September 06, 2019
How to build a slim Docker container for your Go application using multi-stage images.
I'm using Go 1.13 and the community module proxy to build the binary and Alpine as a base image. It adds a user and group instead of running as root.
Be sure to replace "cmd/server/server.go" with your main file.
FROM golang:1.13 as builder WORKDIR /app COPY . /app RUN CGO_ENABLED=0 GOOS=linux GOPROXY=https://proxy.golang.org go build -o app cmd/server/server.go 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 . ENTRYPOINT [ "./app" ]
I hope this is helpful. I mostly blogged this to document it for myself.