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Shell access and data transfer
==============================
Interactive Login
-----------------
The Anselm cluster is accessed by SSH protocol via login nodes login1
and login2 at address anselm.it4i.cz. The login nodes may be addressed
specifically, by prepending the login node name to the address.
Login address |Port|Protocol| Login node
----------------------- |---|---| ----------------------------------------------
anselm.it4i.cz |22|ssh| round-robin DNS record for login1 and login2
login1.anselm.it4i.cz |22|ssh| login1
login2.anselm.it4i.cz |22|ssh| login2
The authentication is by the [private
key](../../../get-started-with-it4innovations/accessing-the-clusters/shell-access-and-data-transfer/ssh-keys.html)
Please verify SSH fingerprints during the first logon. They are
identical on all login nodes:
29:b3:f4:64:b0:73:f5:6f:a7:85:0f:e0:0d:be:76:bf (DSA)
d4:6f:5c:18:f4:3f:70:ef:bc:fc:cc:2b:fd:13:36:b7 (RSA)
Private key (`id_rsa/id_rsa.ppk` ): `600 (-rw-------)`s authentication:
On **Linux** or **Mac**, use
`
local $ ssh -i /path/to/id_rsa username@anselm.it4i.cz
`
If you see warning message "UNPROTECTED PRIVATE KEY FILE!", use this
command to set lower permissions to private key file.
`
local $ chmod 600 /path/to/id_rsa
`
On **Windows**, use [PuTTY ssh
client](../../../get-started-with-it4innovations/accessing-the-clusters/shell-access-and-data-transfer/putty/putty.html).
After logging in, you will see the command prompt:
_
/ | |
/ _ __ ___ ___| |_ __ ___
/ / | '_ / __|/ _ | '_ ` _
/ ____ | | | __ __/ | | | | | |
/_/ __| |_|___/___|_|_| |_| |_|
http://www.it4i.cz/?lang=en
Last login: Tue Jul 9 15:57:38 2013 from your-host.example.com
[username@login2.anselm ~]$
The environment is **not** shared between login nodes, except for
[shared filesystems](../storage-1.html#section-1).
Data Transfer
-------------
Data in and out of the system may be transferred by the
[scp](http://en.wikipedia.org/wiki/Secure_copy) and sftp
protocols. (Not available yet.) In case large
volumes of data are transferred, use dedicated data mover node
dm1.anselm.it4i.cz for increased performance.
|Address|Port|Protocol|
-------------------- |---|---|- -----------------------------------------
|anselm.it4i.cz|22|scp, sftp|
|login1.anselm.it4i.cz|22|scp, sftp|
|login2.anselm.it4i.cz|22|scp, sftp|
|dm1.anselm.it4i.cz|22|scp, sftp|
The authentication is by the [private
key](../../../get-started-with-it4innovations/accessing-the-clusters/shell-access-and-data-transfer/ssh-keys.html)
Data transfer rates up to **160MB/s** can be achieved with scp or sftp.
may be transferred in 1:50h.
To achieve 160MB/s transfer rates, the end user must be connected by 10G
line all the way to IT4Innovations and use computer with fast processor
for the transfer. Using Gigabit ethernet connection, up to 110MB/s may
be expected. Fast cipher (aes128-ctr) should be used.
If you experience degraded data transfer performance, consult your local
network provider.
On linux or Mac, use scp or sftp client to transfer the data to Anselm:
`
local $ scp -i /path/to/id_rsa my-local-file username@anselm.it4i.cz:directory/file
`
`
local $ scp -i /path/to/id_rsa -r my-local-dir username@anselm.it4i.cz:directory
`
or
`
local $ sftp -o IdentityFile=/path/to/id_rsa username@anselm.it4i.cz
`
Very convenient way to transfer files in and out of the Anselm computer
is via the fuse filesystem
[sshfs](http://linux.die.net/man/1/sshfs)
`
local $ sshfs -o IdentityFile=/path/to/id_rsa username@anselm.it4i.cz:. mountpoint
`
Using sshfs, the users Anselm home directory will be mounted on your
local computer, just like an external disk.
Learn more on ssh, scp and sshfs by reading the manpages
`
$ man ssh
$ man scp
$ man sshfs
`
On Windows, use [WinSCP
client](http://winscp.net/eng/download.php) to transfer
the data. The [win-sshfs
client](http://code.google.com/p/win-sshfs/) provides a
way to mount the Anselm filesystems directly as an external disc.
More information about the shared file systems is available
[here](../../storage.html).