Docker File Environment variable issue in PHP

Question

I am using docker file for PHP Apache. I declare some environments variable in docker file but when I run the docker its only get Apache environment variable while my environment variable is not working. here is my docker file.

# Install     dependencies
From ubuntu:16.04
RUN apt-get update -y
RUN apt-get update && apt-get -y upgrade && DEBIAN_FRONTEND=noninteractive apt-get -y install \
    vim apache2 php7.0 php7.0-mysql php7.0-gd php7.0-mbstring libapache2-mod-php7.0 curl lynx-cur

RUN service apache2 stop

# Install app
RUN rm -rf /var/www/html/*
ADD . /var/www/html

# Configure apache
RUN a2enmod php7.0
RUN a2enmod rewrite
RUN chown -R www-data:www-data /var/www/html/backend/runtime /var/www/html/backend/web/assets /var/www/html/uploads
RUN sed -i '/<Directory \/var\/www\/>/,/<\/Directory>/ s/AllowOverride None/AllowOverride All/' /etc/apache2/apache2.conf

ENV APACHE_RUN_USER www-data
ENV APACHE_RUN_GROUP www-data
ENV APACHE_LOG_DIR /var/log/apache2
ENV APACHE_LOCK_DIR /var/lock/apache2
ENV APACHE_PID_FILE /var/run/apache2.pidd
ENV test myenv_variable_value

EXPOSE 80

RUN service apache2 start

CMD ["apache2", "-D", "FOREGROUND"]

While I can easily print APACHE_PID_FILE but when I tried test its not working. here is my PHP method

<?php
    getenv('APACHE_PID_FILE');
    $_ENV['test']
    getenv('test');
?>

These both method are not working in case of test env.

Thanks

the snippet is incomplete and will not work, can you post the real snippet? What is the output of print_r($_ENV);? — ivoba
– ivoba, Commented Aug 25, 2017 at 7:30

Tarun Lalwani · Accepted Answer · 2017-08-25 07:30:17Z

2

The problem is Apache doesn't expose environment variables which apache was launched with. You need to expose these environment variable using your config. Apache has a PassEnv directive that you need to use

https://httpd.apache.org/docs/current/mod/mod_env.html

PassEnv test

This will pass the environment test to your page. You need it for do it for every environment you want to expose.

answered Aug 25, 2017 at 7:30

Tarun Lalwani

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4 Comments

Tarun Lalwani Over a year ago

What version of apache?

Developer Over a year ago

check the version Server version: Apache/2.4.18 (Ubuntu) Server built: 2017-07-27T14:34:01

Tarun Lalwani Over a year ago

This need to go inside your apache config httpd.conf or apache2.conf based on the distribution and NOT in your Dockerfile or any command.

Tarun Lalwani Over a year ago

That is because Apache only allows certain environment variables to be exposed by default, that is why they work. It won't allow any other environment variable until unless you config tells it to have one. Makes sense?

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