目录

[隐藏]

Understanding FlatNetworking

(this took me quite a while to get into my head, so I'm writing it down for anyone else)

OpenStack/Nova has two general catagories (as of Cactus/Diablo releases) for networking:

FlatNetworking

FlatNetworking uses ethernet adapters configured as bridges to allow network traffic to transit between all the various nodes. This setup can be done with a single adapter on the physical host, or multiple. This option _*does not*_ require a switch that does VLAN tagging (VLANNetworking does) - and is a common development installation or proof of concept setup.

Single Adapter, All in one setup

  • extremely common development setup

Multiple nodes with a single adapter

  • smoke testing, proof of concept layout

Multiple nodes, multiple adapters

  • server setup with separate admin and data traffic

Outbound Traffic Flow

In any set up with FlatNetworking, the host with `nova-network` on it is responsible for forwarding traffic from the private network configured with the {{--fixed_range=...} directive in nova.conf. This host needs to have br100 configured and talking to any other nodes that are hosting VMs. With either of the Flat Networking options, the default gateway for the virtual machines is set to the host which is running `nova-network`. You must set the --flat_network_bridge flag or create networks with the bridge parameter in order to avoid raising an error.

Single adapter hosts

  • When a virtual machine sends traffic out to the public networks, it sends it first to it's default gateway (where ever `nova-network` is configured)

  • Then the host on which `nova-network` is configured acts as a router and forwards the traffic out to the Internet.

#!wiki caution
If you're using a single interface, then that interface (often eth0) needs to be set into promiscuous mode for the forwarding to happen correctly. This _does not_ appear to be needed if you're running with physical hosts that have and use two interfaces.

Multiple adapter hosts

  • When a virtual machine sends traffic out to the public networks, it sends it first to it's default gateway (where ever `nova-network` is configured). In a multiple adapter setup, this is over the adapter that is configured as a bridge interface and connected to the other hosts via a switch.

  • Then the host on which `nova-network` is configured acts as a router and forwards the traffic out to the Internet. Typically over the second interface, which has been configured with the hosts internet IP address.

Inbound Traffic

For inbound traffic (assuming a floating IP address has been set up), the `nova-network` host is responsible for hosting that IP address and doing the DNAT/SNAT addressing to route the traffic to the appropriate virtual machine.

认识OpenStack中的flatnetwork的更多相关文章

  1. OpenStack中Keystone的基本概念理解

    原文http://www.kankanews.com/ICkengine/archives/10788.shtml Keystone简介 Keystone(OpenStack Identity Ser ...

  2. openstack中eventlet使用

    openstack中使用eventlet的协程来实现并发. 第一种,使用eventlet.GreenPool来管理绿色线程 如l3-agent在开启了8个绿色线程来处理router消息 def _pr ...

  3. 探索 OpenStack 之(14):OpenStack 中 RabbitMQ 的使用

    本文是 OpenStack 中的 RabbitMQ 使用研究 两部分中的第一部分,将介绍 RabbitMQ 的基本概念,即 RabbitMQ 是什么.第二部分将介绍其在 OpenStack 中的使用. ...

  4. openstack中彻底删除计算节点的操作记录

    在使用openstack的过程中,我们经常会添加好几台计算节点来部署虚拟机,在后续使用中由于某些原因,一些计算节点出现了问题,需要将这些出了问题的计算节点从openstack的控制节点中踢出去!但是很 ...

  5. OpenStack中给wsgi程序写单元測试的方法

    在 OpenStack 中, 针对web应用, 有三种方法来写单元測试 1) 使用webob生成模拟的request from __future__ import print_function imp ...

  6. openstack中iptables的使用

    openstack中nova使用了iptables实现其网络相关功能,乍看openstack的iptables表比较复杂,整理了一下iptables的filter表和nat表的结构,以一个all in ...

  7. OpenStack中memcached的使用和实现

    概述 主要分享下个人对Liberty版本openstack中cache使用的理解,由于作者水平有限,难免有所错误,疏漏,还望批评指正. openstack中可以使用cache层来缓存数据,Libert ...

  8. openstack中的环境准备

    openstack中环境准备基于Ubuntu系统 author:headsen chen   2017-10-13  11:51:50 个人原创,转载请注明作者,出处. 6 apt-get insta ...

  9. OpenStack中部署glance的步骤

    OpenStack中部署glance的步骤(基于Ubuntu14.04系统) author:headsen  chen   2017-10-13   08:34:35 个人原创,转载请注明作者,出处, ...

随机推荐

  1. C# Byte[]、Image、Bitmap 之间的相互转换

    //byte[] 转图片 public static Bitmap BytesToBitmap(byte[] Bytes) { MemoryStream stream = null; try { st ...

  2. 基于PHP采集数据入库程序(二)

    在上篇基于PHP采集数据入库程序(一) 中提到采集新闻信息页的列表数据,接下来讲讲关于采集新闻具体内容 这是上篇博客的最终数据表截图: 接下来要做的操作就是从数据库中读取所需要采集的URL,进行页面抓 ...

  3. 【Linux】理解分区

    http://blog.csdn.net/aaronychen/article/details/2270048 主分区逻辑分区设置 http://forum.ubuntu.org.cn/viewtop ...

  4. lua封装的位运算

    1.移位运算基础 --与 同为1,则为1 --或 有一个为1,则为1 --非 true为 false,其余为true --异或 相同为0,不同为1 --ZZMathBit = {} function ...

  5. 如果BarTender出现卸载不干净的问题如何处理

    自从BarTender 2016出了之后,好多小伙伴都想试试新功能咋样,这就意味着首先要卸载电脑上旧版BarTender.然而就是这个操作,难倒了好一批人,他们表示BarTender卸载卸不干净,不仅 ...

  6. opencv获取IP摄像头(IP-camera)实时视频流

    之前这篇文章讲了如何通过网络摄像头(web camera)获取实时视频流,但是这种方法的缺陷就是摄像头和主机必须连在一起,那这种在室外部署的时候就会非常麻烦并且不安全,所以后来找了下用海康威视或者大华 ...

  7. JS匿名函数理解

    匿名函数的基本形式为(function(){...})(); 前面的括号包含函数体,后面的括号就是给匿名函数传递参数并立即执行之 匿名函数的作用是避免全局变量的污染以及函数名的冲突   1.小括号的作 ...

  8. openURL调用其他程序(转)

    转自:http://blog.csdn.net/iefreer/article/details/8812708 一个应用程序,可以调用其它的应用程序的. 和其它应用程序进行通讯如果一个应用程序支持一些 ...

  9. Git Step by Step – (6) Git远程仓库

    前面文章中出现的所有Git操作都是基于本地仓库的,但是日常工作中需要多人合作,不可能一直都在自己的代码仓库工作.所以,这里我们就开始介绍Git远程仓库. 在Git系统中,用户可以通过push/pull ...

  10. 【代码审计】XIAOCMS_存在任意文件删除漏洞分析

      0x00 环境准备 XIAOCMS官网: http://www.xiaocms.com/ 网站源码版本:XiaoCms (发布时间:2014-12-29) 程序源码下载:http://www.xi ...