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Passwordless SSH

You may setup a SSH key to access the cluster front ends (and compute nodes) within the CCI without being prompted for a password.

Note, passwordless SSH is not supported on the landing pads.

This is a requirement for running parallel applications with using mpirun and some other frameworks that use SSH as part of their backend function.


To setup a passwordless SSH key, perform the steps below from any node:

  1. Connect to any of the landing pads via SSH with using your password
  2. Run: ssh-keygen -t rsa Accept defaults, do not set password
  3. Run: cat ~/.ssh/ >> ~/.ssh/authorized_keys


If asked for a password after setting up keys, check the permissions of the files in your ~/.ssh directory.

Set proper permissions
`chmod 600 ~/.ssh/id_rsa`

`chmod 644 ~/.ssh/`

`chmod 644 ~/.ssh/authorized_keys`
Working example

SSH keyfile permissions