Why docker-compose build can't run command but docker build can?

Question

My Dockerfile:

FROM node:10 AS builder
RUN npm install multi-file-swagger -g
WORKDIR /usr/src/app
COPY swagger/* ./
ARG API_HOST
ENV APP_HOST=$API_HOST
RUN sed -i 's+replace_host+'"$API_HOST"'+g' index.yaml
RUN multi-file-swagger index.yaml > index.json

FROM golang:1.12
WORKDIR /go/src/app
COPY . .
RUN go get -d -v ./...
RUN go install -v ./...
VOLUME /go/src/app
EXPOSE 8080
COPY --from=builder /usr/src/app/ swagger/
CMD ["app"]

My docker-compose.yml file:

version: '3.4'
services:
  myapp:
    build:
      context: .
      args:
        - API_HOST=api.my-real-domain.com
    volumes:
      - ./:/go/src/app
    ports:
      - "8080:8080"

If run docker build only:

docker build -t myapp . --build-arg API_HOST=api.my-real-domain.com

It can run the commands:

RUN sed -i 's+replace_host+'"$API_HOST"'+g' index.yaml
RUN multi-file-swagger index.yaml > index.json

And when lunch the container, I can find the index.json exists.

But if use docker-compose build and docker-compose up, then check the index.json in container, can't find it.

LinPy · Accepted Answer · 2019-08-08 11:04:54Z

1

you overwrite all your files in app folder by using:

volumes:
  - ./:/go/src/app

you need to remove the volume section from your compose

answered Aug 8, 2019 at 11:04

LinPy

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1 Comment

David Maze Over a year ago

The VOLUME in your Dockerfile isn't doing anything either and I'd strongly suggest removing it. (Its two most obvious effects will be preventing later RUN commands from working and leaking anonymous volumes when you docker run the container; it has no bearing on whether it's possible to hide the image contents like this or not.)

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