Sokolova-lapa at 14:02, 11 April 2018

2018-04-11T14:02:11Z

Sokolova-lapa: Created page with " Category:Working Remotely = Working remotely using SSH = If you want to connect to a machine at Remeis from remote you can use, e.g., SSH. This is a secured connection..."

2018-04-11T14:00:20Z

Created page with " Category:Working Remotely = Working remotely using SSH = If you want to connect to a machine at Remeis from remote you can use, e.g., SSH. This is a secured connection..."

New page

[[Category:Working Remotely]]

= Working remotely using SSH =

If you want to connect to a machine at Remeis from remote you can use, e.g., SSH. This is a secured connection, which forwards a shell on the machine to your local computer.

=== Linux ===

On a linux system, you need to have SSH installed. On Debian based system, such as Ubuntu, that can be achieved by
<pre>
sudo apt-get install ssh
</pre>
Once SSH is installed, just type
<pre>
ssh username@constellation.sternwarte.uni-erlangen.de
</pre>
into your local shell. Replace username by your login at Remeis and constellation by the name of the machine at Remeis, e.g., leo. You will be then asked by your password. You may use [[SSH-Keys|SSH-Keys]] to avoid entering you password.

It is also possible to enabled X11 forwarding with the -X option, which allows you to open window-based applications, such as konqueror or pgplot:
<pre>
ssh -X username@constellation.sternwarte.uni-erlangen.de
</pre>
In that case the window opens at your local machine. Be aware that X11 forwarding requires a lot of bandwidth, which will slow down the windows and any actions you do significantly. To slightly increase the speed you can choose to compress the commands between bots machines via
<pre>
ssh -X -C username@constellation.sternwarte.uni-erlangen.de
</pre>

==== SSH-Keys ====

To avoid typing in your password at the remove machine every time you log in, you might consider installing [[SSH-Keys|SSH-Keys]].

==== Screen ====

Sometimes, a ssh session will terminate due to the error "Write failed: broken pipe" or something similar.
As this can have various reasons, the best is to use <code>screen</code> in any case.
This allows you to attach and detach a running remote terminal session at any time.
This way, you can run a job on screen, detach the session, switch off the laptop, and resume this remote session later.

To start the screen session type
<pre>
screen
</pre>
To detach it:
<pre>
Cntr-a-d
</pre>
To resume it later:
<pre>
screen -r -d
</pre>

The only disadvantage (unable to scroll back) is no, if you add this to your ~/.screenrc:
<pre>
termcapinfo xterm ti@:te@
termcapinfo xterm-color ti@:te@
</pre>

=== Windows ===

If your local computer is running Windows as operating system you need to download and install a SSH-client, such as [[http://www.putty.org/|PuTTY]]. A guide how to use Putty is available here:
[[http://the.earth.li/~sgtatham/putty/0.64/htmldoc/Chapter2.html#gs]]

@@ Line 60: / Line 60: @@
 === Windows ===
-If your local computer is running Windows as operating system you need to download and install a SSH-client, such as [[http://www.putty.org/|PuTTY]]. A guide how to use Putty is available here:
+If your local computer is running Windows as operating system you need to download and install a SSH-client, such as [[http://www.putty.org/ PuTTY]]. A guide how to use Putty is available here:
 [[http://the.earth.li/~sgtatham/putty/0.64/htmldoc/Chapter2.html#gs]]

SSH - Revision history

Sokolova-lapa at 14:02, 11 April 2018

Sokolova-lapa: Created page with " Category:Working Remotely = Working remotely using SSH = If you want to connect to a machine at Remeis from remote you can use, e.g., SSH. This is a secured connection..."