LFCS Question #736: Real Exam Question with Answer & Explanation

Question

Which of the following options for the kernel's command line changes the systemd boot target to rescue.target instead of the default target?

Options

• Asystemd.target=rescue.target
• Bsystemd.runlevel=rescue.target
• Csystemd.service=rescue.target
• Dsystemd.default=rescue.target
• Esystemd.unit=rescue.target

Explanation

To change the systemd boot target to rescue.target via the kernel command line, the systemd.unit=rescue.target option is used.

Common mistakes.

• A. systemd.target= is not the correct kernel parameter; the correct syntax for specifying a unit is systemd.unit=.
• B. systemd.runlevel= is incorrect; systemd uses targets (e.g., rescue.target, multi-user.target) instead of traditional runlevels, and systemd.unit is the parameter for overriding the default.
• C. systemd.service= is not the correct kernel parameter; while rescue.target is composed of services, the parameter to specify a boot target is systemd.unit=.
• D. systemd.default= is not the correct kernel parameter; the parameter to override the default systemd boot unit is systemd.unit=.

Concept tested. systemd boot targets, kernel parameters

Reference. https://www.freedesktop.org/software/systemd/man/systemd.html#Kernel%20Command%20Line

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