University of
ConnecticutAccessing the Compute Server
| Overview| SSH| X Windows| Batch Processing| FTP| E-Mail
| Overview |
The Compute server is available via the Internet using the following methods: SSH and SFTP. Using SSH you can also establish an XWindows connection to the server. It is not possible to connect to the Compute server for use as an email or web client or server.
| SSH | ||||||||||||
|
SSH provides a secure way to access the Compute server that looks and feels like Telnet. SSH clients are freely available for most platforms. Here are some suggested links for the following platforms:
SSH provides a command-line (or ASCII character based) interface to your UNIX account. To establish an SSH connection to your account on the Compute server you will need the following information:
|
| X-Windows |
X Windows is a graphical, windows-like interface commonly used to access UNIX systems. It can either be used on a console attached directly to a UNIX machine, or from a remote workstation (a Mac, PC, or another UNIX workstation). Third party software is required for Windows, please consult the third party vendor documentation for connection instructions. You can connect to compute.uconn.edu by whatever means is supported by your X Windows software.
For more information on X Windows, you might try the X Windows Aid.
Using X Windows
Using X Windows requires an SSH enabled X-Server or a Computer with Linux and SSH installed. X Windows X clients such as aixterm, maple, and others may be launched on the remote UNIX machine, and their output displayed back on your local console. Most X Windows emulation packages also support launching clients directly from the Windows or Macintosh desktop. Some clients support the -ln flag, to execute the user's profile for the shell being initiated. Some clients also support the -display flag which may be required in some cases, to redirect output back to the user workstation.
Clients such as aixterm, maple, and others, can be launched from the UNIX command line, or from the X-server emulation package.
Additional steps may be required; these steps include:
- setting the DISPLAY variable to refer back to your local machine or console,
- using the xhost command to authorize the Compute Server to display X Windows on your local machine or console,
- setting the Compute Server as your font server.
Setting the DISPLAY variable
When using X Windows, you may have to set the UNIX DISPLAY variable to point back to your local display console. Normally it should be set to your own IP address, plus a designation for the selected console (usually zero). Example:
my.pc.uconn.edu:0
Most of the PC and Macintosh X Windows emulators do this automatically, or allow you to append the display option to any X clients that you launch on the remote UNIX machine.
If your X Windows package does not set the DISPLAY variable automatically, or if you are connecting from another UNIX workstation, you will have to set the DISPLAY variable yourself.
If you are a Korn shell user (ksh) the command would be something like the following:
export DISPLAY=my.pc.uconn.edu:0
If you are using C shell (csh) the command would be:
setenv DISPLAY my.pc.uconn.edu:0
X font server
If you are using an X server on a PC, Macintosh, or another UNIX workstation, and running X windows programs from the Compute Server, you may occasionally get error regarding missing X fonts, depending on which X programs you are running.
One easy solution to this problem is to use the Compute Server as a font server. This allows your X server software (for example, eXodus, OpenWin, etc.) to search the Compute Server for missing fonts.
You can set the Compute Server as a font server, by running the fontserver command. After you are logged in to Compute, and after you have set your DISPLAY variable, you can simply issue the fontserver command (located in /usr/local/bin):
fontserver
The fontserver script executes the following xset command:
xset +fp tcp/compute.uconn.edu:7000
which tells your X server to use the Compute Server as a font server, running on tcp port 7000.
If you want to remove the Compute Server from your X server list, run the rmfontserver command:
rmfontserver
The rmfontserver script executes the following xset command:
xset -fp tcp/compute.uconn.edu:7000
To query your X server's search list, run this command from Compute, after your DISPLAY variable is set:
xset -q
To reset your server to it's default, you can run this xset command:
xset fp default
| Batch Processing |
Batch Processing is no longer available or supported. The system is reserved for computational work with no restrictions placed on CPU or other system resources as no other work is performed by this system.
| FTP |
FTP is not available on the Compute Server, please use SFTP for all file transfer.
Please note: There is a 48-hour drop folder which can be used to store files temporarily for access under anonymous FTP. This is available on the UConn FTP server.
The Compute Server does not support incoming mail receipt.