0f78708d79
This is a first pass at client side version control for rpc. It allows
you to configure a max version of messages that clients are allowed to
send. You can find one example of how clients need to adapt in the
conductor rpcapi. All other changes in rpc apis since the grizzly
release are not applicable to this.
Some future improvements to this could be reporting the versions
supported by running services and having that be discoverable via the
API. We could also consider allow setting these client side version
caps via the API. For now, recommended values for these config
options while attempting a rolling upgrade will just have to be documented.
The config options allow specifying specific rpc api version numbers if
desired, but an alias of 'grizzly' is also supported. So typically at
the start of a rolling upgrade you'd have:
[upgrade_levels]
compute=grizzly
conductor=grizzly
scheduler=grizzly
... etc ...
And as you update all instances of a service, you would remove that bit
from your configuration across the deployment using your config management
system of choice.
DocImpact
Implements blueprint rpc-version-control.
Change-Id: I2c0fd6dd7484c87823846d7c31d6525d93cd1b43
OpenStack Nova README
OpenStack Nova provides a cloud computing fabric controller, supporting a wide variety of virtualization technologies, including KVM, Xen, LXC, VMware, and more. In addition to its native API, it includes compatibility with the commonly encountered Amazon EC2 and S3 APIs.
OpenStack Nova is distributed under the terms of the Apache License, Version 2.0. The full terms and conditions of this license are detailed in the LICENSE file.
Nova primarily consists of a set of Python daemons, though it requires and integrates with a number of native system components for databases, messaging and virtualization capabilities.
To keep updated with new developments in the OpenStack project follow @openstack on Twitter.
To learn how to deploy OpenStack Nova, consult the documentation available online at:
For information about the different compute (hypervisor) drivers supported by Nova, read this page on the wiki:
In the unfortunate event that bugs are discovered, they should be reported to the appropriate bug tracker. If you obtained the software from a 3rd party operating system vendor, it is often wise to use their own bug tracker for reporting problems. In all other cases use the master OpenStack bug tracker, available at:
Developers wishing to work on the OpenStack Nova project should always base their work on the latest Nova code, available from the master GIT repository at:
Developers should also join the discussion on the mailing list, at:
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For information on how to contribute to Nova, please see the contents of the CONTRIBUTING.rst file.
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