[libvirt-users] migrate local storage to ceph | exchanging the storage system

[Dominique Ramaekers]

> -----Oorspronkelijk bericht-----
> Van: libvirt-users-bounces at redhat.com [mailto:libvirt-users-
> bounces at redhat.com] Namens Björn Lässig
> Verzonden: vrijdag 27 mei 2016 10:10
> Aan: libvirt-users at redhat.com
> Onderwerp: [libvirt-users] migrate local storage to ceph | exchanging the
> storage system
> 
> TLDR: Why is virsh migrate --persistent --live domain
> qemu+ssh://root@host/system --xml domain.ceph.xml
> not persistent and what could i do about it?
> 
> Hi,
>  after years of beeing pleased with local storage and migrating the complete
> storage from one host to another, it was time for ceph.
> 
> After setting up a cluster and testing it, its time now for moving a lot of VMs on
> that type of storage, without a disturbance if possible.
> 
> So I 'virsh dumpxml domain > domain.ceph.xml', edit the file, replace // ---- old
> ---- // <disk type='file' device='disk'>
>   <driver name='qemu' type='qcow2' cache='none'/>
>   <source file='domain.img'/>
>   <backingStore/>
>   <target dev='vda' bus='virtio'/>
>   <alias name='virtio-disk0'/>
>   <address type='pci' domain='0x0000' bus='0x00' slot='0x04'
> function='0x0'/>
> </disk>
> 
> // ---- with new ---- //
> <disk type='network' device='disk'>
>   <driver name='qemu' type='raw'/>
>   <auth username='libvirt'>
>     <secret type='ceph' uuid='53e4ba03-5ad0-4f1e-b69e-897afba272ff'/>
>   </auth>
>   <source protocol='rbd' name='libvirt/domain'>
>     <host name='cephmon0' port='6789'/>
>     <host name='cephmon1' port='6789'/>
>     <host name='cephmon2' port='6789'/>
>   </source>
>   <backingStore/>
>   <target dev='vda' bus='virtio'/>
>   <boot order='1'/>
>   <alias name='virtio-disk0'/>
>   <address type='pci' domain='0x0000' bus='0x00' slot='0x04'
> function='0x0'/>
> </disk>
> 
> Now i'm calling:
> 
> root at host_a:~# virsh migrate --verbose --p2p --copy-storage-all --persistent --
> change-protection --abort-on-error --undefinesource --live domain
> qemu+ssh://root@host_b/system --xml domain.ceph.xml

Weird: The domain should be persistent

You can make an transient domain persistent by doing a 'virsh define domain.ceph.xml'


> 
> This takes its time to copy everything into ceph, but when its over, i never have
> to migrate Terabytes of Storage again.
> 
> But its not over.
> The new domain definition on host_b is not persistent and after a shutdown,
> local storage is used again.
> 
> What do i have todo, to make this change persistent, or is there a better way
> for doing this?
> 
> (i am using libvirt 1.2.9)
> 
> Thanks in advance
> Björn Lässig
> --
> Pengutronix e.K.                         |                             |
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