<p dir="ltr">Yup, this is expected. It happens for both single-host and multi-host. With the former, we have an older environment where it takes around 10 minutes for all network access to resume. That's with a few hundred tenants, a few hundred vlans, and a few hundred floating IPs all on one host, though. </p>
<p dir="ltr">From your list of reasons for restarting, we only need to restart nova-network for config changes. If you're running into odd issues that you think nova-network might be causing, definitely feel free to describe some symptoms :)</p>
<p dir="ltr">Joe</p>
<div class="gmail_quote">On Nov 26, 2015 8:49 AM, "Gustavo Randich" <<a href="mailto:gustavo.randich@gmail.com">gustavo.randich@gmail.com</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>Hi everybody, (still using nova-network in production... :)</div><div><br></div><div>Using nova-network (icehouse), multi-host, FlatDHCPManager<br></div><div><br></div><div>Is it expectable to experience an interruption of various seconds in instances' floating IP reachability when nova-network is restarted and repopulates iptables' NAT output/prerouting/float-snat tables? (IP packets are not delivered to VMs until iptables forwarding rules are setup)<br></div><div><br></div><div>We don't restart nova-network often, but we have certain cases when we need(ed) to:<br></div><div><br></div><div> * nova-network not reconnecting to RabbitMQ (latest oslo messaging patch mitigates this)</div><div> * configuration changes in nova.conf from time to time</div><div> * sanitary periodic (weekly or monthly) restarts to prevent poorly understood problems of the past (resource leaks?); will stop doing this due to NAT downtime<br></div><div><br></div><div>Thanks!<br></div><div><br></div></div>
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