On Oct 12, 2012, at 10:33 AM, Justin Hurley <justin.hur...@opensgi.com> wrote:
> Hello All, > > I am having problems with some instances not receiving DCHPACK from my VM's > dhcp server after extended periods of time. These instances are running heavy > network, I/O, and RAM loads when the DHCPREQUEST does not receive a response. > Note that this only happens to a handful of instances, not all instances > running the exact same load. I have printed a relevant section of the syslog > below. > > My current environment is a multi-host flat dhcp network with nova-network > running on each node. All servers and VM's are running Ubuntu 12.04 and using > kvm/libvirt. I am also using large NFS servers to transfer big files to and > from instances across the VM network. > > In the past, I used Eucalyptus and the same problem would occur. This tends > to happen more frequently with more VMs and overall network load. > > If anyone has any ideas as to why the dhcp server stops responding to only a > few instances occasionally please let me know. I haven't seen this before, but you may be able to work around the issue by setting much longer leases: force_dhcp_release=True dhcp_lease_time=86400 # 1 day leases fixed_ip_disassociate_timout=172800 # 2 day timeout Vish
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