[IPython-dev] Internal port error from Jupyterhub

[MinRK]

On Thu, Jun 18, 2015 at 11:57 PM, Clare Sloggett <claresloggett at gmail.com>
wrote:

Hi all,
>
> Is this mailing list still the right place to ask about Jupyterhub?
>
This is fine, but we’re gently directing Jupyter stuff toward the jupyter
mailing list <https://groups.google.com/forum/#!forum/jupyter>.

I'm getting an error that seems strange to me, I'm hoping someone might
> have insight. It's complaining about port availability, and it really looks
> like that's the error, but the port looks available. So I'm mystified.
>
> Short version: when I run
>    jupyterhub --port 9520 --JupyterHub.hub_port=8500
> I get an error ("Failed to bind hub to http://localhost:8500/hub/" and
> "Cannot assign requested address" - detailed error message is below).
>
> Yet, if I use the same port to run
>   python -m SimpleHTTPServer 8500
> the SimpleHTTPServer runs happily and is accessible, indicating that the
> port is actually available.
>
> This occurs no matter what port I specify for JupyterHub.hub_port.
>
> Here are some more details:
>
> I'm trying to install on an Ubuntu 14.04 server. There are other services
> running on this server, but none of them occupy port 8500 (or 9520) and
> given that SimpleHTTPServer works I am assuming that the other services are
> probably not the problem?
>
It’s possible that you can’t bind to localhost, not the port.
SimpleHTTPServer binds to all interfaces by default. Try:

import socket
s = socket.socket()
s.bind(('localhost', 8500))

If that fails, you can try 127.0.0.1 instead of localhost. If 127 works,
you can set this value in your jupyterhub_config.py file:

c.JupyterHub.hub_ip = '127.0.0.1'

-MinRK


> To install Jupyterhub I am running
>
> git clone https://github.com/jupyter/jupyterhub
>
> cd jupyterhub/
>
> sudo npm install -g configurable-http-proxy
>
> sudo apt-get install python3-pip
>
> sudo apt-get install nodejs-legacy
>
> sudo pip3 install -r requirements.txt
> sudo pip3 install .
>
> If I run Jupyterhub as root (or otherwise), the complete error I get is:
>
> $ sudo jupyterhub --port 9520 --JupyterHub.hub_port=8500
> [I 2015-06-19 06:51:17.962 JupyterHub app:522] Loading cookie_secret from
> /home/ubuntu/install_jupyterhub/jupyterhub/jupyterhub_cookie_secret
> [W 2015-06-19 06:51:18.010 JupyterHub app:260]
>     Generating CONFIGPROXY_AUTH_TOKEN. Restarting the Hub will require
> restarting the proxy.
>     Set CONFIGPROXY_AUTH_TOKEN env or JupyterHub.proxy_auth_token config
> to avoid this message.
>
> [I 2015-06-19 06:51:18.020 JupyterHub app:623] Not using whitelist. Any
> authenticated user will be allowed.
> [E 2015-06-19 06:51:18.034 JupyterHub app:998] Failed to bind hub to
> http://localhost:8500/hub/
> [E 2015-06-19 06:51:18.034 JupyterHub app:1066]
>     Traceback (most recent call last):
>       File "/usr/local/lib/python3.4/dist-packages/jupyterhub/app.py",
> line 1064, in launch_instance_async
>         yield self.start()
>       File "/usr/local/lib/python3.4/dist-packages/jupyterhub/app.py",
> line 996, in start
>         self.http_server.listen(self.hub_port, address=self.hub_ip)
>       File "/usr/local/lib/python3.4/dist-packages/tornado/tcpserver.py",
> line 126, in listen
>         sockets = bind_sockets(port, address=address)
>       File "/usr/local/lib/python3.4/dist-packages/tornado/netutil.py",
> line 187, in bind_sockets
>         sock.bind(sockaddr)
>     OSError: [Errno 99] Cannot assign requested address
>
> Any help would be very much appreciated!
>
> Cheers,
> Clare
>
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> http://mail.scipy.org/mailman/listinfo/ipython-dev
>
>
> ​
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