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Dockerfile
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Dockerfile
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# Start from the specific golang base image
FROM golang:1.21rc3-bullseye AS builder
# Add Maintainer Info
LABEL maintainer="Nikolay Stankov <[email protected]>"
# Set the Current Working Directory inside the container
WORKDIR /app
# Copy go.mod and go.sum files first for layers caching
COPY go.mod go.sum ./
# Download all dependencies. Dependencies will be cached if the go.mod and go.sum files are not changed
RUN go mod download
# Now copy the rest of the source code. If any changes are made in the source code,
# Docker will invalidate the cache for this step and all subsequent steps.
# This is the "cache busting" step.
COPY . .
ARG CORES=4
# Build the Go app
RUN CGO_ENABLED=0 GOOS=linux go build -o main -p ${CORES} ./
# Start a new stage from scratch
FROM gcr.io/distroless/base-debian11
# Copy the Pre-built binary file from the previous stage
COPY --from=builder /app/main /root/main
# Set the working directory and the entrypoint
WORKDIR /root/
ENTRYPOINT ["./main"]