Matt Riedemann
6ebee92445
This adds the "compute:servers:resize:cross_cell" policy rule which is now used in the API to determine if a resize or cold migrate operation can be performed across cells. The check in the API is based on: - The policy check passing for the request. - The minimum nova-compute service version being high enough across all cells to perform a cross-cell resize. If either of those conditions fail a traditional same-cell resize will be performed. A docs stub is added here and will be fleshed out in an upcoming patch. Implements blueprint cross-cell-resize Change-Id: Ie8a0f79a3b16e02b7a34a1b81f547013a3d88996
44 lines
1.4 KiB
ReStructuredText
44 lines
1.4 KiB
ReStructuredText
================
|
|
Configure resize
|
|
================
|
|
|
|
Resize (or Server resize) is the ability to change the flavor of a server, thus
|
|
allowing it to upscale or downscale according to user needs. For this feature
|
|
to work properly, you might need to configure some underlying virt layers.
|
|
|
|
For cross-cell resize, refer to :doc:`/admin/configuration/cross-cell-resize`.
|
|
|
|
Virt drivers
|
|
------------
|
|
|
|
.. todo:: This section needs to be updated for other virt drivers, shared
|
|
storage considerations, etc.
|
|
|
|
KVM
|
|
~~~
|
|
|
|
Resize on KVM is implemented currently by transferring the images between
|
|
compute nodes over ssh. For KVM you need hostnames to resolve properly and
|
|
passwordless ssh access between your compute hosts. Direct access from one
|
|
compute host to another is needed to copy the VM file across.
|
|
|
|
Cloud end users can find out how to resize a server by reading
|
|
:doc:`/user/resize`.
|
|
|
|
XenServer
|
|
~~~~~~~~~
|
|
|
|
To get resize to work with XenServer (and XCP), you need to establish a root
|
|
trust between all hypervisor nodes and provide an ``/image`` mount point to
|
|
your hypervisors dom0.
|
|
|
|
Automatic confirm
|
|
-----------------
|
|
|
|
There is a periodic task configured by configuration option
|
|
:oslo.config:option:`resize_confirm_window` (in seconds).
|
|
If this value is not 0, the ``nova-compute`` service will check whether
|
|
servers are in a resized state longer than the value of
|
|
:oslo.config:option:`resize_confirm_window` and if so will automatically
|
|
confirm the resize of the servers.
|