July 2011
Intermediate to advanced
88 pages
1h 52m
English
Content preview from Deploying OpenStack
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
Chapter 3. Understanding Glance
Glance is the newest OpenStack service. First debuting in the Bexar release, Glance provides a catalog service for storing and querying virtual disk images. Glance has been designed to be a standalone service for those needing to organize large sets of virtual disk images. However, when used along with Nova and Swift, it provides an end-to-end solution for cloud disk image management.
Architecture
There are three pieces to Glance architecture: glance-api, glance-registry, and the image store. As you can probably guess, glance-api accepts API calls, much like nova-api, and the actual image blobs are placed in the image store. The glance-registry stores and retrieves metadata about images. The image store can be a number of different object stores, including Swift. Figure 3-1 illustrates Glance’s logical architecture.
Figure 3-1. Glance Logical Architecture
glance-api is similar in functionality to nova-api, in that it accepts incoming API requests and then communicates with the other components (glance-registry and the image store) to facilitate querying, retrieving, uploading, or deleting images. By default, glance-api listens on port 9292.
Caution
In the Cactus release, Glance lacks authentication and authorization, making it unsuitable for direct end user usage except in tightly controlled environments. The best way to use this is “behind” Nova, where ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.