[Kimchi-devel] [PATCH 0/3 v3] Live migration backend

[dhbarboza82 at gmail.com]

From: Daniel Henrique Barboza <dhbarboza82 at gmail.com>

Changes in v3:

- get hostname by using python socket API instead of run_command
with 'hostname' command
- closed remote connection in _migrate_task
- removed 'test:///default' declaration in test files
- added a test to cover the API


Changes in v2:

- changes asked by pvital: verifying host name properly, break line in
docs/API.md, changed the format of i18n messages.
- one of the existing tests was enhanced to support the local host
verification properly.


----

This patch series implements the first release of the Live (and cold!)
migration in Kimchi.

*** Requirements for a VM migration ***

- shared storage. The disk/storage path must be the same at the origin
and destination.

- password-less login

- enough resorces in the destination host to allocate the VM


Limitations of this first version and possible candidates for future work:

- non-shared migration not supported

- do not automate the process of password-less login (but it is able to
verify this condition)

- due to the above limitation, the 'user' parameter value is only 'root'
at this moment

- do not verify the 'shared storage' condition

- do not verify same hypervisor/arch conditions

- the origin VM will shutdown after migration (not sure if can be helped)


*** Curl usage ***

curl -u username -H "Content-Type: application/json" -H "Accept: application/json" -k "https://localhost:10001/plugins/kimchi/vms/<VM NAME>/migrate" -X POST -d '{"remote_host":"insert_remote_IP_address", "user":"username"}'


*** Unit test usage ***

The unit tests for this feature needs an additional parameter in the command line
of ./run-tests.sh:

$ sudo KIMCHI_LIVE_MIGRATION_TEST=remote_host_IP ./run_tests.sh test_livemigration


If this parameter is not supplied the unit test will simply skip. The test also
verifies the password-less condition before trying to test a vm migration.



Daniel Henrique Barboza (3):
  Live migration backend: API and messages
  Live migration backend: control/vms and model/vms changes
  Live migration backend: unit tests

 src/wok/plugins/kimchi/API.json                    |  17 +
 src/wok/plugins/kimchi/control/vms.py              |   3 +
 src/wok/plugins/kimchi/docs/API.md                 |   5 +
 src/wok/plugins/kimchi/i18n.py                     |   7 +
 src/wok/plugins/kimchi/model/vms.py                |  75 ++++-
 src/wok/plugins/kimchi/tests/test_livemigration.py | 356 +++++++++++++++++++++
 src/wok/plugins/kimchi/ui/js/src/kimchi.api.js     |  13 +
 7 files changed, 475 insertions(+), 1 deletion(-)
 create mode 100644 src/wok/plugins/kimchi/tests/test_livemigration.py

-- 
2.4.3