<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd"> <html><head><meta http-equiv="content-type" content="text/html; charset=UTF-8"></head><body style="font-family:Arial;font-size:14px"> "Daniel P. Berrange" <<a href="mailto:berrange@redhat.com">berrange@redhat.com</a>> a écrit : <blockquote style="border-left:2px solid blue;margin-left:2px;padding-left:12px;" type="cite"> On Thu, Mar 31, 2016 at 12:05:07PM +0200, <a href="mailto:villeneu@kassis.univ-brest.fr">villeneu@kassis.univ-brest.fr</a> wrote: <blockquote style="border-left:2px solid blue;margin-left:2px;padding-left:12px;" type="cite"> Hello I use lock_manager with libvirt 1.3 and I would like to know how is exactly calculate the hash SHA256. I would create a table to retreive the name with the hash in case of crash to release manualy the lock.</blockquote> Do you mean in the case of a host crash, and if so what filesystem ? If you are using NFS at lesat so you shouldn't need to know the file names, there is the ability to tell the NFS server to release all locks associated with a dead host. I am using NFS. I have many POOL on an NFS server and I use a special share NFS with all my hypervisors where I put my locks qemu-lock.conf ... lock file_lockspace_dir = "/var/lib/libvirt/images/POOL_ADMIN/lock" ... my POOL are lock file_lockspace_dir = "/var/lib/libvirt/images/POOL_ADMIN/lock" .... my POOL are /var/lib/libvirt/i/var/lib/libvirt/images/POOL_PROD1 /var/lib/libvirt/i/var/lib/libvirt/images/POOL_PROD2 .... In a first time, I tried sanlock with the same configuration but some old VMs often have crashed and the qemu process were in an anormal state ( defunc ), and I wasn't be able to kill correctly the process. The virsh destroy command couldn't remove the VM. from the virsh list ... and I always got Failed to terminate process xxx with SIGTERM: Device or resource busy and the VM is still in the list I wasn't be able to freeing the resource with sanlock and the result was that I couldn't start a VM which crashed before because the lock was still present. I tried sanlock command to release the resource without success. ie sanlock client rem_lockspace -r __LIBVIRT__DISKS__:b90b9c61e2d6413077205907ffb3281a:/var/lib/libvirt/images/POOL_ADMIN/sanlock/b90b9c61e2d6413077205907ffb3281a:0:4 -p 9383 So I decided to try lock_manager , but there is no tools as sanlock to coupled vm name and lock. In a case of crash and if the lock isn't removed I will be with the same problem, it 's one of the reason I want to create a datatable with sha256 checksum and the vm name. <blockquote style="border-left:2px solid blue;margin-left:2px;padding-left:12px;" type="cite"> I do an sha256 hash from /var/lib/libvirt/images/lock/MyVM.img but I don't get the same hash code form virtlockd ?</blockquote> It uses the sha256 has of the filename. How did you generate your hash ? If using shell make sure you don't include a newline ie you want echo -n /var/lib/libvirt/images/lock/MyVM.img | sha256sum not a plain 'echo' as that includes a newline to test before a script with the python libvirt API I am using a very simple python script import hashlib hash_object = hashlib.sha256(b'/var/lib/libvirt/images/POOL_PROD4/WPAD.img') hex_dig = hash_object.hexdigest() print(hex_dig) >>>f52b8ebb9e2922831cf4ff7520ad51ab48af004dbb732155df5e02809a01654c and the lock in the directory when I start the VM is virsh start WPAD ls -alcrt -rw------- 1 root root 0 31 mars 15:02 f12269eb8c7afd6551f2549d245e52182714ae43fd0212626593195a24349605 so I am little confused ... Regards, Daniel Michel -- |: <a href="http://berrange.com" target="_blank">http://berrange.com</a> -o- <a href="http://www.flickr.com/photos/dberrange/" target="_blank">http://www.flickr.com/photos/dberrange/</a> :| |: <a href="http://libvirt.org" target="_blank">http://libvirt.org</a> -o- <a href="http://virt-manager.org" target="_blank">http://virt-manager.org</a> :| |: <a href="http://autobuild.org" target="_blank">http://autobuild.org</a> -o- <a href="http://search.cpan.org/~danberr/" target="_blank">http://search.cpan.org/~danberr/</a> :||: <a href="http://entangle-photo.org" target="_blank">http://entangle-photo.org</a> -o- <a href="http://live.gnome.org/gtk-vnc" target="_blank">http://live.gnome.org/gtk-vnc</a> :|</blockquote> </body></html>