29100f9b5a
Addresses review comments from: * https://review.opendev.org/#/c/638269/63/doc/source/admin/configuration/resize.rst * https://review.opendev.org/#/c/696212/6/doc/source/admin/configuration/cross-cell-resize.rst Also updates contributor/resize-and-cold-migrate since that is relatively new and biased toward same-cell resize and cold migrate. However, I chose to link the same-cell resize glossary term to that contributor doc rather than admin/configuration/resize because the admin doc is woefully bare. Part of blueprint cross-cell-resize Change-Id: I93b051252e34c8604cebea617c34e9299ac508d4
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======
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Resize
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======
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Resize (or Server resize) is the ability to change the flavor of a server, thus
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allowing it to upscale or downscale according to user needs. For this feature
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to work properly, you might need to configure some underlying virt layers.
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This document describes how to configure hosts for standard resize.
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For information on :term:`cross-cell resize <Cross-Cell Resize>`, refer to
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:doc:`/admin/configuration/cross-cell-resize`.
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Virt drivers
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------------
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.. todo:: This section needs to be updated for other virt drivers, shared
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storage considerations, etc.
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KVM
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~~~
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Resize on KVM is implemented currently by transferring the images between
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compute nodes over ssh. For KVM you need hostnames to resolve properly and
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passwordless ssh access between your compute hosts. Direct access from one
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compute host to another is needed to copy the VM file across.
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Cloud end users can find out how to resize a server by reading
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:doc:`/user/resize`.
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XenServer
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~~~~~~~~~
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To get resize to work with XenServer (and XCP), you need to establish a root
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trust between all hypervisor nodes and provide an ``/image`` mount point to
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your hypervisors dom0.
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Automatic confirm
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-----------------
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There is a periodic task configured by configuration option
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:oslo.config:option:`resize_confirm_window` (in seconds).
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If this value is not 0, the ``nova-compute`` service will check whether
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servers are in a resized state longer than the value of
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:oslo.config:option:`resize_confirm_window` and if so will automatically
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confirm the resize of the servers.
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