.. _ml2ovn_trace:

ml2ovn-trace
============

This is a simple wrapper around ovn-trace that will fill in datapath, inport,
eth.src, ip.src, eth.dst, and ip.dst based on values pulled from openstack
objects.

Usage
-----
.. code-block:: console

  Usage: ml2ovn-trace [OPTIONS] [OVNTRACE_ARGS]...

  Options:
    -c, --cloud TEXT                Cloud from clouds.yaml to connect to
    -n, --net TEXT                  Network to limit interfaces lookups to
    --from-net TEXT                 Network to limit src interface lookups to
    --to-net TEXT                   Network to limit dst interface lookups to
    -f, --from [server|router]=value
                                    Fill eth-src/ip-src from the same object,
                                    e.g. server=vm1

    --eth-src [mac|server|router]=value
                                    Object from which to fill eth.src
                                    [required]

    --ip-src [ip|server|router]=value
                                    Object from which to fill ip.src  [required]
    -t, --to [server|router]=value  Fill eth-dst/ip-dst from the same object,
                                    e.g. server=vm2

    -v, --eth-dst, --via [mac|server|router]=value
                                    Object from which to fill eth.dst
                                    [required]

    --ip-dst [ip|server|router]=value
                                    Object from which to fill ip.dst  [required]
    -m, --microflow TEXT            Additional microflow text to append to the
                                    one generated

    -v, --verbose                   Enables verbose mode
    --dry-run                       Print ovn-trace output, but don't run it
    --help                          Show this message and exit.

Examples
--------
If vm1 and vm2 only have one network interface and you want to trace between them:

.. code-block:: console

  $ sudo ml2ovn-trace --from server=vm1 --to server=vm2

Or if you want to limit to a specific network:

.. code-block:: console

  $ sudo ml2ovn-trace --net net1 --from server=vm1 --to server=vm2

Or if you want to go from vm1 to the floating IP of vm2 via vm1's router:

.. code-block:: console

  $ sudo ml2ovn-trace --net net1 --from server=vm1 --to ip=172.18.1.7 --via router=net1-router

To add to the generated microflow, use -m. For example, for SSH:

.. code-block:: console

  $ sudo ml2ovn-trace --net net1 --from server=vm1 --to server=vm2 -m "tcp.dst==22"

To pass arbitrary (non microflow) arguments to ovn-trace, place them after '--':

.. code-block:: console

  $ sudo ml2ovn-trace --net net1 --from server=vm1 --to server=vm2 -- --summary