Problem:
When trying to start Jupyter Hub, you see an error message like
[E 2021-06-18 13:07:48.462 JupyterHub proxy:711] Failed to find proxy ['configurable-http-proxy']
The proxy can be installed with `npm install -g configurable-http-proxy`.To install `npm`, install nodejs which includes `npm`.If you see an `EACCES` error or permissions error, refer to the `npm` documentation on How To Prevent Permissions Errors.
[C 2021-06-18 13:07:48.462 JupyterHub app:2739] Failed to start proxy
Traceback (most recent call last):
File "/usr/local/lib/python3.8/dist-packages/jupyterhub/app.py", line 2737, in start
await self.proxy.start()
File "/usr/local/lib/python3.8/dist-packages/jupyterhub/proxy.py", line 707, in start
self.proxy_process = Popen(
File "/usr/lib/python3.8/subprocess.py", line 854, in __init__
self._execute_child(args, executable, preexec_fn, close_fds,
File "/usr/lib/python3.8/subprocess.py", line 1702, in _execute_child
raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: 'configurable-http-proxy'
Solution:
As outlined in the Jupyter Hub installation docs, you need to install the configurable-http-proxy npm package in order for Jupyter to work:
sudo npm install -g configurable-http-proxy
In case you haven’t installed npm, see our article on How to install NodeJS 14.x LTS on Ubuntu in 1 minute or find the appropriate distribution for your OS on the NodeJS download page.