[libvirt] KVM migration with uri = NULL

Chris Lalancette clalance at redhat.com
Sun Apr 19 07:16:53 UTC 2009

Zvi Dubitzky wrote:
> What is the meaning of using virDomainMigrate () with NULL uri.
> Looking at the code of  qemudDomainMigratePrepare2 ()/ qemu_driver.c,   I 
> understand that it tries to perform a migration  to another 
> VM on the same node  . Is that correct ?

No, that's not right.  The URI parameter is generally not needed when you are
doing a live migrate; it's basically there to specify an "alternate" way to
reach the remote qemu process, but I've haven't come across a case where it is
useful yet.  That is, you *should* set URI to NULL, and let libvirt handle the

Chris Lalancette

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