在上一篇文章中分析了单租户在不同网络情形下的计算节点的网络结构，但未有描述当数据包到达网络节点时候，数据包是如何走向公网的，网络的结构如下： 通过前一篇文章我们知道，对于该租户的网络来说，相当于计算节点中的虚机实例通过GRE的隧道与网络节点的虚拟路由器打通了二层，逻辑结构就像这样： 那么这个二层究竟是如何相互联系起来的。 看下网络节点的ovs： 当数据包通过GRE tunnel到达br-tun后，br-tun中的 patch-int port与 br-int中的 patch-tun port互联，数据包被送到br-…

实验网络拓扑如下：  首先创建一个L3路由器，并给租户设置三个网络 网络节点情况： [crayon-681cddbdc713d980057483/] 在br-int中，tap*为DHCP的接口， qr为租户的路由器接口，目前只有一个租户，可以看出该L3路由器上有三个网络，实际的网络拓扑结构如下： 此时虚拟路由器上实际有4个接口，可以理解为br-int交换是租户私人网的内部交换机划分了三个独立vlan，每个vlan都有一个接口和虚拟路由器相连。 路由器左边的蓝色网络可以理解为provide网络，路由器通过接入br-e…

Overview Before you install any hardware or software, you must know what you're trying to achieve. This section looks at the basic components of an OpenStack infrastructure and organizes them into one of the more common reference architectures. You'll then use…

Neutron L3 Agent / What is it and how does it work? Neutron has an API extension to allow administrators and tenants to create "routers" that connect to L2 networks. Known as the "neutron-l3-agent", it uses the Linux IP stack and iptables to perform L3 forward…

OpenStack is composed of many different projects. The core projects provide compute, storage, and network resources. The Neutron project provides network resources to the OpenStack environment and can be difficult to get started with. To help get the gears tur…

In this multi-part walkthrough series, I intend to dive into the various components of the OpenStack Neutron project, and to also provide working examples of multiple networking configurations for clouds built with Rackspace Private Cloud powered by OpenStack …

In this multi-part blog series I intend to dive into the various components of the OpenStack Neutron project, and to also provide working examples of networking configurations for clouds built with Rackspace Private Cloud powered by OpenStackon Ubuntu 12.04 LT…

系列一 https://blogs.oracle.com/ronen/entry/diving_into_openstack_network_architecture https://blogs.oracle.com/ronen/entry/diving_into_openstack_network_architecture1 https://blogs.oracle.com/ronen/entry/diving_into_openstack_network_architecture2 https://blogs.…

在三台vmware的虚拟机上模拟安装三节点openstack，网络设计如下，该结构在控制节点上安装nova，glance，keystone，neutron, horizon, 在network节点上安装网络服务相关的各种plugin，计算节点上安装nova计算 在上述网络中，compute的 eth1 和 network的eth1 通过GRE tunnel构成二层互联，DHCP服务运行在network节点上，当一个vm在compute上启动后，dhcp服务可以通过GRE隧道给该vm自动分配IP。 在network节…

1. ubuntu只安装openssh服务，给eth0网卡设置静态IP，不用dhcp 在你的home下，例如我的是/home/mycisco/ 2.apt-get install git 3. git clone https://github.com/openstack-dev/devstack.git 下面耐心等，完毕后，创建如下localrc文件放到/home/mycisco/devstack下   =============================== #替换host IP为你设置的IP […