From 1f7f722238ed4c9c14b05f5c8b72dcbfb9b6ec7a Mon Sep 17 00:00:00 2001
From: fullsizemalt <106900403+fullsizemalt@users.noreply.github.com>
Date: Fri, 9 Jan 2026 01:44:39 -0800
Subject: [PATCH] Fix nginx DNS resolver for Docker upstream

Use Docker internal DNS resolver and variable for backend upstream
to prevent nginx from failing to resolve hostname during config reload.
---
 frontend/nginx.conf | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/frontend/nginx.conf b/frontend/nginx.conf
index 91d62b4..c212adb 100644
--- a/frontend/nginx.conf
+++ b/frontend/nginx.conf
@@ -4,9 +4,13 @@ server {
     root /usr/share/nginx/html;
     index index.html;
 
+    # DNS resolver for Docker
+    resolver 127.0.0.11 valid=30s;
+
     # API proxy
     location /api {
-        proxy_pass http://veridian-preview-backend:3000;
+        set $backend_upstream "veridian-preview-backend:3000";
+        proxy_pass http://$backend_upstream;
         proxy_http_version 1.1;
         proxy_set_header Upgrade $http_upgrade;
         proxy_set_header Connection 'upgrade';