Hello, I have an OpenStack cluster(Newton) which is basically a test cluster. After the regular OS security update and upgrade in all my compute nodes I have problem with New VMs. While launching new VM's Iam getting the Error "ALERT! LABEL=cloudimg-rootfs does not exist Dropping to a shell!" in the console log of VM's. In horizon it is showing as active. Iam booting from image not from volume. Before the update everything was fine.
Then I checked all the logs related to OpenStack and I cant find any info related to this. I spent days and I found that after the update libvirt is now using scsi instead of virtio. I dont know why. All the VM's which I created before the update are running fine and is using 'virtio'. Then I tried to manually change the instancexx.xml file of the libvirt to use " <target dev='vda' bus='virtio'/> " and started the VM again using 'virsh start instancexx'. VM got started and then went to shutdown state. But in the console log I can see VM is getting IP and properly booting without any error and then it goes to poweroff state. 1) Whether this issue is related to the update of libvirt?? If so why libvirt is not using virtio_blk anymore?? Why it is using only virtio_scsi?? Is it possible to change libvirt to use virtio_blk instead of virtio_scsi?? 2) I found nova package version on compute nodes are 14.0.10 and on controller node it is 14.0.1. Whether this is the cause of the problem?? Whether an update in controller node solve this issue?? Iam not sure about this. 3) Why Task status of instancexx is showing as Powering Off in horizon after 'virsh start instancexx' in the compute node?? Why it is not starting the VM with the manually customized .xml file of libvirt?? Any help is really appreciated. -- Thank you for your time and have a nice day, With kind regards, Yedhu Sastri
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