SSH and SCP - Revision history

Lothar.brendel: /* SCP */ no staff

2024-01-24T15:28:44Z

SCP: no staff

← Older revision		Revision as of 17:28, 24 January 2024
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	<code>scp -pr <username>@asterope.agk.uni-due.de:asterope-home/some/folder/somewhere/somedata.data</code>		<code>scp -pr <username>@asterope.agk.uni-due.de:asterope-home/some/folder/somewhere/somedata.data</code>

	To transfer data from Asterope to your local machine while using the VPN, I use a two-step system where I first transfer the data into a clipboard folder on the staff server and afterwards onto my local machine. The needed commands for this version are:

	~~<code>scp -pr -P 54321 <username>@localhost:/homes/<username>/asterope-home/some/folder/somewhere/somedata.data clipboard/</code>~~

	~~<code>scp -pr -4 <username>@staff.uni-due.de:clipboard/somedata.data /home/some/path/to/somewhere/</code>~~

	The <code>-r</code> is needed to copy folders and not just single files, the <code>-P</code> to specify a port to which to connect to. Note that for <code>scp</code>, in contrast to <code>ssh</code>, this <code>p</code> is uppercase. The direct forwarding from above works here as well, just replace the <code>-p</code> flag by <code>-P</code>.		The <code>-r</code> is needed to copy folders and not just single files, the <code>-P</code> to specify a port to which to connect to. Note that for <code>scp</code>, in contrast to <code>ssh</code>, this <code>p</code> is uppercase. The direct forwarding from above works here as well, just replace the <code>-p</code> flag by <code>-P</code>.

Lothar.brendel: /* From outside of the university */ no staff

2024-01-24T15:27:36Z

From outside of the university: no staff

@@ Line 16: / Line 16: @@
 <code>sudo forcepoint-client vpn.uni-due.de --resolver /usr/bin/resolvectl</code>
-Since the university does not allow direct forwarding to the group servers we need to take a detour over the staff server. This is done by the following command:
+The university does not allow direct login to the group servers, yet.
 == SCP ==

Gabriel: Style

2023-12-30T11:25:41Z

Style

← Older revision		Revision as of 13:25, 30 December 2023
Line 5:		Line 5:
	=== Inside the university ===		=== Inside the university ===

	To connect to Asterope or Merope simply use, where <code><~~USERNAME~~></code> has the format <code>xyz123a</code>, the command:		To connect to Asterope or Merope simply use, where <code><username></code> has the format <code>xyz123a</code>, the command:

	<code>ssh <~~USERNAME~~>@asterope.agk.uni-due.de</code>		<code>ssh <username>@asterope.agk.uni-due.de</code>

	=== From outside of the university ===		=== From outside of the university ===

Gabriel: Clarity

2023-12-30T10:59:48Z

Clarity

← Older revision		Revision as of 12:59, 30 December 2023
Line 20:		Line 20:
	<code>ssh -4 <username>@staff.uni-due.de</code>		<code>ssh -4 <username>@staff.uni-due.de</code>

	~~The <code>-4</code> specifies to use IPv4 for the connection.~~ Then, to connect to Asterope:		Then, to connect to Asterope:

	<code>ssh -p 54321 localhost</code>		<code>ssh -p 54321 localhost</code>

	The <code>-p</code> ~~tells~~ <code>~~ssh~~</code> specifies the port for the connection. From ~~there~~, you can do simply <code>ssh merope</code> to reach Merope (as the same user).		The <code>-4</code> specifies to use IPv4 and <code>-p</code> specifies the port for the connection. From Asterope, you can do simply <code>ssh merope</code> to reach Merope (as the same user).

	To get a direct pipeline to Asterope you can use		To get a direct pipeline to Asterope you can use

Gabriel: Extra line deleted

2023-12-30T10:58:22Z

Extra line deleted

← Older revision		Revision as of 12:58, 30 December 2023
Line 8:		Line 8:

	<code>ssh <USERNAME>@asterope.agk.uni-due.de</code>		<code>ssh <USERNAME>@asterope.agk.uni-due.de</code>


	=== From outside of the university ===		=== From outside of the university ===

Gabriel: Formatting, clarity

2023-12-30T10:57:52Z

Formatting, clarity

← Older revision		Revision as of 12:57, 30 December 2023
Line 5:		Line 5:
	=== Inside the university ===		=== Inside the university ===

	To connect to Asterope or Merope simply use the command		To connect to Asterope or Merope simply use, where <code><USERNAME></code> has the format <code>xyz123a</code>, the command:

			<code>ssh <USERNAME>@asterope.agk.uni-due.de</code>

	~~<code>ssh cbi586j@asterope.agk.uni-due.de</code>~~

	=== From outside of the university ===		=== From outside of the university ===
Line 20:		Line 21:
	<code>ssh -4 <username>@staff.uni-due.de</code>		<code>ssh -4 <username>@staff.uni-due.de</code>

	~~followed by~~		The <code>-4</code> specifies to use IPv4 for the connection. Then, to connect to Asterope:

	<code>ssh -p 54321 localhost</code>		<code>ssh -p 54321 localhost</code>

	to ~~connect to Asterope~~.		The <code>-p</code> tells <code>ssh</code> specifies the port for the connection. From there, you can do simply <code>ssh merope</code> to reach Merope (as the same user).

