[Openstack] Help on devstack network configuration

Batsayan Das batsayan.das at tcs.com
Thu Aug 1 10:51:47 UTC 2013


I am trying to deploy devstack in Dell R910 with Ubuntu 12.04 as host OS. 
Currently one NIC eth1 is enabled in the machine. The host machine is 
connect to open internet through eth1, the eth1 gets IP from DHCP server. 
The eth1 ip is

My intention is to create CentOS VMs with following property.
1. VMs should be able to ping each other
2. VMs are accessible by ssh from any host in 10.135.0.XX network
3. VMs should be connected to open internet. 

To do this I am following the All-In-One: Dedicated Hardware method 
mentioned in http://devstack.org/guides/single-machine.html

My localrc contains the following

disable_service n-net
enable_service q-svc
enable_service q-agt
enable_service q-dhcp
enable_service q-l3
enable_service q-meta
enable_service quantum
# Optional, to enable tempest configuration as part of devstack
enable_service tempest


My observation is

public-subnet  is created in admin project and 
private-subnet is created in demo project.

When I launch a VM instance in demo project it gets IP, and on 
clicking associate floating ip, it gets ip successfully. 

At this point at the shell of the above VM ifconfig does not show up any 
I see one router1 is crated with two interfaces, out of which External 
Gateway interface status with ip is DOWN and Internal 
Interface status with ip is ACTIVE. I am not sure what the 
correct values should be, intuitively the External Gateway should be 

The other website

mentioned that one need to enable bridge FLAT_INTERFACE=br100. I am bit 
confused here. Should I use quantum or n-net? If I use quantum should I 
use bridge or simple floating ip? Should I use both floating ip and 

Looking for your help.

Batsayan Das
Tata Consultancy Services
Mailto: batsayan.das at tcs.com
Website: http://www.tcs.com
Experience certainty.   IT Services
                        Business Solutions
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