[openstack-dev] [nova][neutron][upgrade] Grenade multinode partial upgrade

Ihar Hrachyshka ihrachys at redhat.com
Mon Jan 11 10:39:53 UTC 2016

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

[1] https://bugs.launchpad.net/cirros/+bug/1301958

> 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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