Module 2: Introduction to Containers

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In this post, I provide complete, accurate, and detailed explanations for the answers to Module 2: Introduction to Containers of Course 6: Developing Containerized Applications on Google Cloud – Preparing for Google Cloud Certification: Cloud Developer Professional Certificate

Whether you’re preparing for quizzes or brushing up on your knowledge, these insights will help you master the concepts effectively. Let’s dive into the correct answers and detailed explanations for each question!

Quiz

Graded Assignment

1. A container image is:

  • A manifest that is used to build a virtual machine.
  • A package with your application and everything that the application needs to run. ✅
  • A base runtime system that you can use to bootstrap your application.
  • A script that is used to deploy source code to a container platform.

Explanation:
A container image is a lightweight, standalone, and executable package that includes all necessary dependencies, libraries, and configurations required to run an application. It ensures consistency across different environments.

2. Which of the following statements about using Docker are correct? Select three.

  • A Dockerfile contains a set of instructions that is used to build a container image. ✅
  • A multi-stage build is used to create optimized and secure container images. ✅
  • When building a container image, if you try to use a base image that is not available in the local image repository, the Docker build fails.
  • Dockerfiles provide a powerful, and flexible mechanism to create container images. ✅
  • You must pre-build your application from source files before using Docker.

Explanation:

  • A Dockerfile is a text file containing step-by-step instructions to create a container image.
  • Multi-stage builds help reduce the size of the final image by separating the build and runtime environments.
  • Dockerfiles provide flexibility by allowing developers to define configurations, dependencies, and optimizations in a structured way.

3. Which of the following statements about Buildpacks are correct? Select three.

  • To create a container image with Buildpacks, you must first develop your own builder.
  • When processing a source directory, a builder executes two phases of a buildpack: the detect phase and the build phase. ✅
  • Buildpacks are distributed and executed in OCI images called builders, where each builder can support a single source code language.
  • Google Cloud’s buildpacks are built into Cloud Run. ✅
  • Buildpacks are a way to turn your application source code into a container image without writing a Dockerfile. ✅

Explanation:

  • Buildpacks use two main phases: detect phase (determines which buildpacks to apply) and build phase (creates the image).
  • Google Cloud’s buildpacks are natively integrated into Cloud Run, simplifying deployment.
  • Buildpacks automate container image creation without needing a Dockerfile, making containerization easier for developers.

4. Which of the following statements about Cloud Build are correct? Select two.

  • You cannot use a Dockerfile when building container images with Cloud Build.
  • In addition to Cloud Source Repositories, Cloud Build integrates with different source code repositories such as GitHub, Bitbucket, and GitLab. ✅
  • With Cloud Build, you can continuously build, test, and deploy your application on Google Cloud. ✅
  • You can only run builds manually when using Cloud Build.

Explanation:

  • Cloud Build integrates with various repositories (GitHub, GitLab, Bitbucket, etc.) to automate builds.
  • Cloud Build supports CI/CD pipelines, allowing developers to build, test, and deploy applications continuously.

5. What are three best practices to use when working with containers or container images?

  • Run your application as the root user in the container.
  • Remove unnecessary files and tools from the container image. ✅
  • Launch the container process with the CMD or ENTRYPOINT instruction in your Dockerfile. ✅
  • When building a Docker container image, the instruction to add your source code should be placed as early as possible near the top of the Dockerfile.
  • Scan your container images for software vulnerabilities. ✅

Explanation:

  • Removing unnecessary files reduces the container image size and improves security.
  • Using CMD or ENTRYPOINT ensures the correct execution of the main application process inside the container.
  • Scanning container images for vulnerabilities helps identify and fix security risks.

Related contents:

Module 3: Introduction to Cloud Run and Google Kubernetes Engine

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