==========
XL Migrate
==========

:Author: Zhigang Wang
:Contact: zhigang.x.wang@xxxxxxxxxx
:Date: 2013-03-05

Current Status
==============

* xl migrate leverages ssh/sshd::

      xl migrate <domain> <host>

* In order to migrate a VM without user interactive, we have to configure ssh
  keys for all Servers in a pool. Key management with dynamic Server Pools is
  error prone.

* In certain cases, customers need non-ssl migrate, which greatly improves the
  migration speed. There's no way to do it with ssh.


Proposal
========

* Implement dedicated daemons for ssl and non-ssl migration receive.

* `socat <http://www.dest-unreach.org/socat/>`_ can be used.

* Patch: xen-xl-migrate-socat.patch


Testing
=======

* Install the new Xen.

* Start the services::

      service xl-migrate-received start
      service xl-ssl-migrate-received start

* Start a VM::

      xl create vm.cfg

* Migrate::

      xl migrate -s xl-migrate-command <domid> localhost

* SSL migrate::

      xl migrate -s xl-ssl-migrate-command <domid> localhost

* Speed for PV guest with 1024M memory:

  - ssh: 45s
  - socat: 9s
  - socat ssl: 57s