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Thanks for the reply. Network controller assigns a private ip address to the vm launched on compute node. However, I still cannot ping this ip address from the network(controller node). I am running nova-network service only on the controller.


Thanks,
-vj


________________________________
From: Narayan Desai <narayan.desai at gmail.com>
To: Vijay <vijayrg at yahoo.com> 
Cc: "openstack at lists.launchpad.net" <openstack at lists.launchpad.net> 
Sent: Wednesday, May 30, 2012 5:28 PM
Subject: Re: [Openstack] dhcp is not leasing an ip address in vlan mode

This sounds like it might be working properly. In VLAN mode, all
instances are connected to one of the project vlans. The .1 address
(gateway, dhcp, etc) exists on an interface on the nova-network node
(or one of them, in the case that you are running multiple. This
interface is bridged to a tagged interface on the appropriate vlan
tag. On the nova-compute nodes, a vnet interface for the instance is
bridged to the vlan tagged interface. On the compute node, there isn't
an IP interface on this network, so the private IP for instances isn't
reachable, even if the instance is running on the same node.

The canonical test for correct network function is if an instance is
reachable via ping from the nova-network server that is currently
serving the instance's project network.
hth
-nld

On Wed, May 30, 2012 at 5:42 PM, Vijay <vijayrg at yahoo.com> wrote:
> Hello,
> I am trying install Essex in VLAN mode on multiple compute nodes.
>
> I am able to lauch instances on controller (which also runs nova-compute)
> and ping/ssh those instances.
> I am able to launch instances on compute only node. However, I cannot ping
> the VM launched  on compute only node.
> When i did the euca-get-console-output on that instance, I see that it is
> not getting an IP leased from DHCP .. Because of that it is not able to
> reach metadata server.
> Any help is appreciated.
>
> Console output is
> udhcpc (v1.17.2) started
> Sending discover...
> Sending discover...
> Sending discover...
> No lease, forking to background
> starting DHCP forEthernet interface eth0  [  OK  ]
> cloud-setup: checking
> http://169.254.169.254/2009-04-04/meta-data/instance-id
> wget: can't connect to remote host (169.254.169.254): Network is unreachable
> cloud-setup: failed 1/30: up 17.71. request failed
> nova.conf:
> --dhcpbridge_flagfile=/etc/nova/nova.conf
> --dhcpbridge=/usr/local/bin/nova-dhcpbridge
> --logdir=/var/log/nova
> --state_path=/var/lib/nova
> --lock_path=/var/lock/nova
> --force_dhcp_release=True
> --use_deprecated_auth
> --iscsi_helper=tgtadm
> --verbose
> --vncserver_listen=0.0.0.0
> --sql_connection=mysql://novadbadmin:novasecret@192.168.198.85/nova
> --daemonize
> --s3_host=192.168.198.85
> --rabbit_host=192.168.198.85
> --cc_host=192.168.198.85
> --ospi_host=192.168.198.85
> --ec2_host=192.168.198.85
> --ec2_url=http://192.168.198.85:8773/services/Cloud
> --nova_url=http://192.168.198.85:8774/v1.1/
>
> # VLAN mode
> --flat_interface=eth1
> --flat_injected=False
> --flat_network_bridge=br100
> --flat_network_dhcp_start=192.168.4.2
>
> --network_manager=nova.network.manager.VlanManager
> --vlan_interface=eth1
> --public_interface=vlan100
> --allow_same_net_traffic=True
> --fixed_range=192.168.4.0/24
> --network_size=256
> --FAKE_subdomain=ec2
> --routing_source_ip=192.168.198.85
> --glance_api_servers=192.168.198.85:9292
> --image_service=nova.image.glance.GlanceImageService
> --iscsi_ip_prefix=192.168.
> --connection_type=libvirt
> --libvirt_type=qemu
>
> # Keystone
> --auth_strategy=keystone
> --api_paste_config=/etc/nova/api-paste.ini
> --keystone_ec2_url=http://192.168.198.85:5000/v2.0/ec2tokens
>
>
>
>
> Thanks,
> -vj
>
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