├── .gitignore
├── Dockerfile
├── Dockerfile.alpine
├── Dockerfile.scratch
├── LICENSE
├── Makefile
├── README.md
└── main.go


/.gitignore:
--------------------------------------------------------------------------------
 1 | # Compiled Object files, Static and Dynamic libs (Shared Objects)
 2 | *.o
 3 | *.a
 4 | *.so
 5 | 
 6 | # Folders
 7 | _obj
 8 | _test
 9 | 
10 | # Architecture specific extensions/prefixes
11 | *.[568vq]
12 | [568vq].out
13 | 
14 | *.cgo1.go
15 | *.cgo2.c
16 | _cgo_defun.c
17 | _cgo_gotypes.go
18 | _cgo_export.*
19 | 
20 | _testmain.go
21 | 
22 | *.exe
23 | *.test
24 | *.prof
25 | 
26 | app
27 | 


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/Dockerfile:
--------------------------------------------------------------------------------
 1 | # build stage
 2 | FROM golang:alpine AS build-env
 3 | ADD . /src
 4 | RUN cd /src && go build -o app
 5 | 
 6 | # final stage
 7 | FROM alpine
 8 | WORKDIR /app
 9 | COPY --from=build-env /src/app /app/
10 | ENTRYPOINT ./app
11 | 


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/Dockerfile.alpine:
--------------------------------------------------------------------------------
1 | FROM golang:alpine
2 | WORKDIR /app
3 | ADD . /app
4 | RUN cd /app && go build -o app
5 | ENTRYPOINT ./app
6 | 


--------------------------------------------------------------------------------
/Dockerfile.scratch:
--------------------------------------------------------------------------------
1 | FROM centurylink/ca-certs
2 | 
3 | ADD app /
4 | 
5 | ENTRYPOINT ["/app"]
6 | 


--------------------------------------------------------------------------------
/LICENSE:
--------------------------------------------------------------------------------
 1 | MIT License
 2 | 
 3 | Copyright (c) 2017 Bo-Yi Wu
 4 | 
 5 | Permission is hereby granted, free of charge, to any person obtaining a copy
 6 | of this software and associated documentation files (the "Software"), to deal
 7 | in the Software without restriction, including without limitation the rights
 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 9 | copies of the Software, and to permit persons to whom the Software is
10 | furnished to do so, subject to the following conditions:
11 | 
12 | The above copyright notice and this permission notice shall be included in all
13 | copies or substantial portions of the Software.
14 | 
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 | SOFTWARE.
22 | 


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/Makefile:
--------------------------------------------------------------------------------
1 | 
2 | build:
3 | 	CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o app
4 | 
5 | scratch: build
6 | 	docker build -f Dockerfile.scratch -t appleboy/go-app .
7 | 


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/README.md:
--------------------------------------------------------------------------------
 1 | # docker-multi-stage-build
 2 | 
 3 | [Multi-Stage][1] Docker Builds for Creating Tiny Go Images
 4 | 
 5 | [1]:https://github.com/moby/moby/pull/32063
 6 | 
 7 | ## Single-stage build
 8 | 
 9 | See the [Dockerfile.alpine](./Dockerfile.alpine)
10 | 
11 | ```dockerfile
12 | FROM golang:alpine
13 | WORKDIR /app
14 | ADD . /app
15 | RUN cd /app && go build -o app
16 | ENTRYPOINT ./app
17 | ```
18 | 
19 | build and run as the following command.
20 | 
21 | ```sh
22 | $ docker build -f Dockerfile.alpine -t appleboy/go-app .
23 | $ docker run --rm appleboy/go-app
24 | ```
25 | 
26 | **258 MB**, just for our single little Go binary. 
27 | 
28 | ## Multi-Stage build
29 | 
30 | See the [Dockerfile.alpine](./Dockerfile.alpine)
31 | 
32 | ```dockerfile
33 | # build stage
34 | FROM golang:alpine AS build-env
35 | ADD . /src
36 | RUN cd /src && go build -o app
37 | 
38 | # final stage
39 | FROM alpine
40 | WORKDIR /app
41 | COPY --from=build-env /src/app /app/
42 | ENTRYPOINT ./app
43 | ```
44 | 
45 | build and run as the following command.
46 | 
47 | ```sh
48 | $ docker build -t appleboy/go-app .
49 | $ docker run --rm appleboy/go-app
50 | ```
51 | 
52 | **6.35 MB**. Much better.
53 | 


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/main.go:
--------------------------------------------------------------------------------
1 | package main
2 | 
3 | import "fmt"
4 | 
5 | func main() {
6 | 	fmt.Println("Hello World!")
7 | }
8 | 


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