305-300 Container Virtualization Practice Question
You are migrating a legacy application to an LXC container and need to ensure the container has access to the host's /dev/sda block device. Which configuration key must be added to the container's configuration file?
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
✓
lxc.cgroup.devices.allow = b 8:0 rwm
To allow a container to access host devices, the lxc.cgroup.devices.allow and lxc.mount.entry must be configured properly in the container config.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
lxc.mount.device = /dev/sda
Why it's wrong here
This is not the correct syntax for mounting host devices in LXC.
- ✗
lxc.cap.sys_admin = 1
Why it's wrong here
This grants administrative capabilities but does not map the specific block device.
- ✓
lxc.cgroup.devices.allow = b 8:0 rwm
Why this is correct
This allows the container to access block device 8:0, which corresponds to /dev/sda.
- ✗
lxc.dev.access = /dev/sda
Why it's wrong here
This is not a valid LXC configuration directive.
About these practice questions
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official LPI exam blueprint
This 305-300 practice question is part of Courseiva's free LPI certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 305-300 exam.