fix: remove empty routers/services traefik config instead of writing invalid yaml

Attaching Basic Auth or a Redirect to an application with no domains
wrote an empty routers/services block to the app's dynamic config
file. Traefik's file provider rejects that as invalid and aborts its
watcher, blocking config updates for every other application.

Fixes #5189

apps/dokploy/__test__/traefik/write-app-traefik-config.test.ts

@@ -0,0 +1,104 @@
+import fs from "node:fs";
+import os from "node:os";
+import path from "node:path";
+import { writeAppTraefikConfig } from "@dokploy/server/utils/traefik/application";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+
+const mocks = vi.hoisted(() => ({
+	execAsyncRemote: vi.fn(),
+}));
+
+vi.mock("@dokploy/server/utils/process/execAsync", async (importOriginal) => {
+	const actual =
+		await importOriginal<typeof import("@dokploy/server/utils/process/execAsync")>();
+	return {
+		...actual,
+		execAsyncRemote: mocks.execAsyncRemote,
+	};
+});
+
+describe("writeAppTraefikConfig", () => {
+	let cwd: string;
+	let dynamicPath: string;
+
+	beforeEach(() => {
+		cwd = fs.mkdtempSync(path.join(os.tmpdir(), "dokploy-traefik-"));
+		dynamicPath = path.join(cwd, ".docker", "traefik", "dynamic");
+		fs.mkdirSync(dynamicPath, { recursive: true });
+		vi.spyOn(process, "cwd").mockReturnValue(cwd);
+		vi.clearAllMocks();
+	});
+
+	afterEach(() => {
+		vi.restoreAllMocks();
+		fs.rmSync(cwd, { recursive: true, force: true });
+	});
+
+	// Regression test for #5189: Traefik's file provider rejects a standalone
+	// `routers: {}` / `services: {}` map and aborts its watcher for every
+	// dynamic config once it hits one, so an app with no domains must never
+	// get an on-disk config file at all.
+	it("removes the file instead of writing empty routers/services", async () => {
+		const appName = "no-domain-app";
+		const configPath = path.join(dynamicPath, `${appName}.yml`);
+		fs.writeFileSync(configPath, "stale content", "utf8");
+
+		await writeAppTraefikConfig(
+			{ http: { routers: {}, services: {} } },
+			appName,
+		);
+
+		expect(fs.existsSync(configPath)).toBe(false);
+	});
+
+	it("writes the file when routers/services are present", async () => {
+		const appName = "with-domain-app";
+		const configPath = path.join(dynamicPath, `${appName}.yml`);
+
+		await writeAppTraefikConfig(
+			{
+				http: {
+					routers: { [`${appName}-router-1`]: { rule: "Host(`x`)" } },
+					services: {},
+				},
+			},
+			appName,
+		);
+
+		expect(fs.existsSync(configPath)).toBe(true);
+	});
+
+	it("removes the remote file instead of writing empty routers/services", async () => {
+		mocks.execAsyncRemote.mockResolvedValue({ stdout: "", stderr: "" });
+
+		await writeAppTraefikConfig(
+			{ http: { routers: {}, services: {} } },
+			"no-domain-app",
+			"server-id",
+		);
+
+		expect(mocks.execAsyncRemote).toHaveBeenCalledOnce();
+		const [, command] = mocks.execAsyncRemote.mock.calls[0];
+		expect(command).toMatch(/^rm -f /);
+		expect(command).toContain("no-domain-app.yml");
+	});
+
+	it("writes the remote file when routers/services are present", async () => {
+		mocks.execAsyncRemote.mockResolvedValue({ stdout: "", stderr: "" });
+
+		await writeAppTraefikConfig(
+			{
+				http: {
+					routers: { "with-domain-app-router-1": { rule: "Host(`x`)" } },
+					services: {},
+				},
+			},
+			"with-domain-app",
+			"server-id",
+		);
+
+		expect(mocks.execAsyncRemote).toHaveBeenCalledOnce();
+		const [, command] = mocks.execAsyncRemote.mock.calls[0];
+		expect(command).toMatch(/^echo /);
+	});
+});

packages/server/src/utils/traefik/application.ts

@@ -292,6 +292,26 @@ export const writeTraefikConfigRemote = async (
 	}
 };
 
