diff --git a/src/od_instance.c b/src/od_instance.c
index 33101626..f3a45e9e 100644
--- a/src/od_instance.c
+++ b/src/od_instance.c
@@ -41,6 +41,7 @@
 
 #include "od_router.h"
 #include "od_pooler.h"
+#include "od_periodic.h"
 #include "od_relay.h"
 #include "od_relay_pool.h"
 #include "od_frontend.h"
@@ -142,13 +143,14 @@ int od_instance_main(od_instance_t *instance, int argc, char **argv)
 		od_pid_create(&instance->pid, instance->scheme.pid_file);
 
 	/* run system services */
-	od_pooler_t pooler;
 	od_router_t router;
+	od_periodic_t periodic;
+	od_pooler_t pooler;
 	od_relaypool_t relay_pool;
-
 	od_system_t system = {
 		.pooler     = &pooler,
 		.router     = &router,
+		.periodic   = &periodic,
 		.relay_pool = &relay_pool,
 		.instance   = instance
 	};
@@ -157,17 +159,18 @@ int od_instance_main(od_instance_t *instance, int argc, char **argv)
 		od_error(&instance->log, "failed to create task queue");
 		return 1;
 	}
-
 	od_router_init(&router, &system);
+	od_periodic_init(&periodic, &system);
 	od_pooler_init(&pooler, &system);
-
-	rc = od_pooler_start(&pooler);
-	if (rc == -1)
-		return 1;
-
 	rc = od_relaypool_init(&relay_pool, &system, instance->scheme.workers);
 	if (rc == -1)
 		return 1;
+
+	/* start pooler machine thread */
+	rc = od_pooler_start(&pooler);
+	if (rc == -1)
+		return 1;
+	/* start workers */
 	rc = od_relaypool_start(&relay_pool);
 	if (rc == -1)
 		return 1;
diff --git a/src/od_periodic.c b/src/od_periodic.c
index 58fff311..538df131 100644
--- a/src/od_periodic.c
+++ b/src/od_periodic.c
@@ -99,10 +99,12 @@ od_expire_mark(od_server_t *server, void *arg)
 	return 0;
 }
 
-void od_periodic(void *arg)
+static void
+od_periodic(void *arg)
 {
-	od_router_t *router = arg;
-	od_instance_t *instance = router->system->instance;
+	od_periodic_t *periodic = arg;
+	od_router_t *router = periodic->system->router;
+	od_instance_t *instance = periodic->system->instance;
 
 	int tick = 0;
 	for (;;)
@@ -177,3 +179,21 @@ void od_periodic(void *arg)
 		machine_sleep(1000);
 	}
 }
+
+int od_periodic_init(od_periodic_t *periodic, od_system_t *system)
+{
+	periodic->system = system;
+	return 0;
+}
+
+int od_periodic_start(od_periodic_t *periodic)
+{
+	od_instance_t *instance = periodic->system->instance;
+	int64_t coroutine_id;
+	coroutine_id = machine_coroutine_create(od_periodic, periodic);
+	if (coroutine_id == -1) {
+		od_error(&instance->log, "failed to start router");
+		return 1;
+	}
+	return 0;
+}
diff --git a/src/od_periodic.h b/src/od_periodic.h
index 836ecfb6..4f7ed452 100644
--- a/src/od_periodic.h
+++ b/src/od_periodic.h
@@ -7,6 +7,13 @@
  * PostgreSQL connection pooler and request router.
 */
 
-void od_periodic(void*);
+typedef struct od_periodic_t od_periodic_t;
+
+struct od_periodic_t {
+	od_system_t *system;
+};
+
+int od_periodic_init(od_periodic_t*, od_system_t*);
+int od_periodic_start(od_periodic_t*);
 
 #endif /* OD_PERIODIC_H */
diff --git a/src/od_pooler.c b/src/od_pooler.c
index a9b3094b..4675e094 100644
--- a/src/od_pooler.c
+++ b/src/od_pooler.c
@@ -38,23 +38,14 @@
 #include "od_route_pool.h"
 #include "od_router.h"
 #include "od_pooler.h"
+#include "od_periodic.h"
 #include "od_tls.h"
 
 static inline void
-od_pooler(void *arg)
+od_pooler_main(od_pooler_t *pooler)
 {
-	od_pooler_t *pooler = arg;
-	od_router_t *router = pooler->system->router;
 	od_instance_t *instance = pooler->system->instance;
 
-	od_log(&instance->log, "pooler: started");
-
-	/* start router coroutine */
-	int rc;
-	rc = od_router_start(router);
-	if (rc == -1)
-		return;
-
 	/* init pooler tls */
 	pooler->tls = NULL;
 	od_scheme_t *scheme = &instance->scheme;
@@ -85,6 +76,7 @@ od_pooler(void *arg)
 	char port[16];
 	snprintf(port, sizeof(port), "%d", instance->scheme.port);
 	struct addrinfo *ai = NULL;
+	int rc;
 	rc = machine_getaddrinfo(host, port, hints_ptr, &ai, UINT32_MAX);
 	if (rc < 0) {
 		od_error(&instance->log, "failed to resolve %s:%d",
@@ -170,6 +162,33 @@ od_pooler(void *arg)
 	}
 }
 
+static inline void
+od_pooler(void *arg)
+{
+	od_pooler_t *pooler = arg;
+	od_instance_t *instance = pooler->system->instance;
+
+	od_log(&instance->log, "pooler: started");
+
+	/* start router coroutine */
+	int rc;
+	od_router_t *router;
+	router = pooler->system->router;
+	rc = od_router_start(router);
+	if (rc == -1)
+		return;
+
+	/* start periodic coroutine */
+	od_periodic_t *periodic;
+	periodic = pooler->system->periodic;
+	rc = od_periodic_start(periodic);
+	if (rc == -1)
+		return;
+
+	/* start pooler server */
+	od_pooler_main(pooler);
+}
+
 int od_pooler_init(od_pooler_t *pooler, od_system_t *system)
 {
 	pooler->machine = -1;
diff --git a/src/od_router.c b/src/od_router.c
index a5b76d1f..2950ed21 100644
--- a/src/od_router.c
+++ b/src/od_router.c
@@ -160,14 +160,6 @@ od_router(void *arg)
 
 	od_log(&instance->log, "router: started");
 
-	/* start periodic task coroutine */
-	int64_t coroutine_id;
-	coroutine_id = machine_coroutine_create(od_periodic, router);
-	if (coroutine_id == -1) {
-		od_error(&instance->log, "failed to create periodic coroutine");
-		return;
-	}
-
 	for (;;)
 	{
 		machine_msg_t msg;
@@ -240,6 +232,7 @@ od_router(void *arg)
 			od_msgrouter_t *msg_attach;
 			msg_attach = machine_msg_get_data(msg);
 
+			int64_t coroutine_id;
 			coroutine_id = machine_coroutine_create(od_router_attacher, msg);
 			if (coroutine_id == -1) {
 				msg_attach->status = OD_RERROR;
diff --git a/src/od_system.h b/src/od_system.h
index 7d77e8bf..2b3617cb 100644
--- a/src/od_system.h
+++ b/src/od_system.h
@@ -14,6 +14,7 @@ struct od_system
 	void *instance;
 	void *pooler;
 	void *router;
+	void *periodic;
 	void *relay_pool;
 	machine_queue_t task_queue;
 };