wiki:GENIExperimenter/Tutorials/NSDI13/IntroToOmni/Execute

Version 3 (modified by nriga@bbn.com, 7 years ago) (diff)

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5. Run your experiment

Now that resources are ready we can start running our experiment. We will first start by logging in to our reserved nodes.

5a. Logging Into the nodes -- Omni Scripting

Depending on the Aggregate the login information are either part of the sliverstatus call, or as part of the manifest rspec, i.e. returned from the listresources call. Omni comes with a script that makes it easy to gather all this information.

  1. In the terminal run:
    readyToLogin.py -a pg-utah <slicename>
    
    The script will return the actual command that you would need to use for logging in.
  2. Login to both nodes by copy-paste the commands from the output of the script.

5b. Send IP traffic

The first simple experiment that we will run is to verify the IP connectivity between our hosts.

  1. Check the interfaces of your nodes. In the terminal type:
     /sbin/ifconfig
    
    You should see at least two interfaces:
    • The control interface. This is the interface from where you access the node, e.g. ssh into your host. The control interface is mainly used for control traffic, i.e. traffic for controlling the node and the experiment. The control interface usually has a publicly routable IP.
    • The data interface. This is the interface that is used for sending experimental traffic. This is the interface that connects to the other hosts of your experiment through GENI. The links between these interfaces are the ones that allow you to run non-IP experiments.
  2. Note the name and the MAC address of the control and of the data interface for each node. The data interface is the one that has an IP that starts with 10.
  3. From the client ping the server. From the xterm that is logged in to the client type :
      ping server -c 5
    
    Note: You can use the name that is assigned to the host to directly ping the host, you can also ping using the IP of the data interface of the node. An example output should look like :
    [[inki@r2 ~]$ ping server -c 5
    PING 10.10.2.1 (10.10.2.1) 56(84) bytes of data.
    64 bytes from 10.10.2.1: icmp_seq=1 ttl=64 time=1.95 ms
    64 bytes from 10.10.2.1: icmp_seq=2 ttl=64 time=2.27 ms
    64 bytes from 10.10.2.1: icmp_seq=3 ttl=64 time=2.04 ms
    64 bytes from 10.10.2.1: icmp_seq=4 ttl=64 time=1.95 ms
    64 bytes from 10.10.2.1: icmp_seq=5 ttl=64 time=1.72 ms
    
    --- 10.10.2.1 ping statistics ---
    5 packets transmitted, 5 received, 0% packet loss, time 4005ms
    rtt min/avg/max/mdev = 1.728/1.992/2.278/0.179 ms
    

5c. Send non-IP traffic

GENI provides the capability of running non-IP experiments, since you can connect your hosts at Layer 2. For the purpose of this tutorial we have installed in all the hosts a very simple Layer 2 ping program that sends packets using a custom ethernet type.

  1. Disable the IP in your nodes. First of all we are going to completely disable IP on our nodes. In each of the terminals type:
    sudo /sbin/ifconfig <data i/f name> 0.0.0.0
    
    Note: Be extra careful to bring down the IP on the data interface, bringing down the IP on the control interface means that you will lose connectivity to your host.
  2. Try again to ping from the client to the server. In the xterm of the client type:
    ping server -c 5
    
    This time the ping should timeout.
  3. Start the Layer 2 ping server: In the server xterm, type:
    sudo /usr/local/bin/pingPlusListener 12345
    
  4. From the client try to ping the server at layer 2. You will need the mac address of the data interface of the server and the name of the data interface of the client. In the xterm of the client, type:
    sudo /usr/local/bin/pingPlus <server data mac addr> <client data i/f name> 12345
    

The result should look like :

[uncusr20@client ~]$ sudo /usr/local/bin/pingPlus 02:00:9B:48:3E:20 mv1.1 12345
RQ:'5582+2067' to 2:0:9b:48:3e:20.
RQ:5582+2067 from 2:0:3e:15:6c:ab.

Congratulations you have run a Layer 2 experiment in GENI!

6. Cleanup resources

Although all your reservations, have expiration times, you should always release your resources once you have completed your experiment to make them available to other experimenters.

  1. In the terminal, where you have been running your omni commands do:
    omni.py deletesliver -a  pg-utah <slicename>
    

7. Wrap up

Congratulations, you have finished the tutorial! Now you are ready to design and run your own experiments. Don't hesitate to email us with any questions you might have.

7a. Fill out the tutorial survey

We love to hear what you think so that we can improve the tutorials in the future. Please complete the online survey and get a temporary GENI tatoo!

7b. Get Your Own Account

The accounts, that you used in the above steps will be deactivated after the tutorial. If you do not already have an account at GPO's ProtoGENI cluster, you should can follow these instructions to get an account and start using GENI.