When you get a new hub, by default everyone gets a workspace and can submit jobs to
your attached cluster(s). This means that the user can run many different
commands both on your hub and on your clusters, in addition to 
the software applications your hub provides. 

For some sites, this causes security issues, so you may wish to limit access to the 
software the user can execute and the clusters he or she can submit jobs too. Usually 
only tool developers need workspace access.

== Limiting Workspace Access ==

The first thing to do is to ask HUBzero staff to '''change the default to not provide workspace
access'''. 

The user will still be able to run portal applications and pick up their output files
by sftp or webdav.

Then, to give users a workspace:

  * login to the Joomla interface
  * select Components/Groups
  * locate the app-workspace (Workspace Development) group, click Total Members
  * add users as appropriate


== Limiting Submit Access ==

There are several aspects to submit access control.

  * Allow a user run a HUB application that gets submitted 
    as a job to a cluster.
  * Allow a user run standard unix and shell commands as jobs submitted
   to a cluster, even something as simple as  '''echo hello'''
  * Allow a user stage his or her own executable to a cluster and run it.

To set access control, You will need to be a member of the group name ''apps'', so that you have write permissions
on the files ''/opt/submit/sites.dat'' and ''/opt/submit/tools.dat'' and on your HUB. 
You can add yourself through the Joomla interface as described above. It can take
a day before the change propagates through the system.