Open Stack

Well, what value do you have for send_arp_for_ha_count ?
On 13 Mar 2015 17:11, "Georgios Dimitrakakis" <giorgis at acmac.uoc.gr> wrote:

> So according to that it sends ARP every time a floating IP is assigned at
> a VM. Am I right?
>
> If that is correct unfortunately it's not working :-(
>
> Any ideas how to debug it?
>
> Thanks a lot for your help!
>
> Regards,
>
> George
>
>
>  Based on the code, it sends the gratuitous ARPs only when the floating
>> IP is assigned to the VM, and its sent as many times as the user
>> decided by configuring the "send_arp_for_ha_count" parameter in
>> nova.conf
>>
>> So, to be safe, I would add the following in nova.conf and restart
>> nova services.
>>
>> send_arp_for_ha=true
>> send_arp_for_ha_count=20
>>
>> On Fri, Mar 13, 2015 at 2:54 PM, Georgios Dimitrakakis  wrote:
>>
>>  George,
>>>
>>> how often does it send the gratuitous ARP requests?
>>>
>>> Does it send it every time a network change is happening?
>>>
>>> Best,
>>>
>>> George
>>>
>>>  You have to set two variables in the nova.conf file apparently
>>>> ("send_arp_for_ha" and "send_arp_for_ha_count"):
>>>>
>>>>
>>>>
>>>
>> https://github.com/openstack/nova/blob/3658e1015a2f7cb7c321cc1a0adfda
>> 37757fd80b/nova/network/linux_net.py#L764
>>
>>> [4]
>>>> [4]
>>>>
>>>> On Fri, Mar 13, 2015 at 2:00 PM, Georgios Dimitrakakis  wrote:
>>>>
>>>>  On 03/13/2015 05:54 AM, Georgios Dimitrakakis wrote:
>>>>>>
>>>>>>  On 03/12/2015 06:24 PM, Georgios Dimitrakakis wrote:
>>>>>>>>
>>>>>>>>  Hello!
>>>>>>>>>
>>>>>>>>> I am facing a rather weird issue and would like to know
>>>>>>>>> if
>>>>>>>>> anyone has
>>>>>>>>> faced it before and the way you have solved it (if
>>>>>>>>> any).
>>>>>>>>>
>>>>>>>>> Firstly, I d like to let you know that I am running
>>>>>>>>> Icehouse with Nova-Legacy
>>>>>>>>> Networking.
>>>>>>>>>
>>>>>>>>> I have an application that launches and terminates VMs
>>>>>>>>> very
>>>>>>>>> frequently and
>>>>>>>>> automatically assigns to them
>>>>>>>>> floating IP addresses.
>>>>>>>>>
>>>>>>>>> As a result if an IP has been used once then the second
>>>>>>>>> time that is being used
>>>>>>>>> cannot be reached for at
>>>>>>>>> least 20minutes (this is the time frame if the newly
>>>>>>>>> launched VM gets the same
>>>>>>>>> IP address from one that
>>>>>>>>> has just been terminated). Furthermore, this issue only
>>>>>>>>> happens when the second
>>>>>>>>> VM is launched on a
>>>>>>>>> different physical node (hypervisor) than the first
>>>>>>>>> one.
>>>>>>>>>
>>>>>>>>> I believe that I have identified the problem to be ARP
>>>>>>>>> Caching on the router
>>>>>>>>> side since if I do:
>>>>>>>>>
>>>>>>>>> arping -U -I {Interface-Name} {IP-Address}
>>>>>>>>>
>>>>>>>>> in order to update the ARP Caches of the neighbors
>>>>>>>>> immediately the new VM can be
>>>>>>>>> reached on its floating
>>>>>>>>> IP address.
>>>>>>>>>
>>>>>>>>> Is this the proper way of solving it?
>>>>>>>>>
>>>>>>>>> Can I somehow "instruct" OpenStack not to use the first
>>>>>>>>> available IP address
>>>>>>>>> everytime but on a random order
>>>>>>>>> or the one that hasnt been used for enough time?
>>>>>>>>>
>>>>>>>>> Any other thoughts?
>>>>>>>>>
>>>>>>>>
>>>>>>>> Just a thought, have you tried enabling "send_arp_for_ha"
>>>>>>>> in
>>>>>>>> nova.conf?
>>>>>>>>
>>>>>>>> Chris
>>>>>>>>
>>>>>>>
>>>>>>> Hi Chris! Thx for the feedback!
>>>>>>>
>>>>>>> send_arp_for_ha = True
>>>>>>>
>>>>>>> is already enabled in all nodes (controller and compute).
>>>>>>>
>>>>>>> Can I somehow verify that its working?
>>>>>>>
>>>>>>
>>>>>> You should be able to verify with a packet sniffer somewhere
>>>>>> on
>>>>>> your network.
>>>>>>
>>>>>>  How often is it sending the ARP request? Does it send it
>>>>>>> every
>>>>>>> time nova configuration is changing?
>>>>>>>
>>>>>>
>>>>>> Im very much *not* an expert in this area, so Im afraid Im
>>>>>> not
>>>>>> the
>>>>>> right person to ask about that.
>>>>>>
>>>>>> Chris
>>>>>>
>>>>>
>>>>> Chris,
>>>>>
>>>>> thanks for the feedback. Any idea on what to sniff for?
>>>>>
>>>>> George
>>>>>
>>>>> _______________________________________________
>>>>> Mailing list:
>>>>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack
>>>>> [1] [1]
>>>>> Post to     : openstack at lists.openstack.org [2] [2]
>>>>> Unsubscribe :
>>>>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack
>>>>> [3] [3]
>>>>>
>>>>
>>>> Links:
>>>> ------
>>>> [1] http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack
>>>> [5]
>>>> [2] mailto:openstack at lists.openstack.org [6]
>>>> [3] http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack
>>>> [7]
>>>> [4]
>>>>
>>>>
>>>>
>>>
>> https://github.com/openstack/nova/blob/3658e1015a2f7cb7c321cc1a0adfda
>> 37757fd80b/nova/network/linux_net.py#L764
>>
>>> [8]
>>>> [5] mailto:giorgis at acmac.uoc.gr [9]
>>>>
>>>
>>> _______________________________________________
>>> Mailing list:
>>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack [10]
>>> Post to     : openstack at lists.openstack.org [11]
>>> Unsubscribe :
>>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack [12]
>>>
>>
>>
>>
>> Links:
>> ------
>> [1] http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack
>> [2] mailto:openstack at lists.openstack.org
>> [3] http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack
>> [4]
>>
>> https://github.com/openstack/nova/blob/3658e1015a2f7cb7c321cc1a0adfda
>> 37757fd80b/nova/network/linux_net.py#L764
>> [5] http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack
>> [6] mailto:openstack at lists.openstack.org
>> [7] http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack
>> [8]
>>
>> https://github.com/openstack/nova/blob/3658e1015a2f7cb7c321cc1a0adfda
>> 37757fd80b/nova/network/linux_net.py#L764
>> [9] mailto:giorgis at acmac.uoc.gr
>> [10] http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack
>> [11] mailto:openstack at lists.openstack.org
>> [12] http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack
>> [13] mailto:giorgis at acmac.uoc.gr
>>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstack.org/pipermail/openstack/attachments/20150313/6d20df36/attachment.html>