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I assume you are running a compute node co-located in your controller so in practice you have two compute nodes, right? Live migration will make your instance move between compute nodes with almost no state loss, but it has to be configured before it can be used.

You will need to configure at least: 1) password-less SSH access between the compute nodes 2) libvirt should be configured to listen for TCP connections 3) an NFS server to host the image for both compute nodes, or use the simpler 'block migration' option, where no NFS server is needed and the image is copied from one node to the other before each migration.

Here's a guide to understand configuration:

You can check the '/var/log/nova/nova-compute.log' file on each compute node to see what's going on.