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<p class="MsoNormal">Hallo all,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">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. <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">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<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">2014-10-08 16:58:41.249 1968 ERROR nova.openstack.common.threadgroup [-] internal error: client socket is closed”.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">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<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Can I kindly know whether the problem is due to the following?<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span lang="EN-US"><span style="mso-list:Ignore">a)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US">The version mis-match of the nova components in the controller and compute node<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span lang="EN-US"><span style="mso-list:Ignore">b)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US">Are there any configurations that are to be updated in the libvirt / qemu / nova / nova-compute?
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Krishnaprasad<o:p></o:p></span></p>
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