Added Docker files for all the containers.

Author: Pushpinder Rana

.env

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+APACHE_VERSION=2.4.41
+MYSQL_VERSION=8.0.0
+PHP_VERSION=7.3
+
+DB_NAME=drupal
+DB_USERNAME=drupal
+DB_PASSWORD=drupal123
+MYSQL_ROOT_PASSWORD=admin
+
+PROJECT_ROOT=./docroot

apache/Dockerfile

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+ARG APACHE_VERSION=""
+FROM httpd:${APACHE_VERSION:+${APACHE_VERSION}-}alpine
+
+RUN apk update; \
+    apk upgrade;
+
+# Copy apache vhost file to proxy php requests to php-fpm container
+COPY apache.conf /usr/local/apache2/conf/apache.conf
+RUN echo "Include /usr/local/apache2/conf/apache.conf" \
+    >> /usr/local/apache2/conf/httpd.conf

apache/apache.conf

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+ServerName localhost
+
+LoadModule deflate_module /usr/local/apache2/modules/mod_deflate.so
+LoadModule proxy_module /usr/local/apache2/modules/mod_proxy.so
+LoadModule proxy_fcgi_module /usr/local/apache2/modules/mod_proxy_fcgi.so
+LoadModule rewrite_module /usr/local/apache2/modules/mod_rewrite.so
+
+<VirtualHost *:80>
+    # Php requests to port 9000 of the php-fpm container
+    ProxyPassMatch ^/(.*\.php(/.*)?)$ fcgi://php:9000/var/www/html/$1
+    DocumentRoot /var/www/html/
+    <Directory /var/www/html/>
+        DirectoryIndex index.php
+        Options Indexes FollowSymLinks
+        AllowOverride All
+        Require all granted
+    </Directory>
+    
+    # Manage apache and error logs
+    ErrorLog /var/log/apache2/error.log
+</VirtualHost>

docker-compose.yml

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+version: "3.2"
+services:
+  php:
+    build: 
+      context: './php/'
+      args:
+       PHP_VERSION: ${PHP_VERSION}
+    networks:
+      - backend
+    volumes:
+      - ${PROJECT_ROOT}/:/var/www/html/
+    container_name: php
+  apache:
+    build:
+      context: './apache/'
+      args:
+       APACHE_VERSION: ${APACHE_VERSION}
+    depends_on:
+      - php
+      - mysql
+    networks:
+      - frontend
+      - backend
+    ports:
+      - "80:80"
+    volumes:
+      - ${PROJECT_ROOT}/:/var/www/html/
+    container_name: apache
+  mysql:
+    image: mysql:${MYSQL_VERSION:-latest}
+    restart: always
+    ports:
+      - "3306:3306"
+    volumes:
+            - data:/var/lib/mysql
+    networks:
+      - backend
+    environment:
+      MYSQL_ROOT_PASSWORD: "${DB_ROOT_PASSWORD}"
+      MYSQL_DATABASE: "${DB_NAME}"
+      MYSQL_USER: "${DB_USERNAME}"
+      MYSQL_PASSWORD: "${DB_PASSWORD}"
+    container_name: mysql
+networks:
+  frontend:
+  backend:
+volumes:
+    data:

docroot/index.php

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+<h1>Congratulations!! Docker setup connection is successful.</h1>
+
+<h4>Checking MySQL integration with php.</h4>
+<?php
+$host = 'mysql';
+$user = 'drupal';
+$pass = 'drupal123';
+$conn = new mysqli($host, $user, $pass);
+
+if ($conn->connect_error) {
+    die("MySql connection is failed: " . $conn->connect_error);
+} else {
+    echo "MySql connection is successful!";
+}
+
+echo phpinfo();
+
+?>

php/Dockerfile

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+ARG PHP_VERSION=""
+FROM php:${PHP_VERSION:+${PHP_VERSION}-}fpm-alpine
+
+RUN apk update; \
+    apk upgrade;
+
+# Install MySql
+RUN docker-php-ext-install mysqli
+
+RUN docker-php-ext-install mysqli pdo pdo_mysql
+
+# Install Composer
+RUN curl -sS https://getcomposer.org/installer | php && \
+    mv composer.phar /usr/local/bin/composer && \
+    ln -s /root/.composer/vendor/bin/drush /usr/local/bin/drush
+
+# Install Drush
+RUN composer global require drush/drush && \
+    composer global update 
+
+# PHP packages
+RUN apk add --update \
+        libressl \
+        ca-certificates \
+        openssh-client \
+        rsync \
+        git \
+        curl \
+        wget \
+        gzip \
+        tar \
+        patch \
+        perl \
+        pcre \
+        imap \
+        imagemagick \
+        mariadb-client \
+        build-base \
+        autoconf \
+        libtool \
+        php7-dev \
+        pcre-dev \
+        imagemagick-dev \
+        php7 \
+        php7-fpm \
+        php7-opcache \
+        php7-session \
+        php7-dom \
+        php7-xml \
+        php7-xmlreader \
+        php7-ctype \
+        php7-ftp \
+        php7-gd \
+        php7-json \
+        php7-posix \
+        php7-curl \
+        php7-pdo \
+        php7-pdo_mysql \
+        php7-sockets \
+        php7-zlib \
+        php7-mcrypt \
+        php7-mysqli \
+        php7-sqlite3 \
+        php7-bz2 \
+        php7-phar \
+        php7-openssl \
+        php7-posix \
+        php7-zip \
+        php7-calendar \
+        php7-iconv \
+        php7-imap \
+        php7-soap \
+        php7-dev \
+        php7-pear \
+        php7-redis \
+        php7-mbstring \
+        php7-xdebug \
+        php7-exif \
+        php7-xsl \
+        php7-ldap \
+        php7-bcmath \
+        php7-memcached \
+        php7-oauth \
+        php7-apcu