[Kimchi-devel] Kimchi migration within peers

[simonjin]

Hi all,

I'm presenting here my proposal for the feature "Guest migration" which
is expected to be implemented for Kimchi 1.4.


    Description

Migrate guest vm within peer/host discovered by Kimchi peers using openSLP.
In the first stage 1, only do migration will be supported,
in stage2, migrateCancel and migrateMonitor will be supported.

*Migration Mode: *
1. Support libvirt tunnelled transport  managed by direct migration.
2. Only support Live migration mode.
3. Only support migration over TCP

*Migration Capability Check*
-  Source libvirtd/client should be able to connect destination libvirtd.
-  CPU architectures compare(X86 vs PPC).
-  No PCI device passthrough.
-  In a shared storage pool and the pool can be access/write by destination.


    REST API

Only one new REST command will be added in stage 1.


        Syntax

POST /vms//<vm-name>//migrate


        Parameters:

in config.py.in:

         ('migration_destination_timeout', '21600',
             'Maximum time the destination waits for the migration to 
finish.
            21600 should be enough since all the peers will be in the 
same LAN'),

         ('migration_max_bandwidth', 'unlimited',
               'default in libvirt is unlimited'),

         ('migration_downtime', '500',
             'Maxmium allowed downtime for live migration in milliseconds '
             '(anything below 100ms is ignored) if you do not care about '
             'liveness of migration, set to a very high value, such as '
             '600000.'),


        Return:

An asynchronous Task with "target_uri" containing "/vms/</new-vm-name/>".
As expected with any Task, the cloning process can be tracked by
checking the corresponding task's status.

*Do_migration step:*
-  migration source check .
-  connect migration destination, guest vm config/params transfer and setup.
-  migration source prepare.
-  do actually migration.
-  recover if failed.
-  do finish if migration successful.


Comments are welcome!

-- 
Yun Tong Jin, Simon
Linux Technology Center, Open Virtualization project
IBM Systems & Technology Group
jinyt at cn.ibm.com, Phone: 824549654

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