# 503 : service unavailable (services)

**URL:** <https://discourse.jupyter.org/t/503-service-unavailable-services/8681>\
**Category:** JupyterHub\
**Tags:** jupyterhub, help-wanted\
**Created:** [April 8, 2021, 1:50pm UTC](https://discourse.jupyter.org/t/503-service-unavailable-services/8681 "2021-04-08T13:50:08Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![SofianeB](https://yyz1.discourse-cdn.com/flex031/user_avatar/discourse.jupyter.org/sofianeb/32/4126_2.png) [@SofianeB](https://discourse.jupyter.org/u/SofianeB)\
**Post date:** [April 8, 2021, 1:50pm UTC](https://discourse.jupyter.org/t/503-service-unavailable-services/8681/1 "2021-04-08T13:50:08Z")

</div>

Hi,

I upgraded jupyterhub to 1.3.0 (jinja2 2.11.3), but all my services stopped showing up. For example the [jupyterhub\_announcement service](https://github.com/rcthomas/jupyterhub-announcement), I get `503 : service unavailable` and in the log file:

```auto
15:34:30.180 [ConfigProxy] debug: PROXY WEB /services/announcement/ to http://127.0.0.1:8888
jupyterhub[31684]: ERROR:tornado.application:Uncaught exception
jupyterhub[31684]: Traceback (most recent call last):
jupyterhub[31684]: File "/usr/local/lib64/python3.6/site-packages/tornado/http1connection.py", line 273, in _read_message
jupyterhub[31684]: delegate.finish()
jupyterhub[31684]: File "/usr/local/lib64/python3.6/site-packages/tornado/routing.py", line 268, in finish
jupyterhub[31684]: self.delegate.finish()
jupyterhub[31684]: File "/usr/local/lib64/python3.6/site-packages/tornado/web.py", line 2297, in finish
jupyterhub[31684]: self.execute()
jupyterhub[31684]: File "/usr/local/lib64/python3.6/site-packages/tornado/web.py", line 2317, in execute
jupyterhub[31684]: self.application, self.request, **self.handler_kwargs
jupyterhub[31684]: File "/usr/local/lib64/python3.6/site-packages/tornado/web.py", line 233, in __init__
jupyterhub[31684]: self.initialize(**kwargs) # type: ignore
jupyterhub[31684]: File "/usr/local/lib/python3.6/site-packages/jupyterhub_announcement/announcement.py", line 132, in initialize
jupyterhub[31684]: self.template = self.env.get_template("index.html")
jupyterhub[31684]: File "/home/jupyterhub/.local/lib/python3.6/site-packages/jinja2/environment.py", line 883, in get_template
jupyterhub[31684]: return self._load_template(name, self.make_globals(globals))
jupyterhub[31684]: File "/home/jupyterhub/.local/lib/python3.6/site-packages/jinja2/environment.py", line 857, in _load_template
jupyterhub[31684]: template = self.loader.load(self, name, globals)
jupyterhub[31684]: File "/home/jupyterhub/.local/lib/python3.6/site-packages/jinja2/loaders.py", line 429, in load
jupyterhub[31684]: raise TemplateNotFound(name)
jupyterhub[31684]: jinja2.exceptions.TemplateNotFound: index.html
jupyterhub[31684]: 15:34:30.183 [ConfigProxy] error: 503 GET /services/announcement/ socket hang up
jupyterhub[31684]: [D 2021-04-08 15:34:30.186 JupyterHub pages:648] No template for 503

```

I got the same error with similar services. Downgrading jinja2 to 2.10.1 for example fixes temporary the problem.

Any idea?

---

<div class="post-metadata">

**Author:** ![manics](https://yyz1.discourse-cdn.com/flex031/user_avatar/discourse.jupyter.org/manics/32/85_2.png) [@manics](https://discourse.jupyter.org/u/manics)\
**Post date:** [April 8, 2021, 2:10pm UTC](https://discourse.jupyter.org/t/503-service-unavailable-services/8681/2 "2021-04-08T14:10:40Z")

</div>

If you have time would you mind figuring out which version of jinja2 first broke things?

> <https://github.com/pallets/jinja/blob/841fb295ebe9cbd02137911da35b9a14ed884fbb/CHANGES.rst>

It would also be helpful if you could try to reproduce this with a fresh installation of JupyterHub (in a new virtualenv).

