Dockerfile

FROM golang:1.12.13-alpine as builder

WORKDIR /go/src/github.com/christian-kreuzberger-dtx/go-mini-server

# Force the go compiler to use modules
ENV GO111MODULE=on
ENV GOPROXY=https://proxy.golang.org

RUN apk add --no-cache gcc libc-dev

# Copy `go.mod` for definitions and `go.sum` to invalidate the next layer
# in case of a change in the dependencies
COPY go.mod go.sum ./

# Download dependencies
RUN go mod download

# Copy local code to the container image.
COPY . .

# Build the command inside the container.
# (You may fetch or manage dependencies here,
# either manually or with a tool like "godep".)
RUN GOOS=linux go build -ldflags '-linkmode=external' -v main.go

# Use a Docker multi-stage build to create a lean production image.
FROM alpine:3.11
# we need to install ca-certificates and libc6-compat for go programs to work properly
RUN apk add --no-cache ca-certificates libc6-compat

# Copy the binary to the production image from the builder stage.
COPY --from=builder /go/src/github.com/christian-kreuzberger-dtx/go-mini-server/main /main

EXPOSE 8080

# required for external tools to detect this as a go binary
ENV GOTRACEBACK=all

# Run the web service on container startup.
CMD ["/main"]