[[computing:cluster:pripojeni:start|{{:up1.png?direct|}}]]
[[computing:cluster:pripojeni:start|Connections]]


==== Connecting to the kraken server on Windows - outside the ÚT network ====

It is also possible to connect to the kraken server from the Internet outside the UT network. Compared to logging in from the internal network, there are the following differences:

  * you log in to the server <wrap hi>zuul.it.cas.cz</wrap> (gateway for redirection to kraken-M1)
  * the port <wrap hi>7222</wrap> is used
  * connection is only possible to the admin node "kraken"

=== Linux ===

In Linux, use the ssh command as follows:


  ssh -Yp 7222 uživatel@zuul.it.cas.cz

=== Windows ===

The SSH client is not part of Windows and needs to be installed. The most commonly used client is PuTTY. 

The [[http://www.putty.org//|PuTTY]] client is a client for SSH, Telnet, rlogin and plain TCP protocols. It is developed as open source software. The latest version can be downloaded [[http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html|here]].
The program consists of a single exe file, which you can place in e.g. the directory ''"c:\program files\putty"''.

If you are going to run GUI programs (MATLAB) on the server, you must have an X server installed. The recommended one is
[[http://vcxsrv.sourceforge.net/|VcXsrv Windows X Server]], which is available in both 32-bit and 64-bit versions. 

=== Configuring the program ===

  * 1. Run the ''putty'' program. In the <wrap round box>Host name (or IP address)</wrap> field, type <wrap hi>zuul.it.cas.cz</wrap>. \\ In the <wrap round box>Port</wrap> field, type <wrap hi>7222</wrap>.

{{:computing:cluster:navody:putty_out:putty2b-zulu.png?direct|}}

~~SP~~

  * 2. Go to the program configuration, tab <wrap hi>Connection -> SSH -> Auth -> X11</wrap>. Check the <wrap round box>Enable X11 forwarding</wrap>.

{{:computing:cluster:navody:putty:putty1b.png?direct|}}

~~SP~~

  * 3. Return to the <wrap hi>Session</wrap> home tab and in the <wrap round box>Saved Sessions</wrap> field, type the name under which your session will be saved.
  * 4. Click the <wrap round box>Save</wrap> button to save the configuration.
  * 5. Use the <wrap round box>Open</wrap> button to start the connection.


{{:computing:cluster:putty3b-zulun.png?direct|}}

~~SP~~

----

If you want to use programs with a graphical interface (e.g. MATLAB) on the server, you need to run VcXsrv X Server before connecting. Go to <wrap hi>VcXsr</wrap> in the programs menu and run the <wrap hi>VcXsr</wrap> program.

{{:computing:cluster:navody:putty:vcxsrv1b.png?direct&300|}}

If the X server is running, its icon will appear in the tray.

{{:computing:cluster:navody:putty:vcxsrv2b.png?direct|}}

----

  * 6. A terminal window opens and login is initiated.
  * 7. <wrap em>If you are logging in for the first time</wrap>, a warning window appears. PuTTY does not "know" the remote server and asks if the server is trusted. Answer <wrap round box>Yes</wrap>.

{{:computing:cluster:navody:putty:putty4bn.png?direct|}}

~~SP~~

  * 8. A terminal window opens and the login process begins. You will be prompted for a username and password. If you have entered both correctly, you will be logged in.

{{:computing:cluster:navody:putty:putty5bn.png?direct|}}

~~SP~~

  * 9. <wrap em>If you are logging in for the first time</wrap>, you need to change your password. To change your password, use the <wrap hi>''passwd''</wrap> command. You must first enter your current password.

{{:computing:cluster:navody:putty:putty6bn.png?direct|}}

~~SP~~

  * 10. Then enter a new password. If the password you choose is too simple, the server will not approve the password and will prompt you to choose a more complex password. 
  * 11. You ask for the new password again to check it.
/* 12. If you have successfully changed the password on the kraken-M1 node, it will be automatically copied to the remaining nodes (M1 - M6). You do not need to "manually" change the password on the other nodes.
   13. The same procedure is used to change the password on the L
*


{{:computing:cluster:navody:putty:putty7bn.png?direct|}}