How to use SSH relay server
==========================================

Explanation
---------------------------------

Following limited commands can be used after login to SSH relay server（cms-ssh.sc.imr.tohoku.ac.jp）.


.. csv-table:: command list
   :header: "Command", "Overview"
   :align: left
   :widths: 25, 50

   "ssh", "Login to Front-end node."
   "exit", "Logout from SSH relay server" 
   "passwd", "Change the password for login to front-end node."
   "keydel", "Delete your public key registered in SSH relay server."


Initial display
--------------------------------
Explanation of Limited commands are displayed when you login to SSH relay server.

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   To connect to a front end node, login as follows:
   ----------------------------------------------------------------------
   ssh -l <user> <host> : Go remote host. (do not add any other option.)
   exit : Logout.
   ----------------------------------------------------------------------
   To change your password of Supercomputing system:
   ----------------------------------------------------------------------
   passwd
   ----------------------------------------------------------------------
   To delete your SSH public key:
   ----------------------------------------------------------------------
   keydel
   ----------------------------------------------------------------------


ssh command
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Use ssh command to login to front-end node.

This is how to login to Large-Scale Parallel Computing Server.

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   ssh super.sc.imr.tohoku.ac.jp

This is how to login to Accelerator Server.

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   ssh gpu.sc.imr.tohoku.ac.jp

Execute ssh command and input password.

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   username@super's password:

.. attention::

  If you login to node first time, use initial password you recieved by E-mail.
  If you login to node 2nd times or later, use password you changed.
  You should change initial password when you login first time.  
  Current password is initial password you recieved by E-mail and new password should be setted with following rules.


  (1) Minimum password length is 10.
  (2) Use one or more lower-case letters.
  (3) Use one or more upper-case letters.
  (4) Use one or more numerical digits.

exit command
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Logout from SSH relay server.

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   exit

passwd command
--------------------------------
To change password for login, use passwd command.

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   > passwd
   Please change your password of Supercomputing system now, according to the following policies:
   (1) Minimum password length is 10.
   (2) Use one or more lower-case letters.
   (3) Use one or more upper-case letters.
   (4) Use one or more numerical digits.

   Current password:


.. attention::
  Current password is current password, New password should be setted with following rules.

  (1) Minimum password length is 10.
  (2) Use one or more lower-case letters.
  (3) Use one or more upper-case letters.
  (4) Use one or more numerical digits.


keydel command
---------------------------
Use keydel command to delete your public key.

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   keydel

If press "y", public key is deleted immediatelly.
After executing this command, you need to register again.

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   Are you sure you want to delete your public key? (y/n):