+const isEmptyHttpRoutersAndServices = (traefikConfig: FileConfig) =>
+	Object.keys(traefikConfig.http?.routers || {}).length === 0 &&
+	Object.keys(traefikConfig.http?.services || {}).length === 0;
+
+export const writeAppTraefikConfig = async (
+	traefikConfig: FileConfig,
+	appName: string,
+	serverId?: string | null,
+) => {
+	if (isEmptyHttpRoutersAndServices(traefikConfig)) {
+		await removeTraefikConfig(appName, serverId);
+		return;
+	}
+	if (serverId) {
+		await writeTraefikConfigRemote(traefikConfig, appName, serverId);
+	} else {
+		writeTraefikConfig(traefikConfig, appName);
+	}
+};
+
 export const createServiceConfig = (
 	appName: string,
 	domain: Domain,

packages/server/src/utils/traefik/redirect.ts

@@ -3,7 +3,7 @@ import type { ApplicationNested } from "../builders";
 import {
 	loadOrCreateConfig,
 	loadOrCreateConfigRemote,
-	writeTraefikConfig,
+	writeAppTraefikConfig,
 	writeTraefikConfigRemote,
 } from "./application";
 import type { FileConfig } from "./file-types";
@@ -89,11 +89,10 @@ export const createRedirectMiddleware = async (
 
 	if (serverId) {
 		await writeTraefikConfigRemote(config, "middlewares", serverId);
-		await writeTraefikConfigRemote(appConfig, appName, serverId);
 	} else {
 		writeMiddleware(config);
-		writeTraefikConfig(appConfig, appName);
 	}
+	await writeAppTraefikConfig(appConfig, appName, serverId);
 };
 
 export const removeRedirectMiddleware = async (
@@ -124,9 +123,8 @@ export const removeRedirectMiddleware = async (
 
 	if (serverId) {
 		await writeTraefikConfigRemote(config, "middlewares", serverId);
-		await writeTraefikConfigRemote(appConfig, appName, serverId);
 	} else {
-		writeTraefikConfig(appConfig, appName);
 		writeMiddleware(config);
 	}
+	await writeAppTraefikConfig(appConfig, appName, serverId);
 };

packages/server/src/utils/traefik/security.ts

@@ -4,7 +4,7 @@ import type { ApplicationNested } from "../builders";
 import {
 	loadOrCreateConfig,
 	loadOrCreateConfigRemote,
-	writeTraefikConfig,
+	writeAppTraefikConfig,
 	writeTraefikConfigRemote,
 } from "./application";
 import type {
@@ -62,11 +62,10 @@ export const createSecurityMiddleware = async (
 	addMiddleware(appConfig, middlewareName);
 	if (serverId) {
 		await writeTraefikConfigRemote(config, "middlewares", serverId);
-		await writeTraefikConfigRemote(appConfig, appName, serverId);
 	} else {
-		writeTraefikConfig(appConfig, appName);
 		writeMiddleware(config);
 	}
+	await writeAppTraefikConfig(appConfig, appName, serverId);
 };
 
 export const removeSecurityMiddleware = async (
@@ -89,6 +88,7 @@ export const removeSecurityMiddleware = async (
 		appConfig = loadOrCreateConfig(appName);
 	}
 	const middlewareName = `auth-${appName}`;
+	let removedLastUser = false;
 
 	if (config.http?.middlewares) {
 		const currentMiddleware = config.http.middlewares[middlewareName];
@@ -106,11 +106,7 @@ export const removeSecurityMiddleware = async (
 					delete config.http.middlewares[middlewareName];
 				}
 				deleteMiddleware(appConfig, middlewareName);
-				if (serverId) {
-					await writeTraefikConfigRemote(appConfig, appName, serverId);
-				} else {
-					writeTraefikConfig(appConfig, appName);
-				}
+				removedLastUser = true;
 			}
 		}
 	}
@@ -120,6 +116,9 @@ export const removeSecurityMiddleware = async (
 	} else {
 		writeMiddleware(config);
 	}
+	if (removedLastUser) {
+		await writeAppTraefikConfig(appConfig, appName, serverId);
+	}
 };
 
 const isBasicAuthMiddleware = (