OpenStack Cinder foundations – storage networks, iSCSI, LUNs and all that

To understand Cinder, the block device component of OpenStack, you will need to be familiar with some terms that originate from the world of data center networks like SCSI, SAN, LUN and so forth. In this post, we will take a short look at these topics to be prepared for our upcoming installation and configuration … Continue reading OpenStack Cinder foundations – storage networks, iSCSI, LUNs and all that

OpenStack Neutron – handling instance metadata

Not all cloud instances are born equal. When a cloud instance boots, it is usually necessary to customize the instance to some extent, for instance by adding specific SSH keys or by running startup scripts. Most cloud platforms offer a mechanism called instance metadata, and the implementation of this feature in OpenStack is our topic … Continue reading OpenStack Neutron – handling instance metadata

OpenStack Neutron – DHCP and DNS

In a cloud environment, a virtual instance typically uses a DHCP server to receive its assigned IP address and DNS services to resolve IP addresses. In this post, we will look at how these services are realized in our OpenStack playground environment. DHCP basics To understand what follows, it is helpful to quickly recap the … Continue reading OpenStack Neutron – DHCP and DNS

OpenStack Neutron – building virtual routers

In a previous post, we have set up an environment with a flat network (connected to the outside world, in this case to our lab host). In a typical environment, such a network is combined with several internal virtual networks, connected by a router. Today, we will see how an OpenStack router can be used … Continue reading OpenStack Neutron – building virtual routers

OpenStack Neutron – running Neutron with a separate network node

So far, our OpenStack control plane setup was rather simple - we had a couple of compute nodes, and all other services were running on the same controller node. In practice, this does not only create a single point of failure, but also a fairly high traffic on the network interfaces. In this post, we … Continue reading OpenStack Neutron – running Neutron with a separate network node

OpenStack Neutron – building VXLAN overlay networks with OVS

In this post, we will learn how to set up VXLAN overlay networks as tenant networks in Neutron and explore the resulting configuration on our compute nodes. Tenant networks The networks that we have used so far have been provider networks - they have been created by an administrator, specifying the link to the physical … Continue reading OpenStack Neutron – building VXLAN overlay networks with OVS

OpenStack Neutron – deep dive into flat and VLAN networks

Having installed Neutron in my last post, we will now analyze flat networks and VLAN networks in detail and see how Neutron actually realizes virtual Ethernet networks. This will also provide the basic understanding that we need for more complex network types in future posts. Setup To follow this post, I recommend to repeat the … Continue reading OpenStack Neutron – deep dive into flat and VLAN networks

OpenStack Neutron installation – basic setup and our first instances

In this post, we will go through the installation of Neutron for flat networks and get to know the basic configuration options for the various Neutron components, thus completing our first fully working OpenStack installation. If you have not already read my previous post describing some of the key concepts behind Neutron, I advise you … Continue reading OpenStack Neutron installation – basic setup and our first instances

OpenStack Neutron – architecture and overview

In this post, which is part of our series on OpenStack, we will start to investigate OpenStack Neutron - the OpenStack component which provides virtual networking services. Network types and some terms Before getting into the actual Neutron architecture, let us try to understand how Neutron provides virtual networking capabilities to compute instances. First, it … Continue reading OpenStack Neutron – architecture and overview