Logging into HPC machines using ssh

This page provides instructions to use ssh to log into HPC-Lehigh machines. The instructions for using ssh are same regardless of what system a user is trying to access. However the username and passwords for some systems may be different. A user should understand the Service Levels that offer access to different machines and make sure that she has proper privileges to use a machine before proceeding further.

• What is SSH?
• What is the hostname?
• What is my password?
• On Campus
  • Windows
    • Using Secure Shell
    • Using PuTTY
    • Using X-Win32
  • Linux
  • Mac
• Off Campus
  • Windows
    • Using Secure Shell
    • Using PuTTY
    • Using Cygwin (Windows XP)
    • Using Xming (Windows Vista)
  • Linux
  • Mac

What is SSH?

Most of the computing resources of HPC Lehigh are located in locations that may not be accessed personally by the users. The users can log into these machines from any computer that is connected to the internet using a protocol called Secure Shell or SSH. SSH allows the user to login to a machine and run her jobs or transfer files over an encrypted channel. More information about ssh can be obtained from Wikipedia.

What is the hostname?

Since the procedure of logging-in is same for all machines, the procedure is explained assuming that the host-name of the machine is 'HOSTNAME'. The 'HOSTNAME' should be replaced by the appropriate name of the desired machine. The following table contains the appropriate values of 'HOSTNAME' for different resources.

Machine	'HOSTNAME'
Compute Server (Altair)	altair.cc.lehigh.edu
Computer Servers (Trit)	trit1.cc.lehigh.edu trit2.cc.lehigh.edu trit3.cc.lehigh.edu
Computer Server (Capella)	capella.cc.lehigh.edu
HPC Cluster	blaze.cc.lehigh.edu
Lehigh Application Farm	leaf.cc.lehigh.edu
Chemistry Department	mu489n.cc.lehigh.edu mu489p.cc.lehigh.edu mu489q.cc.lehigh.edu mu489r.cc.lehigh.edu mu489s.cc.lehigh.edu mu489t.cc.lehigh.edu
Math Department	xs106a.cc.lehigh.edu xs106b.cc.lehigh.edu xs106c.cc.lehigh.edu xs106d.cc.lehigh.edu
Physics Department	ph317a.cc.lehigh.edu ph317b.cc.lehigh.edu ph317c.cc.lehigh.edu ph317d.cc.lehigh.edu

If a user wants to log into the compute server then she should use altair.cc.lehigh.edu instead of HOSTNAME in the following instructions. Similarly if the user wants to log into a Linux Workstation then she should use the host name of that workstation.

What is my password?

The username and password for Altair, LEAF and the Linux Workstations is same as the Lehigh Network ID and the associated password. The username and password for a user's account in HPC-cluster may be different from her Lehigh Network ID and password. This information is sent to users when the account is created. Please contact us in case you have forgotten this information.

On Campus

You could directly log onto any host listed above.

• Windows
  It is highly recommended to use SSH Secure Shell, default installed on public site PCs and X-Win32, which can be installed from "Install Software" option in "Start" menu.
  SSH Terminal: SSH Secure Shell, PuTTY
  SSH Graphical Interface: X-Win32
• Linux
  See detail.
• Mac
  See detail.

Off Campus

All HPC machines are behind Lehigh University's firewall. If a user wants to access the resources from outside, there are two ways:

1. The preferred way is to first log into the machine ssh.cc.lehigh.edu and then log into other machines from there. ssh.cc.lehigh.edu can be accessed from anywhere from a Windows, Linux or a Mac that is connected to the internet.
   
   
2. A user can also set up a VPN connection to Lehigh's Network. The user will then be a part of Lehigh's Network and will be able to access any machines without being affected by the firewall.

• Windows
  SSH Terminal: SSH Secure Shell, PuTTY, Cygwin (Windows XP)
  SSH Graphical Interface: Cygwin (Windows XP), Xming (Windows Vista)
• Linux
  See detail.
• Mac
  See detail.

Last Modified: August 19, 2009