On 8/30/16, 4:44 PM, "Satish Patel" <satish....@gmail.com> wrote:
> Robert, > > I didn't find any related configuration which blacklist mac address on > Mitaka. also i didn't find any document stated that DHCP agent only > gives ip address to instance mac address. I am not sure if there is any specific doc about this on the OpenStack pages. However, neutron starts a dnsmasq process so you can have a look with ps on how that is running and configured. I am no dnsmasq expert but I looking at the dnsmasq man page: “The optional <mode> keyword may be static which tells dnsmasq to enable DHCP for the network specified, but not to dynamically allocate IP addresses: only hosts which have static addresses given via dhcp-host or from /etc/ethers will be served” When you look at the dnsmasq process on a neutron server it is indeed set to static and uses the –dhcp-host options: dnsmasq --dhcp-range=set:tag0,1.1.1.0,static,5529600s --dhcp-hostsfile=/var/lib/neutron/dhcp/123-4567/host --lots_of_other_options Disclaimer: Last time I had this scenario it was 2 years ago so my memory could be deceiving me but this was also the behavior I experienced. (Not 100% sure but I think we did have a custom build dnsmasq because the centos 6 version did not support all the required options or something. Since it was at a previous job I can no longer check but I am pretty sure it worked with 2 dhcp servers in the same range. Although it also depends a bit on which DHCP responds quicker on what behavior you will see exactly. In theory our “LAN” dhcp just could have been consistently quicker) Cheers, Robert van Leeuwen _______________________________________________ Mailing list: http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack Post to : openstack@lists.openstack.org Unsubscribe : http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack
