Define, Build and Modify Container Images CKAD Practice Questions (Page 4)

Questions 16–20

1. 16foundation · easy

   Which command uploads a container image to a registry?

   • Adocker pull
   • Bdocker push
   • Cdocker upload
   • Ddocker save
   Reveal Solution Discussion Select an answer first
2. 17foundation · easy

   What is the purpose of tagging an image with multiple tags?

   • ATo create multiple copies of the image on disk.
   • BTo increase the security of the image.
   • CTo allow multiple names or versions to refer to the same image.
   • DTo make the image available on multiple registries.
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4. 18application · medium

   A developer has an image myapp:latest that runs a web server. The developer needs to change the default port from 8080 to 9090. The developer has the Dockerfile and wants to make the change permanent. Which approach correctly modifies the image?

   • ARun a container, change the port in the application configuration, and commit the container.
   • BEdit the Dockerfile to change EXPOSE 8080 to EXPOSE 9090, then rebuild the image.
   • CUse docker tag to create a new tag with the new port.
   • DRun docker run -p 9090:8080 myapp:latest.
   Reveal Solution Discussion Select an answer first
5. 19application · easy

   A developer has built an image and tagged it as myapp:1.0. The developer realizes that the tag should be myapp:v1.0 to match the versioning convention. The image has not been pushed to a registry yet. Which command correctly re-tags the image?

   • Adocker tag myapp:1.0 myapp:v1.0
   • Bdocker build -t myapp:v1.0 .
   • Cdocker push myapp:1.0 myapp:v1.0
   • Ddocker rename myapp:1.0 myapp:v1.0
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6. 20application · medium

   A developer is building an image from a Dockerfile in the current directory. The Dockerfile uses a base image that is stored in a private registry. The developer has already logged in to the registry. The build fails with a 'pull access denied' error. Which action is most likely to resolve the issue?

   • ARun docker pull for the base image manually.
   • BRun docker build with the --no-cache flag.
   • CChange the base image to a public image.
   • DRun docker login to the private registry again and verify the credentials.
   Reveal Solution Discussion Select an answer first