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USER CONFIGURATION
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Enabling password-less login from A to B

 cd ~/.ssh
 ssh-keygen -t rsa
 ssh-keygen -t dsa
 cat id_rsa.pub id_dsa.pub >> authorized_keys2

Still having problems? Check for firewalls!


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More general instructions (also for computers where 
the home directory is not shared as on the cluster:

3 steps:
- generate a identity file on A
- copy it over to B
- add this file to the list of authorized login

The following works for ssh2:

1) on A:

>>> ssh-keygen -t rsa
Hit return on each question (3)

>>> ssh-keygen -t dsa
Hit return on each question (3)

2) copy *pub files from A to B:

>>> cd ~/.ssh
>>> scp id_dsa.pub "B:.ssh/id_dsa.pub-Bis"
>>> scp id_rsa.pub "B:.ssh/id_rsa.pub-Bis"

3) on B "authorize" login from A:

>>> ssh B
>>> cd $HOME/.ssh (you might need to create it )
>>> cat id_rsa.pub-Bis  id_dsa.pub-Bis  >> authorized_keys2

Or download and use ssh-keyinstall to set up your system:
http://www.stearns.org/ssh-keyinstall/