docker-compose environment property not available in php built-in web server

Question

To demonstrating the issue, I setup a sample laravel app in a dockerfile which uses php built-in server:

FROM composer:latest

WORKDIR /var/www/html

RUN composer create-project laravel/laravel . --no-dev

RUN mv ./.env.example .env

RUN php artisan key:generate

RUN echo "<?php Route::get('test', fn() => dump(getenv('MY_ENV')));" > routes/api.php

CMD php artisan serve --host 0.0.0.0

As you can see i added a route to simply dump the MY_ENV variable which defined in docker-compose.yml file:

version: "3.8"

services: 
  laravel:
    build: .
    tty: true
    ports:
      - '8000:8000'
    environment:
      MY_ENV: 123

And: docker compose up -d then head over to localhost:8000/api/test.

As you can see getenv return false but i expected it to be 123

The interesting part is, When i use laravel tinker the variable is available :

But this variable is not available in the actual app, What would be the problem here?

Maybe change the way you get the values to stackoverflow.com/a/67467436/1213708 — Nigel Ren
– Nigel Ren, Commented Oct 1, 2022 at 12:13

luca-rigutti · Accepted Answer · 2022-10-01 13:19:11Z

0

From what I know, the docker compose environment it's not for build the image.

If you want to pass the argument to the dockerfile throught the docker-cmpose.yml you need to use this

version: "3.8"

services: 
  laravel:
    build: .
      args:
        MY_ENV: 123
    tty: true
    ports:
      - '8000:8000'
    environment:
      MY_ENV: 123

And in the dockerfile you setup the ARG MY_ENV to use it, like this:


ARG MY_ENV
FROM composer:latest

WORKDIR /var/www/html

RUN composer create-project laravel/laravel . --no-dev

RUN mv ./.env.example .env

RUN php artisan key:generate

RUN echo "<?php Route::get('test', fn() => dump($buildno));" > routes/api.php

CMD php artisan serve --host 0.0.0.0

Reference: How to define build args in docker compose

answered Oct 1, 2022 at 13:19

luca-rigutti

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5 Comments

Mwthreex Over a year ago

Thanks, But the weird issue is, When i use ngnix as web server, It read the environment variables.

Mwthreex Over a year ago

ARG is fine, But i need to use ENV variables because i need to override .env variables file

luca-rigutti Over a year ago

@Mwthreex When you said that ngnix it read the environment, is it after the build of image? Because what I think is that you can't using env during building image, because it's docker and not the ngnix server running.

Mwthreex Over a year ago

the CMD instructor is not execute in the build time, Doesn't it ? Because i boot up web server with CMD in last line of dockerfile.

luca-rigutti Over a year ago

@Mwthreex from the documentation of docker

Do not confuse RUN with CMD. RUN actually runs a command and commits the result; CMD does not execute anything at build time, but specifies the intended command for the image.

docs.docker.com/engine/reference/builder/#cmd So the server isn't running until the image is created, then you can access to env file.

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