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Author Archives: Dan
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
Jeep JK Air Tank Install
A year ago, I added onboard air to our Jeep. It had always been something I wanted to do (since the last Jeep) and I can say it’s definitely one of the best things I’ve done to it. Not only … Continue reading
Posted in Uncategorized
Tagged 4x4, air, arb, compressor, jeep, tank, viair
Oregon Back Country Discovery Route Maps from OOHVA
I recently found out about a bunch of cool backcountry overlanding routes maintained by the folks at Oregon Off-Highway Vehicle Association (OOHVA) called the Oregon Back Country Discovery Route (OBCDR). These routes are hand-picked to provide hundreds of miles of … Continue reading
Posted in Miscellaneous
Tagged backcountry, camping, jeep, oregon, overlanding, wilderness
Automatic cycle hack for a small compressor
This is a project I did quite a while ago, which has been working well for me ever since. I get a lot of looks when airing up my tires and so I thought I’d do a bit of a … 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