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[Takaaki Suzuki <suzuki@xxxxxxxxxxxx>]

Hi Gary

Thank you for your support.
I share with you information.

> 1. can you please do quantum port-list?
quantum --os_token f095d7163a564456b60bf47b078537a7 --os_url
http://localhost:9696/ port-list

- VM port
admin_state_up : True
device_id          : d6f9eb16-fb54-4c6c-8c1f-dd7859696910
device_owner    :
fixed_ips           :{"subnet_id":
"2c6e941e-cf21-40c9-8f1a-37db0e2e9a46", "ip_address": "192.168.30.3"}
id                     : 0118eb34-424f-460e-8e12-42ecffb2dad8
mac_address    : fa:16:3e:0d:e6:31
name                :
network_id        : 069f4cfc-3f97-4018-b08e-4a4868f3ca94
status               : ACTIVE
tenant_id           :cf67ba5e70e346b9a080fb349b5e1125

- DHCP agent port
admin_state_up : True
device_id          :
dhcp72aca792-f411-52a0-a641-defa1b398574-069f4cfc-3f97-4018-b08e-4a4868f3ca94
device_owner    : network:dhcp
fixed_ips           : {"subnet_id":
"bf07d0cd-7abb-4bf0-83a2-dfc1f3c21f8e", "ip_address": "192.168.10.2"},
{"subnet_id": "2c6e941e-cf21-40c9-8f1a-37db0e2e9a46", "ip_address":
"192.168.30.2"}
id                     : bd10a19b-a679-4b65-b36b-7beffcdae1ba
mac_address    : fa:16:3e:6c:f0:b5
name                : DHCP Agent
network_id        : 069f4cfc-3f97-4018-b08e-4a4868f3ca94
status               : ACTIVE
tenant_id           :cf67ba5e70e346b9a080fb349b5e1125


> 2. Is the DHCP agent running (q-dhcp in stackrc)?
Yes, DHCP agent running. I added "enable_service q-dhcp".

> 3. How did you launch the VM's? Did you use nova boot --nic net-id=quantum
> network ID?
I use Horizon for Quantum V2 (https://github.com/amotoki/horizon).

> 4. Can you please check that the host files has the MAC address and IP
> address of your VM - this is under /opt/stack/data/dhcp/<network id>/..
midokura16:/opt/stack/data/dhcp/069f4cfc-3f97-4018-b08e-4a4868f3ca94# cat host
fa:16:3e:0d:e6:31,192-168-30-3.openstacklocal,192.168.30.3
fa:16:3e:6c:f0:b5,192-168-10-2.openstacklocal,192.168.10.2
fa:16:3e:6c:f0:b5,192-168-30-2.openstacklocal,192.168.30.2

- dnsmasq syslog when launch VM.
dnsmasq-dhcp[12592]: DHCPDISCOVER(tapbd10a19b-a6) fa:16:3e:0d:e6:31 no
address available
dnsmasq-dhcp[12592]: last message repeated 2 times
dnsmasq-dhcp[12592]: DHCPDISCOVER(tapbd10a19b-a6) fa:16:3e:15:62:6a no
address available
dnsmasq-dhcp[12592]: last message repeated 2 times

- sudo ip netns exec 069f4cfc-3f97-4018-b08e-4a4868f3ca94 ip link
104: tapbd10a19b-a6: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu
1500 qdisc noqueue state UNKNOWN
    link/ether fa:16:3e:6c:f0:b5 brd ff:ff:ff:ff:ff:ff

- sudo ip netns exec 069f4cfc-3f97-4018-b08e-4a4868f3ca94 ip route
192.168.10.0/24 dev tapbd10a19b-a6  proto kernel  scope link  src 192.168.10.2
192.168.30.0/24 dev tapbd10a19b-a6  proto kernel  scope link  src 192.168.30.2

- quantum-dhcp agent spawn dnsmasq for test04 network
dnsmasq --no-hosts --no-resolv --strict-order --bind-interfaces
--interface=tapbd10a19b-a6 --except-interface=lo
--domain=openstacklocal
--pid-file=/opt/stack/data/dhcp/069f4cfc-3f97-4018-b08e-4a4868f3ca94/pid
--dhcp-hostsfile=/opt/stack/data/dhcp/069f4cfc-3f97-4018-b08e-4a4868f3ca94/host
--dhcp-optsfile=/opt/stack/data/dhcp/069f4cfc-3f97-4018-b08e-4a4868f3ca94/opts
--leasefile-ro --dhcp-range=set:tag0,192.168.10.0,static,120s

Hope that helped.
Thanks!

Suzuki

On Tue, Sep 4, 2012 at 6:13 PM, Gary Kotton <gkotton@xxxxxxxxxx> wrote:
> On 09/04/2012 12:03 PM, Takaaki Suzuki wrote:
>>
>> Hi
>>
>> Currently, I see that DHCP instance is created per network, at least
>> from looking at the Dnsmasq implementation.
>>
>> I'm curious to know how a DHCP instance can provide services to a VM
>> attached to a port on a network that has multiple subnets.
>>
>> It doesn't seem possible to me that a VM can get two IP addresses on
>> an interface from this DHCP server. Is this feature supported in
>> Quantum?
>>
>> I ran a quick test using Devstack + QuantumV2 + OVS plugin.  I created
>> one network called "test04", and two subnets for tor the network,
>> 192.168.10.0/24 and 192.168.30.0/24.
>
> When a Quantum port is allocated an IP address is selected from one of the
> subnets configured on the network (unless the user has requested more than
> one IP address). The DHCP agent will learn this IP address and update the
> hosts file.
>
> Can you please provide the following information:
> 1. can you please do quantum port-list?
> 2. Is the DHCP agent running (q-dhcp in stackrc)?
> 3. How did you launch the VM's? Did you use nova boot --nic net-id=quantum
> network ID?
> 4. Can you please check that the host files has the MAC address and IP
> address of your VM - this is under /opt/stack/data/dhcp/<network id>/..
>
> Thanks
> Gary
>>
>> With Dnsmasq running as the DHCP server, I launched a VM, and as
>> suspected, it did not receive any IP address.  I checked the Dnsmasq
>> log and it looked like it did receive DHCPDISCOVER message but it did
>> not offer anything back.
>>
>> I would love to know there is actually a way to get this to work, or
>> if I'm missing some critical steps here.
>>
>> Thanks!
>> Suzuki
>>
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>
>
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