LPIC-1 System Architecture Practice Question
A Linux system using systemd fails to reach the default target after a recent change. The administrator wants to boot into a minimal environment to troubleshoot. Which kernel parameter should be added at the GRUB prompt?
⚠ Common exam trap
It's easy for candidates to confuse 'rescue.target' with 'emergency.target' or legacy SysVinit parameters like 'single', not realizing that systemd (as used in LPI Linux) requires explicit unit names and that 'emergency.target' is even more stripped down, often lacking a writable root filesystem or networking.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
systemd.unit=rescue.target
Systemd uses `systemd.unit=rescue.target` to boot into a minimal single-user environment with essential services, which is ideal for troubleshooting boot failures. This parameter overrides the default target at the GRUB prompt, allowing the administrator to diagnose and fix the issue without loading the full graphical or multi-user target.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
single
Why it's wrong here
Single is a SysV parameter; on systemd, it maps to rescue.target but is not a kernel parameter.
- ✓
systemd.unit=rescue.target
Why this is correct
Rescue target provides a minimal environment with root read-write and basic services.
- ✗
init=/bin/bash
Why it's wrong here
This bypasses systemd and gives a root shell, but not a proper rescue environment.
- ✗
systemd.unit=emergency.target
Why it's wrong here
Emergency target mounts root read-only and is too minimal for troubleshooting.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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