[libvirt-users] libvirt/dnsmasq is not adhering to static DHCP assignments

[Dagmawi Biru]

Hi,

It looks like that's the issue:
# cat /var/lib/libvirt/dnsmasq/osc_mgmt.hostsfile
52:54:00:2c:85:92,192.168.80.1,openstack-controller-00

But it makes me wonder...libvirt should be generating and managing this
file right? Do I need to edit this myself or should libvirt be updating
this file? If so then why isn't it?



On Mon, Oct 30, 2017 at 5:21 AM, Yalan Zhang <yalzhang at redhat.com> wrote:

> 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 at dbvoid.com> 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 at 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 at 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 at 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?
>>
>>
>>
>>
>> _______________________________________________
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>> libvirt-users at redhat.com
>> https://www.redhat.com/mailman/listinfo/libvirt-users
>>
>
>
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