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Migrating a Domain
When a domain migrates its MAC and IP addresses move with it. Only virtual machines with the same layer-2 network and subnets will successfully migrate. If the destination node is on a different subnet, the administrator must manually configure a suitable EtherIP or IP tunnel in the remote node of domain0. The xend daemon stops the domain and copies the job over to the new node and restarts it. The Red Hat Virtualization RPM does not enable migration from any other host except the localhost (see the /etc/xend-config.sxp file for information). To allow the migration target to accept incoming migration requests from remote hosts, you must modify the target's xen-relocation-hosts-allow parameter. Be sure to carefully restrict which hosts are allowed to migrate, since there is no authentication.
Since these domains have such large file allocations, this process can be time consuming. If you migrate a domain with open network connections, they will be preserved on the host destination, and SSH connections should still function. The default Red Hat Virtualization iptables rules will not permit incoming migration connections. To allow this, you must create explicit iptables rules.
You can use the xm migrate command to perform an offline migration :
xm migrate domain-id [destination domain]
You can use the xm migrate command to perform a live migration:
xm migrate domain-id -l [destination domain]
You may need to reconnect to the domain's console on the new machine. You can use the xm console command to reconnect.
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