diff --git a/jupyterhub_config.py b/jupyterhub_config.py
index 23a2a68..de645f5 100755
--- a/jupyterhub_config.py
+++ b/jupyterhub_config.py
@@ -13,8 +13,9 @@ c = get_config()
 # Spawn single-user servers as Docker containers
 c.JupyterHub.spawner_class = 'dockerspawner.DockerSpawner'
 # Spawn containers from this image
-# c.DockerSpawner.container_image = os.environ['DOCKER_NOTEBOOK_IMAGE']
-c.DockerSpawner.container_image = "jupyter/scipy-notebook"
+c.DockerSpawner.container_image = os.environ['DOCKER_NOTEBOOK_IMAGE']
+# c.DockerSpawner.container_image = "jupyter/scipy-notebook"
+
 # JupyterHub requires a single-user instance of the Notebook server, so we
 # default to using the `start-singleuser.sh` script included in the
 # jupyter/docker-stacks *-notebook images as the Docker run command when
@@ -22,12 +23,17 @@ c.DockerSpawner.container_image = "jupyter/scipy-notebook"
 # using the DOCKER_SPAWN_CMD environment variable.
 spawn_cmd = os.environ.get('DOCKER_SPAWN_CMD', "start-singleuser.sh")
 c.DockerSpawner.extra_create_kwargs.update({ 'command': spawn_cmd })
+
+# Memory limit
+c.Spawner.mem_limit = '1G'
+
 # Connect containers to this Docker network
 network_name = os.environ['DOCKER_NETWORK_NAME']
 c.DockerSpawner.use_internal_ip = True
 c.DockerSpawner.network_name = network_name
 # Pass the network name as argument to spawned containers
 c.DockerSpawner.extra_host_config = { 'network_mode': network_name }
+
 # Explicitly set notebook directory because we'll be mounting a host volume to
 # it.  Most jupyter/docker-stacks *-notebook images run the Notebook server as
 # user `jovyan`, and set the notebook directory to `/home/jovyan/work`.
@@ -38,8 +44,8 @@ c.DockerSpawner.notebook_dir = notebook_dir
 # notebook directory in the container
 
 # c.DockerSpawner.volumes = { 'jupyterhub-user-{username}': notebook_dir }
-c.DockerSpawner.volumes = { 'jupyterhub-user-{username}': notebook_dir, 
-                            '/home/michael/repos/':'/home/jovyan/work/shared/' } 
+c.DockerSpawner.volumes = { 'power-user-{username}': notebook_dir, 
+                            '/home/michael/repos/':'/home/shared/' } 
 
 # volume_driver is no longer a keyword argument to create_container()
 # c.DockerSpawner.extra_create_kwargs.update({ 'volume_driver': 'local' })
@@ -57,10 +63,23 @@ c.JupyterHub.hub_ip = 'jupyterhub'
 #c.JupyterHub.ssl_key = os.environ['SSL_KEY']
 #c.JupyterHub.ssl_cert = os.environ['SSL_CERT']
 
+### Authentication 
 # Authenticate users with GitHub OAuth
-c.JupyterHub.authenticator_class = 'oauthenticator.GitHubOAuthenticator'
-c.GitHubOAuthenticator.oauth_callback_url = os.environ['OAUTH_CALLBACK_URL']
+# c.JupyterHub.authenticator_class = 'oauthenticator.GitHubOAuthenticator'
+# c.GitHubOAuthenticator.oauth_callback_url = os.environ['OAUTH_CALLBACK_URL']
 
+# Authenticate with thedataincubator/jupyterhub-hashauthenticator
+c.JupyterHub.authenticator_class = 'hashauthenticator.HashAuthenticator'
+# You can generate a good "secret key" by running `openssl rand -hex 32` in terminal.
+# it is recommended to do this from time-to-time to change passwords (including changing their length)
+c.HashAuthenticator.secret_key = '20a507952405b2e398542c721ce4954c1514ac079c0373e70a517595a43a9013'  # Defaults to ''
+c.HashAuthenticator.password_length = 5          # Defaults to 6
+# If the `show_logins` option is set to `True`, a CSV file containing 
+#login names and passwords will be served (to admins only) at `/hub/login_list`. 
+c.HashAuthenticator.show_logins = True            # Optional, defaults to False
+
+
+### Database Interaction - cookies, db for jupyterhub
 # Persist hub data on volume mounted inside container
 data_dir = os.environ.get('DATA_VOLUME_CONTAINER', '/data')
 
@@ -89,3 +108,12 @@ with open(os.path.join(pwd, 'userlist')) as f:
             whitelist.add(name)
             if len(parts) > 1 and parts[1] == 'admin':
                 admin.add(name)
+
+# Run script to automatically stop idle single-user servers as a jupyterhub service.
+c.JupyterHub.services = [
+    {
+        'name': 'cull_idle',
+        'admin': True,
+        'command': 'python /srv/jupyterhub/cull_idle_servers.py --timeout=3600'.split(),
+    },
+]