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Ihar Hrachyshka <ihrachys at redhat.com> wrote:

> Ihar Hrachyshka <ihrachys at redhat.com> wrote:
>
>> Sean M. Collins <sean at coreitpro.com> wrote:
>>
>>> Just a quick update where we are:
>>>
>>> Increasing the verbosity of the SSH session into the instance that is
>>> created during the cinder portion is showing that we are actually
>>> connecting to the instance successfully. We get the dropbear SSH banner,
>>> but then the instance hangs. Eventually SSH terminates the connection, 5
>>> minutes later.
>>>
>>> http://logs.openstack.org/35/187235/12/experimental/gate-grenade-dsvm-neutron-multinode/984e651/logs/grenade.sh.txt.gz#_2016-01-08_20_13_40_040
>>
>> As per [1], could be related to mtu on the interface. Do we configure  
>> MTU on external devices to accommodate for tunnelling headers?
>>
>> As per [2] neutron server logs, the network in question is vxlan.
>>
>> If that’s indeed the mtu issue, and since Cirros does not support DHCP  
>> MTU option documented for ml2 at [3], I don’t know how to validate  
>> whether it’s indeed the issue.
>
> UPD: ^ that’s actually not true, cirros supports the option since 0.3.3  
> [1] (and we use 0.3.4 [2]), so let’s try to enforce it inside neutron and  
> see whether it helps: https://review.openstack.org/265759

UPD: seems like enforcing instance mtu to 1400 indeed makes us pass forward  
into tempest:

http://logs.openstack.org/59/265759/3/experimental/gate-grenade-dsvm-neutron-multinode/a167a59/console.html

And there are only three failures there:

http://logs.openstack.org/59/265759/3/experimental/gate-grenade-dsvm-neutron-multinode/a167a59/console.html#_2016-01-11_11_58_47_945

I also don’t see any RPC versioning related traces in service logs, which  
is a good sign.


>
> [1] https://bugs.launchpad.net/cirros/+bug/1301958
> [2]  
> http://logs.openstack.org/35/187235/11/experimental/gate-grenade-dsvm-neutron-multinode/a5af283/logs/grenade.sh.txt.gz#_2015-11-30_18_57_46_067
>
>
>
>> Also, what’s the underlying infrastructure that is available in gate?  
>> Does it allow vlan for tenant networks? (We could enforce vlan for the  
>> network and see whether it fixes the issue.)
>>
>> [1] https://bugs.launchpad.net/ubuntu/+source/openssh/+bug/1254085
>> [2]  
>> http://logs.openstack.org/35/187235/11/experimental/gate-grenade-dsvm-neutron-multinode/a5af283/logs/old/screen-q-svc.txt.gz#_2015-11-30_19_28_44_685
>> [3]  
>> https://access.redhat.com/documentation/en/red-hat-enterprise-linux-openstack-platform/7/networking-guide/chapter-16-configure-mtu-settings
>>
>> Ihar
>>
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