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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I am able to start the VM in virsh. I got a new entry in the GUI but it said Error Spawning.<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Razique Mahroua [mailto:razique.mahroua@gmail.com]
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<b>Sent:</b> Dienstag, 12. November 2013 07:31<br>
<b>To:</b> Narayanan, Krishnaprasad<br>
<b>Cc:</b> openstack<br>
<b>Subject:</b> Re: [Openstack] Recovering VMs in OPenStack ESSEX<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Yes, give the files to the nova.nova user:<o:p></o:p></p>
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<p class="MsoNormal">chown nova: /var/lib/nova/etc…<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On 11 Nov 2013, at 22:30, Narayanan, Krishnaprasad <<a href="mailto:narayana@uni-mainz.de">narayana@uni-mainz.de</a>> wrote:<o:p></o:p></p>
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<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Do I have to change the ownership of these two files?</span><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span class="apple-converted-space"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> </span></span><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">Razique
Mahroua [<a href="mailto:razique.mahroua@gmail.com">mailto:razique.mahroua@gmail.com</a>]<span class="apple-converted-space"> </span><br>
<b>Sent:</b><span class="apple-converted-space"> </span>Dienstag, 12. November 2013 07:29<br>
<b>To:</b><span class="apple-converted-space"> </span>Narayanan, Krishnaprasad<br>
<b>Cc:</b><span class="apple-converted-space"> </span>openstack<br>
<b>Subject:</b><span class="apple-converted-space"> </span>Re: [Openstack] Recovering VMs in OPenStack ESSEX</span><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">yup, should be good : <o:p></o:p></p>
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<p class="MsoNormal"># root > qemu-img create -f qcow2 /var/lib/nova/instances/_base/fc1ff06266a986df09d4293a0be3dbb18884dc1d_0_None 0G<o:p></o:p></p>
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<p class="MsoNormal">On 11 Nov 2013, at 22:28, Narayanan, Krishnaprasad <<a href="mailto:narayana@uni-mainz.de"><span style="color:purple">narayana@uni-mainz.de</span></a>> wrote:<o:p></o:p></p>
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<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I created the base image using the command below. I got a new error “Unable to allow access for disk path /var/lib/nova/instances/_base/ephemeral_0_20_None:
No such file or directory”.</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Can I use a similar command to create the ephemeral disk?</span><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span class="apple-converted-space"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> </span></span><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">Razique
Mahroua [<a href="mailto:razique.mahroua@gmail.com"><span style="color:purple">mailto:razique.mahroua@gmail.com</span></a>]<span class="apple-converted-space"> </span><br>
<b>Sent:</b><span class="apple-converted-space"> </span>Dienstag, 12. November 2013 07:22<br>
<b>To:</b><span class="apple-converted-space"> </span>Narayanan, Krishnaprasad<br>
<b>Cc:</b><span class="apple-converted-space"> </span>openstack<br>
<b>Subject:</b><span class="apple-converted-space"> </span>Re: [Openstack] Recovering VMs in OPenStack ESSEX</span><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">it’s only an empty file provisioned according to your flavour.<o:p></o:p></p>
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<p class="MsoNormal">run this as root:<o:p></o:p></p>
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<p class="MsoNormal"># root > qemu-img create -f qcow2 /var/lib/nova/instances/_base/fc1ff06266a986df09d4293a0be3dbb18884dc1d_20 20G<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">(pay attention to the last characters, I added the size “20G”)<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">Razique<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">On 11 Nov 2013, at 22:02, Narayanan, Krishnaprasad <<a href="mailto:narayana@uni-mainz.de"><span style="color:purple">narayana@uni-mainz.de</span></a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Oh I am sorry. I found the disk. You can ignore my previous email.</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I see a new error now</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">“error: Failed to start domain instance-0000041c</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">error: Unable to allow access for disk path /var/lib/nova/instances/_base/fc1ff06266a986df09d4293a0be3dbb18884dc1d_20: No such file or directory”</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">This means that the base image is missing. Can I know is it possible to get this file fc1ff06266a986df09d4293a0be3dbb18884dc1d_20?</span><o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span class="apple-converted-space"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> </span></span><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">Razique
