[jupyterhub] Set data direcory as notebook directory

jupyterhub/jupyter_notebook_config.py

@@ -3,3 +3,4 @@ c.NotebookApp.token = ''
 c.NotebookApp.allow_root = True
 c.NotebookApp.terminado_settings = { 'shell_command': ['/bin/bash', '-l'] }
 c.MultiKernelManager.default_kernel_name = 'robofish'
+c.NotebookApp.notebook_dir = '/data'