Crucial Exams

CompTIA Linux+ XK0-006 (V8) Practice Question

Consider the following excerpt from a Dockerfile used to containerize a Go microservice:

FROM golang:1.22-alpine AS builder
WORKDIR /src
COPY . .
RUN go build -o /app/service

FROM scratch
COPY --from=builder /app/service /service
ENTRYPOINT ["/service"]

What specific effect does the second FROM scratch instruction have on the image-build process?

  • It merges the filesystem layers from the builder stage with those of scratch, producing an image that contains both the Go toolchain and the compiled binary.

  • It instructs Docker to pull the scratch image from Docker Hub; if the image cannot be pulled the build fails.

  • It reuses the builder stage as the base of the final image but strips its tag, keeping all previously installed packages and tools.

  • It starts a new build stage with an empty filesystem, so none of the layers from the golang:1.22-alpine stage are included unless files are explicitly copied with --from.

CompTIA Linux+ XK0-006 (V8)
Services and User Management
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