Define, Build and Modify Container Images CKAD Practice Questions (Page 2)

Questions 6–10

1. 6foundation · easy

   What is the purpose of the build context in a `docker build` command?

   • AIt is the directory where the resulting image is stored on the host.
   • BIt is the set of files and directories that are accessible to the build process, typically the current directory.
   • CIt is the list of environment variables used during the build.
   • DIt is the environment in which the container will run, such as production or staging.
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2. 7application · medium

   A developer has built an image and tagged it as myapp:1.0. The developer wants to share this image with a colleague by pushing it to a public registry. The developer is logged in to Docker Hub. Which command correctly pushes the image?

   • Adocker push myapp:1.0
   • Bdocker push myapp:1.0 --registry docker.io
   • Cdocker push username/myapp:1.0
   • Ddocker push docker.io/myapp:1.0
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4. 8foundation · easy

   Which `docker build` flag is used to tag the resulting image with a name and version?

   • A-p
   • B-t
   • C-f
   • D-d
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5. 9foundation · easy

   Which practice helps reduce the number of layers in a container image?

   • ACombining multiple RUN commands into a single RUN instruction.
   • BUsing the EXPOSE instruction to declare ports.
   • CUsing the ENV instruction to set environment variables.
   • DUsing the ADD instruction instead of COPY.
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6. 10expert · hard

   A platform team maintains a Go application that compiles to a static binary. The current Dockerfile uses golang:1.22 as the base image, copies source code, runs go build, and then runs the binary in the same image. The image is 800MB and the team wants to reduce it to under 50MB. The build environment has access to the Docker daemon and the Go build cache. Which approach best achieves the size reduction while keeping the build reproducible?

   • AChange the base image to alpine and install the Go compiler via apk, then build and run in the same image.
   • BUse a multi-stage build: compile in golang:1.22, then copy the binary to a scratch or distroless base image.
   • CUse a single-stage build but add a RUN rm -rf /usr/local/go command after the build to remove the toolchain.
   • DUse docker commit after building the binary in a temporary container to create a new image from the container's filesystem.
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