fix: gracefully handle comments in resolv.conf. Fixes #171

common/docker-entrypoint.sh

@@ -32,16 +32,11 @@ parseBoolean() {
 
 # This line is an addition to the NGINX Docker image's entrypoint script.
 if [ -z ${DNS_RESOLVERS+x} ]; then
-  resolvers=""
-  for ip in $(grep nameserver /etc/resolv.conf | cut -d' ' -f2 | xargs)
-  do
-    if echo "${ip}" | grep -q ':'; then
-      resolvers="$resolvers [${ip}]"
-    else
-      resolvers="$resolvers $ip"
-    fi
-  done
-  export DNS_RESOLVERS="${resolvers}"
+   # This method of pulling individual nameservers from
+   # /etc/resolv.conf taken from the entrypoint script in the
+   # official docker image.
+   # https://github.com/nginxinc/docker-nginx/blob/master/entrypoint/15-local-resolvers.envsh
+  export DNS_RESOLVERS="$(awk 'BEGIN{ORS=" "} $1=="nameserver" {print $2}' /etc/resolv.conf)"
 fi
 
 # Normalize the CORS_ENABLED environment variable to a numeric value