Docker-compose: Set a variable in env file and use it in Dockerfile

Question

I'm using Docker and Docker-compose to build a stack of nginx+php.

I'm trying to set the timezone in my .env file and use it in a Dockerfile, but I might be missunderstanding something from the documentation.

.env

# Timezone
TIMEZONE=Europe/Madrid

docker-compose.yml

version '2'

services:
    php:
        build: php7-fpm
        volumes:
            - ${APP_PATH}:/var/www/app
            - ./logs:/var/www/logs
        environment:
            TIMEZONE: ${TIMEZONE}

#[...more.stuff...]

php7-fpm/Dockerfile

FROM php:7.0-fpm
ARG TIMEZONE

#[...more.stuff...]

ENV TIMEZONE=${TIMEZONE}
RUN ln -snf /usr/share/zoneinfo/$TIMEZONE /etc/localtime && echo $TIMEZONE > /etc/timezone
RUN printf '[PHP]\ndate.timezone = "%s"\n', $TIMEZONE > /usr/local/etc/php/conf.d/tzone.ini

The timezone is not set properly inside the container (running php --info | grep timezone inside the php container bash). If I write the zone manually in the Dockerfile, it works.

The timezone is not set properly inside the container. If I write the zone manually in the Dockerfile, it works. — CarlosAS
– CarlosAS, Commented Aug 22, 2017 at 10:03

CarlosAS · Accepted Answer · 2017-08-22 11:32:40Z

7

You need to pass the build argument in docker compose

version '2'

services:
    php:
        build: 
          dockerfile: php7-fpm
          args:
            TIMEZONE: ${TIMEZONE}
        volumes:
            - ${APP_PATH}:/var/www/app
            - ./logs:/var/www/logs

The environment are passed to the running container and not to the buildfile. For the you need to pass args in the build section

edited Aug 22, 2017 at 11:32

CarlosAS

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answered Aug 22, 2017 at 10:16

Tarun Lalwani

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6 Comments

Tarun Lalwani Over a year ago

Yes, you can even pass those using docker-compose, see the compose file in my answer

omu_negru Over a year ago

i meant passing --build-arg at the docker build step, since he makes use of those before actually running the app (or at least that's how it looks to me)

Tarun Lalwani Over a year ago

With build: php7-fpm in the compose file. It means that docker-compose is building the image also

omu_negru Over a year ago

oh, missed that part. Thanks, i don't usually include a build step in my compose files

CarlosAS Over a year ago

Clear now, thanks! By the way I think the parameter environment is not longer necessary.

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