New Cluster Account

Request an accuount

Email the System administrators with your request (your terpemail or /umd directory name, your full name, project you plan to work on/professor your are working with  and your contact information.  Accounts are available for members of the High Energy Physics group at UMD.

Before logging in, please read all the instructions.

Your first connection & password changes

Before logging in, please read all the instructions.

The first time you login

please ssh to the cluster (follow these instructions to get PuTTY if you have Windows, Mac users login with ssh -Y).  You can use any of commands to connect to the cluster.  First one will choose either hepcms-in1.umd.edu or hepcms-in2.umd.edu. Both machines are functionally the same.

ssh -X -Y username@hepcms.umd.edu

ssh -X -Y username@hepcms-in1.umd.edu

ssh -X -Y username@hepcms-in2.umd.edu

*PuTTY users, make sure that the only thing in your Auto-login username box is your username, nothing extra

When you first log in, you will be prompted to create a new password; please do so. You will be automatically logged off and must log in again with the new password.

Please note that your directory are read/execute (rx)  accessible to all users.  If you would like to protect any subdirectory, you can change permissions using chmod command.

If you need to change your password, 

use the yppasswd command:

ssh username@hepcms.umd.edu

yppasswd

Data Storage

In addition to your home area, /home/username, you have space in /data/users/username. At the present time, neither area has user quotas, so please be courteous to other users of these disks. /home are is for your analysis code. We request that you use no more than 50 GB in your /home/username area.  Please do not store large  files in ./home area. Please place any large datasets in /data/users/username, with no more than 1TB usage.  If you need larger space, please let us know.  /data area is NOT backed up, so any critical files should be backed up off-site. Significantly larger usage of /home to the point of filling up the directory will break the cluster and will result in the sysadmin deletion of files.

Enable your web directory

First, contact the System administrators to request your account be given access to be able to share the web pages, tell them your username and web directory reason. If you would like to share files via the web at the location http://hepcms-hn.umd.edu/~username:

chmod 711 /home/username

mkdir /home/username/public_html

chmod 755 /home/username/public_html

Copy any files you wish to make available on the web to public_html. Note that public_html is inside your /home directory, so avoid placing many large files here (limited shared space for all users). If a file with name index.html exists, it will be displayed when anyone navigates to the address http://hepcms-hn.umd.edu/~username. Otherwise the directory contents will be shown.

If desired, you can change the permissions of public_html to 711, which will prevent the web site from displaying the contents of your public_html directory when an index file isn't present. Do not change the permissions of public_html to anything other than 711 or 755. Any subdirectory can be given permissions 711 to 'hide' it on directory content lists, though if someone knows the name of a file inside, they can still read it in their browser.

Depending on the settings in your login, new files and files transferred to public_html may not be world readable. To change a file to be world readable use:

chmod 644 /home/username/public_html/index.html

Troubleshooting your connection

1. 1 Troubleshooting your connection