The FastX remote desktop service gives users access to Casper for performing lightweight tasks such as text editing, running programs such as xxdiff and ncview, or running analysis scripts that consume little in the way of graphics resources.
A user can log out of a FastX remote desktop and return to it later. This service will remain available while NCAR and UCAR building closures are in effect.
FastX sessions that consume excessive resources are subject to being killed. For resource-intensive workloads that do not require GPU-based rendering, consider starting a Casper job instead by running an execcasper command from a FastX terminal window. For more resource-intensive work with high-end, GPU-accelerated graphics, consider using the vncmgr script rather than FastX.
FastX can be accessed through a web browser or a desktop client. How to use both of these options is described below.
To use FastX without installing any software, connect to the NCAR VPN and use an updated version of any common browser. See the following section for an alternative to using the VPN.
Some users will find that their terminal environment configuration is not complete (module commands will not be available, for example). To initialize your environment, run the following command once you open the Kconsole:
bash, ksh users: source /etc/profile
csh, tcsh users: source /etc/csh.login
If you want to retain your session to return to it later, just log out or kill the browser window. When you log in again, select the icon to re-open the session.
If you do not want to retain your session, terminate it as shown here before logging out:
If you are not connected to or do not want to connect to the NCAR VPN, you can still use FastX via web browser by creating an ssh tunnel from your laptop or desktop to FastX.
Start by running the following on your command line, inserting your own username.
ssh -L 3300:fastx.ucar.edu:3300 -l username fastx.ucar.edu
To create a tunnel using PuTTY or SecureCRT, following the examples in these video demonstrations:
After creating the tunnel, proceed as described in the previous section.
If you’re not connected to the NCAR VPN or prefer to use a faster, more robust remote desktop service, consider downloading and installing the FastX desktop client. Windows users: If you do not have admin privileges to install the client on your machine, choose the “Windows Nonroot” client.