Author: Piotr Siwczak

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In one of my previous posts I outlined some considerations when deploying OpenStack and different approaches to distribution of OpenStack services across hardware to provide HA. However, it is not the OpenStack services themselves that drive the value of going to cloud. I mean, even once high-availability of OpenStack services is assured, the instances and storage will not perform optimally …

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Many thanks to all of you who attended our webcast on 'What's new in OpenStack Folsom' this past Thursday October 4. There were more questions than we had time for in the allotted hour, so I transcribed them and did my best to address them here. If you had a question that didn't get answered, look for your initials with …

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When I was designing my first OpenStack infrastructure I struggled to find information on how to distribute its numerous parts across the hardware. I studied a number of documents, including Rackspace's reference architecture (which was once at http://referencearchitecture.org but now seems to be mothballed). I also went through the design diagrams presented in the OpenStack documentation. I must admit that back …

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There is an old saying in IT: "Tough guys never do backups." While this kind of thinking doesn't prevent infrastructures from functioning, it's definitely asking for trouble. And the same goes for monitoring. Having gone through all the pain of polishing an OpenStack installation, I can see why it might seem like a better idea to grab a couple of beers …

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Oleg Gelbukh's last blog article gave us a bird's eye view of different aspects of high availability in OpenStack. Even though all OpenStack components are designed with high availability in mind, the software still relies on external software, such as the database and the messaging system. It is left up to the user to deploy them in a fail-proof manner. It …

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In a couple of recent posts I covered some fundamental concepts of OpenStack networking, including VlanManager and floating IPs. This post builds upon the recent content and aims to present how traffic flows in different scenarios addressed by OpenStack. Reading the prior posts (VlanManager, FloatingIPs) is highly recommended before going through this blog post. Also, consider before reading that all the scenarios …

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Mirantis OpenStack ExpressDeveloper Edition:Get Private-Cloud-as-a-Service for a year free. Recently I outlined how VlanManager works and how it ensures network scalability and tenant isolation. Up to this point, however, I've only dealt with fixed IP networks of different tenants. While fixed IPs are what instances are given by default, they do not ensure that the instance is immediately reachable from the outside …

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In a previous post I explained the basic mode of network operation for OpenStack, namely FlatManager and its extension, FlatDHCPManager. In this post, I'll talk about VlanManager. While flat managers are designed for simple, small scale deployments, VlanManager is a good choice for large scale internal clouds and public clouds. As its name implies, VlanManager relies on the use of …

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Over time, networking in OpenStack has been evolving from a simple, barely usable model, to one that aims to support full customer isolation. To address different user needs, OpenStack comes with a handful of "network managers". A network manager defines the network topology for a given OpenStack deployment. As  of the current stable "Essex" release of OpenStack, one can choose …

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