Golang Dockerfile example

Dockerfile.dev

# Start from golang base image
FROM golang:1.13 as builder

# Install git.
# Git is required for fetching the dependencies.
RUN apk update && apk add --no-cache git

# Set the current working directory inside the container 
WORKDIR /app
# Copy files 
COPY . /app
# Build the Go app
RUN CGO_ENABLED=0 GOOS=linux GOPROXY=https://proxy.golang.org go build -o app cmd/myapp/main.go

# Start a new stage from scratch
FROM alpine:latest
# mailcap adds mime detection and ca-certificates help with TLS (basic stuff)
RUN apk --no-cache add ca-certificates mailcap && addgroup -S app && adduser -S app -G app
USER app

WORKDIR /app
COPY --from=builder /app/app .

# Expose port to the outside world
EXPOSE 8080

#Command to run the executable
ENTRYPOINT ["./app"]