option to override nginx resolver

README.md

@@ -87,6 +87,8 @@ docker run -it \
 
 `REDIS_PORT` - If using the redis adapter; the redis port. Defaults to 6379
 
+`RESOLVER` - Nginx resolver. Useful for cases where we need to connect by hostname to a local redis server. Defaults to 8.8.8.8
+
 
 ## Advanced
 Say we want to proxy a local Django server, then, in the Django project

nginx.conf

@@ -20,7 +20,7 @@ http {
   # default DNS servers, which can be found in /etc/resolv.conf. If your network
   # is not IPv6 compatible, you may wish to disable IPv6 results by using the
   # "ipv6=off" flag (like "resolver 8.8.8.8 ipv6=off").
-  resolver 8.8.8.8;
+  resolver {{ RESOLVER }};
 
   # Initial setup tasks.
   init_by_lua_block {

setup.sh

@@ -15,6 +15,12 @@ if [[ -z "${STORAGE_ADAPTER}" ]]; then
   STORAGE_ADAPTER="file"
 fi
 
+if [[ -z "${RESOLVER}" ]]; then
+  # Should be one of 'file' or 'redis'
+  echo "RESOLVER env not provided. Defaulting to 8.8.8.8."
+  RESOLVER="8.8.8.8"
+fi
+
 if [ "${STORAGE_ADAPTER}" == "redis" ]; then
   if [[ -z "${REDIS_HOST}" ]]; then
     echo "REDIS_HOST env is required if using redis storage adapter."
@@ -35,6 +41,7 @@ fi
 sed -i -e "s/{{ DNS_DOMAIN }}/${DNS_DOMAIN//\//\\/}/g" /usr/local/openresty/nginx/conf/nginx.conf
 sed -i -e "s/{{ PROXY_PASS }}/${PROXY_PASS//\//\\/}/g" /usr/local/openresty/nginx/conf/nginx.conf
 sed -i -e "s/{{ STORAGE_ADAPTER }}/${STORAGE_ADAPTER}/g" /usr/local/openresty/nginx/conf/nginx.conf
+sed -i -e "s/{{ RESOLVER }}/${RESOLVER}/g" /usr/local/openresty/nginx/conf/nginx.conf
 sed -i -e "s/{{ REDIS_HOST }}/${REDIS_HOST//\//\\/}/g" /usr/local/openresty/nginx/conf/nginx.conf
 sed -i -e "s/{{ REDIS_PORT }}/${REDIS_PORT}/g" /usr/local/openresty/nginx/conf/nginx.conf