1.7.0ΒΆ

We are making a few potentially breaking features in faucet 1.7.0. This document covers how to navigate the changes and safely upgrade from earlier versions to 1.7.0.

  1. Configuration and log directory changed

    Starting in 1.7.0 and onwards faucet has changed which directories it uses for configuration and log files. The new paths are:

    Old path New path
    /etc/ryu/faucet /etc/faucet
    /var/log/ryu/faucet /var/log/faucet

    Faucet 1.7.0 when being installed by pip will automatically attempt to migrate your old configuration files to /etc/faucet assuming it has permissions to do so. Failing this faucet when started will fallback to loading configuration from /etc/ryu/faucet. The search paths for configuration files are documented on the Environment variables page.

    Note

    Consider the /etc/ryu/faucet directory deprecated, we will in a future release stop reading config files stored in this directory.

    If you currently set your own configuration or log directory by setting the appropriate environment variables you will be unaffected. In most other cases the migration code or the fallback configuration search path will allow the upgrade to 1.7.0 to be seamless. We have however identified two cases where manual intervention is required:

    Dockers

    Dockers will need to be started with new mount directories, the commands to start a 1.7.0 docker version of faucet or gauge are detailed in the Docker section.

    Virtualenvs

    We are unable to migrate configuration files automatically when faucet is run inside of a virtualenv, please copy the configuration directory over manually.

  2. Changing default flood mode

    Currently faucet defaults to using combinatorial_port_flood when it comes to provisioning flooding flows on a datapath, faucet implicitly configures a datapath like this today:

    dps:
    mydp:
        combinatorial_port_flood: True

    The default is True, in 1.7.0 and previously. The default will change to False in 1.7.1.

    When True, flood rules are explicitly generated for each input port, to accommodate early switch implementations which (differing from the OpenFlow standard - see below) did not discard packets output to the packet input port. False generates rules per faucet VLAN which results in fewer rules and better scalability.

    See OpenFlow 1.3.5 specification, section B.6.3:

    The behavior of sending out the incoming port was not clearly defined
in earlier versions of the specification. It is now forbidden unless
the output port is explicitly set to OFPP_IN_PORT virtual port
(0xfff8) is set.