Secure migration of LVM based guests over WAN

Secure migration of LVM based guests over WAN

[Lukas Laukamp]

Hey all,

I have a question about a solution for migrate LVM based guests directly 
over the network.

So the situation: Two KVM hosts with libvirt, multiple LVM based guests
Want to do: Migrate a LVM based guest directly to the other host over an 
secure connection

I know that migration is possible when the VM disks are stored on an 
NFS, GFS2 filer/cluster etc.

So would it be possible to do an offline migration directly with netcat 
or something like that?

Would be greate when someone could help me.

Best Regards

Re: Secure migration of LVM based guests over WAN

[Avi Kivity]

On 10/16/2012 11:12 AM, Lukas Laukamp wrote:
> Hey all,
> 
> I have a question about a solution for migrate LVM based guests directly
> over the network.
> 
> So the situation: Two KVM hosts with libvirt, multiple LVM based guests
> Want to do: Migrate a LVM based guest directly to the other host over an
> secure connection
> 
> I know that migration is possible when the VM disks are stored on an
> NFS, GFS2 filer/cluster etc.
> 
> So would it be possible to do an offline migration directly with netcat
> or something like that?
> 

If all you need is offline, you can use scp to copy each volume to the
destination volume.  Make sure the guests are shut down when you do that.

It is also possible to do a live migration, but unless the destination
and source are in the same IP subnet, the guests are going to lose
connectivity.


-- 
error compiling committee.c: too many arguments to function

Re: Secure migration of LVM based guests over WAN

[Lukas Laukamp]

Am 16.10.2012 11:40, schrieb Avi Kivity:
> On 10/16/2012 11:12 AM, Lukas Laukamp wrote:
>> Hey all,
>>
>> I have a question about a solution for migrate LVM based guests directly
>> over the network.
>>
>> So the situation: Two KVM hosts with libvirt, multiple LVM based guests
>> Want to do: Migrate a LVM based guest directly to the other host over an
>> secure connection
>>
>> I know that migration is possible when the VM disks are stored on an
>> NFS, GFS2 filer/cluster etc.
>>
>> So would it be possible to do an offline migration directly with netcat
>> or something like that?
>>
> If all you need is offline, you can use scp to copy each volume to the
> destination volume.  Make sure the guests are shut down when you do that.
>
> It is also possible to do a live migration, but unless the destination
> and source are in the same IP subnet, the guests are going to lose
> connectivity.
>
>

Hello Avi,

so can I simply copy an logical volume to the path of the volume group 
with scp?

For the live migration theme, it would be no problem when the guests 
looses connectivity, how could be done a live migration?

Best Regards

Re: Secure migration of LVM based guests over WAN

[Avi Kivity]

On 10/16/2012 11:48 AM, Lukas Laukamp wrote:
> Am 16.10.2012 11:40, schrieb Avi Kivity:
>> On 10/16/2012 11:12 AM, Lukas Laukamp wrote:
>>> Hey all,
>>>
>>> I have a question about a solution for migrate LVM based guests directly
>>> over the network.
>>>
>>> So the situation: Two KVM hosts with libvirt, multiple LVM based guests
>>> Want to do: Migrate a LVM based guest directly to the other host over an
>>> secure connection
>>>
>>> I know that migration is possible when the VM disks are stored on an
>>> NFS, GFS2 filer/cluster etc.
>>>
>>> So would it be possible to do an offline migration directly with netcat
>>> or something like that?
>>>
>> If all you need is offline, you can use scp to copy each volume to the
>> destination volume.  Make sure the guests are shut down when you do that.
>>
>> It is also possible to do a live migration, but unless the destination
>> and source are in the same IP subnet, the guests are going to lose
>> connectivity.
>>
>>
> 
> Hello Avi,
> 
> so can I simply copy an logical volume to the path of the volume group
> with scp?

Yes.  Best to enable compression to avoid sending zero blocks.

> 
> For the live migration theme, it would be no problem when the guests
> looses connectivity, how could be done a live migration?
> 

See the -b option to the migrate command.

-- 
error compiling committee.c: too many arguments to function

Re: Secure migration of LVM based guests over WAN

[Lukas Laukamp]

Am 16.10.2012 12:10, schrieb Avi Kivity:
> On 10/16/2012 11:48 AM, Lukas Laukamp wrote:
>> Am 16.10.2012 11:40, schrieb Avi Kivity:
>>> On 10/16/2012 11:12 AM, Lukas Laukamp wrote:
>>>> Hey all,
>>>>
>>>> I have a question about a solution for migrate LVM based guests directly
>>>> over the network.
>>>>
>>>> So the situation: Two KVM hosts with libvirt, multiple LVM based guests
>>>> Want to do: Migrate a LVM based guest directly to the other host over an
>>>> secure connection
>>>>
>>>> I know that migration is possible when the VM disks are stored on an
>>>> NFS, GFS2 filer/cluster etc.
>>>>
>>>> So would it be possible to do an offline migration directly with netcat
>>>> or something like that?
>>>>
>>> If all you need is offline, you can use scp to copy each volume to the
>>> destination volume.  Make sure the guests are shut down when you do that.
>>>
>>> It is also possible to do a live migration, but unless the destination
>>> and source are in the same IP subnet, the guests are going to lose
>>> connectivity.
>>>
>>>
>> Hello Avi,
>>
>> so can I simply copy an logical volume to the path of the volume group
>> with scp?
> Yes.  Best to enable compression to avoid sending zero blocks.
>
>> For the live migration theme, it would be no problem when the guests
>> looses connectivity, how could be done a live migration?
>>
> See the -b option to the migrate command.
>

I will read a little bit about the live migration theme.

Best Regards