What is the primary purpose of a Docker volume?

To isolate the container's network traffic

To store the container's configuration files

To increase the performance of container I/O operations

To persist data independently of the container lifecycle

A development team is building a Docker image for a Node.js application. The Dockerfile installs dependencies with npm install. The team notices that every build takes a long time because npm install re-runs even when package.json has not changed. Which Dockerfile change improves build caching?

Copy package.json and package-lock.json first, run npm install, then copy the rest of the source code.

Use the --no-cache flag with docker build.

Combine all COPY instructions into a single COPY . . instruction.

Run npm install before the FROM instruction.

LPIC-3 Virtualization and Containerization

Domain 2Objective 3

352.3 Docker (weight: 9) LPIC-3-VIRTUALIZATION Practice Questions (Page 1)

Part of the Topic 352: Container Virtualization domain, which makes up ~32% of our current practice bank. Linux Professional Institute does not publish an official question count, but from its 90-minute exam (~35–60 total, ~11–19 in this domain), expect 3–5 from this objective — we provide 24 practice questions to prepare you well beyond it. (estimate)

24questions here

5free pages

9concepts

Questions 1–5

1foundation · easy
Which command pulls an image from a registry and then runs a container from it in a single step?
Select an answer first
2foundation · easy
Which command is used to view the logs of a running or stopped container?
Select an answer first
3application · easy
A user runs docker run hello-world and receives the message 'Unable to find image 'hello-world:latest' locally'. The command then proceeds to pull the image and run it. Which component is responsible for pulling the image from Docker Hub?
Select an answer first
4foundation · easy
What is the primary purpose of a Docker volume?
Select an answer first
5expert · hard
A development team is building a Docker image for a Node.js application. The Dockerfile installs dependencies with npm install. The team notices that every build takes a long time because npm install re-runs even when package.json has not changed. Which Dockerfile change improves build caching?
Select an answer first

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352.3 Docker (weight: 9) LPIC-3-VIRTUALIZATION Practice Questions (Page 1)

Questions 1–5

Which command pulls an image from a registry and then runs a container from it in a single step?

Which command is used to view the logs of a running or stopped container?

A user runs docker run hello-world and receives the message 'Unable to find image 'hello-world:latest' locally'. The command then proceeds to pull the image and run it. Which component is responsible for pulling the image from Docker Hub?

What is the primary purpose of a Docker volume?

A development team is building a Docker image for a Node.js application. The Dockerfile installs dependencies with npm install. The team notices that every build takes a long time because npm install re-runs even when package.json has not changed. Which Dockerfile change improves build caching?

Keep studying — Topic 352: Container Virtualization