From 4616e42ca6f181f15587ffbe49eb8f280ca94f5c Mon Sep 17 00:00:00 2001
From: Min RK <benjaminrk@gmail.com>
Date: Fri, 6 Mar 2015 16:28:31 -0800
Subject: [PATCH] die on failed startup

when init, start were made async, the eventloop would continue to run after an exception
---
 jupyterhub/app.py | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/jupyterhub/app.py b/jupyterhub/app.py
index 269b3dc2..90a6a8fd 100644
--- a/jupyterhub/app.py
+++ b/jupyterhub/app.py
@@ -1011,8 +1011,12 @@ class JupyterHub(Application):
     
     @gen.coroutine
     def launch_instance_async(self, argv=None):
-        yield self.initialize(argv)
-        yield self.start()
+        try:
+            yield self.initialize(argv)
+            yield self.start()
+        except Exception as e:
+            self.log.exception("")
+            self.exit(1)
     
     @classmethod
     def launch_instance(cls, argv=None):