May 2018
Intermediate to advanced
256 pages
7h 6m
English
Content preview from OpenStack for Architects - Second Edition
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Database services
All state for the OpenStack web services is stored in a central database, usually a MySQL database. MySQL is usually deployed in an active/passive configuration, but can be made active/active with the Galera replication extension. Galera is clustering software for MySQL (MariaDB in OpenStack) and uses synchronous replication to achieve HA. However, even with Galera, we still recommend directing writes to only one of the replicas; some queries used by the OpenStack services may deadlock when writing to more than one master. With Galera, a load balancer is typically deployed in front of the cluster and is configured to deliver traffic to only one replica at a time. This configuration reduces the mean time to recovery of the ...
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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.