Investigate increased CPU and memory usage for PHP containers in Live

Dockerfile

@@ -1,43 +1,48 @@
 FROM php:7.2-apache-stretch
 MAINTAINER Firespring "info.dev@firespring.com"
 
-ENV DEBIAN_FRONTEND noninteractive
-ENV SERVER_NAME=localhost
-ENV APACHE_RUN_USER=www-data
-ENV APACHE_RUN_GROUP=www-data
-ENV APACHE_PID_FILE=/var/run/apache2/apache2.pid
-ENV APACHE_RUN_DIR=/var/run/apache2
-ENV APACHE_LOCK_DIR=/var/lock/apache2
-ENV APACHE_LOG_DIR=/var/log/apache2
-ENV APACHE_LOG_LEVEL=warn
-ENV APACHE_CUSTOM_LOG_FILE=/proc/self/fd/1
-ENV APACHE_ERROR_LOG_FILE=/proc/self/fd/2
+ENV DEBIAN_FRONTEND="noninteractive" \
+    SERVER_NAME="localhost" \
+    APACHE_RUN_USER="www-data" \
+    APACHE_RUN_GROUP="www-data" \
+    APACHE_PID_FILE="/var/run/apache2/apache2.pid" \
+    APACHE_RUN_DIR="/var/run/apache2" \
+    APACHE_LOCK_DIR="/var/lock/apache2" \
+    APACHE_LOG_DIR="/var/log/apache2" \
+    APACHE_LOG_LEVEL="warn" \
+    APACHE_CUSTOM_LOG_FILE="/proc/self/fd/1" \
+    APACHE_ERROR_LOG_FILE="/proc/self/fd/2" \
+    PHP_OPCACHE_VALIDATE_TIMESTAMPS="0" \
+    PHP_OPCACHE_MAX_ACCELERATED_FILES="10000" \
+    PHP_OPCACHE_MEMORY_CONSUMPTION="192" \
+    PHP_OPCACHE_MAX_WASTED_PERCENTAGE="10"
 
 RUN mkdir -p /var/run/apache2 /var/lock/apache2
 
-RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get -y install apt-utils apt-transport-https software-properties-common gnupg
-
-RUN apt-get update && LC_ALL=C.UTF-8 add-apt-repository 'deb https://packages.sury.org/php/ stretch main' \
-    && apt-key adv --fetch-keys https://packages.sury.org/php/apt.gpg
-
-# Use the default production configuration
-# except Prioritize Sury php-gd package
-RUN set -eux; \
+RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get -y install apt-utils apt-transport-https software-properties-common gnupg \
+    && LC_ALL=C.UTF-8 add-apt-repository 'deb https://packages.sury.org/php/ stretch main' \
+    && apt-key adv --fetch-keys https://packages.sury.org/php/apt.gpg \
+    # Use the default production configuration
+    # except Prioritize Sury php-gd package
+    && set -eux; \
 	{ \
 		echo 'Package: php*-gd'; \
 		echo 'Pin: release *'; \
 		echo 'Pin-Priority: 1'; \
-	} >> /etc/apt/preferences.d/no-debian-php
-
-RUN apt-get update && apt-get install -y --force-yes \
+	} >> /etc/apt/preferences.d/no-debian-php \
+    && apt-get update && apt-get install -y --force-yes \
     # Apache\PHP
     php-mysql php-dev php-gd php-redis libhiredis-dev libhiredis0.13 libphp-predis \
-    libapache2-mod-gnutls php-zip php-cli php-xcache \
+    libapache2-mod-gnutls php-zip php-cli \
     # Build Deps
     build-essential curl make \
     # Other Deps
-    pdftk zip git libpng-dev libjpeg-dev libjpeg62-turbo-dev libfreetype6-dev libwebp-dev libxpm-dev
+    pdftk zip git libpng-dev libjpeg-dev libjpeg62-turbo-dev libfreetype6-dev libwebp-dev libxpm-dev \
+    # clean up packages here otherwise the files will be in every layer
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
 
+# install and configure php modules
 RUN pecl config-set php_ini "$PHP_INI_DIR" \
     && pear install PHP_CodeSniffer \
     && pecl install xdebug-2.6.1 \
@@ -47,6 +52,7 @@ RUN pecl config-set php_ini "$PHP_INI_DIR" \
     && docker-php-ext-enable redis \
     && docker-php-ext-install mysqli \
     && docker-php-ext-install zip \
+    && docker-php-ext-install opcache \
     && docker-php-ext-configure gd --with-freetype-dir=/usr/include/ --with-jpeg-dir=/usr/include/ \
     && docker-php-ext-install -j$(nproc) gd
 
@@ -70,15 +76,13 @@ RUN git clone https://github.com/nrk/phpiredis.git \
 
 RUN curl -sS https://getcomposer.org/installer | php && mv composer.phar /usr/local/bin/composer
 
-RUN apt-get clean \
-    && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
-
 # Apache Config
 ENV APACHE_LOCK_DIR /var/lock/apache2
 ENV APACHE_RUN_DIR /var/run/apache2
 ENV APPLICATION_ENV local
 
 COPY apache2/apache2.conf /etc/apache2/
+COPY php/conf.d/opcache.ini /usr/local/etc/php/conf.d/opcache.ini
 
 COPY apache2-foreground /usr/local/bin/
 

php/conf.d/opcache.ini

@@ -0,0 +1,11 @@
+[opcache]
+
+opcache.enable=1
+opcache.revalidate_freq=0
+opcache.validate_timestamps=${PHP_OPCACHE_VALIDATE_TIMESTAMPS}
+opcache.max_accelerated_files=${PHP_OPCACHE_MAX_ACCELERATED_FILES}
+opcache.memory_consumption=${PHP_OPCACHE_MEMORY_CONSUMPTION}
+opcache.max_wasted_percentage=${PHP_OPCACHE_MAX_WASTED_PERCENTAGE}
+opcache.interned_strings_buffer=16
+
+opcache.fast_shutdown=1