VXLAN kernel requirement check for openvswitch agent is not working

[Gabriele Cerami]

on RHEL7 beta agent set to use VXLAN tunneling does not start.
I'm using rdo packages, if you want I can check the upstream version somewhere, but seems that code that checks the version is still in github.

in openvswitch-agent.log I see:

2014-05-21 13:53:21.762 1814 ERROR neutron.plugins.openvswitch.agent.ovs_neutron_agent [req-ce4eadcb-4cbb-4c09-a404-98ecb5383fa5 None] Agent terminated
2014-05-21 13:53:21.762 1814 TRACE neutron.plugins.openvswitch.agent.ovs_neutron_agent Traceback (most recent call last):
2014-05-21 13:53:21.762 1814 TRACE neutron.plugins.openvswitch.agent.ovs_neutron_agent File "/usr/lib/python2.7/site-packages/neutron/plugins/openvswitch/agent/ovs_neutron_agent.py", line 231, in _check_ovs_version
2014-05-21 13:53:21.762 1814 TRACE neutron.plugins.openvswitch.agent.ovs_neutron_agent ovs_lib.check_ovs_vxlan_version(self.root_helper)
2014-05-21 13:53:21.762 1814 TRACE neutron.plugins.openvswitch.agent.ovs_neutron_agent File "/usr/lib/python2.7/site-packages/neutron/agent/linux/ovs_lib.py", line 551, in check_ovs_vxlan_version
2014-05-21 13:53:21.762 1814 TRACE neutron.plugins.openvswitch.agent.ovs_neutron_agent 'kernel', 'VXLAN')
2014-05-21 13:53:21.762 1814 TRACE neutron.plugins.openvswitch.agent.ovs_neutron_agent File "/usr/lib/python2.7/site-packages/neutron/agent/linux/ovs_lib.py", line 529, in _compare_installed_and_required_version
2014-05-21 13:53:21.762 1814 TRACE neutron.plugins.openvswitch.agent.ovs_neutron_agent raise SystemError(msg)
2014-05-21 13:53:21.762 1814 TRACE neutron.plugins.openvswitch.agent.ovs_neutron_agent SystemError: Unable to determine kernel version for Open vSwitch with VXLAN support. To use VXLAN tunnels with OVS, please ensure that the version is 1.10 or newer!
2014-05-21 13:53:21.762 1814 TRACE neutron.plugins.openvswitch.agent.ovs_neutron_agent

It seems that the minimum kernel version required to use VXLAN is set to 3.13 (shouldn't 3.9 be enough ?). RHEL7 ships only 3.10. Vxlan module however is present and working, and even if the only module properly working is in 3.13 kernel, the check doesn't take into consideration backported features.

[Benedikt Trefzer (benedikt-trefzer)]

I have the same issue on Debian wheezy whith the backport Kernel.

Can you please attach the output of
uname -r
and
modinfo openvswitch

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/95588

[Benedikt Trefzer (benedikt-trefzer)]

Thanks Gabriel for the log.
I think the issue whith Kernel Debian wheezy and backport Kernel is a different one, which seems already be addressed with
Change-Id: I57e18c0b95904f318e3fff08cd18b32e28f48834 in master branch.
(Hint: Debian Backport Kernel uname -r gives 3.14-0.bpo.1-amd64 which does not match the pattern used in icehouse).

The problem you have, is that the pattern used for "modinfo openvswitch" matches on two lines. See fix proposed.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/icehouse
Review: https://review.openstack.org/95592

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/95588
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=be340d1bab015c47650687f97393c6c9015fb537
Submitter: Jenkins
Branch: master

commit be340d1bab015c47650687f97393c6c9015fb537
Author: Benedikt Trefzer <email address hidden>
Date: Mon May 26 22:45:25 2014 +0200

    fix openvswitch requirement check

    With VXLAN enabled on openvswitch, neutron checks
    module version of the openvswitch kernel module.
    If the pattern to extract the version matches twice
    (eg. for path and version) the agent dies.

    This patch ensures, that only the version is checked
    against the pattern.

    Change-Id: I879624f6b0936cab59e02958ae3a89950df773bb
    Closes-Bug: #1322139

[chadh (baryonicdm)]

i'm on openstack icehouse on centos 6.5 and struggling with the same bug.

ovs agent keeps saying that

"SystemError: Unable to determine kernel version for Open vSwitch with VXLAN support. To use VXLAN tunnels with OVS, please ensure that the version is 1.10 or newer!"

my modinfo is like below
# modinfo openvswitch
filename: /lib/modules/2.6.32-431.17.1.el6.x86_64/kernel/net/openvswitch/openvswitch.ko
license: GPL
description: Open vSwitch switching datapath
srcversion: 993363C44DF474BD67B03CC
depends: vxlan
vermagic: 2.6.32-431.17.1.el6.x86_64 SMP mod_unload modversions

# uname -ra
Linux network 2.6.32-431.17.1.el6.x86_64 #1 SMP Wed May 7 23:32:49 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/icehouse
Review: https://review.openstack.org/98615

[Terry Wilson (otherwiseguy)]

This is already fixed in master by: https://review.openstack.org/#/c/96525/. We should fix it the same way in icehouse.

[OpenStack Infra (hudson-openstack)]

Change abandoned by mark mcclain (<email address hidden>) on branch: stable/icehouse
Review: https://review.openstack.org/98615
Reason: Abandoning this change since it is not a candidate for back porting.