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No particular reason except that is what libvirt uses by default and it is easy to modify.

Vish

On Feb 19, 2013, at 11:51 AM, Diego Parrilla Santamaría <diego.parrilla.santamaria at gmail.com> wrote:

> Thanks Vish,
> 
> This is something I always forget to ask: I'm curious about the historical reasons for dnsmasq instead of ISC-DHCP managed with OMAPI, for example.
> 
> Cheers
> Diego
> 
>  -- 
> Diego Parrilla
> CEO
> www.stackops.com |  diego.parrilla at stackops.com | +34 649 94 43 29 | skype:diegoparrilla
> 
> 
> 
> 
> 
> On Tue, Feb 19, 2013 at 8:37 PM, Vishvananda Ishaya <vishvananda at gmail.com> wrote:
> You cannot have an external dhcp server with openstack. Openstack needs a way to know the ip address assigned to a vm to do its listing properly. If you don't care about the api returning valid ips there is a possibility of using FlatNetworking (not FlatDHCP) to make nova stick the network into a bridge and not do any dhcp at all. You could then have an external server serving up dhcp ips. I suspect you will probably have to disable security groups completely using NoopFirewallDriver driver to get this to work.
> 
> As to the reason dhcp-host is not working, I suspect is because we give dnsmasq an external hosts file so you probably would need the host directive there.
> 
> Vish
> 
> On Feb 19, 2013, at 4:44 AM, Ritesh Nanda <riteshnanda09 at gmail.com> wrote:
> 
>> Hope Vish can answer this , what can be the way around to do this.
>> 
>> On Tue, Feb 19, 2013 at 2:01 PM, Razique Mahroua <razique.mahroua at gmail.com> wrote:
>> Hi,
>> I'm not sure the "dhcp-host" configuration option exists actually. As for having one another host in VLAN mode is something I'd be interested to know as well
>> 
>> Regards,
>> 
>> Razique Mahroua - Nuage & Co
>> razique.mahroua at gmail.com
>> Tel : +33 9 72 37 94 15
>> 
>> <NUAGECO-LOGO-Fblan_petit.jpg>
>> 
>> Le 19 févr. 2013 à 08:05, Ritesh Nanda <riteshnanda09 at gmail.com> a écrit :
>> 
>>> Hello ,
>>> 
>>> Is it possible to use external dhcp server , instead of dnsmasq .
>>> I am using openstack essex, with vlan manager as network,  I have a need where i need to implement dynamic dns, 
>>> so using dhcp3 as dhcp-server and bind9 as dns is possible.
>>> 
>>> Or is there any way in openstack i can implement dynamic dns in openstack.
>>> 
>>> One more problem which i am facing , dnsmasq has a option to assign static ip to a particular hostname using dhcp-host
>>> parameter in dnsmasq config file.
>>> 
>>> i tried it doing by defining  the config file of dnsmasq in nova.conf
>>> 
>>> --dnsmasq_config_file=/etc/nova/dnsmasq.conf
>>> 
>>> then in dnsmasq config file 
>>> 
>>> i gave options for a particular subnet.
>>>  
>>> 
>>> dhcp-range=Tenant-operator,10.0.50.3,10.0.50.254,255.255.255.0,24h
>>> dhcp-option=Tenant-operator,6,10.0.50.7
>>> domain=operator.com,10.0.50.0/24,local
>>> dhcp-host=importantmachine,10.0.50.120
>>> 
>>> these all options are working except dhcp-host.
>>> 
>>> Can anybody help me with this.
>>> -- 
>>>  With Regards  
>>>  Ritesh Nanda
>>> 
>>> 
>>> 
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>> 
>> 
>> 
>> -- 
>>  With Regards  
>>  Ritesh Nanda
>> 
>> 
>> 
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