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/3658e1015a2f7cb7c321cc1a0adfda37757fd80b/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
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