Any word yet?

On Fri, Jul 12, 2019 at 3:37 PM Donny Davis <donny@fortnebula.com> wrote:
How is the recovery coming along Gökhan?  I am curious to hear. 

On Fri, Jul 12, 2019 at 3:46 AM Gökhan IŞIK <skylightcoder@gmail.com> wrote:
Awesome, thanks! Donny,
I followed below steps and rescue my instance.

  1.  Find instance id and compute host

    root@infra1-utility-container-50bcf920:~# openstack server show 1d2e8a39-97ee-4ce7-a612-1b50f90cc51e -c id  -c OS-EXT-SRV-ATTR:hypervisor_hostname
+-------------------------------------+--------------------------------------+
| Field                               | Value                                |
+-------------------------------------+--------------------------------------+
| OS-EXT-SRV-ATTR:hypervisor_hostname | compute06                            |
| id                                  | 1d2e8a39-97ee-4ce7-a612-1b50f90cc51e |
+-------------------------------------+--------------------------------------+
 

  2.  Find image and backing image file on compute host

    root@compute06:~# qemu-img info -U  --backing-chain /var/lib/nova/instances/1d2e8a39-97ee-4ce7-a612-1b50f90cc51e/disk
image: /var/lib/nova/instances/1d2e8a39-97ee-4ce7-a612-1b50f90cc51e/disk
file format: qcow2
virtual size: 160G (171798691840 bytes)
disk size: 32G
cluster_size: 65536
backing file: /var/lib/nova/instances/_base/a1960f539532979a591c5f837ad604eedd9c7323
Format specific information:
    compat: 1.1
    lazy refcounts: false
    refcount bits: 16
    corrupt: false
image: /var/lib/nova/instances/_base/a1960f539532979a591c5f837ad604eedd9c7323
file format: raw
virtual size: 160G (171798691840 bytes)
disk size: 18G


  3. Copy image and backing image file 


    root@compute06:~# cp  /var/lib/nova/instances/1d2e8a39-97ee-4ce7-a612-1b50f90cc51e/disk master
root@compute06:~# cp /var/lib/nova/instances/_base/a1960f539532979a591c5f837ad604eedd9c7323 new-master


  4.  Rebase the image file that was backed off the original file so that it uses the new file i.e new-master then commit those changes back to original file master back into the new base new-master

    root@compute06:~# qemu-img rebase  -b new-master  -U master
    root@compute06:~# qemu-img commit master
    root@compute06:~# qemu-img info new-master



  5.  Convert raw image to qcow2 

    root@compute06:~# qemu-img convert -f raw -O qcow2 new-master new-master.qcow2


  6.  Time to upload glance and then launch instance from this image :)

Thanks,
Gökhan.

Donny Davis <donny@fortnebula.com>, 12 Tem 2019 Cum, 00:56 tarihinde şunu yazdı:
Of course you can also always just pull the disk images from the vm folders, merge them back with the base file, upload to glance and then relaunch the instances. 

You can give this method a spin with the lowest risk to your instances






On Thu, Jul 11, 2019 at 4:10 PM Donny Davis <donny@fortnebula.com> wrote:
You surely want to leave locking turned on. 

You may want to ask qemu-devel about the locking of a image file and how it works. This isn't really an Openstack issue, seems to be a layer below. 

Depending on how mission critical your VM's are, you could probably work around it by just passing in  --force-share into the command openstack is trying to run. 

I cannot recommend this path, the best way is to find out how you remove the lock. 






On Thu, Jul 11, 2019 at 3:23 PM Gökhan IŞIK <skylightcoder@gmail.com> wrote:
In [1] it says "Image locking is added and enabled by default. Multiple QEMU processes cannot write to the same image as long as the host supports OFD or posix locking, unless options are specified otherwise." May be need to do something on nova side. 

I run this command and get same error. Output is in  http://paste.openstack.org/show/754311/

İf I run qemu-img info instance-0000219b with -U , it doesn't give any errors.


Donny Davis <donny@fortnebula.com>, 11 Tem 2019 Per, 22:11 tarihinde şunu yazdı:
Well that is interesting. If you look in your libvirt config directory (/etc/libvirt on Centos) you can get a little more info on what is being used for locking. 

Maybe strace can shed some light on it. Try something like 

strace -ttt -f qemu-img info /var/lib/nova/instances/659b5853-d094-4425-85a9-5bcacf88c84e/disk





On Thu, Jul 11, 2019 at 2:39 PM Gökhan IŞIK <skylightcoder@gmail.com> wrote:
I run virsh list --all command and output is below:

root@compute06:~# virsh list --all
 Id    Name                           State
----------------------------------------------------
 -     instance-000012f9              shut off
 -     instance-000013b6              shut off
 -     instance-000016fb              shut off
 -     instance-0000190a              shut off
 -     instance-00001a8a              shut off
 -     instance-00001e05              shut off
 -     instance-0000202a              shut off
 -     instance-00002135              shut off
 -     instance-00002141              shut off
 -     instance-000021b6              shut off
 -     instance-000021ec              shut off
 -     instance-000023db              shut off
 -     instance-00002ad7              shut off

And also when I try start instances with virsh , output is below:

root@compute06:~# virsh start instance-0000219b
error: Failed to start domain instance-000012f9  
error: internal error: process exited while connecting to monitor:  2019-07-11T18:36:34.229534Z qemu-system-x86_64: -chardev pty,id=charserial0,logfile=/dev/fdset/2,logappend=on: char device redirected to /dev/pts/3 (label charserial0)
2019-07-11T18:36:34.243395Z qemu-system-x86_64: -drive file=/var/lib/nova/instances/659b5853-d094-4425-85a9-5bcacf88c84e/disk,format=qcow2,if=none,id=drive-virtio-disk0,cache=none,discard=ignore: Failed to get "write" lock
Is another process using the image?

Thanks,
Gökhan

Donny Davis <donny@fortnebula.com>, 11 Tem 2019 Per, 21:06 tarihinde şunu yazdı:
Can you ssh to the hypervisor and run virsh list to make sure your instances are in fact down?

On Thu, Jul 11, 2019 at 3:02 AM Gökhan IŞIK <skylightcoder@gmail.com> wrote:
Can anyone help me please ? I can no't rescue my instances yet :(

Thanks,
Gökhan

Gökhan IŞIK <skylightcoder@gmail.com>, 9 Tem 2019 Sal, 15:46 tarihinde şunu yazdı:
Hi folks,
Because of power outage, Most of our compute nodes  unexpectedly shut  down and now I can not start our instances.  Error message is "Failed to get "write" lock another process using the image?". Instances Power status is No State.  Full error log is http://paste.openstack.org/show/754107/. My environment is OpenStack Pike on Ubuntu 16.04 LTS servers and Instances are on a nfs shared storage. Nova version is 16.1.6.dev2. qemu version is 2.10.1. libvirt version is 3.6.0. I saw a commit [1], but it doesn't solve this problem.
There are important instances on my environment. How can I rescue my instances? What would you suggest ?

Thanks,
Gökhan