[Solved] You want to build a minimal container with a Go app using scratch. Which Dockerfile snippet correctly builds and runs the app?FROM golang:1.20 AS builder WORKDIR /app COPY . . RUN go build -o myapp .... | Docker

Docker - Image Optimization

You want to build a minimal container with a Go app using scratch. Which Dockerfile snippet correctly builds and runs the app?

FROM golang:1.20 AS builder
WORKDIR /app
COPY . .
RUN go build -o myapp .

FROM scratch
COPY --from=builder /app/myapp /
CMD ["/myapp"]

AThis multi-stage build compiles a static binary and runs it on scratch

BThis will fail because scratch cannot copy from builder

CThe CMD should be a shell command to run myapp

DThe Go app must be built inside scratch

Step-by-Step Solution

Solution:

Step 1: Understand multi-stage build
The first stage builds the Go app with all tools, producing a binary.
Step 2: Use scratch for minimal runtime
The second stage copies the binary into scratch and runs it directly, which is correct.
Final Answer:
This multi-stage build compiles a static binary and runs it on scratch -> Option A
Quick Check:
Multi-stage build + scratch = minimal static binary container [OK]

Quick Trick: Use multi-stage build to get static binary for scratch [OK]

Common Mistakes:

Master "Image Optimization" in Docker

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You want to build a minimal container with a Go app using scratch. Which Dockerfile snippet correctly builds and runs the app?