Testing

Software switch testing with docker

First, get yourself setup with docker based on our Docker documentation.

Then you can build and run the mininet tests from the docker entry-point:

docker build -t faucet/tests -f Dockerfile.tests .
apparmor_parser -R /etc/apparmor.d/usr.sbin.tcpdump
modprobe openvswitch
sudo docker run --privileged -ti faucet/tests

The apparmor command is currently required on Ubuntu hosts to allow the use of tcpdump inside the container.

Hardware switch testing with docker

                     +--------------------------+
                     |                          |
                     |         FAUCET CPN       |
                     |                          |
                     |                          |
+------------------------------+     +-------------------------+
|                    |         |     |          |              |
|                    |    +--+ |     | +--+     |              |
|                    |    |  +---------+  |     |              |
|   FAUCET test host |    +--+ |     | +--+     |              |
|                    +--------------------------+              |
|                              |     |                         |
|                              |     |                         |
|                              |     |                         |
|                              |     |                         |
|          +---------------------+   |                         |
|          |   +------+   +--+ | |   | +--+                    |
|          |   |VM 1  |   |  +---------+  |                    |
|          |   +------+   +--+ | |   | +--+                    |
|          |                   | |   |                         |
|          |   +------+   +--+ | |   | +--+  OpenFlow switch   |
|          |   |VM 2  |   |  +---------+  |  under test        |
|          |   +------+   +--+ | |   | +--+                    |
|          |                   | |   |                         |
|          |   +------+   +--+ | |   | +--+                    |
|          |   |VM 3  |   |  +---------+  |                    |
|          |   +------+   +--+ | |   | +--+                    |
|          |                   | |   |                         |
|          |   +------+   +--+ | |   | +--+                    |
|          |   |VM 4  |   |  +---------+  |                    |
|          |   +------+   +--+ | |   | +--+                    |
|          |                   | |   |                         |
|          |                   | |   |                         |
+------------------------------+ |   +-------------------------+
           |                     |
           |    MININET          |
           |                     |
           |                     |
           +---------------------+

Requirements

Your test host, requires at least 5 interfaces. 4 interfaces to connect to the dataplane, and one for the CPN for OpenFlow. You will need to assign an IP address to the CPN interface on the host, and configure the switch with a CPN IP address and establish that they can reach each other (eg via ping).

You will need to configure the switch with two OpenFlow controllers, both with the host’s CPN IP address, but with different ports (defaults are given below for of_port and gauge_of_port).

It is assumed that you execute all following commands from your FAUCET source code directory (eg one you have git cloned).

Test configuration

Create a directory for the test configuration:

mkdir -p /etc/ryu/faucet
$EDITOR /etc/ryu/faucet/hw_switch_config.yaml

hw_switch_config.yaml should contain the correct configuration for your switch:

hw_switch: True
hardware: 'Open vSwitch'
# Map ports on the hardware switch, to physical ports on this machine.
# If using a switch with less than 4 dataplane ports available, run
# FaucetZodiac tests only. A 4th port must still be defined here and
# must exist, but will not be used.
dp_ports:
  1: enp1s0f0
  2: enp1s0f1
  3: enp1s0f2
  4: enp1s0f3
# Hardware switch's DPID
dpid: 0xeccd6d9936ed
# Port on this machine that connects to hardware switch's CPN port.
# Hardware switch must use IP address of this port as controller IP.
cpn_intf: enp5s0
# There must be two controllers configured on the hardware switch,
# with same IP (see cpn_intf), but different ports - one for FAUCET,
# one for Gauge.
of_port: 6636
gauge_of_port: 6637
# If you wish to test OF over TLS to the hardware switch,
# set the following parameters per Ryu documentation.
# https://github.com/osrg/ryu/blob/master/doc/source/tls.rst
# ctl_privkey: ctl-privkey.pem
# ctl_cert: ctl-cert.pem
# ca_certs: /usr/local/var/lib/openvswitch/pki/switchca/cacert.pem

Running the tests

docker build -t faucet/tests -f Dockerfile.tests .
apparmor_parser -R /etc/apparmor.d/usr.sbin.tcpdump
modprobe openvswitch
sudo docker run --privileged --net=host \
    -v /etc/ryu/faucet:/etc/ryu/faucet \
    -v /tmp:/tmp \
    -ti faucet/tests

Running a single test

sudo docker run --privileged --net=host \
    -e FAUCET_TESTS="FaucetUntaggedTest" \
    -v /etc/ryu/faucet:/etc/ryu/faucet \
    -v /tmp:/tmp \
    -ti faucet/tests

Checking test results

If a test fails, you can look in /tmp - there will be subdirectories created for each test, which will contain all the logs and debug information (including tcpdumps).