What is the main issue with this Dockerfile example FROM golang:1.16 WORKDIR /app COPY go.mod . COPY go.sum . RUN go mod download COPY . . RUN go build -o crashAnalysis . CMD ["./crashAnalysis"] EXPOSE 9090 - Missing ENV for configuration - Lack of multi-stage builds - Temporary files are never deleted - Suboptimal use of RUN - Port 8081 is not specified in the EXPOSE instruction

The main issue with this Dockerfile is the lack of multi-stage build, which leads to a large final image size and includes unnecessary files and build tools.

Details:

• It uses the base image golang:1.16, which contains all development and build tools but is heavy.
• After building the binary, all source files, caches, and tools remain in the image, increasing its size.
• The absence of multi-stage build prevents separating the build stage from the runtime stage.

It is recommended to use a multi-stage build, where the first stage builds the application, and the second creates a minimal image with only the binary and necessary dependencies.

Example of an improved Dockerfile:

FROM golang:1.16 AS builder
WORKDIR /app
COPY go.mod go.sum ./
RUN go mod download
COPY . .
RUN go build -o crashAnalysis .

FROM alpine:latest
WORKDIR /app
COPY --from=builder /app/crashAnalysis .
EXPOSE 9090
CMD ["./crashAnalysis"]

Additional tips:

• You can add ENV for configuration if needed.
• Optimize layers by combining RUN commands.
• Ensure that the port exposed in EXPOSE matches the application's port (the question mentions port 8081, but the Dockerfile specifies 9090).