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Category Archives: OpenStack
Start and Monitor Image Pre-cache Operations in Nova
When you boot an instance in Nova, you provide a reference to an image. In many cases, once Nova has selected a host, the virt driver on that node downloads the image from Glance and uses it as the basis … Continue reading
Evacuate in nova: one command to confuse us all
If you’ve ever used OpenStack Nova, you’ve probably at least seen our plethora of confusing commands that involve migrating instances away from a failing (or failed) compute host. If you are brave, you’ve tried to use one or more of … Continue reading
Upgrades in Nova: Database Migrations
This is a part of a series of posts on the details of how Nova supports live upgrades. It focuses on one of the more complicated pieces of the puzzle: how to do database schema changes with minimal disruption to … Continue reading
Posted in OpenStack
Tagged database, nova, nova-upgrade-details, online-migrations, schema, upgrades
Upgrades in Nova: Objects
This is a part of a series of posts on the details of how Nova supports live upgrades. It focuses on a very important layer that plays several roles in the system, providing a versioned RPC and database-independent facade for … Continue reading
Upgrades in Nova: RPC APIs
This is a part of a series of posts on the details of how Nova supports live upgrades. It focuses on the very important task of doing proper versioning and handling compatibility in your RPC APIs, which is a baseline … Continue reading
Posted in OpenStack
Tagged compatibility, nova, nova-upgrade-details, rpc, upgrades, versioning
Upgrades in Nova: The Details
Over the last few years, the Nova project has spent a lot of time on improving its story around live upgrades. We’ve made a lot of progress and done so with minimal disruption as we were figuring out how to … Continue reading
Posted in OpenStack
Tagged nova, nova-upgrade-details, upgrades
Upgrading Nova to Kilo with minimal downtime
Starting in Icehouse, Nova gained the ability to do partial live upgrades. This first step meant that control services (which are mostly stateless) could be upgraded along with database schema before any of the compute nodes. After that step was … Continue reading
A brief overview of Nova’s new object model (Part 3)
In parts one and two, I talked about the reasoning for developing an object model inside of Nova, as well as showed a sample implementation for a toy object. In this part, I will examine parts of some “real” objects … Continue reading
Posted in OpenStack
Tagged Instance, nova, NovaObject, objects, openstack, SecurityGroup, serialization
A brief overview of Nova’s new object model (Part 2)
In Part 1, I described the problems that the Unified Object Model aims to solve within Nova. Next, I’ll describe how the infrastructure behind the scenes achieves some of the magic of making things easier for developers to implement their … Continue reading
Posted in OpenStack
Tagged db, nova, NovaObject, objects, rpc, unified-object-model
A brief overview of Nova’s new object model (Part 1)
As discussed at the Havana summit, I have been working with Chris Behrens (and others) on the unified-object-model blueprint for Nova. The core bits of it made their way into the tree a while ago and work is underway to … Continue reading
Posted in OpenStack
Tagged api, db, no-db-compute, nova, NovaObject, objects, rpc, unified-object-model