Dockerfile

FROM php:7.2-apache

RUN set -eux; \
	apt-get update; \
	apt-get install -y --no-install-recommends \
    # Ghostscript is required for rendering PDF previews
	ghostscript \
    mariadb-client \
    msmtp \
    msmtp-mta \
	; \
	rm -rf /var/lib/apt/lists/*

# install the PHP extensions we need (https://make.wordpress.org/hosting/handbook/handbook/server-environment/#php-extensions)
RUN set -ex; \
	\
	savedAptMark="$(apt-mark showmanual)"; \
	\
	apt-get update; \
	apt-get install -y --no-install-recommends \
		libfreetype6-dev \
		libicu-dev \
		libjpeg-dev \
		libmagickwand-dev \
		libpng-dev \
		libwebp-dev \
		libzip-dev \
	; \
	\
	docker-php-ext-configure gd \
    		--with-freetype-dir=/usr \
    		--with-jpeg-dir=/usr \
    		--with-png-dir=/usr \
    	; \
	docker-php-ext-install -j "$(nproc)" \
		bcmath \
		exif \
		gd \
		intl \
		mysqli \
		zip \
		soap \
	; \
    # https://pecl.php.net/package/imagick
	pecl install imagick-3.6.0; \
	docker-php-ext-enable imagick; \
	rm -r /tmp/pear; \
	\
    # some misbehaving extensions end up outputting to stdout 🙈 (https://github.com/docker-library/wordpress/issues/669#issuecomment-993945967)
	out="$(php -r 'exit(0);')"; \
	[ -z "$out" ]; \
	err="$(php -r 'exit(0);' 3>&1 1>&2 2>&3)"; \
	[ -z "$err" ]; \
	\
	extDir="$(php -r 'echo ini_get("extension_dir");')"; \
	[ -d "$extDir" ]; \
    # reset apt-mark's "manual" list so that "purge --auto-remove" will remove all build dependencies
	apt-mark auto '.*' > /dev/null; \
	apt-mark manual $savedAptMark; \
	ldd "$extDir"/*.so \
		| awk '/=>/ { so = $(NF-1); if (index(so, "/usr/local/") == 1) { next }; gsub("^/(usr/)?", "", so); print so }' \
		| sort -u \
		| xargs -r dpkg-query --search \
		| cut -d: -f1 \
		| sort -u \
		| xargs -rt apt-mark manual; \
	\
	apt-get purge -y --auto-remove -o APT::AutoRemove::RecommendsImportant=false; \
	rm -rf /var/lib/apt/lists/*; \
	\
	! { ldd "$extDir"/*.so | grep 'not found'; }; \
    # check for output like "PHP Warning:  PHP Startup: Unable to load dynamic library 'foo' (tried: ...)
	err="$(php --version 3>&1 1>&2 2>&3)"; \
	[ -z "$err" ]


# use production php.ini
RUN mv "$PHP_INI_DIR/php.ini-production" "$PHP_INI_DIR/php.ini"

# apply custom PHP configuration
COPY php-custom.ini "$PHP_INI_DIR/conf.d/zzz-custom-php.ini"

# set recommended PHP.ini settings
# see https://secure.php.net/manual/en/opcache.installation.php
RUN set -eux; \
	docker-php-ext-enable opcache; \
	{ \
		echo 'opcache.memory_consumption=128'; \
		echo 'opcache.interned_strings_buffer=8'; \
		echo 'opcache.max_accelerated_files=4000'; \
		echo 'opcache.revalidate_freq=2'; \
	} > /usr/local/etc/php/conf.d/opcache-recommended.ini

# https://wordpress.org/support/article/editing-wp-config-php/#configure-error-logging
RUN { \
        # https://www.php.net/manual/en/errorfunc.constants.php
        # https://github.com/docker-library/wordpress/issues/420#issuecomment-517839670
		echo 'error_reporting = E_ERROR | E_WARNING | E_PARSE | E_CORE_ERROR | E_CORE_WARNING | E_COMPILE_ERROR | E_COMPILE_WARNING | E_RECOVERABLE_ERROR'; \
		echo 'display_errors = Off'; \
		echo 'display_startup_errors = Off'; \
		echo 'log_errors = On'; \
		echo 'error_log = /dev/stderr'; \
		echo 'log_errors_max_len = 1024'; \
		echo 'ignore_repeated_errors = On'; \
		echo 'ignore_repeated_source = Off'; \
		echo 'html_errors = Off'; \
	} > /usr/local/etc/php/conf.d/error-logging.ini

RUN set -eux; \
	a2enmod rewrite expires; \
	\
    # https://httpd.apache.org/docs/2.4/mod/mod_remoteip.html
	a2enmod remoteip; \
	{ \
		echo 'RemoteIPHeader X-Forwarded-For'; \
        # these IP ranges are reserved for "private" use and should thus *usually* be safe inside Docker
		echo 'RemoteIPInternalProxy 10.0.0.0/8'; \
		echo 'RemoteIPInternalProxy 172.16.0.0/12'; \
		echo 'RemoteIPInternalProxy 192.168.0.0/16'; \
		echo 'RemoteIPInternalProxy 169.254.0.0/16'; \
		echo 'RemoteIPInternalProxy 127.0.0.0/8'; \
	} > /etc/apache2/conf-available/remoteip.conf; \
	a2enconf remoteip; \
    # https://github.com/docker-library/wordpress/issues/383#issuecomment-507886512
    # (replace all instances of "%h" with "%a" in LogFormat)
	find /etc/apache2 -type f -name '*.conf' -exec sed -ri 's/([[:space:]]*LogFormat[[:space:]]+"[^"]*)%h([^"]*")/\1%a\2/g' '{}' +

RUN echo "sendmail_path=/usr/bin/msmtp -t --read-envelope-from" > /usr/local/etc/php/conf.d/php-sendmail.ini

RUN set -eux; \
    { \
      echo 'account default'; \
      echo 'host relay.mailhub'; \
      echo 'port 25'; \
    } > /etc/msmtprc

WORKDIR /var/www/html

COPY --chown=www-data wp-config-docker.php /usr/src/wordpress/

CMD ["apache2-foreground"]