Add multistage builds #226

image/demo/multistage-builds/.gitignore

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+app

image/demo/multistage-builds/Dockerfile

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+FROM golang:1.9-alpine
+RUN apk --no-cache add git
+WORKDIR /go/src/github.com/go/helloworld/
+RUN go get -d -v github.com/go-sql-driver/mysql
+COPY app.go .
+RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o app .
+
+FROM alpine:latest
+RUN apk --no-cache add ca-certificates
+WORKDIR /root/
+COPY --from=0 /go/src/github.com/go/helloworld/app .
+CMD ["./app"]

image/demo/multistage-builds/Dockerfile.build

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+FROM golang:1.9-alpine
+
+RUN apk --no-cache add git
+
+WORKDIR /go/src/github.com/go/helloworld
+
+COPY app.go .
+
+RUN go get -d -v github.com/go-sql-driver/mysql \
+  && CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o app .

image/demo/multistage-builds/Dockerfile.copy

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+FROM alpine:latest
+
+RUN apk --no-cache add ca-certificates
+
+WORKDIR /root/
+
+COPY app .
+
+CMD ["./app"]

image/demo/multistage-builds/Dockerfile.one

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+FROM golang:1.9-alpine
+
+RUN apk --no-cache add git ca-certificates
+
+WORKDIR /go/src/github.com/go/helloworld/
+
+COPY app.go .
+
+RUN go get -d -v github.com/go-sql-driver/mysql \
+  && CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o app . \
+  && cp /go/src/github.com/go/helloworld/app /root
+
+WORKDIR /root/
+
+CMD ["./app"]

image/demo/multistage-builds/app.go

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+package main
+
+import "fmt"
+
+func main(){
+    fmt.Printf("Hello World!");
+}

image/demo/multistage-builds/build.sh

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+#!/bin/sh
+
+echo Building go/helloworld:build
+
+docker build -t go/helloworld:build . -f Dockerfile.build
+
+docker create --name extract go/helloworld:build
+docker cp extract:/go/src/github.com/go/helloworld/app ./app
+docker rm -f extract
+
+echo Building go/helloworld:2
+
+docker build --no-cache -t go/helloworld:2 . -f Dockerfile.copy
+rm ./app