Mahroua [<a href="mailto:razique.mahroua@gmail.com"><span style="color:purple">mailto:razique.mahroua@gmail.com</span></a>]<span class="apple-converted-space"> </span><br>
<b>Sent:</b><span class="apple-converted-space"> </span>Dienstag, 12. November 2013 06:49<br>
<b>To:</b><span class="apple-converted-space"> </span>Narayanan, Krishnaprasad<br>
<b>Cc:</b><span class="apple-converted-space"> </span>openstack<br>
<b>Subject:</b><span class="apple-converted-space"> </span>Re: [Openstack] Recovering VMs in OPenStack ESSEX</span><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">The _base directory contains only the base (or backing files) images, from which qemu-kvm creates the instance images. <o:p></o:p></p>
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<p class="MsoNormal">Everytime you spawn an instance, OpenStack creates a copy (not exactly a copy) of the image. It puts the base image inside _base (if it doesn’t exist) and create a light image that inherits the changes (the instance) inside /var/lib/nova/instance/instance-UUID/disk<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">the disk is linked to that backing file.<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">If you haven’t terminated it though, the file “disk” should be there. Is it an instance you’ve been able to use or a new one (meaning you never used it)?<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"> On 11 Nov 2013, at 21:45, Narayanan, Krishnaprasad <<a href="mailto:narayana@uni-mainz.de"><span style="color:purple">narayana@uni-mainz.de</span></a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I only rebooted the instance using the GUI. The instance was never terminated. Can I know what is present inside the _base folder in /var/lib/nova/instances?</span><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span class="apple-converted-space"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> </span></span><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">Razique
Mahroua [<a href="mailto:razique.mahroua@gmail.com"><span style="color:purple">mailto:razique.mahroua@gmail.com</span></a>]<span class="apple-converted-space"> </span><br>
<b>Sent:</b><span class="apple-converted-space"> </span>Dienstag, 12. November 2013 06:40<br>
<b>To:</b><span class="apple-converted-space"> </span>Narayanan, Krishnaprasad<br>
<b>Cc:</b><span class="apple-converted-space"> </span>openstack<br>
<b>Subject:</b><span class="apple-converted-space"> </span>Re: [Openstack] Recovering VMs in OPenStack ESSEX</span><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">That means the disk no longer exists. Did you terminated the instance?<o:p></o:p></p>
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<p class="MsoNormal">if so, then you won’t be able to retrieve it. Maybe you have backups?<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">On 11 Nov 2013, at 21:38, Narayanan, Krishnaprasad <<a href="mailto:narayana@uni-mainz.de"><span style="color:purple">narayana@uni-mainz.de</span></a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I did as what you had suggested. I see an different error message now.</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">“error: Failed to start domain instance-UUID</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">error: Unable to allow access for disk path /var/lib/nova/instances/instance-UUID/disk: No such file or directory”</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">This means that the disk is missing. Is it possible to create a disk?</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span class="apple-converted-space"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> </span></span><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">Razique
Mahroua [<a href="mailto:razique.mahroua@gmail.com"><span style="color:purple">mailto:razique.mahroua@gmail.com</span></a>]<span class="apple-converted-space"> </span><br>
<b>Sent:</b><span class="apple-converted-space"> </span>Dienstag, 12. November 2013 05:24<br>
<b>To:</b><span class="apple-converted-space"> </span>Narayanan, Krishnaprasad<br>
<b>Subject:</b><span class="apple-converted-space"> </span>Re: [Openstack] Recovering VMs in OPenStack ESSEX</span><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">No, <o:p></o:p></p>
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<p class="MsoNormal">if you only need the file, create it manually using the prompt:<o:p></o:p></p>
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<p class="MsoNormal">root #> touch /var/lib/nova/instances/instance-UUID/console.log<o:p></o:p></p>
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<p class="MsoNormal">root # > chown nova. !$<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">On 11 Nov 2013, at 20:02, Narayanan, Krishnaprasad <<a href="mailto:narayana@uni-mainz.de"><span style="color:purple">narayana@uni-mainz.de</span></a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">If I get it correct, it has to be created from the virsh console. Can I know is the following procedure correct for the creation of the instance</span><o:p></o:p></p>
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<p class="MsoNormal" style="text-indent:-18.0pt"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">a)</span><span style="font-size:7.0pt;color:#1F497D"> <span class="apple-converted-space"> </span></span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">dumpxml
