From 7fb0ebff20778fb6f367c99104897bab7b0cc08a Mon Sep 17 00:00:00 2001
From: Joel Schmid <joelschmidwitt@gmail.com>
Date: Sat, 3 Apr 2021 13:29:39 +0200
Subject: [PATCH] optimize Dockerfile using scratch image

---
 Dockerfile | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/Dockerfile b/Dockerfile
index 9930ff7..9eee3d7 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,13 +1,16 @@
-FROM golang:1.16
- 
+############################
+# STEP 1 build executable binary
+############################
+FROM golang:1.16 AS builder 
 RUN mkdir -p /weather-api
- 
 WORKDIR /weather-api
- 
 ADD . /weather-api
- 
-RUN go build ./main.go
+RUN env CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -a -ldflags "$(govvv -flags)" -o app
 
+# STEP 2 build a small image
+############################
+FROM scratch
+COPY --from=builder /weather-api/app /app
+COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
 EXPOSE 10000
-
-CMD ["./main"]
\ No newline at end of file
+ENTRYPOINT ["/app"]
\ No newline at end of file