text: import os
  
  
  c.JupyterHub.spawner_class = 'kubespawner.KubeSpawner'
  
  c.JupyterHub.ip = '0.0.0.0'
  c.JupyterHub.hub_ip = '0.0.0.0'
  
  # Don't try to cleanup servers on exit - since in general for k8s, we want
  # the hub to be able to restart without losing user containers
  c.JupyterHub.cleanup_servers = False
  
  # First pulls can be really slow, so let's give it a big timeout
  c.KubeSpawner.start_timeout = 60 * 5
  
  # Our simplest user image! Optimized to just... start, and be small!
  c.KubeSpawner.singleuser_image_spec = 'yuvipanda/simple-singleuser:v1'
  
  # The spawned containers need to be able to talk to the hub through the proxy!
  c.KubeSpawner.hub_connect_ip = os.environ['HUB_CONNECT_IP']
  
  # Do not use any authentication at all - any username / password will work.
  c.JupyterHub.authenticator_class = 'dummyauthenticator.DummyAuthenticator'
  