Re: libvirt/dnsmasq is not adhering to static DHCP assignments

Yalan Zhang <yalzhang@xxxxxxxxxx> · Mon, 30 Oct 2017 18:21:25 +0800

Please check the dnsmasq hostsfile, should have all the records there:
# cat /var/lib/libvirt/dnsmasq/osc_mgmt.hostsfile
52:54:00:2c:85:92,192.168.80.1,openstack-controller-00
52:54:00:e2:4b:25,192.168.80.2,openstack-database-00
52:54:00:50:91:04,192.168.80.3,openstack-keystone-00
52:54:00:fe:5b:36,192.168.80.7,openstack-rabbitmq-00
52:54:00:95:ca:bd,192.168.80.5,openstack-glance-00

-------
Best Regards,
Yalan Zhang
IRC: yalzhang
Internal phone: 8389413

On Mon, Oct 30, 2017 at 8:26 AM, Dagmawi Biru <admin@xxxxxxxxxx> wrote:
Given the following network configuration:
===========
<network>
  <name>osc_mgmt</name>
  <uuid>d93fe709-14ae-4a0e-8989-aeaa8c76c513</uuid>
  <forward mode='route'/>
  <bridge name='osc_mgmt' stp='on' delay='0'/>
  <mac address='52:54:00:3f:fe:10'/>
  <ip address='192.168.80.254' netmask='255.255.255.0'>
    <dhcp>
      <range start='192.168.80.1' end='192.168.80.200'/>
      <host mac='52:54:00:2c:85:92' name='openstack-controller-00' ip='192.168.80.1'/>
      <host mac='52:54:00:e2:4b:25' name='openstack-database-00' ip='192.168.80.2'/>
      <host mac='52:54:00:50:91:04' name='openstack-keystone-00' ip='192.168.80.3'/>
      <host mac='52:54:00:fe:5b:36' name='openstack-rabbitmq-00' ip='192.168.80.7'/>
      <host mac='52:54:00:95:ca:bd' name='openstack-glance-00' ip='192.168.80.5'/>
    </dhcp>
  </ip>
</network>

When attempting to bring up the relevant interface in the virtual machine, I get an incorrect IP address assigned, different from the one I statically set up per the XML above. As you can see, the device with MAC '52:54:00:e2:4b:25' should really be getting 192.168.80.2, but what happens when we bring this interface up is this:

===========
root@openstack-database-00:/home/osc# ifup ens11
Internet Systems Consortium DHCP Client 4.3.3
Copyright 2004-2015 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

Listening on LPF/ens11/...
Sending on   LPF/ens11/...
Sending on   Socket/fallback
DHCPDISCOVER on ens11 to 255.255.255.255 port 67 interval 3 (xid=0x6769e42a)
DHCPREQUEST of 192.168.80.27 on ens11 to 255.255.255.255 port 67 (xid=0x2ae46967)
DHCPOFFER of 192.168.80.27 from 192.168.80.254
DHCPACK of 192.168.80.27 from 192.168.80.254
bound to 192.168.80.27 -- renewal in 1407 seconds.

Some additional info about the VM and network it's attached to
===========

[root@dragon dnsmasq]# virsh domiflist openstack-database-00
Interface  Type       Source     Model       MAC
-------------------------------------------------------
vnet12     bridge     br20       virtio      52:54:00:6c:ce:b9
vnet13     network    VM_MGMT    rtl8139     52:54:00:7d:ca:87
vnet14     network    osc_mgmt   rtl8139     52:54:00:e2:4b:25

[root@dragon dnsmasq]# virsh net-info osc_mgmt
Name:           osc_mgmt
UUID:           d93fe709-14ae-4a0e-8989-aeaa8c76c513
Active:         yes
Persistent:     yes
Autostart:      yes
Bridge:         osc_mgmt
===========

What's strange is that the first VM seems to work correctly and gets an assigned address of 192.168.80.1, but for some reason the others don't. Any ideas?

_______________________________________________

libvirt-users mailing list

libvirt-users@xxxxxxxxxx

https://www.redhat.com/mailman/listinfo/libvirt-users

_______________________________________________
libvirt-users mailing list
libvirt-users@xxxxxxxxxx
https://www.redhat.com/mailman/listinfo/libvirt-users