[golang] docker 빌드/실행 - ENV 없이 실행하기

go 앱을 docker빌드할 때 ENV를 쓰지 않아도 된다!!!

자세한 내용은 이곳을 참조했다.

https://hub.docker.com/_/golang/

Main.go 소스는 다음과 같다.

package main

import (

    "fmt"

)

func main() {

    fmt.Println("Hello World")

}

Dockerfile은 다음과 같다. 

FROM golang:onbuild

RUN mkdir /app

ADD . /app/

WORKDIR /app

RUN go build -o main .

CMD ["/app/main"]

이제 빌드와 실행을 해본다.

$ docker build -t example .

Sending build context to Docker daemon  4.096kB

Step 1/6 : FROM golang:onbuild

# Executing 3 build triggers...

Step 1/1 : COPY . /go/src/app

Step 1/1 : RUN go-wrapper download

 ---> Running in eb597cae57ef

+ exec go get -v -d

Step 1/1 : RUN go-wrapper install

 ---> Running in 3cc20f3cc840

+ exec go install -v

app

 ---> 11d942c55dfb

Removing intermediate container 4eca92f17e78

Removing intermediate container eb597cae57ef

Removing intermediate container 3cc20f3cc840

Step 2/6 : RUN mkdir /app

 ---> Running in 1035dea0ce0d

 ---> 9fbe4249fc32

Removing intermediate container 1035dea0ce0d

Step 3/6 : ADD . /app/

 ---> 8950d77f106e

Removing intermediate container d43b4043d9bf

Step 4/6 : WORKDIR /app

 ---> 465bff3b7275

Removing intermediate container d21a6bdc6c31

Step 5/6 : RUN go build -o main .

 ---> Running in 9e1c1b5a0123

 ---> 9e27407b57d4

Removing intermediate container 9e1c1b5a0123

Step 6/6 : CMD /app/main

 ---> Running in 4dbe90267d84

 ---> a8861bcaebad

Removing intermediate container 4dbe90267d84

Successfully built a8861bcaebad

Successfully tagged example:latest

실행 결과는 다음과 같다.

$ docker run -it --rm --name my-example example

Hello World