works eventually, still shaky

nginx-lb.conf

@@ -0,0 +1,43 @@
+upstream phoenix_backend {
+    # Hash based on WebSocket handshake key for sticky sessions
+    # Note: Each new connection gets a new key, so reconnections may route differently
+    hash $http_sec_websocket_key consistent;
+    
+    # Failover configuration: mark server as down after 3 failed attempts within 30s
+    # Server will be retried after 30s
+    server phoenix1:4000 max_fails=1 fail_timeout=30s;
+    server phoenix2:4000 max_fails=1 fail_timeout=30s;
+    server phoenix3:4000 max_fails=1 fail_timeout=30s;
+}
+
+server {
+    listen 80;
+    server_name localhost;
+
+    location /socket {
+        proxy_pass http://phoenix_backend;
+        proxy_http_version 1.1;
+        
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection "upgrade";
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+    }
+
+    location /api {
+        proxy_pass http://phoenix_backend;
+        proxy_http_version 1.1;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+    }
+
+    location /health {
+        access_log off;
+        return 200 "healthy\n";
+        add_header Content-Type text/plain;
+    }
+}