journalctl — filter by unit, boot, priority, and time window. Enable a persistent journal across reboots.
~25 min~25% of domainjournalctl-u-b-p