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<div class="post-metadata">

**Author:** ![SofianeB](https://yyz1.discourse-cdn.com/flex031/user_avatar/discourse.jupyter.org/sofianeb/32/4126_2.png) [@SofianeB](https://discourse.jupyter.org/u/SofianeB)\
**Post date:** [April 8, 2021, 2:25pm UTC](https://discourse.jupyter.org/t/503-service-unavailable-services/8681/3 "2021-04-08T14:25:37Z")

</div>

@manics the version of jinja2 that broke is `2.11.3`. Actually, it was upgraded automatically when upgrading jupyterhub.

---

<div class="post-metadata">

**Author:** ![radumas](https://yyz1.discourse-cdn.com/flex031/user_avatar/discourse.jupyter.org/radumas/32/4707_2.png) [@radumas](https://discourse.jupyter.org/u/radumas)\
**Post date:** [August 30, 2021, 6:33pm UTC](https://discourse.jupyter.org/t/503-service-unavailable-services/8681/4 "2021-08-30T18:33:28Z")

</div>

I’m getting similar errors having accidentally upgraded to beyond jupyterhub 1.3.

```auto
Aug 30 14:29:23 jupyterhub[5755]: Traceback (most recent call last):
Aug 30 14:29:23 jupyterhub[5755]: File "/etc/jupyterhub/.venv/lib/python3.6/site-packages/tornado/web.py", line 1704, in _execute
Aug 30 14:29:23 jupyterhub[5755]: result = await result
Aug 30 14:29:23 jupyterhub[5755]: File "/etc/jupyterhub/.venv/lib/python3.6/site-packages/jupyterhub/handlers/login.py", line 135, in get
Aug 30 14:29:23 jupyterhub[5755]: self.finish(self._render(username=username))
Aug 30 14:29:23 jupyterhub[5755]: File "/etc/jupyterhub/.venv/lib/python3.6/site-packages/jupyterhub/handlers/login.py", line 102, in _render
Aug 30 14:29:23 jupyterhub[5755]: {'next': self.get_argument('next', '')},
Aug 30 14:29:23 jupyterhub[5755]: File "/etc/jupyterhub/.venv/lib/python3.6/site-packages/jupyterhub/handlers/base.py", line 1176, in render_template
Aug 30 14:29:23 jupyterhub[5755]: template = self.get_template(name)
Aug 30 14:29:23 jupyterhub[5755]: File "/etc/jupyterhub/.venv/lib/python3.6/site-packages/jupyterhub/handlers/base.py", line 1170, in get_template
Aug 30 14:29:23 jupyterhub[5755]: return self.settings['jinja2_env'].get_template(name)
Aug 30 14:29:23 jupyterhub[5755]: File "/etc/jupyterhub/.venv/lib/python3.6/site-packages/jinja2/environment.py", line 883, in get_template
Aug 30 14:29:23 jupyterhub[5755]: return self._load_template(name, self.make_globals(globals))
Aug 30 14:29:23 jupyterhub[5755]: File "/etc/jupyterhub/.venv/lib/python3.6/site-packages/jinja2/environment.py", line 857, in _load_template
Aug 30 14:29:23 jupyterhub[5755]: template = self.loader.load(self, name, globals)
Aug 30 14:29:23 jupyterhub[5755]: File "/etc/jupyterhub/.venv/lib/python3.6/site-packages/jinja2/loaders.py", line 429, in load
Aug 30 14:29:23 jupyterhub[5755]: raise TemplateNotFound(name)
Aug 30 14:29:23 jupyterhub[5755]: jinja2.exceptions.TemplateNotFound: login.html

```

I tried downgrading the environment to jupyterhub \< 1.3 and jinja \< 2.11.3 but this persists

---

<div class="post-metadata">

**Author:** ![radumas](https://yyz1.discourse-cdn.com/flex031/user_avatar/discourse.jupyter.org/radumas/32/4707_2.png) [@radumas](https://discourse.jupyter.org/u/radumas)\
**Post date:** [August 30, 2021, 7:15pm UTC](https://discourse.jupyter.org/t/503-service-unavailable-services/8681/5 "2021-08-30T19:15:33Z")

</div>

Never mind, had a bunch of directory permission issues that needed resolving.