Clemson Computational Minigrid Supercomputing Facility

Access Software download Page

Due to the security problems inherent in any University network, the clusters on the grid are accessible by secure shell ONLY. This avoids the thrice weekly downtime to remove the rootkits installed via telnet, rlogin, or FTP. As a result, you'll need a secure client to get access.

From any UNIX or similar type box, this should be no problem, clients for ssh and scp should be installed. These work exactly like the more familiar rsh and rcp commands. The basics:

 
	ssh machinename

	or 

	ssh username@machinename

	scp   machinename:

	or 

	scp   username@machinename:
Ssh provides a shell from your machine, and also forwards any X traffic (graphics or other windows) through a secure connection, encrypting your password and all the information in the session, protecting you from "sniffers" that listen to public network wires (which means all of them, all of the time; if you don't believe me, use telnet for awhile, and I'll send you the USENET news article containing your password...)

Scp uses ssh to copy files between machines. You can use it like FTP, to move one or many files, or whole directories. However, when moving a lot of files using wildcards, you need to be a bit careful.

When you type a command like cp *.c /tmp , your shell (or command interpreter) helpfully expands the "*.c" for you BEFORE passing it to the copy command. If you wish to give scp a wildcard to be expanded on the remote machine, you need to prevent the shell from doing this. This can be achieved simply by putting the argument containing the machine name and filename(s) inside quotes, as in the examples below:

scp  "dstanzi@guanine:output/*.dat"     ./output

scp  output/*.dat  guanine:/tmp/output/

For Windows Users:

If instead of a computer you are using a Windows box to access the grid, you will need to download and install your own ssh/scp clients. The links below provide access to some of the simplest ones to install and use. I recommend the "putty" ssh client as the easiest solution: If you are using one of the command line file transfer clients, read the instructions for using wildcard characters to transfer multiple files in the UNIX section above.

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