[one-users] FlatDHCP networking problem

[Javier Alvarez]

Hello all,

Here it is my situation:

I am trying to install Essex on a small cluster (3 nodes) running 
Debian. There is a front-end node that has a public IP and then there 
are 2 compute nodes in a LAN. I cannot run nova-network on the front-end 
node because it is overwritting the iptables there and some other 
services start to misbehave, so I am trying a multi-host solution with 
nova-network running in each compute node.

The nova.conf I'm using in both compute nodes is the following:

[DEFAULT]
logdir=/var/log/nova
state_path=/var/lib/nova
lock_path=/var/lock/nova
root_helper=sudo nova-rootwrap
auth_strategy=keystone
iscsi_helper=tgtadm
sql_connection=mysql://nova-common:password@172.16.8.1/nova
connection_type=libvirt
libvirt_type=kvm
my_ip=172.16.8.22
rabbit_host=172.16.8.1
glance_host=172.16.8.1
image_service=nova.image.glance.GlanceImageService
network_manager=nova.network.manager.FlatDHCPManager
fixed_range=192.168.100.0/24
flat_interface=eth1
public_interface=eth0
flat_network_bridge=br100
flat_network_dhcp_start=192.168.100.2
network_size=256
dhcpbridge_flagfile=/etc/nova/nova.conf
dhcpbridge=/usr/bin/nova-dhcpbridge
multi_host=True
send_arp_for_ha=true

I have created a network with:

nova-manage network create private --fixed_range_v4=192.168.100.0/24 
--multi_host=T --bridge_interface=br100

And I have set up eth1 with no IP and running in promisc mode. When I 
launch an instance, ifconfig outputs the following:


br100     Link encap:Ethernet  HWaddr 68:b5:99:c2:7b:a7
           inet addr:192.168.100.3  Bcast:192.168.100.255 Mask:255.255.255.0
           inet6 addr: fe80::7033:eeff:fe29:81ae/64 Scope:Link
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
           RX packets:0 errors:0 dropped:0 overruns:0 frame:0
           TX packets:1 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:0
           RX bytes:0 (0.0 B)  TX bytes:90 (90.0 B)

eth0      Link encap:Ethernet  HWaddr 68:b5:99:c2:7b:a6
           inet addr:172.16.8.22  Bcast:172.16.8.255 Mask:255.255.255.0
           inet6 addr: fe80::6ab5:99ff:fec2:7ba6/64 Scope:Link
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
           RX packets:4432580 errors:0 dropped:0 overruns:0 frame:0
           TX packets:4484811 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:1000
           RX bytes:457880509 (436.6 MiB)  TX bytes:398588034 (380.1 MiB)
           Memory:fe860000-fe880000

eth1      Link encap:Ethernet  HWaddr 68:b5:99:c2:7b:a7
           UP BROADCAST PROMISC MULTICAST  MTU:1500  Metric:1
           RX packets:0 errors:0 dropped:0 overruns:0 frame:0
           TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:1000
           RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
           Memory:fe8e0000-fe900000

lo        Link encap:Local Loopback
           inet addr:127.0.0.1  Mask:255.0.0.0
           inet6 addr: ::1/128 Scope:Host
           UP LOOPBACK RUNNING  MTU:16436  Metric:1
           RX packets:52577 errors:0 dropped:0 overruns:0 frame:0
           TX packets:52577 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:0
           RX bytes:2737820 (2.6 MiB)  TX bytes:2737820 (2.6 MiB)

vnet0     Link encap:Ethernet  HWaddr fe:16:3e:2d:40:3b
           inet6 addr: fe80::fc16:3eff:fe2d:403b/64 Scope:Link
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
           RX packets:0 errors:0 dropped:0 overruns:0 frame:0
           TX packets:5 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:500
           RX bytes:0 (0.0 B)  TX bytes:370 (370.0 B)

And brctl show:

bridge name     bridge id               STP enabled     interfaces
br100           8000.68b599c27ba7       no              eth1
vnet0

Which looks fine to me. However, the VM log shows that it is unable to 
get an IP through DHCP (despite dnsmasq is running):

Starting network...
udhcpc (v1.18.5) started
Sending discover...
Sending discover...
Sending discover...
No lease, failing
WARN: /etc/rc3.d/S40-network failed

What am I doing wrong? Any help would be very much appreciated.

Thanks in advance,

Javier

-- 
Javier Álvarez Cid-Fuentes
Grid Computing and Clusters Group
Barcelona Supercomputing Center (BSC-CNS)
Tel. (+34) 93 413 72 46



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