Re: Automating Live Migration

[Uri Lublin <uri@il.qumranet.com>]

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.