Automating Live Migration

Automating Live Migration

[Sukanto Ghosh]

Hi,

What needs to be done in case I want to automate the live migration of
the guests (e.g. for load balancing) ?

I want to have some programs running on multiple nodes, which will
monitor the load on the respective hosts and in case of imbalance can
automatically migrate a guest from one host to another.

What is the interface by which this migration request/command can be
sent to the particular kvm-userspace (at source host) ?

Can this be done using userspace programs or we need kernel modules ?

Getting the destination ready for incoming migration is I guess
straightforward.


-- 
Regards,
Sukanto Ghosh

Re: Automating Live Migration

[Uri Lublin]

Sukanto Ghosh wrote:
> Hi,
> 
> What needs to be done in case I want to automate the live migration of
> the guests (e.g. for load balancing) ?
> 
> I want to have some programs running on multiple nodes, which will
> monitor the load on the respective hosts and in case of imbalance can
> automatically migrate a guest from one host to another.
> 
> What is the interface by which this migration request/command can be
> sent to the particular kvm-userspace (at source host) ?
> 
> Can this be done using userspace programs or we need kernel modules ?
> 
> Getting the destination ready for incoming migration is I guess
> straightforward.
> 
> 


Please take a look at http://kvm.qumranet.com/kvmwiki/Migration

Basically you need to be able to send qemu monitor commands to your kvm-qemu. 
For example redirect the monitor to a unix domain socket (e.g. with -monitor 
/tmp/vmid.monitor) and connect your program to that socket. When you want to 
migrate that VM issue a migrate monitor command, and checkout the result (info 
migration).

Uri.

Re: Automating Live Migration

[Sukanto Ghosh]

> Please take a look at http://kvm.qumranet.com/kvmwiki/Migration
>
> Basically you need to be able to send qemu monitor commands to your
> kvm-qemu. For example redirect the monitor to a unix domain socket (e.g.
> with -monitor /tmp/vmid.monitor) and connect your program to that socket.
> When you want to migrate that VM issue a migrate monitor command, and
> checkout the result (info migration).
>
> Uri.
>

Just what I was looking for. Seems very flexible. Thanks :)

-- 
Regards,
Sukanto Ghosh