the instance that is Shutoff</span><o:p></o:p></p>
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<p class="MsoNormal" style="text-indent:-18.0pt"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">b)</span><span style="font-size:7.0pt;color:#1F497D"> <span class="apple-converted-space"> </span></span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">create
an instance using the output of a)</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">If this is the case, it wouldn’t be recognized in OpenStack. Am I missing any link here?</span><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span class="apple-converted-space"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> </span></span><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">Razique
Mahroua [<a href="mailto:razique.mahroua@gmail.com"><span style="color:purple">mailto:razique.mahroua@gmail.com</span></a>]<span class="apple-converted-space"> </span><br>
<b>Sent:</b><span class="apple-converted-space"> </span>Montag, 11. November 2013 19:51<br>
<b>To:</b><span class="apple-converted-space"> </span>Narayanan, Krishnaprasad<br>
<b>Cc:</b><span class="apple-converted-space"> </span><a href="mailto:openstack@lists.openstack.org"><span style="color:purple">openstack@lists.openstack.org</span></a><br>
<b>Subject:</b><span class="apple-converted-space"> </span>Re: [Openstack] Recovering VMs in OPenStack ESSEX</span><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">Try to create it and chown it to nova:<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<br>
On Monday, November 11, 2013, Narayanan, Krishnaprasad wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi Razique,</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I executed the start command on the compute node using the domain name option. I got an error message saying that</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Error:“Failed to start domain instance-UUID”</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Error: Unable to precreate char dev file ‘/var/lib/nova/instances/ instance-UUID/console.log: No such file or directory.</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Can I get help to get rid of this problem?</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Thanks,</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Krishnaprasad</span><o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span class="apple-converted-space"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> </span></span><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">Razique
Mahroua [<a href="mailto:razique.mahroua@gmail.com"><span style="color:purple">mailto:razique.mahroua@gmail.com</span></a>]<span class="apple-converted-space"> </span><br>
<b>Sent:</b><span class="apple-converted-space"> </span>Montag, 11. November 2013 17:22<br>
<b>To:</b><span class="apple-converted-space"> </span>Narayanan, Krishnaprasad<br>
<b>Cc:</b><span class="apple-converted-space"> </span><a href="mailto:openstack@lists.openstack.org"><span style="color:purple">openstack@lists.openstack.org</span></a><br>
<b>Subject:</b><span class="apple-converted-space"> </span>Re: [Openstack] Recovering VMs in OPenStack ESSEX</span><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">You have many solutions for that<o:p></o:p></p>
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<p class="MsoNormal">first try to power it on via <o:p></o:p></p>
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<p class="MsoNormal">$ virsh start <o:p></o:p></p>
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<p class="MsoNormal">and check /var/log/libvritd.log<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">you can use kpartx to discover the partitions within the images, and use the different builtin system tools to fix the partitions<o:p></o:p></p>
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<p class="MsoNormal">fsck.ext4/ xfs_adm, etc…<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">Razique<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">On 11 Nov 2013, at 04:14, Narayanan, Krishnaprasad <<a href="mailto:narayana@uni-mainz.de"><span style="color:purple">narayana@uni-mainz.de</span></a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"> <o:p></o:p></p>
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<p class="MsoNormal"><span lang="DE" style="font-size:11.0pt;font-family:"Calibri","sans-serif"">Hallo all,</span><o:p></o:p></p>
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<p class="MsoNormal"><span lang="DE" style="font-size:11.0pt;font-family:"Calibri","sans-serif""> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">I looked in to forums about recovering VMs in OpenStack ESSEX. In the dashboard, I could see that the VMs status is “Hard rebooting” with power state Shutoff. In virsh,
I could see that the state is Shutoff. The complete process is taking longer time to finish and I assume it is in a unrecoverable state. Can anybody help me in recovering the data on the VM and the VM itself?</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">Thanks,</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">Krishnaprasad</span><o:p></o:p></p>
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