[Kimchi-devel] [RFC] Live migration backend + API

Hi, Live migration will be one of the new features for Kimchi 2.0 and I've been investigating it for a week or so. This is how I'm planning to implement it: - API: The API will be similar to the API of the 'cloneGuest', but with extra parameters: url : 'plugins/kimchi/vms/' +'vm_name' + "/migrate" type: 'POST' parameters: * destination: the IP address of the destination host * (optional, not sure if applicable) password: the password to log in the destination via ssh tunnel In my opinion we can start with a 'migrate' button in the options of the VM, which will open up a new window to insert the destination IP address. This of course thinking about the old UI. I believe we can do whatever it is done with the 'Clone' function in the case of the new UI, with this extra window. As the migration might take a while, we'll need a progress bar or something to demonstrate that the progress is still ongoing. Again, the same thing as clone does :) - backend and core functionality: This is where it gets tricky. Libvirt has *a lot* of ways to do a live migration between hosts. My approach, at least for this first attempt, will be focusing in a single way, implement it, stabilize it and then extend it to the other migration types, if necessary. Same thing goes for the preset up. The only way I managed to do a live migration was with a NFS storage pool in both hosts, same name and same NFS server. This shared storage is necessary because the live migration will *not* copy the disks of the VM, just the RAM memory. I had to share ssh keys between the hosts to allow for password less ssh sessions. At first, I want to relieve this first implementation from this pre config, which will have to be done entirely by the user. If everything goes well, I can add a few automation in this process inside the backend before the 2.0 launch. Kimchi internals will be implemented by using async task facilities. Any questions? Comments? Daniel