We cover the docker logs command. We need to make a tweak so everything outputs to stdout or stderr. If we do that successfully, we can use Docker's logging mechanism to see output from Nginx, PHP, and Supervisord.

The only change we need to make:

PHP-FPM

In our php-fpm.conf file, adjust the error_log to error_log = /proc/self/fd/2.

Nginx

Nginx is easier - we can just adjust the Dockerfile by symlinking the nginx error and access logs to stdout and stderr:

FROM ubuntu:18.04

LABEL maintainer="Chris Fidao"

ENV DEBIAN_FRONTEND=noninteractive

RUN apt-get update \
    && apt-get install -y gnupg tzdata \
    && echo "UTC" > /etc/timezone \
    && dpkg-reconfigure -f noninteractive tzdata

RUN apt-get update \
    && apt-get install -y curl zip unzip git supervisor sqlite3 \
       nginx php7.2-fpm php7.2-cli \
       php7.2-pgsql php7.2-sqlite3 php7.2-gd \
       php7.2-curl php7.2-memcached \
       php7.2-imap php7.2-mysql php7.2-mbstring \
       php7.2-xml php7.2-zip php7.2-bcmath php7.2-soap \
       php7.2-intl php7.2-readline php7.2-xdebug \
       php-msgpack php-igbinary \
    && php -r "readfile('http://getcomposer.org/installer');" | php -- --install-dir=/usr/bin/ --filename=composer \
    && mkdir /run/php \
    && apt-get -y autoremove \
    && apt-get clean \
    && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* \
    && echo "daemon off;" >> /etc/nginx/nginx.conf

RUN ln -sf /dev/stdout /var/log/nginx/access.log \
    && ln -sf /dev/stderr /var/log/nginx/error.log

ADD default /etc/nginx/sites-available/default
ADD supervisord.conf /etc/supervisor/conf.d/supervisord.conf
ADD php-fpm.conf /etc/php/7.2/fpm/php-fpm.conf

CMD ["nginx"]

And of course, we need to rebuild the image:

docker build -t shippingdocker/app:latest \
    -f docker/app/Dockerfile \
    docker/app