diff --git a/Makefile b/Makefile
index 92dad10..7a891ed 100755
--- a/Makefile
+++ b/Makefile
@@ -11,6 +11,8 @@ network:
 volumes:
 	@docker volume inspect $(DATA_VOLUME_HOST) >/dev/null 2>&1 || docker volume create --name $(DATA_VOLUME_HOST)
 	@docker volume inspect $(DB_VOLUME_HOST) >/dev/null 2>&1 || docker volume create --name $(DB_VOLUME_HOST)
+	@docker volume inspect ro_shared_volume >/dev/null 2>&1 || docker volume create --name ro_shared_volume
+	@docker volume inspect rw_shared_volume >/dev/null 2>&1 || docker volume create --name rw_shared_volume
 
 secrets/postgres.env:
 	@echo "Generating postgres password in $@"
diff --git a/jupyterhub_config.py b/jupyterhub_config.py
index 3ba4d9b..8167f45 100755
--- a/jupyterhub_config.py
+++ b/jupyterhub_config.py
@@ -35,7 +35,7 @@ c.DockerSpawner.extra_create_kwargs.update({ 'command': spawn_cmd })
 
 # Memory limit
 c.Spawner.mem_limit = '2G'  # RAM limit
-c.Spawner.cpu_limit = 2.0 # limit on number of cores 
+
 # Connect containers to this Docker network
 network_name = os.environ['DOCKER_NETWORK_NAME']
 c.DockerSpawner.use_internal_ip = True
@@ -54,7 +54,9 @@ c.DockerSpawner.notebook_dir = notebook_dir
 
 # c.DockerSpawner.volumes = { 'jupyterhub-user-{username}': notebook_dir }
 c.DockerSpawner.volumes = { 'hub-user-{username}': notebook_dir, 
-                            '/home/shared':'/home/jovyan/work/shared/' } 
+                            'ro_shared_volume':{"bind": '/home/jovyan/shared_volume_ro', "mode": "ro"},
+                            'rw_shared_volume':{"bind": '/home/jovyan/shared_volume_rw', "mode": "rw", "propagation": "rshared"},
+                            '/home/shared/':'/home/jovyan/shared_directory/' } 
 
 # volume_driver is no longer a keyword argument to create_container()
 # c.DockerSpawner.extra_create_kwargs.update({ 'volume_driver': 'local' })