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Over my ubuntu GNU/Linux machine I try to build the images from my project

docker-compose build --no-cache --force-rm

And I get the following error:

ERROR: Couldn't connect to Docker daemon at http+docker://localunixsocket - is it running?



If it's at a non-standard location, specify the URL with the DOCKER_HOST environment variable.

But when I try wiuth sudo I can build them:

sudo docker-compose build --no-cache --force-rm

But I find it somewhat mysterious because I can launch them without the need of sudo:

docker-compose up

The cause of the problem is that you have a volume mount point with root:root owner & group and caused this behavior.

The solution to this problem is to create a file named .dockerignore and put all the folders mounted as volumes.

For example if you have the following docker-compose.yml

version: '2'

services:

  data_map_prod:

    build:

      context: .

      dockerfile: Dockerfile

    image: 'pcmagas/data-map:latest'

    links:

      - 'neo4j'

      - 'mongodb'

    volumes:

      - './docker-volumes/app_dev:/var/log/datamap'

    ports:

      - "9780:9780"

    environment:

      NEO4J_HOST: 'neo4j'

      MONGO_CONNECTION_STRING: 'mongodb://mongodb:map'



  data_map_dev:

    build:

      context: .

      dockerfile: Dockerfile_dev

    image: 'pcmagas/data-map:dev'

    links:

      - 'neo4j_dev'

      - 'mongodb'

    volumes:

      - './src:/opt/map/src'

      - './www:/opt/map/www'

      - './package.json:/opt/map/package.json'

      - './docker-volumes/app_dev:/var/log/datamap'

    ports:

      - "9781:9780"

    environment:

      NEO4J_HOST: 'neo4j_dev'

      NEO4J_USER: 'neo4j'

      NEO4J_PASSWORD: 'neo4j'

      MONGO_CONNECTION_STRING: 'mongodb://mongodb:map_dev'



  neo4j_dev:

    image: 'neo4j'

    ports:

      - '7474:7474'

    volumes:

      - './docker-volumes/neo4j_dev/data:/data'

    environment:

      NEO4J_AUTH: 'neo4j/neo45j'



  neo4j:

    image: 'neo4j'

    volumes:

      - './docker-volumes/neo4j/data:/data'

    environment:

      NEO4J_AUTH: 'neo4j/neo45j'



  mongodb:

    image: 'mongo'

    ports:

      - '27017:27017'

    volumes:

      - './docker-volumes/mongodb/:/data/db'

Then you should create the following .dockerignore:

./docker-volumes

As you can see all the volumes are in ./docker-volumes folder.

Furtermore you can find solutions in: https://stackoverflow.com/questions/29101043/cant-connect-to-docker-from-docker-compose#29111083