Ubuntu vs Alpine as base image

[Rozkalns]

Do you have in mind to update this course using Alpine as base image?
Or what is the reason why you choose to use Ubuntu in first place?

I followed your course, but I wanted to make it with Alpine as base, I had some trouble with PHP-FPM and Nginx configuration, so I found some DockerImages online, slapped things together, and at least PHP with Nginx now works :)

FROM alpine:3.8

MAINTAINER Roberts Rozkalns

RUN apk add --no-cache \
    gnupg tzdata \
    && ln -snf /usr/share/zoneinfo/UTC /etc/localtime \
    && echo "UTC" > /etc/timezone \
    && apk del tzdata

RUN apk add --no-cache \
    curl zip unzip git supervisor sqlite \
    nginx php7-fpm php7-cli \
    php7-pgsql php7-sqlite3 php7-gd \
    php7-curl php7-memcached \
    php7-imap php7-pdo php7-pdo_mysql php7-mbstring \
    php7-xml php7-zip php7-bcmath php7-soap \
    php7-intl php7-xdebug \
    php7-phar php7-json \
    && php -r "readfile('http://getcomposer.org/installer');" | php -- --install-dir=/usr/bin/ --filename=composer \
    && for dir in php nginx; do mkdir -p /run/${dir}; done

# Add user
RUN set -x ; \
  addgroup -g 82 -S www-data ; \
  adduser -u 82 -D -S -G www-data www-data

# Nginx configuration
RUN rm /etc/nginx/conf.d/*
ADD nginx.conf /etc/nginx/nginx.conf
ADD nginx-vhost.conf /etc/nginx/sites-enabled/app.conf

# PHP configuration
ADD php-env-vars.conf /etc/php7/php-env-vars.conf
ADD php-fpm.conf /etc/php7/php-fpm.conf
ADD php.ini /etc/php7/php.ini

# Supervisord configuration
ADD supervisord.conf /etc/supervisor/conf.d/supervisord.conf

CMD ["supervisord", "-c", "/etc/supervisor/conf.d/supervisord.conf"]

So, basically, biggest differences were that I needed to create additional nginx directory in /run because it was failing, and then alpine nginx does not come with sites-enabled directory because it is more or less debian thing. As well as php-fpm config seems to be a bit different than it is on Ubuntu, so I needed to add this custom thing as well. And Supervisor config also stays in different place by default, so needed to change that as well.
As well as, this is sh and ash shell thing, but mkdir -p /run/{nginx,php} does not work with these shells as we are used to do with bash