HOSTNAME: "0.0.0.0"

docker-compose.yml

@@ -52,6 +52,10 @@ services:
     restart: unless-stopped
     environment:
       NODE_ENV: production
+      # Docker sets HOSTNAME=<container-id>, and the Next.js standalone server binds to
+      # exactly that one interface - localhost (healthcheck) and the container's other
+      # network addresses then answer with ECONNREFUSED.
+      HOSTNAME: "0.0.0.0"
       DATABASE_URL: postgresql://${POSTGRES_USER}:${POSTGRES_PASSWORD}@db:5432/${POSTGRES_DB}?schema=public
       DIRECT_URL: postgresql://${POSTGRES_USER}:${POSTGRES_PASSWORD}@db:5432/${POSTGRES_DB}?schema=public
       REDIS_URL: redis://redis:6379