Open Stack

I have found in openstack VxLAN MTU is 1450 and if i go and change
with following command on all server my application start working.

ip netns exec qrouter-2c23f26a-09a4-4a58-b7af-1ec0ee4078fa ifconfig
qr-12e51a7a-37 mtu 1500

so where and which option i should tune to make it permanent, i was
reading about it and found following two option but not sure which one
i should use to set only VxLAN MTU to 1500

path_mtu = 0
global_physnet_mtu = 1500

after changing this setting should i need to restart compute node or
just neutron service?



On Wed, Nov 9, 2016 at 4:33 PM, Rick Jones <rick.jones2 at hpe.com> wrote:
> On 11/09/2016 12:56 PM, Satish Patel wrote:
>>
>> If i enable Jumbo frames on openstack in that case do i need to change
>> or enable anything on my external/physical network infrastructure?
>
>
> Probably.
>
> In the most succinct terms, all nodes in the same "broadcast domain"
> (anywhere reachable via layer 2 - aka ethernet - and switching rather than
> layer 3 and routing) must have the same physical MTU.
>
> If you have end-nodes with JumboFrames enabled, the physical infrastructure
> joining them at layer2 must also have JumboFrames enabled.
>
> rick jones
>
>
>>
>> On Wed, Nov 9, 2016 at 3:13 PM, Mohammed Naser <mnaser at vexxhost.com>
>> wrote:
>>>
>>> Are you using any tunnelling or are you directly attaching to your
>>> physical network?
>>>
>>> If you're using tunnelling, I would recommend running jumbo frames on
>>> your compute and network nodes so they can transport packets with size of
>>> 1500. There is plenty of docs about this online that you can check.
>>>
>>> Sent from my iPhone
>>>
>>>> On Nov 9, 2016, at 11:06 AM, Satish Patel <satish.txt at gmail.com> wrote:
>>>>
>>>> We have 3 node cluster on Mikata openstack and we are using DVR
>>>> network. Recently we build two puppetmaster server on openstack and
>>>> put them behind Lbaasv2 load-balancer to share load but i found my
>>>> none of client able to talk to correctly with puppetmaster server on
>>>> openstack. After lots of research found openstack VM use mtu 1400 and
>>>> my rest of puppet agent server who are not on openstack they used mtu
>>>> 1500.
>>>>
>>>> as soon as i change puppet agent MTU size to 1400 everything started
>>>> working. But just surprised why openstack use 1400 for VM there must
>>>> be a reason like vxlan or GRE.
>>>>
>>>> So for experiment i change mtu 1500 on puppetmaster server on
>>>> openstack but it didn't help. How do i fix this issue?
>>>>
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>>
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>