Users must have accounts in order to log in to the high-performance computing (HPC) systems that CISL manages.
Connecting to one of these systems from a local computer is most commonly done using Secure Shell (SSH) access and X Window software.
As explained below, users have a number of ways to get what they need.
Individuals who have user accounts can log in to CISL-supported HPC systems. Each person must have his or her own user account; they may not be shared.
Accounts are established when an allocation is awarded or when a project lead or project administrator later requests accounts for additional individuals. Use this form to submit such requests.
Users are responsible for notifying CISL of changes in their contact information (email, phone, address, and so on). If CISL personnel are unable to reach a user when necessary, the user's account will be locked. For additional information on responsibilities that come with having a user account, see User responsibilities.
Users commonly access the NCAR systems that CISL manages through a terminal window or emulator with Secure Shell (SSH). SSH encrypts transmissions between computers. It provides interactive login, remote command execution, and file transfer services. For systems with X Window servers, SSH also can forward connections from the machine you log into back to your display.
SSH clients are available for all major operating systems, including UNIX, Linux, Microsoft Windows, and Mac OS X. Computers running Mac OS X 10.0.1 or later use OpenSSH.
Here are links to some of the most popular SSH clients, which enable users to establish secure connections through terminal windows:
Client software is available for Apple's iPhones and iPads, too. Here are two examples of SSH clients for iOS devices:
Users need an X Window System to be able to display graphics from the HPC environment on their local machines and to enable X11 forwarding when using interactive applications such as MATLAB. Mac computers and Linux implementations typically come with the necessary X-display support.
These are some of the commonly used X system products for Microsoft Windows users:
Mac OS X users can download XQuartz here.
To see if your local machine already has the necessary display support, log in to the HPC system and run xclock on your command line. A clock will be displayed if you have what you need.
If you get an error like the following one instead, install the X-display software (or start it if it is already installed) on your local machine.
Some users encounter the following message when trying to start an xterm window after logging in or when running a job.
Removing the .Xauthority file from your /glade/u/home/username directory as shown here may solve the problem. You will get a new .Xauthority file the next time you log in.