Switch from hardcoding quad9 to reading resolv.conf

docker/nginx.conf.d/default.conf.tpl

@@ -74,7 +74,7 @@ server {
         internal;
 
         # Reconstruct the remote URL
-        resolver 9.9.9.9 149.112.112.112 ipv6=off;
+        resolver __NAMESERVER__ valid=10s;
 
         # Unset Authorization and Cookie for security reasons.
         proxy_set_header Authorization '';

docker/run.sh

@@ -1,8 +1,12 @@
 #!/bin/bash
 
-# Set up cache size
+# Set up cache size and nameserver subs
 CACHE_SIZE="${TAKAHE_NGINX_CACHE_SIZE:-1g}"
-sed s/__CACHESIZE__/${CACHE_SIZE}/g /etc/nginx/conf.d/default.conf.tpl > /etc/nginx/conf.d/default.conf
+NAMESERVER=`cat /etc/resolv.conf | grep "nameserver" | awk '{print $2}' | tr '\n' ' '`
+if [ -z "$NAMESERVER" ]; then
+    NAMESERVER="9.9.9.9 149.112.112.112"
+fi
+sed "s/__CACHESIZE__/${CACHE_SIZE}/g" /etc/nginx/conf.d/default.conf.tpl | sed "s/__NAMESERVER__/${NAMESERVER}/g" > /etc/nginx/conf.d/default.conf
 
 # Run nginx and gunicorn
 nginx &