LoginServices < IT

---+ Login Services

---++ ppelx.physics.gla.ac.uk
Access to PPE machines from outside the PPE network is via =ppelx.physics.gla.ac.uk= using your ppe linux account. Currently access to =ppelx.physics.gla.ac.uk= from outside is granted by request only, contact the [[ITManagement]]  if you wish to use =ppelx.physics.gla.ac.uk= from outside.

An ssh client is then required to access =ppelx.physics.gla.ac.uk= (e.g PuTTY for Windows; and the ssh command on linux etc. desktops). PuTTY does not need to be administratively installed in Windows: you could write a copy onto a USB stick or a floppy disk, and take it with you in case the distant machine does not have it already.

---+++ Other PPE Machines
After logging into =ppelx.physics.gla.ac.uk= or =login.physics.gla.ac.uk= ppe users can then ssh into any ppe desktop machine.

---+++ SL4 Machines
A group of machines running Scientific Linux 4 is also availble: 

   * =ppelx64sl4.physics.gla.ac.uk= for 64 bit SL4
   * =ppelx32sl4.physics.gla.ac.uk= for 32 bit SL4

---++ login.physics.gla.ac.uk
The deptartmental login server =login.physics.gla.ac.uk= is also vailable from outside using your departmental linux account (i.e. your email username and password). Currently access to =login.physics.gla.ac.uk= for is granted by request only, contact [[ITManagement#FacultyIT][Faculty IT]]  if you wish to use =login.physics.gla.ac.uk=.

For forwarding X windows through =login.physics.gla.ac.uk= see [[ExtXWindows]].

---+++ Avoiding the copying double hop using login.physics.gla.ac.uk
*As =ppelx.physics.gla.ac.uk= can now be accessed directly the information below on doing a direct file copy is now redundant. The orginal script and instructions are below incase they can help in other double hop situations.*

As the ppe linux machines are not directly accessible  from outside copying files to the ppe systems from outside would seem to require first copying a file to =login.physics.gla.ac.uk= then logging into =login.physics.gla.ac.uk=  to copy the file to the ppe systems. From a linux system this _double hop_ can be avoided using by using a wrapper script to scp and some ssh configuration options.

First download the wrapper script: %ATTACHURL%/rscp, and ensure the script is executable my doing =chmod +x rscp= after down load. Then add into your =~/.ssh/config= file (on the remote none ppe system):

<verbatim>
Host login.physics.gla.ac.uk
     HostName login.physics.gla.ac.uk
     LocalForward 20001 ppelx:22
</verbatim>

If you do not have a =~/.ssh/config= create it with the above text and then ensure the correct files permissions by doing <code>chmod 0600 ~/.ssh/config</code>.

To use the script first ssh into =login.physics.gla.ac.uk= then in another window on the remote machine to (for example) copy files called f1 and f2 to your home directory on ppelx do, =rscp file1 file2 ppelx:~/= on the remote machine or to recursively copy a directory called dir1to your home directory on ppelx use =rscp -r dir1 ppelx:~/=.

-- Main.AndrewPickford - 16 Sept 2010
Attachments
Topic attachments
I	Attachment	History	Action	Size	Date	Who	Comment
ext	rscp	r1	manage	4.1 K	2008-12-03 - 15:59	AndrewPickford	scp wrapper script
This topic: IT > WebHome > LoginServices
Topic revision: r7 - 2016-04-14 - GordonStewart