Code repository for final project for 601.619 Cloud Computing

To use this, first clone this directory into a mininet VM image at the root

In order to run this network, you need to have pox installed in the root directory. Additionally, you need to make this repository visible to pox. In the file ~/pox/pox/boot.py add the lines import sys sys.path.append("/root/Cloud619") at the top of the file. If you are running this from our server, this has already been done. If you would like the key to the server please email andrewking@jhu.edu. Once you have the key you can ssh into the server by typing the following command into the terminal:

ssh -i /path_to_key/TestServerkey.pem ubuntu@18.232.170.234

Next, type

sudo su -
cd Cloud619

To run a controller with ecmp load balancing, run the following command from the Cloud619 directory in a separate window:

sudo sh start_ecmp.sh

To run a controller with wcmp load balancing, run this command:

sudo sh start_wcmp.sh

You must start the controller before building the network.

In order to create a fat tree topology, run the following command:

sudo sh create_network.sh

At this point, you can use the mininet command line to play with the network.

To run our test suite on the ecmp based network, first start an ecmp controller using the steps above (remember, separate window) then run

sudo sh run_ecmp_tests.sh

To run the same tests on a wcmp network, start a wcmp controller and run

sudo sh run_wcmp_tests.sh

Each test takes about 20 minutes to run. Note that if you end the tests early you will have to manually clean up the network (see debugging section).

If you try to start a controller and you get an error saying that there is already something listening at port 6633, run the script

sudo sh find_listener.sh

Which will print a description of the zombie process. Locate the process id and type

kill <pid>

Where <pid> is replaced with the appropriate pid.

If mininet is giving an error that says certain switches already exists when you try to create a network, run

sudo mn clean -c

This will clean up any networks that other users forgot to delete.

Enjoy!

-Andrew, Alex, Matt

Fat tree, pox controller, and testing suite based on implementations from https://github.com/pranav93y/mininet-topology-simulation