Jupyterhub: Cannot start JupyterHub "Failed to start proxy"

Created on 6 Mar 2018 · 3Comments · Source: jupyterhub/jupyterhub

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the issue that you are facing. Please be as thorough as you are able to
provide details on the issue.

How to reproduce the issue
I have followed the instructions and installed

npm install -g configurable-http-proxy
pip3 install jupyterhub

What you expected to happen
Starting up
What actually happens

➜  ~ sudo jupyterhub
[I 2018-03-06 05:27:35.915 JupyterHub app:871] Writing cookie_secret to /home/{username}/jupyterhub_cookie_secret
[I 2018-03-06 05:27:35.929 alembic.runtime.migration migration:117] Context impl SQLiteImpl.
[I 2018-03-06 05:27:35.929 alembic.runtime.migration migration:122] Will assume non-transactional DDL.
[I 2018-03-06 05:27:35.932 alembic.runtime.migration migration:327] Running stamp_revision  -> 3ec6993fe20c
[W 2018-03-06 05:27:35.949 JupyterHub app:955] No admin users, admin interface will be unavailable.
[W 2018-03-06 05:27:35.950 JupyterHub app:956] Add any administrative users to `c.Authenticator.admin_users` in config.
[I 2018-03-06 05:27:35.950 JupyterHub app:983] Not using whitelist. Any authenticated user will be allowed.
[I 2018-03-06 05:27:35.968 JupyterHub app:1528] Hub API listening on http://127.0.0.1:8081/hub/
[W 2018-03-06 05:27:35.969 JupyterHub proxy:415]
    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.

[W 2018-03-06 05:27:35.969 JupyterHub proxy:456] Running JupyterHub without SSL.  I hope there is SSL termination happening somewhere else...
[I 2018-03-06 05:27:35.969 JupyterHub proxy:458] Starting proxy @ http://*:8000/
05:27:36.068 - info: [ConfigProxy] Proxying http://*:8000 to (no default)
05:27:36.070 - info: [ConfigProxy] Proxy API at http://127.0.0.1:8001/api/routes
[C 2018-03-06 05:27:47.545 JupyterHub app:1535] Failed to start proxy
    Traceback (most recent call last):
      File "/usr/lib/python3.6/site-packages/jupyterhub/app.py", line 1533, in start
        yield self.proxy.start()
      File "/usr/lib/python3.6/site-packages/jupyterhub/proxy.py", line 489, in start
        yield server.wait_up(1)
      File "/usr/lib/python3.6/site-packages/jupyterhub/utils.py", line 146, in wait_for_server
        timeout=timeout
      File "/usr/lib/python3.6/site-packages/jupyterhub/utils.py", line 135, in exponential_backoff
        raise TimeoutError(fail_message)
    TimeoutError: Server at {hostname}:8000 didn't respond in 1 seconds

Share what version of JupyterHub you are using

➜  ~ sudo jupyterhub --version
0.8.1

Running jupyter troubleshoot from the command line, if possible, and posting
its output would also be helpful.

Insert jupyter troubleshoot output here
DEPRECATION: The default format will switch to columns in the future. You can use --format=(legacy|columns) (or define a format=(legacy|columns) in your pip.conf under the [list] section) to disable this warning.
$PATH:
    /bin
    /sbin
    /bin
    /usr/sbin
    /usr/bin

sys.path:
    /usr/bin
    /usr/lib64/python36.zip
    /usr/lib64/python3.6
    /usr/lib64/python3.6/lib-dynload
    /usr/lib64/python3.6/site-packages
    /usr/lib/python3.6/site-packages

sys.executable:
    /usr/bin/python3.6

sys.version:
    3.6.4 (default, Dec 19 2017, 14:48:12)
    [GCC 4.8.5 20150623 (Red Hat 4.8.5-16)]

platform.platform():
    Linux-3.10.0-693.17.1.el7.x86_64-x86_64-with-centos-7.4.1708-Core

which -a jupyter:
    /bin/jupyter
    /bin/jupyter
    /usr/bin/jupyter

pip list:
    alembic (0.9.8)
    astroid (1.6.1)
    autopep8 (1.3.4)
    bleach (2.1.2)
    certifi (2018.1.18)
    chardet (3.0.4)
    decorator (4.2.1)
    entrypoints (0.2.3)
    html5lib (1.0.1)
    idna (2.6)
    ipykernel (4.8.2)
    ipython (6.2.1)
    ipython-genutils (0.2.0)
    ipywidgets (7.1.2)
    isort (4.3.4)
    jedi (0.11.1)
    Jinja2 (2.10)
    jsonschema (2.6.0)
    jupyter (1.0.0)
    jupyter-client (5.2.2)
    jupyter-console (5.2.0)
    jupyter-core (4.4.0)
    jupyterhub (0.8.1)
    lazy-object-proxy (1.3.1)
    Mako (1.0.7)
    MarkupSafe (1.0)
    mccabe (0.6.1)
    mistune (0.8.3)
    nbconvert (5.3.1)
    nbformat (4.4.0)
    notebook (5.4.0)
    pamela (0.3.0)
    pandocfilters (1.4.2)
    parso (0.1.1)
    pexpect (4.4.0)
    pickleshare (0.7.4)
    pip (9.0.1)
    prompt-toolkit (1.0.15)
    ptyprocess (0.5.2)
    pycodestyle (2.3.1)
    Pygments (2.2.0)
    pylint (1.8.2)
    python-dateutil (2.6.1)
    python-editor (1.0.3)
    python-oauth2 (1.1.0)
    pyzmq (17.0.0)
    qtconsole (4.3.1)
    requests (2.18.4)
    Send2Trash (1.5.0)
    setuptools (38.5.1)
    simplegeneric (0.8.1)
    six (1.11.0)
    speedtest-cli (2.0.0)
    SQLAlchemy (1.2.4)
    sudospawner (0.5.1)
    terminado (0.8.1)
    testpath (0.3.1)
    tornado (5.0)
    traitlets (4.3.2)
    urllib3 (1.22)
    wcwidth (0.1.7)
    webencodings (0.5.1)
    widgetsnbextension (3.1.4)
    wrapt (1.10.11)

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