One of the most popular networking command in Linux is the ifconfig command. It lets you see (and configure) IP address for network interface. It also shows the MAC address for each interface. The MAC address and the IP address viewing is probably the most common reason for using the ifconfig command. In addition the ifconfig command works with physical network interface (like eth0..) and virtual network interface (like Tap interface etc).
My first publication OpenStack Networking Cookbook is now available for purchase. It is available as a printed book as well as e-book. OpenStack is a rapidly evolving cloud platform and Networking (Neutron) is one of its critical components. The current trends of SDN and NFV make OpenStack Networking even more exciting and complex. I have co-authored the book with a colleague and the overall experience of writing a book was very satisfying.
OpenStack supports rich abstractions to handle virtual networking needs in a cloud. As a user the most visible entities are the Network, Subnets, Routers, Firewall etc. But if we consider ingress and egress points for data traffic, the most critical entity is the Port. OpenStack Neutron Ports are usually created automatically as part of other user operations. However the CLI allows users to create Ports independently as well.
The best way to learn OpenStack is by installing, running and playing with it directly. In this blog, I will share the details of the VirtualBox based multi-node OpenStack installation. I will be focusing only on the networking aspects when using VirtualBox. I will also share some tips that are important in this deployment. This blog will not cover the steps to install and create a virtual machine using VirtualBox.
I briefly talked about OpenStack Neutron plugins and agents in my blog about OpenStack Neutron components. In this blog, let us go a step further and understand the roles of plugins and the agents.
In an earlier blog, I have talked about Linux bridge based virtual networking. Recently as part of a comment on my blog, I learnt how to view and interpret the MAC table of Linux bridge. In this installment of WILT (What I Learnt Today) series, I will share how MAC Table can be used for troubleshooting Linux bridges.
Neutron is the networking project within the OpenStack cloud platform. The purpose of OpenStack Neutron is to provide physical and virtual network resources to the instances (or virtual machines). Before you continue to read this article I would recommend that you read about OpenStack networking concepts. To appreciate the architecture and the functionality of Neutron, it is important to understand the components that are part of Neutron.
In the next installment of “What I learnt today” or WILT, I briefly touch upon Network Namespace. I came across Namespace as part of my ongoing study of OpenStack networking. Namespaces are powerful constructs in Linux that allows you to create a copy of the TCP/IP network stack -all the way from the Ethernet interfaces (L2), routing tables etc.