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Re: Quantum DHCP support.

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On 09/04/2012 12:48 PM, Takaaki Suzuki wrote:

Hi Gary

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


Can you also please provide sudo ovs-vsctl show?

Thanks
Gary



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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