[Openstack] Nova compute and network service are not starting after upgrading to Ubuntu 14.04

He, Jiantao H jiantao.h.he at intel.com
Thu Oct 9 01:28:32 UTC 2014

May be your bridges were deleted, what about 'ovs-vsctl show' command said?

From: Narayanan, Krishnaprasad [mailto:narayana at uni-mainz.de]
Sent: Thursday, October 9, 2014 07:23
To: 'openstack at lists.openstack.org'
Subject: Re: [Openstack] Nova compute and network service are not starting after upgrading to Ubuntu 14.04

Dear all,

In continuation with my email below, can somebody suggest me the steps to recover / setup a VNIC that was deleted from the compute node after upgradation process.

When I tried executing ifconfig -a "name of the virtual interface" on the compute node, I am getting an error which displays "No device found".


From: Narayanan, Krishnaprasad
Sent: Mittwoch, 8. Oktober 2014 18:11
To: 'openstack at lists.openstack.org'
Subject: Nova compute and service are not starting after upgrading to Ubuntu 14.04

Hallo all,

I upgraded the operating system of one of the compute nodes in our cloud infrastructure from Ubuntu 12.04 to 14.04 and after the upgradation, I found that the nova-compute and network service were not started. The network configuration in our Havana setup is based on FlatDHCP manager. After the reboot process, I saw the nova-compute and network service was started but after a minute, they were stopped. When I executed "ps aux | grep nova" on the terminal, I saw a strange observation where I found more than 10 process related to nova-api service.

The message in the nova-compute log is: "WARNING nova.virt.libvirt.driver [-] URI qemu:///system does not support events: Cannot write data: Broken pipe
2014-10-08 16:58:41.249 1968 ERROR nova.openstack.common.threadgroup [-] internal error: client socket is closed".

The version of nova and nova-manage in the cloud controller and compute node are different. In the controller node, the nova version is 2.15.0 and nova-manage version is 2013.2.2 whereas on the compute node, their version is 2.17.0 and is 2014.1.2

Can I kindly know whether the problem is due to the following?

a)      The version mis-match of the nova components in the controller and compute node

b)      Are there any configurations that are to be updated in the libvirt / qemu / nova / nova-compute?

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