6. Interpret Contents of a Dockerfile 200-901 Practice Questions (Page 9)

Questions 41–43

1. 41foundation · easy

   What is the effect of the `WORKDIR /app` instruction in a Dockerfile?

   • AThe /app directory will be copied from the host
   • BAll subsequent instructions will run in the /app directory
   • CThe /app directory will be deleted after the build
   • DThe /app directory will be exposed as a volume
   Reveal Solution Discussion Select an answer first
2. 42expert · hard

   A team is building a Go binary for a network monitoring tool. The build requires the full Go toolchain, but the runtime image only needs the compiled binary. The team wants to minimize the final image size and avoid shipping the toolchain. Which Dockerfile strategy is the most appropriate?

   • AUse a single FROM golang:1.20 stage and copy the binary to a scratch image
   • BUse FROM golang:1.20 and delete the toolchain with RUN rm -rf /usr/local/go
   • CUse FROM scratch and install Go inside the image
   • DUse a multi-stage build with FROM golang:1.20 as builder and FROM scratch as final, copying the binary with COPY --from=builder
   Reveal Solution Discussion Select an answer first
3. 43foundation · easy

   Why is choosing an appropriate base image important when creating a Dockerfile?

   • AIt determines the operating system and available libraries inside the container
   • BIt sets the default command that runs when the container starts
   • CIt controls the maximum memory the container can use
   • DIt defines the network ports that the container will expose
   Reveal Solution Discussion Select an answer first