Unable to download docker golang image: No command specified - docker

Question

Newbie in docker here.
I want to build a project using go language and my docker-compose.yml file has the following:
go:
image: golang:1.7-alpine
volumes:
- ./:/server/http
ports:
- "80:8080"
links:
- postgres
- mongodb
- redis
environment:
DEBUG: 'true'
PORT: '8080'
When I run docker-compose up -d in terminal, it returns the following error:
`ERROR: for go Cannot create container for service go: No command specified`
How should I fix it?

Answer 1

Golang:1.7-alpine is just a basis for building a Go container, and does not have a CMD or an ENTRYPOINT, so ends immediately.
Use an image doing really something, like printing hello world every 45 seconds

Answer 2

I solved it by using golang:1.7 instead of golang:1.7-alpine.

Answer 3

You should run your container with an argument which will be passed to the default ENTRYPOINT, to be executed as a command
But the best practice these days is to use multistage, in order to generate a smaller image with just your application.
Or you can define your ENTRYPOINT being your build Go application.
See 'Using Docker Multi-Stage Builds with Go ', using the new AS build-stage keyword.
Your Dockerfile would be:
# build stage
ARG GO_VERSION=1.8.1
FROM golang:${GO_VERSION}-alpine AS build-stage
MAINTAINER fbgrecojr#me.com
WORKDIR /go/src/github.com/frankgreco/gobuild/
COPY ./ /go/src/github.com/frankgreco/gobuild/
RUN apk add --update --no-cache \
wget \
curl \
git \
&& wget "https://github.com/Masterminds/glide/releases/download/v0.12.3/glide-v0.12.3-`go env GOHOSTOS`-`go env GOHOSTARCH`.tar.gz" -O /tmp/glide.tar.gz \
&& mkdir /tmp/glide \
&& tar --directory=/tmp/glide -xvf /tmp/glide.tar.gz \
&& rm -rf /tmp/glide.tar.gz \
&& export PATH=$PATH:/tmp/glide/`go env GOHOSTOS`-`go env GOHOSTARCH` \
&& glide update -v \
&& glide install \
&& CGO_ENABLED=0 GOOS=`go env GOHOSTOS` GOARCH=`go env GOHOSTARCH` go build -o foo \
&& go test $(go list ./... | grep -v /vendor/) \
&& apk del wget curl git
# production stage
FROM alpine:3.5
MAINTAINER fbgrecojr#me.com
COPY --from=build-stage /go/src/github.com/frankgreco/go-docker-build/foo .
ENTRYPOINT ["/foo"]