Hi,
This happened to me once. Firstly, check neutron logs for any errors in 
/var/log/neutron/. If you see errors post them here.
Secondly, Verify that neutron dhcp is running. Verify that you have configured 
OpenStack Data Network correctly, verify VLAN/GRE (whichever applicable) 
configurations from physical switch and then restart neutron services on 
control and compute nodes. Restart the VM and it should get the IP. This worked 
for me. 
For further debugging you can use wireshark/tcpdump on the network 
interfaces/bridges on control and compute node during VM creation to see where 
the dhcp packet is getting dropped. 
RegardsMoiz
Date: Mon, 8 Sep 2014 17:15:28 +0530
From: [email protected]
To: [email protected]
Subject: [Openstack] virtual machine not able to get ip address

hi,
I have configured 3 node setup with icehouse release. able to launch to 
instance . the instance is in active state with no errors ..but it is not 
reachable . 
It is not able to get ip address .. How can i debug forther ..
 below is the Instance console logs ..  

 Sep  8 09:49:08 cirros kern.notice kernel: [    0.000000] Linux version 
3.2.0-60-virtual (buildd@toyol) (gcc version 4.6.3 (Ubuntu/Linaro 
4.6.3-1ubuntu5) ) #91-Ubuntu SMP Wed Feb 19 04:13:28 UTC 2014 (Ubuntu 
3.2.0-60.91-virtual 3.2.55)
Sep  8 09:49:08 cirros kern.info kernel: [    0.000000] Command line: 
LABEL=cirros-rootfs ro console=tty1 console=ttyS0
Sep  8 09:49:08 cirros kern.info kernel: [    0.000000] KERNEL supported cpus:
Sep  8 09:49:08 cirros kern.info kernel: [    0.000000]   Intel GenuineIntel
Sep  8 09:49:08 cirros kern.info kernel: [    0.000000]   AMD AuthenticAMD
Sep  8 09:49:08 cirros kern.info kernel: [    0.000000]   Centaur CentaurHauls
Sep  8 09:49:08 cirros kern.info kernel: [    0.000000] BIOS-provided physical 
RAM map:
Sep  8 09:49:08 cirros kern.info kernel: [    0.000000]  BIOS-e820: 
0000000000000000 - 000000000009fc00 (usable)
Sep  8 09:49:08 cirros kern.info kernel: [    1.176020] acpiphp: ACPI Hot Plug 
PCI Controller Driver version: 0.5
Sep  8 09:49:08 cirros kern.info kernel: [    1.176074] acpiphp: Slot [3] 
registered
Sep  8 09:49:08 cirros kern.info kernel: [    1.176084] acpiphp: Slot [4] 
registered
Sep  8 09:49:08 cirros kern.info kernel: [    1.176093] acpiphp: Slot [5] 
registered
Sep  8 09:49:08 cirros kern.info kernel: [    1.176101] acpiphp: Slot [6] 
registered
Sep  8 09:49:08 cirros kern.info kernel: [    1.176110] acpiphp: Slot [7] 
registered
Sep  8 09:49:08 cirros kern.info kernel: [    1.176118] acpiphp: Slot [8] 
registered
Sep  8 09:49:08 cirros kern.info kernel: [    1.176127] acpiphp: Slot [9] 
registered
Sep  8 09:49:08 cirros kern.info kernel: [    1.176136] acpiphp: Slot [10] 
registered
Sep  8 09:49:08 cirros kern.info kernel: [    1.176145] acpiphp: Slot [11] 
registered
Sep  8 09:49:08 cirros kern.info kernel: [    1.176153] acpiphp: Slot [12] 
registered
Sep  8 09:49:08 cirros kern.info kernel: [    1.181355] ne2k-pci.c:v1.03 
9/22/2003 D. Becker/P. Gortmaker
Sep  8 09:49:08 cirros kern.info kernel: [    1.182476] 8139cp: 8139cp: 10/100 
PCI Ethernet driver v1.3 (Mar 22, 2004)
Sep  8 09:49:08 cirros kern.info kernel: [    1.183854] pcnet32: 
pcnet32.c:v1.35 21.Apr.2008 [email protected]
Sep  8 09:49:08 cirros kern.info kernel: [    1.187792] ip_tables: (C) 
2000-2006 Netfilter Core Team
Sep  8 09:49:19 cirros kern.debug kernel: [   12.192125] eth0: no IPv6 routers 
present
Sep  8 09:52:48 cirros authpriv.info dropbear[295]: Running in background
############ debug end   ##############
  ____               ____  ____
 / __/ __ ____ ____ / __ \/ __/
/ /__ / // __// __// /_/ /\ \ 
\___//_//_/  /_/   \____/___/ 
   http://cirros-cloud.net


login as 'cirros' user. default password: 'cubswin:)'. use 'sudo' for root.
cirros login: 



thanks,
srinivas.


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