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====== Computing and software ======

===== Connecting to the container =====

You can use ssh or RDP to connect the container.


==== Connecting with RDP ====

With RDP, you get a full desktop instead of one terminal like in ssh connection. The client software is installed by default in Windows and in most linux distributions (remmina). With Mac, you have to install the free client from the standard Apple software sources (Microsoft Remote Desktop). 


**IMPORTANT: please click //logout// when leaving the session instead of just killing the window.** If you kill the window, the session wil stay running and eventually we have to boot the container to get rid of stale sessions.

We will use a standard port in the connection, so appending a port number (e.g 42000 in the images) is not necessary (leave it out in the examples).
   
=== In Mac: ===

{{:imaging_course_2018:screen_shot_2018-05-19_at_11.29.10.png?400|}}

=== In Linux (remmina): ===

{{:imaging_course_2018:screenshot_from_2018-05-20_11-50-00.png?400|}}

=== In Windows 10 ===

Use case 2 in the following link: Use Remote Desktop to connect to the PC you set up

https://support.microsoft.com/en-us/help/4028379/windows-10-how-to-use-remote-desktop


==== Keyboard layout in RDP ====

Unfortunately the layout with RDP connection is US/English and it cannot be changed.

===== Using SSH to connect =====

In case of ssh, the command is

   ssh -Y USER@tube.utu.fi
   
on Linux.

==== Possible but not probable SSH key problem ====

If you get an error message like this:

   @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
   @    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @
   @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
   IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
   Someone could be eavesdropping on you right now (man-in-the-middle attack)!
   It is also possible that a host key has just been changed.
   The fingerprint for the ECDSA key sent by the remote host is
   c4:98:bb:5e:73:fa:e7:0c:94:2c:5b:7c:33:e6:ea:7c.
   Please contact your system administrator.
   Add correct host key in /home/juanauh/.ssh/known_hosts to get rid of this message.
   Offending ECDSA key in /home/juanauh/.ssh/known_hosts:26
     remove with: ssh-keygen -f "/home/juanauh/.ssh/known_hosts" -R tube.utu.fi
   ECDSA host key for tube.utu.fi has changed and you have requested strict checking.
   Host key verification failed.

Then do what it says :-)! As an example: 

   ssh-keygen -f "/home/juanauh/.ssh/known_hosts" -R tube.utu.fi

Of course you have to use the command line that is in the actual error message.

===== Setting up the software =====

Note: you have to do the following every time you open up a new window!

In your current terminal, type
''scisoft''
to activate the software.

<del>For backup also another system is available. In that case type
''iraf27''</del>

===== Observing data =====

Data from NOT instruments is automatically downloaded to ''/coursedata'' in the course container.


==== Enjoy! ====
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