## page was renamed from Computing/LIP_Lisbon_Farm/How_To_Access
## page was renamed from Computing/LIP_Farm/How_To_Access
## page was renamed from Computing/LIP_Farm/Access
<<TableOfContents()>>

= Access =


 * The access to LIP FARM it's done by ssh with public key to a remote machine based on RedHat: pauli.ncg.ingrid.pt


 * The pauli machine it's a cluster and it's composed by several machines: pauli01, pauli02, ....  The access it's based on round-robin meaning for consecutive logins the users will be redirected to a different machine. 

 
{{{
host pauli.ncg.ingrid.pt
pauli.ncg.ingrid.pt has address 193.136.75.169
pauli.ncg.ingrid.pt has address 193.136.75.174
pauli.ncg.ingrid.pt has address 193.136.75.176
....
}}}

 * For '''outside access users''' should always use the lnlip01/02 under lip.pt domain.   


= Authentication: ssh + key  =

 * The  authentication for the LIP FARM it's done exclusively trough ssh with public key. 
 * In order to generate a pair of private/public keys the user should run in there local machine the ssh-keygen command. 
'''IMPORTANT : please choose a good password'''


{{{
$ ssh-keygen -b 4096
Generating public/private rsa key pair.
Enter file in which to save the key (/home/username/.ssh/id_rsa): 
Created directory '/home/username/.ssh'.
Enter passphrase (empty for no passphrase):           
Enter same passphrase again:                          
Your identification has been saved in /home/username/.ssh/id_rsa.
Your public key has been saved in /home/username/.ssh/id_rsa.pub.
The key fingerprint is:
a8:60:b3:73:aa:ed:7f:bf:88:32:7a:fc:9d:00:1d:1d username@mydesktop
The key's randomart image is:
+--[ RSA 2048]----+
|      E          |
|     . .         |
|    . .          |
|   . . .         |
|  = . . S        |
| . = .           |
| .o +            |
| .=+ +.o         |
|o=+=+.+.o.       |
+-----------------+

}}}

 * By default the pair of keys generated by ssh-keygen command will be created in the  ~/.ssh/ folder. '''Never share your private key (id_rsa)!!!'''

{{{
cd 
ls -l ~/.ssh/
total 8
-rw------- 1 username group 1743 Feb 19 10:52 id_rsa
-rw-r--r-- 1 username group  404 Feb 19 10:52 id_rsa.pub
}}}

 * Finally you should send the id_rsa.pub to helpdesk@lip.pt together with your username and corresponding group.

= Login =

{{{
ssh -A -l username pauli.ncg.ingrid.pt
}}}