Connecting to the cluster

User interfaces

There are several options users may take to work on the cluster:

  • command line (remote terminal);
  • graphical interface of application software (GUI);
  • web interface.

Command line

This is a traditional manner of accessing the cluster. A user uses Internet to connect to a remote terminal (through a secure shell (SSH) protocol usually) where commands can be executed in a text mode. It is possible to edit and compile a code, place a job (simulation) in the queue and monitor the course of execution of the job. Instructions in this manual are mainly related to the access form using a command line.

Graphical tools can also be called from a command line (more information in the section Graphical tools).

Graphical interface of application software

Some software packages (like Schrodinger, MATLAB, etc.) have an inbuilt support for parallel computing on a cluster. A user can choose to either perform a simulation locally or queue it, without leaving the regular software environment. In case of such software like Schrodinger, the cluster can be used by opening the graphical interface either locally on the personal computer or remotely on the cluster login node.

Web interface

Access to the cluster using a HTTP protocol or by opening a graphical interface (portal) on an Internet browser. See the example in the image — Moab Viewpoint interface.

 

Access to command line

Work on the cluster is performed using a login node with Linux environment and special cluster client tools.

Command line parameters

Authorise with login and password you received after completing registration for working with the cluster.

Server address: 85.254.226.76 (ui-1.hpc.rtu.lv)

Protocol: SSH

Port:22

Access is supported from any IP address.

Tools for accessing command line

The login node command line is accessed remotely from a user’s computer using an SSH protocol. It can be done with the following tools (Linux and MacOS environment).

  • Linux or MacOS:
  1. Open command line (terminal);
  2. Use SSH client program, by typing:
ssh -p [port] [username]@[hostname] 

For example:

ssh -p 22 username@ui-1.hpc.rtu.lv
  • MS Windows

Use the SSH client program PuTTY, which can be downloaded from: http://www.putty.org/.