Product : AppScale, Eucalyptus/Current, 4.4.5
Feature : VM to host anti-affinity, Compute, Infrastructure Services
Content Owner:  John Gallucci
Summary
Not supported. Can only be achieved by backend administration using instance migration.
Details
http://docs.eucalyptus.cloud/eucalyptus/4.4.5/index.html#admin-guide/manage_nodes.html