	~~The <code>-4</code> specifies to use IPv4 for the connection and the <code>-p</code> tells ssh~~ to use ~~a specific port for the connection.~~		To get a direct pipeline to Asterope you can use

	~~To get a direct pipeline you can use~~		<code>ssh -p 54321 -J <username>@staff.uni-due.de <username>@localhost</code>

	<code>~~ssh~~ -~~p 54321 -J~~ <~~username~~>~~@staff.uni-due.de~~ <~~username~~>~~@localhost~~</code>		If you want graphics windows, use the <code>-X</code> flag with the <code>ssh</code> call(s).

	== SCP ==		== SCP ==

Gabriel: Info on -p flag added

2023-12-30T10:35:13Z

Info on -p flag added

← Older revision		Revision as of 12:35, 30 December 2023
Line 36:		Line 36:
	SCP from inside the university network is very straightforward. The needed command is		SCP from inside the university network is very straightforward. The needed command is

	<code>scp -r <username>@asterope.agk.uni-due.de:asterope-home/some/folder/somewhere/somedata.data</code>		<code>scp -pr <username>@asterope.agk.uni-due.de:asterope-home/some/folder/somewhere/somedata.data</code>

	To transfer data from Asterope to your local machine while using the VPN, I use a two-step system where I first transfer the data into a clipboard folder on the staff server and afterwards onto my local machine. The needed commands for this version are:		To transfer data from Asterope to your local machine while using the VPN, I use a two-step system where I first transfer the data into a clipboard folder on the staff server and afterwards onto my local machine. The needed commands for this version are:

	<code>scp -r -P 54321 <username>@localhost:/homes/<username>/asterope-home/some/folder/somewhere/somedata.data clipboard/</code>		<code>scp -pr -P 54321 <username>@localhost:/homes/<username>/asterope-home/some/folder/somewhere/somedata.data clipboard/</code>

	<code>scp -r -4 <username>@staff.uni-due.de:clipboard/somedata.data /home/some/path/to/somewhere/</code>		<code>scp -pr -4 <username>@staff.uni-due.de:clipboard/somedata.data /home/some/path/to/somewhere/</code>

	The <code>-r</code> is needed to copy folders and not just single files, the <code>-P</code> to specify a port to which to connect to. Note that for scp, in contrast to ssh, this p ~~has to be~~ uppercase.		The <code>-r</code> is needed to copy folders and not just single files, the <code>-P</code> to specify a port to which to connect to. Note that for <code>scp</code>, in contrast to <code>ssh</code>, this <code>p</code> is uppercase. The direct forwarding from above works here as well, just replace the <code>-p</code> flag by <code>-P</code>.
	The direct forwarding from above works here as well, just replace the <code>-p</code> flag by <code>-P</code>.
			It is good practice to use the (lowercase) <code>-p</code> flag (note how flags ''can'' be written together: <code>-pr4</code> or <code>-p -r -4</code> would also work) to preserve the timestamp on the file(s); otherwise, the timestamp is set to the time of copy, which is "not true" and possibly confusing (the file was not modified, just transfered).

			A more powerful command that is resilient to network interruptions, has optimisations that are important especially for large files, etc. is <code>rsync</code>.

imported>admsys at 14:15, 7 September 2023

2023-09-07T14:15:25Z

New page

We need the SSH and SCP commands to access the different clusters of the group. As soon as your user ID is working, Lothar can give you access to the two [[servers]] Asterope and Merope.

== SSH ==

=== Inside the university ===

To connect to Asterope or Merope simply use the command

<code>ssh cbi586j@asterope.agk.uni-due.de</code>

=== From outside of the university ===

To access the university network from outside, we need to establish a [[VPN]] connection using Forcepoint.
The command needed to connect is:

<code>sudo forcepoint-client vpn.uni-due.de --resolver /usr/bin/resolvectl</code>

Since the university does not allow direct forwarding to the group servers we need to take a detour over the staff server. This is done by the following command:

<code>ssh -4 <username>@staff.uni-due.de</code>

followed by

<code>ssh -p 54321 localhost</code>

to connect to Asterope.

The <code>-4</code> specifies to use IPv4 for the connection and the <code>-p</code> tells ssh to use a specific port for the connection.

To get a direct pipeline you can use

<code>ssh -p 54321 -J <username>@staff.uni-due.de <username>@localhost</code>

== SCP ==

SCP from inside the university network is very straightforward. The needed command is

<code>scp -r <username>@asterope.agk.uni-due.de:asterope-home/some/folder/somewhere/somedata.data</code>

To transfer data from Asterope to your local machine while using the VPN, I use a two-step system where I first transfer the data into a clipboard folder on the staff server and afterwards onto my local machine. The needed commands for this version are:

<code>scp -r -P 54321 <username>@localhost:/homes/<username>/asterope-home/some/folder/somewhere/somedata.data clipboard/</code>

<code>scp -r -4 <username>@staff.uni-due.de:clipboard/somedata.data /home/some/path/to/somewhere/</code>

The <code>-r</code> is needed to copy folders and not just single files, the <code>-P</code> to specify a port to which to connect to. Note that for scp, in contrast to ssh, this p has to be uppercase.
The direct forwarding from above works here as well, just replace the <code>-p</code> flag by <code>-P</code>.