Windows
An HPC system is not like a regular computer that you can log into and begin using, there are multiple parts that make up the system. This page instructs users in using the applications that have the ability to use ssh. Ssh is one of the main methods for users to securely login to an HPC system. Older versions of Windows 10 do not have a native application that has the ability to use ssh, one must be downloaded. Those versions need a separate ssh client to be installed as an application. One of the commonly used applications is called PuTTY, but there are other options, such as MobaXTerm.
Contents
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How to Login Using ssh
ssh stands for 'Secure Shell' This is one of the main methods for users to securely login to an HPC system.
For more information about Teton, specific examples with ssh the see ssh access section on this page.
Step 1. The Terminal and ssh clients
Windows 10
Alternatively, older versions of Windows 10 does not have a native application that has the ability to use ssh. Those versions need a separate ssh client to be installed as an application. One of the most popular ones is called PuTTY, but there are other options, one of them being MobaXTerm, which provides a little more functionality. It is up to user preference on which one they like to use.
Newer versions of Windows 10 has a native application that can use ssh. In some cases, it is only available if you enable a setting, and in other cases, you can directly open the Windows command prompt and use ssh.
To make your options diverse, Windows 10 also provides a means of using Linux directly on the system. Windows Subsystem for Linux (WSL) is a compatibility layer for running Linux binary executables natively on Windows 10.
For users who use Google Chromebooks, there are several ssh clients available to download through the Chrome Web Store. One of the most popular Terminal clients is an Android app called Terminus that can also be used on iOS.
Step 2. Using ssh
In all of these methods, is important to know a few things about using ssh:
The host-name of the system
What your username is on the HPC System
Your password on the system
Anything else the system administrators require*, e.g. Two-factor authentication
At The University of Wyoming, there are a few prerequisites that users need to have before they can log in to the local HPC system. Watch this video on the prerequisites or find them on the ARCC Prerequisites page.
Using ssh
On Windows 10 Command Prompt or Windows subsystem for Linux, the command for ssh is pretty simple and can be executed by typing:
ssh username@host-name You send the command by hitting enter (or return) on your keyboard.
When using an ssh client, like PuTTY, a Windows 10 user may have to add their username and host-name in separate boxes, but the effect is the same.
Enabling The Graphical Applications (Optional)
Sometimes a user will need to visualize data while working on an HPC system. This is done by enabling X11 forwarding.
The X Window System (also known as X11, or just X) is a software package and network protocol that lets you interact locally, using your personal computer's display, mouse, and keyboard, with the graphical user interface (GUI) of an application running on a remote networked computer.
Using X forwarding in an ssh session on your personal computer allows you to securely run graphical applications (X clients) installed on HPC systems.
Windows 10
On Windows, you need to also install a separate piece of software to enable X11. One of the most popular is called Xming, X Server for Windows. However, the ssh client MobaXTerm comes with X11 forwarding enabled by default and no additional software to install.
ssh Access
Teton has login nodes for users to access the cluster. Login nodes are available publicly using the hostname teton.arcc.uwyo.edu or teton.uwyo.edu. SSH can be done natively on macOS or Linux based operating systems using the terminal and the ssh command. Although X11 forwarding is supported, and if you need graphical support, we recommend using FastX if at all possible. Additionally, you may want to configure your OpenSSH client to support connection multiplexing if you require multiple terminal sessions. For those instances where you have unreliable network connectivity, you may want to use either tmux or screen once you login to keep sessions alive during disconnects. This will allow you to later reconnect to these sessions.
ssh USERNAME@teton.arcc.uwyo.edu
ssh -l USERNAME teton.arcc.uwyo.edu
ssh -Y -l USERNAME teton.arcc.uwyo.edu # For secure forwarding of X11 displays
ssh -X -l USERNAME teton.arcc.uwyo.edu # For forwarding of X11 displaysssh Access
Teton has login nodes for users to access the cluster. Login nodes are available publicly using the hostname lorenlog1.arcc.uwyo.edu. SSH can be done natively on macOS or Linux based operating systems using the terminal and the ssh command. Although X11 forwarding is supported, and if you need graphical support, we recommend using FastX if at all possible. Additionally, you may want to configure your OpenSSH client to support connection multiplexing if you require multiple terminal sessions. For those instances where you have unreliable network connectivity, you may want to use either tmux or screen once you login to keep sessions alive during disconnects. This will allow you to later reconnect to these sessions.
Users also have direct access to some specialty nodes used for running GUI sessions
ssh USERNAME@lorenlog1.arcc.uwyo.edu
ssh -l USERNAME lorenlog1.arcc.uwyo.edu
ssh -Y -l USERNAME lorenlog1.arcc.uwyo.edu # For secure forwarding of X11 displays
ssh -X -l USERNAME lorenlog1.arcc.uwyo.edu # For forwarding of X11 displaysAccess from Microsoft Windows
ARCC currently recommends that users install MobaXterm to access the Teton cluster. It provides appropriate access to the system with SSH and SFTP capability, allowing X11 if required. The home version of MobaXterm should be sufficient. There is also PuTTY if a more minimal application is desired.
Additional options include, a Cygwin installation with SSH installed or the Windows Subsystem for Linux with an OpenSSH client installed on very recent versions of windows, enabling the OpenSSH client. Finally, a great alternative is to use our FastX capability.