Posts by: 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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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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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 …