15110 Fall 2011 [Cortina/von Ronne]
Remote Access Instructions
If you wish to work on your programming assignments from a physically
remote location, we recommend that you use ssh and X11 to run Ruby,
gedit, etc., on unix.andrew.cmu.edu.
Remote Access from a Windows PC Using XMing
In order to log in remotely and use programs that require graphics
or windows from the Andrew UNIX machines, you will need to download
a few applications.
- First, you will need an application so you can log in to the
Andrew UNIX machines remotely. We recommend
which is free. This is what Tom uses in class when he shows you
programming examples in irb. Download the putty.exe
file and put it somewhere on your computer where you can find it easily.
- You also have to download an application called Xming. This
application allows you to see X11 windows on your personal machine.
X11 is the windowing system used for UNIX/Linux machines. It's not the
same as Microsoft Windows, but it does have similar features that you're
used to with graphically based operating systems. You need to download the
following two files:
Each of these is a local copy on our own server which should work for
now. You can always check online for later versions, but finding these
tends to be hard to do. Install both of these using the default settings.
Be sure that both applications install to the same directory (they should
be default). Be sure to answer "yes" even if the directory exists.
In your Start Menu, you should now have an item for Xming. Start it now.
If you have a firewall, it may ask if you want to unblock it. You don't
need to. Once you've done this, look for the "X" icon in your system
tray (bottom right). If you hover over the icon, you should see something
like "Xming Server:0.0". Make a note of what you see if it's different.
- Now using PuTTY, you should set up a "session" so you can log in
easily. Start PuTTY.
For host name, use unix.andrew.cmu.edu and make sure
that SSH is selected as the Connection Type. In the Category menu
section on the left side, expand the SSH menu option and select
X11. Select the option Enable X11 Forwarding and for
X display location, enter localhost:0.0 unless you
didn't see 0.0 when you hovered over the "X" icon in the system
tray. If you saw some other x.y, then enter
localhost:x.y in that field, replacing x and y
with the numbers you saw. Now, click the Session option in the
main menu on the left, and underneath Saved Sessions enter a name for
this "session" (e.g. Andrew with X Windows). Click Save.
Now you can always Load these settings whenever you start PuTTY before
- Finally, in PuTTY, click Open to open the session you just set up.
You should see a terminal window open up and ask you for your login name.
Enter your Andrew ID and then when prompted, enter your password.
After this, you should see a prompt. You are now logged into
your home directory on the
Andrew UNIX machine cluster
remotely! To see that X windows applications run
and display on your local machine, try to run the xeyes
program by typing that command and hitting enter. You should see a pair
of eyes that follow your mouse pointer around. Close that application and
you should get your prompt back. You can run gedit and any other
applications now remotely.
If you want to hand in your files from your remote machine, you will
need to copy them from Andrew to your machine.
We recommend a program called
(for Windows Secure Copy). Install this. When you run it will ask for
a hostname (unix.andrew.cmu.edu as before), your user name
and password. When you click Login, it will connect with your Andrew
account. You can then drag files back and forth, change directories, etc.
So you can drag files from your Andrew account to your laptop, then zip
(or compress) them, and hand in from your own laptop.
Remote Access from a Mac
By default, Mac OS X should have all of the software you need to do
The basic idea is:
- run X11 on your Mac and start a local xterm attached to that X11
- use ssh to remotely connect to a CMU Andrew Linux Machine (unix.andrew.cmu.edu)
- cd to the directory you want
- start gedit by typing either
gedit & or
gedit filename.rb &
- start Interactive Ruby by typing
World article that covers steps (1)-(2). (After reading the section on
starting X11, ignore the "Where to Get X11 Programs" section and proceed
to "Running X11 Remotely".) In the ssh command just substitute your
andrew id for "username" and unix.andrew.cmu.edu for "hostname". (So if your
username is vonronne, for example, you would type the command
"ssh -X firstname.lastname@example.org" into the local xterm.)
See also, Piazza Question #29.