= Hints for using the Cray-XC30 at HLRN =

* running remote jobs 

== running remote jobs ==

Starting from r1255,  PALM allows full remote access of the Berlin complex of HLRNIII. Since the batch compute nodes do not allow to use ssh/scp (which is required by '''mrun''' for carrying out several crucial tasks, e.g. for automatic submission of restart runs), the ssh/scp commands are executed on one of the login nodes (blogin1) as a workaround. Therefore, blogin1 must be a known host for ssh/scp. This requires the user to carry out the following three steps just once:

   1. Login on blogin and create a pair of private/public ssh-keys (replace <hlrn-username> by your HLRN-username):
{{{
      ssh <hlrn-username>@blogin1.hlrn.de
      ssh-keygen -t dsa
}}}
      Enter <return> for any query, until the shell-prompt appears again.

   2. On blogin, define the public key as one of the authorized keys to access the system:
{{{
      cat  id_dsa.pub  >>  authorized_keys
}}}
   3. Still logged in on blogin, login on blogin1:
{{{
      ssh <hlrn-username>@blogin1
}}}
   After the third step, the message
{{{
Warning: Permanently added 'blogin1,130.73.233.1' (RSA) to the list of known hosts.
}}}
   should appear on the terminal.