Accessing the cluster

Prerequisites A valid ETH account Local computer with an SSH client Linux and macOS contain SSH client in the operating system Windows users need to install a third party SSH client, e.g., MobaXterm An X11 server for graphical user interface (GUI) (optional) Linux: Xorg is usually installed macOS users need to install XQuartz Windows: MobaXterm includes and enables an X11 server

How to access the cluster

• Start your SSH client
• Use ssh command to connect to the login node of Euler or Leonhard Open

 ssh username@euler.ethz.ch
 ssh username@login.leonhard.ethz.ch

• Use your ETH credentials to log in

For new users and unverified accounts Upon the first login, a verification code should be sent to your ETH email address (username@ethz.ch) Enter the verification code to the prompt An access code has been sent to your ETH email address. Enter the access code at the prompt below. If you do not receive the access code within a few minutes, then contact us by opening a ticket at http://smartdesk.ethz.ch Access code (ending in ******Ls): Accept the cluster’s usage rules upon the first access

Login options To use GUI on the cluster For Windows users, X11 is already included and enabled in MobaXterm. Linux and macOS users have to enable X11 forwarding when log in $ ssh -Y username@euler.ethz.ch $ ssh -Y username@login.leonhard.ethz.ch After a successful login with password, generate SSH keys for passwordless login

Who can access the cluster

Euler Leonhard Open Shareholders who invest in the cluster resources ✓ Euler shareholders ✓ Leonhard Open shareholders External collaborators of shareholders ✓ ✓ Guest users ✓ All ETH members can access Euler as guest users with limited resources ✕

External collaborators Members of other institutions who have a collaboration with a research group at ETH may use the clusters for the purpose of said collaboration Their counterpart (“sponsor”) at ETH can create an ETH guest account, e-mail address and VPN service for them Then, they can access Euler like members of ETH

Security

To connect from outside of the ETH network to the cluster, establish first a VPN connection. Then, connect to the cluster through SSH. To connect from a compute node to an external service, use the ETH proxy service: module load eth_proxy

Legal Compliance

The HPC clusters are subject to ETH’s acceptable use policy for IT resources (Benutzungsordnung für Telematik (BOT)), in particular:

• Cluster accounts are strictly personal
• DO NOT share your account (password, sshkeys) with anyone
• DO NOT use someone else’s account, even if they say it’s OK
• If you suspect that someone used your account, change your password and contact cluster-support@id.ethz.ch

Consequences:

• In case of abuse, the offender’s account may be blocked temporarily or closed
• System administrators are obliged by law to investigate abusive or illegal activities and report them to the relevant authorities

Further reading

• New account request process for HPC clusters
• User guide: Accessing the clusters