openstack team mailing list archive

[Vishvananda Ishaya <vishvananda@xxxxxxxxx>]

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@xxxxxxxxx> 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@xxxxxxxxx> 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@xxxxxxxxx
> Tel : +33 9 72 37 94 15
> 
> <NUAGECO-LOGO-Fblan_petit.jpg>
> 
> Le 19 févr. 2013 à 08:05, Ritesh Nanda <riteshnanda09@xxxxxxxxx> 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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