Use Docker env vars with PHP 5.2.x

user_2308683 0
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I have inherited some code that was written with PHP 5.2, and rather than installing myself, I have it running in a Docker container.

This system also depends on MySQL, so using Docker Compose and extracting the database credentials to a more secured location...

version: "3"

services:

    mariadb:
        image: mariadb:10.5
        environment:
            MYSQL_ROOT_PASSWORD: ${DB_ROOT_PASSWORD}
            MYSQL_USER: ${DB_USER}
            MYSQL_PASSWORD: ${DB_PASSWORD}
            MYSQL_DATABASE: ${DB_DATABASE}
        volumes:
            - ./conf/mariadb/initdb.d:/docker-entrypoint-initdb.d/:ro
        ports:
            - "3306:3306"

    nginx:
        image: nginx:alpine
        depends_on: 
            - php-fpm
        volumes:
            - ${LOCAL_WORKING_DIR}:${REMOTE_WORKING_DIR}
            - ./conf/nginx/nginx.conf:/etc/nginx/nginx.conf
            - ./conf/nginx/conf.d/:/etc/nginx/conf.d/
            # - ./conf/nginx/ssl/:/etc/nginx/ssl/
        ports:
            - "8080:80"
            # - "8443:443"

    php-fpm:
        build: 
            context: docker/app
            args:
                APP_ENV: ${APP_ENV}
                PHP_VERSION: ${PHP_VERSION}
                REMOTE_WORKING_DIR: ${REMOTE_WORKING_DIR}
        depends_on: 
            - mariadb
        working_dir: ${REMOTE_WORKING_DIR}
        volumes:
            - ${LOCAL_WORKING_DIR}:${REMOTE_WORKING_DIR}
            - ./conf/php/www.conf:/usr/local/etc/php-fpm.d/www.conf:ro
            # - ./conf/php/xdebug.ini:/usr/local/etc/php/conf.d/xdebug.ini:ro
            - ./conf/php/php-ini-overrides.ini:/usr/local/etc/php/conf.d/99-overrides.ini:ro
        environment: 
            DB_HOST: mariadb:3306
            DB_USER: ${DB_USER}
            DB_PASSWORD: ${DB_PASSWORD} 
            DB_DATABASE: ${DB_DATABASE}
        ports:
            - "9000:9000"

Dockerfile

FROM devilbox/php-fpm:5.2-base
EXPOSE 9000
CMD ["php-fpm"]

Using phpinfo() shows none of those values in $_ENV or $_SERVER, and getenv() returns empty strings.

I have seen latest php-fpm related issues saying this is solved with clear_env: no, but this is only available in PHP-FPM 5.4+

I have tried to use composer to install dotenv, but that seemed to require PHP7. Same for trying to install Vault to read database credentials remotely.

What else could I try to get this code to run as-is with minimal changes?

Options I have thought:

  1. Start up a secondary REST server that exposes a preconfigured environment, then request to that from PHP... Seems hacky, but better than hard-coding database creds in any code, and would achieve a similar result as using Vault.
  2. Mount my .env file, then parse it out, but that requires more code changes that would be removed later anyway
fpm docker environment-variables php
2 Answers

most probably those env are overridden somewhere in image you are using. docker compose allows to define a command to run on startup. So you can override env vars on startup to whatever you need:

command: bash -c "DB_HOST='mariadb:3306' && DB_USER='some_user ... & ./start_something.sh"

EDIT:

as comment mentioned php require all env to be in php-fpm.conf. strange as for me but it's easy enough to work around by adding env vars you need into this file in same command: statement of docker compose. Simple echo "ENV_NAME" >> ..../php-fpm.conf should help you.

or you can modify Dockerfile so your image has simple sh script which would dump all env vars into that php config.

i am modifying mongo config so works as replica set - works like a charm.

user_29326880

I found an XML file at /usr/local/etc/php-fpm.conf that contained the Environment variables, and filled it in using dockerize

<value name="environment">
    <!-- Add docker environment variables -->
    {{ range $k,$v := .Env }}{{ $parts := split $k "APP_" }}{{ if eq (len $parts) 2 -}}
    <value name="{{ index $parts 1 }}">{{ $v }}</value>
    {{ end }}{{- end -}}
    <!-- End Docker Env -->

With docker-compose having

environment:
    APP_DB_HOST: mariadb:3306
    APP_DB_USER: ${DB_USER}
    APP_DB_PASSWORD: ${DB_PASSWORD} 
    APP_DB_DATABASE: ${DB_DATABASE}

enter image description here

user_23086830
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