Switched to Alpine Linux for a smaller footprint

Dockerfile

@@ -1,26 +1,17 @@
-FROM php:7.0-fpm
+FROM alpine:latest
 
-# Install Nginx
-ENV NGINX_VERSION 1.9.11-1~jessie
-
-RUN apt-key adv --keyserver hkp://pgp.mit.edu:80 --recv-keys 573BFD6B3D8FBC641079A6ABABF5BD827BD9BF62 \
-	&& echo "deb http://nginx.org/packages/mainline/debian/ jessie nginx" >> /etc/apt/sources.list \
-	&& apt-get update \
-	&& apt-get install -y ca-certificates nginx=${NGINX_VERSION} gettext-base \
-	&& rm -rf /var/lib/apt/lists/*
-
-# Install supervisor
-RUN apt-get update && apt-get install -y supervisor
+# Install packages
+RUN apk --update add php7-fpm nginx supervisor --repository http://nl.alpinelinux.org/alpine/edge/testing/
 
 # Configure nginx
-RUN rm /etc/nginx/conf.d/default.conf
-COPY config/nginx.conf /etc/nginx/conf.d/nginx.conf
-
-# Configure supervisor
-COPY config/supervisord.conf /etc/supervisor/conf.d/supervisord.conf
+COPY config/nginx.conf /etc/nginx/nginx.conf
 
 # Configure PHP-FPM
-COPY config/php.ini /usr/local/etc/php/conf.d/custom.ini
+COPY config/fpm-pool.conf /etc/php7/php-fpm.d/zzz_custom.conf
+COPY config/php.ini /etc/php7/conf.d/zzz_custom.ini
+
+# Configure supervisord
+COPY config/supervisord.conf /etc/supervisor/conf.d/supervisord.conf
 
 # Add application
 RUN mkdir -p /var/www/html
@@ -28,4 +19,4 @@ WORKDIR /var/www/html
 COPY src/ /var/www/html/
 
 EXPOSE 80 443
-CMD ["/usr/bin/supervisord"]
+CMD ["/usr/bin/supervisord", "-c", "/etc/supervisor/conf.d/supervisord.conf"]

config/fpm-pool.conf

@@ -0,0 +1,28 @@
+[www]
+; Enable status page
+pm.status_path = /fpm-status
+
+; Ondemand process manager
+pm = ondemand
+
+; The number of child processes to be created when pm is set to 'static' and the
+; maximum number of child processes when pm is set to 'dynamic' or 'ondemand'.
+; This value sets the limit on the number of simultaneous requests that will be
+; served. Equivalent to the ApacheMaxClients directive with mpm_prefork.
+; Equivalent to the PHP_FCGI_CHILDREN environment variable in the original PHP
+; CGI. The below defaults are based on a server without much resources. Don't
+; forget to tweak pm.* to fit your needs.
+; Note: Used when pm is set to 'static', 'dynamic' or 'ondemand'
+; Note: This value is mandatory.
+pm.max_children = 50
+
+; The number of seconds after which an idle process will be killed.
+; Note: Used only when pm is set to 'ondemand'
+; Default Value: 10s
+pm.process_idle_timeout = 10s;
+
+; The number of requests each child process should execute before respawning.
+; This can be useful to work around memory leaks in 3rd party libraries. For
+; endless request processing specify '0'. Equivalent to PHP_FCGI_MAX_REQUESTS.
+; Default Value: 0
+pm.max_requests = 500

config/nginx.conf

@@ -1,3 +1,15 @@
+worker_processes  1;
+
+events {
+    worker_connections  1024;
+}
+
+http {
+    include       mime.types;
+    default_type  application/octet-stream;
+
+    keepalive_timeout  65;
+
     server {
         listen [::]:80 default_server;
         listen 80 default_server;
@@ -47,3 +59,4 @@ server {
             deny all;
         }
     }
+}

config/supervisord.conf

@@ -2,7 +2,7 @@
 nodaemon=true
 
 [program:php-fpm]
-command=php-fpm
+command=php-fpm7 -F
 stdout_logfile=/dev/stdout
 stdout_logfile_maxbytes=0
 stderr_logfile=/dev/stderr