1.1. Node name of the supercomputing system in CCMS

Host List

Destinatin host

Node name

Remarks

SSH relay server

cms-ssh.sc.imr.tohoku.ac.jp

This server acts as an intermediary for SSH connections from user PCs to the frontend servers. Only limited commands can be executed.

Large-scale Parallel Computing Server

super.sc.imr.tohoku.ac.jp

This node handles job submission.

Accelerator Server

gpu.sc.imr.tohoku.ac.jp

This node handles job submission. This node can refer to GPU information.
../_images/SSH-Login_eng.jpg

1.2. Register SSH Public Key

If you are connected to supercomputer for the first time, generate a pair of public and private keys using, public key registration system The private key will be downloaded to your computer. Please see the SSH public key registration system manual .

1.3. How to login servers

Here is how to login using SSH commands.

1.3.1. Configuration SSH keys

Generate a pair of public and private keys using SSH public key registration system . The private key will be sent to your email address so copy it to ~/.ssh.

1.3.2. modify ssh config file

Create the ~/.ssh/config and edit as follows. Replace username with your User ID and replace ~/.ssh/keys/id_rsa with location of your id_rsa file.

Host *.sc.imr.tohoku.ac.jp
    User username
Host cms-ssh.sc.imr.tohoku.ac.jp
    HostName cms-ssh.sc.imr.tohoku.ac.jp
    IdentityFile ~/.ssh/keys/id_rsa
Host super.sc.imr.tohoku.ac.jp gpu.sc.imr.tohoku.ac.jp
    ProxyJump cms-ssh.sc.imr.tohoku.ac.jp
Host super.sc.imr.tohoku.ac.jp
    HostName super.sc.imr.tohoku.ac.jp
Host gpu.sc.imr.tohoku.ac.jp
    HostName gpu.sc.imr.tohoku.ac.jp

1.3.3. Additional setting for ssh_config

Add the following contents to ~/.ssh/config when you use Materials Studio installed in your own environment.

Host cmsmsgw.sc.imr.tohoku.ac.jp
    HostName cmsmsgw.sc.imr.tohoku.ac.jp
Host ms.sc.imr.tohoku.ac.jp
    HostName super.sc.imr.tohoku.ac.jp
    ProxyJump cms-ssh.sc.imr.tohoku.ac.jp
    LocalForward 28888 cmsmsgw.sc.imr.tohoku.ac.jp:18888

1.3.4. Confirm the connection

This is an example how to login to Large-Scale Parallel Computing Server (super.sc.imr.tohoku.ac.jp).

[username@machine]$ ssh super.sc.imr.tohoku.ac.jp
Enter passphrase for key ‘/home/username/.ssh/keys/id_rsa’: passphrase
password: password
    Last login: Wed Jul 25 17:20:44 2018 from 130.34.224.22

Disk quotas for user username (uid 12345):
   Filesystem   kbytes   quota   limit    grace   files   quota   limit   grace
   /home 89669752  2621440000 2883584000        -   903339        0        0        -
username@super1:~>

This is an example how to login to Accelerator Server (gpu.sc.imr.tohoku.ac.jp).

[username@machine]$ ssh gpu.sc.imr.tohoku.ac.jp
Enter passphrase for key ‘/home/username/.ssh/keys/id_rsa’: passphrase
username@gpu.sc.imr.tohoku.ac.jp’s password: password
    Last login: Wed Jul 25 20:25:31 2018 from 130.34.224.22

Disk quotas for user username (uid 12345):
   Filesystem   kbytes   quota   limit    grace   files   quota   limit   grace
   /home 89669752  2621440000 2883584000        -   903339        0        0        -
username@gpu1:~>

Enter your passphrase at first. Then, please enter the initial password which was sent by mail, if you have not logged in our system yet. Otherwise, enter the password which was set by yourself. If the prompt is displayed, the login is successful. Please change your initial password at first log-in to our system, 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.