[Openstack] Instance can not ping each other

Mitchell Chen mitchell.chen at mediatek.com
Fri Feb 27 18:18:10 UTC 2015

Hi Mark and All,

Thank you for the indication to test the neutron agents. I typed "neutron agent-list" in my control and neutron nodes, but nothing returns: What does that mean?

root at mussdhux23:/home/stack/Openstack# neutron agent-list

root at mussdhux20:/home/stack/Openstack# neutron agent-list

I had restarted the neutron services after my neutron node booted up by typing the following commands, but "neutron agent-list" still return nothing.

service neutron-plugin-openvswitch-agent restart

service neutron-l3-agent restart

service neutron-dhcp-agent restart

service neutron-metadata-agent restart

Please help how to start up the neutron agents.

Thank you for the help,


From: Mark Loza [mailto:mloza at morphlabs.com]
Sent: Friday, February 27, 2015 3:59 AM
To: Mitchell Chen; openstack at lists.openstack.org
Subject: Re: [Openstack] Instance can not ping each other

I assume you are using neutron instead of nova-network

On 2/27/15 7:57 PM, Mark Loza wrote:

Did you check if the neutron agents are all alive?

# neutron agent-list

On 2/27/15 3:49 PM, Mitchell Chen wrote:
Hi All,

I followed the OpenStack icehouse installation guide to successfully install a five node system, one control node, one neutron and three compute nodes.  Inside of the instance, I can ping other instances' virtual IP address and outside internet fine. Recently, we decided to move all the nodes to a lab. So, I powered down the five nodes before the move and powered up them afterward. All the physical network connections were exactly the same as they were before the move. But, I can not even ping other instance after the five nodes up again.

I typed "route -n" inside of the instance, no any IP is shown. What's wrong? Please help how I can get the instance networking back.


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