Login

Questions

• How to reach UPPMAX clusters?

• Where do I arrive when I log in? Login or calculation node?

• What clients should/could I use for my work at UPPMAX?

• How can I enable graphics?

Objectives

• We’ll go through platform specific (Mac/Linux/Windows) ways to log in to UPPMAX

• See different clients

• Enable graphics

• Try yourself!

Instructor note

• Approx timing: 9:30-9:55

• Demos/type-alongs

Note

If you lack a user account, visit the Getting started page

General understanding

• When logging in to UPPMAX from your local computer you will arrive to your home folder at the login node.

• This means that only light analysis and and calculations should be made here.

• You will see this in the prompt after “@” as the clustername and a low number. For instance:

     [<user>@rackham3 linux_tutorial]$
  

• You will later learn how to reach the calculation nodes. Then the prompt states the node number with a single letter, like “r” for Rackham. For instance:

     [<user>@r484 linux_tutorial]
  

The login

Login procedure

Which login procedure is best for You, depends on:

• Your background

• Your OS environment,

• Your planned interaction with your local computer

• Your planned use of graphics on the cluster

• We will use Rackham for the course

See the documentation

• Get inside SUNET

• Log in to Rackham

Exercises

Log in with a ternminal

• Use any tool that you have installed

Log in with a ternminal but enable graphics

• Use any tool that you have installed http://docs.uppmax.uu.se/getting_started/login_rackham/#terminal-with-x11-server-and-light-graphics

Solution

• First try:

$ ssh -Y <username>@rackham.uppmax.uu.se

• If you receive errors or warnings, instead try:

$ ssh <username>@rackham.uppmax.uu.se

• If you do have X11 installed:

$ xeyes &

Try Thinlinc from web

• Try the web version now if you don’t already have the software installed!

• http://docs.uppmax.uu.se/getting_started/login_rackham/#thinlinc-all-platforms

Login procedure

If you plan to:

• do day-to-day work where terminal shell is sufficient

  • Mac: Terminal, iTerm2

  • Linux: Terminal

  • Windows: Putty, Windows Powershell or even command prompt (CMD)

• interact with your local computer

  • Mac/Linux: you can always work in a local shell (mutiple terminal windows open)

    • (S)FTP browser: Filezilla, Cyberduck

  • Windows

    • (S)FTP browser: WinSCP

    • MobaXterm has built-in SFTP browser

    • you may benefit from having a Windows Subsystem for Linux, WSL(2)

• do day-to-day work with some graphical applications (X forwarding)

  • Mac: Terminal, iTerm2 + XQuartz

  • Linux: Terminal

  • Windows: MobaXterm

• integrate you cluster work with code development

  • All OS: Example Visual Studio Code

• use sophistic graphical interfaces like RStudio and MATLAB etcetera

  • ThinLinc application

• use Bianca

  • ThinLinc from web

Keypoints

• When you log in from your local computer you will always arrive at a login node with limited resources.

• You reach the calculations nodes from within the login node (See Submitting jobs section)

• You reach UPPMAX clusters either using a terminal client or Thinlinc

• Graphics are included in Thinlinc and from terminal if you have enabled X11.

• Which client to use?

• Graphics and easy to use

  • ThinLinc

• Best integrated systems

  • Visual Studio Code has several extensions (remote, SCP, programming IDE:s)

  • Windows: MobaXterm is somewhat easier to use.