Q-Logic IB6054601-00 D Manuel D’Utilisation

3 – Using InfiniPath MPI
InfiniPath MPI Details

3-6

IB6054601-00 D

The process is shown in the following steps:

1. Create a key pair. Use the default file name, and be sure to enter a passphrase.

$ ssh-keygen -t rsa

2. Enter a passphrase for your key pair when prompted. Note that the key agent

does not survive X11 logout or system reboot:

$ ssh-add

3. This tells

ssh

that your key pair should let you in:

$ cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys

edit ~/.ssh/config so that it reads like this:

Host*

ForwardAgent yes

ForwardX11 yes

CheckHostIP no

StrictHostKeyChecking no

This forwards the key agent requests back to your desktop. When you log into
a front end node, you can ssh to compute nodes without passwords.

4. Start ssh-agent by adding the following line to your ~/.bash_profile (or

equivalent in another shell):

eval ‘ssh-agent‘

Use back-quotes rather than normal single-quotes. Programs started in your
login shell will then be able to locate

ssh-agent

and query it for keys.

5. Finally, test by logging into the front end node, and from the front end node to

a compute node as follows:

$ ssh frontend_node_name

$ ssh compute_node_name

For more information, see the man pages for

ssh(1),ssh-keygen(1)

ssh-add(1)

, and

ssh-agent(1)

Alternatively, the cluster administrator can accomplish this for all users through the

shosts.equiv

mechanism, as described in