CODEWITHSUNDEEP
dockerdocker-composeenvironment-variables
mstdmstd
mstdmstd

Reputation: 626

Warning when setting variables in compose file with env_file

In my Docker/Laravel 5 project I'm trying to rename .env file of Docker(I have similar file in a Laravel project), so I added 2 lines to docker-compose.yml:

version: '3.1'

services:

    web:
        env_file:
            ./docker_app.env

        build:
            context: ./web
            dockerfile: Dockerfile.yml

        environment:
            - APACHE_RUN_USER=www-data
        volumes:
            - ${APP_PATH_HOST}:${APP_PTH_CONTAINER}

        ports:
            - 8081:80
        working_dir: ${APP_PTH_CONTAINER}


    db:
        image: mysql:5.7.24
        restart: always
        environment: 
            MYSQL_ROOT_PASSWORD: 1
        volumes:
            - ${DB_PATH_HOST}:/var/lib/mysql

but when I'm running the build command I get an error:

$ docker-compose up -d --build
WARNING: The APP_PATH_HOST variable is not set. Defaulting to a blank string.
WARNING: The APP_PTH_CONTAINER variable is not set. Defaulting to a blank string.
WARNING: The DB_PATH_HOST variable is not set. Defaulting to a blank string.
...
Step 2/3 : RUN apt-get update &&     apt-get install -y     libfreetype6-dev     libwebp-dev     libjpeg62-turbo-dev     libpng-dev     nano     libgmp-dev     libldap2-dev     netcat     sqlite3     git     libsqlite3-dev &&     docker-php-ext-configure gd --with-freetype-dir=/usr/include/ --with-webp-dir=/usr/include/  --with-jpeg-dir=/usr/include/ &&     docker-php-ext-install gd pdo pdo_mysql pdo_sqlite zip gmp bcmath pcntl ldap sysvmsg exif && a2enmod rewrite
 ...

docker_app.env contents are:

DB_PATH_HOST=./databases

APP_PATH_HOST=./SiteApp

APP_PTH_CONTAINER=/var/www/html/

docker-compose.yml, docker_app.env and SiteApp subdirectory are in the same root directory

If I set an invalid file for env_file parameter in docker-compose.yml will I get another error?

How to fix this error?

Thanks!

Upvotes: 0

Views: 3173

Answers (1)

Siyu
Siyu

Reputation: 12089

The variables in the docker-compose file is not the environment variables in the container, they are env from your working shell (on the host). Docker reads these variables from your host env and substitutes them in the docker-compose file.

You need to export your variables in the docker_app.env.

A quick way to do this is 

source docker_app.env
export $(cut -d= -f1 docker_app.env)

(credit to https://unix.stackexchange.com/questions/79064/how-to-export-variables-from-a-file)

PS

You can use docker-compose config to see substituted result.

Upvotes: 3

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