Added ENV VAR setting for which port to run, flarum on inside the container. (#45)

Dockerfile

@@ -17,7 +17,8 @@ ENV GID=991 \
     FLARUM_TITLE=Docker-Flarum \
     DEBUG=false \
     LOG_TO_STDOUT=false \
-    GITHUB_TOKEN_AUTH=false
+    GITHUB_TOKEN_AUTH=false \
+    FLARUM_PORT=8888
 
 RUN apk add --no-progress --no-cache \
     nginx \
@@ -25,6 +26,7 @@ RUN apk add --no-progress --no-cache \
     su-exec \
     curl \
     git \
+    libcap \
     php7 \
     php7-fileinfo \
     php7-phar \
@@ -57,6 +59,6 @@ RUN apk add --no-progress --no-cache \
 
 COPY rootfs /
 RUN chmod +x /usr/local/bin/* /services/*/run /services/.s6-svscan/*
+RUN setcap CAP_NET_BIND_SERVICE=+eip /usr/sbin/nginx
 VOLUME /flarum/app/extensions /etc/nginx/conf.d
-EXPOSE 8888
 CMD ["/usr/local/bin/startup"]

README.md

@@ -25,7 +25,7 @@ Simple forum software for building great communities. https://flarum.org/
 
 ### Ports
 
-- **8888**
+- Default: **8888** (configurable)
 
 ### Volume
 
@@ -47,6 +47,7 @@ Simple forum software for building great communities. https://flarum.org/
 | **DB_PASS** | MariaDB database password | **required** | none
 | **DB_PREF** | Flarum tables prefix | *optional* | none
 | **DB_PORT** | MariaDB database port | *optional* | 3306
+| **FLARUM_PORT** | Port to run Flarum on inside the container | *optional* | 8888
 | **UPLOAD_MAX_SIZE** | The maximum size of an uploaded file | *optional* | 50M
 | **PHP_MEMORY_LIMIT** | PHP memory limit | *optional* | 128M |
 | **OPCACHE_MEMORY_LIMIT** | OPcache memory size in megabytes | *optional* | 128

rootfs/etc/nginx/nginx.conf

@@ -53,7 +53,7 @@ http {
     image/svg+xml;
 
   server {
-    listen 8888;
+    listen <FLARUM_PORT>;
     charset utf-8;
 
     root /flarum/app/public;

rootfs/usr/local/bin/startup

@@ -12,6 +12,7 @@ if [ -z "${FORUM_URL}" ]; then
 fi
 
 # Set file config for nginx and php
+sed -i "s/<FLARUM_PORT>/${FLARUM_PORT}/g" /etc/nginx/nginx.conf
 sed -i "s/<UPLOAD_MAX_SIZE>/${UPLOAD_MAX_SIZE}/g" /etc/nginx/nginx.conf /etc/php7/php-fpm.conf
 sed -i "s/<PHP_MEMORY_LIMIT>/${PHP_MEMORY_LIMIT}/g" /etc/php7/php-fpm.conf
 sed -i "s/<OPCACHE_MEMORY_LIMIT>/${OPCACHE_MEMORY_LIMIT}/g" /etc/php7/conf.d/00_opcache.ini