docker compose ignoring `.dockerignore`-CodePudding

Despite placing 2 .dockerignores in project root and in packages, docker compose copies node_modules in myapp.

.dockerignore

*node_modules*

Project directory looks like:

myproject
├── .dockerignore
├── docker-compose.yml
└── packages
    └── myapp
        ├── node_modules
        ├── .dockerignore
        ├── .gitignore
        ├── Dockerfile
        ├── README.md
        ├── package-lock.json
        ├── package.json
        ├── public
        │   ├── favicon.ico
        │   ├── index.html
        │   ├── logo192.png
        │   ├── logo512.png
        │   ├── manifest.json
        │   └── robots.txt
        └── src
            ├── App.css
            ├── App.js
            ├── App.test.js
            ├── index.css
            ├── index.js
            ├── logo.svg
            ├── reportWebVitals.js
            └── setupTests.js

docker-compose.yml

version: '3'

services:
  client:
    image: myapp
    build:
      context: '.'
      dockerfile: 'packages/myapp/Dockerfile'
    ports:
      - "3000:3000"

Dockerfile

FROM alpine
WORKDIR /usr/app
COPY . .
RUN apk add --update nodejs npm
RUN npm install
CMD ["npm", "start"]

No matter what I do, node_modules will be copied:

myproject % docker-compose build
[ ] Building 10.9s (5/9)                                                        
 => [internal] load build definition from Dockerfile                       0.0s
 => => transferring dockerfile: 31B                                        0.0s
 => [internal] load .dockerignore                                          0.0s
 => => transferring context: 55B                                           0.0s
 => [internal] load metadata for docker.io/library/alpine:latest           0.0s
 => [1/5] FROM docker.io/library/alpine                                    0.0s
 => CANCELED [internal] load build context                                10.7s
 => => transferring context: 53.88MB                                      10.7s
canceled

To generate project:

mkdir myproject
cd myproject
mkdir packages
cd packages
npx create-react-app myapp

and copy docker files included

CodePudding user response：

The .dockerignore file that is used is in the root of your context, in this case the same directory as your docker-compose.yml file. But the contents are invalid for ignoring that file. To ignore a node_modules folder in any subdirectory, the syntax should be:

**/node_modules

However, that would result in your COPY command pulling in the packages directory at the top. So you more likely want to change your context:

version: '3'

services:
  client:
    image: myapp
    build:
      context: 'packages/myapp'
    ports:
      - "3000:3000"

And then the .dockerignore in the myapp folder would only need:

node_modules