Welcome back! Unlike other posts in this blog, used to advertise my own achievements in OpenStack (really?, how you dare), this post will help you to understand how can you connect one virtual machine to two external networks. Of course, avoiding the direct approach of directly creating two ports on each network. No, let’s do […]
Today’s post is… a bit dense, I will admit. And to make things a bit more complex, I’m going to talk about the external ports too but for a reason. Actually this post comes from a bug (no way!) that claims that the external ports are usually bound to chassis different to the router gateway […]
How long have you been waiting when the DHCP agent service was restarted? If you raised your hand and shouted “too long!”, this is your post. OpenStack Neutron DHCP agent. From the Red Hat OSP16 documentation, “the OpenStack Networking DHCP agent manages the network namespaces that are spawned for each project network to act as […]
Some months ago I implemented a new Neutron’s quota driver. The aim of this new driver, as described in the Launchpad bug 1926787 and Bugzilla bug 1955661, was to avoid the permanent database lock contention status generated when using the Neutron’s quota engine. Why that was happening? Follow me… What do we need to count? […]
Let’s start this new post entry in “professor” mode, doing a statement: “AMQP is the messaging technology chosen by the OpenStack cloud“. This link refers to Nova but is valid for any other OpenStack project. AMQP is used to facilitate the inter process communication. For example, if the Neutron DHCP agent needs to retrieve some […]
Welcome back! I just finished my lethargic aestival period, emerging from the swimming pool like a manatee. Back to the (awaited) office routine, I had a clash with Keepalived; actually with around four hundred instances. Yes, 400 instances spawned to control the same number of high availability routers in OpenStack. The OpenStack L3 agent is […]
The first thing you will notice reviewing the code of this library is a common pattern: Terry Wilson, one of the fathers of the creature. It has many other contributors, but he is the main maintainer. Thanks! This library provides a Python native implementation to access to the Open vSwitch database, using the OVSDB management […]
Openstack can be deployed in several ways. For example, for testing and development, devstack is used. For production environments, Kolla-Ansible provides a set of tools to define, create and deploy a set of containers running the needed services. TripleO is another deployment tool that can be configured to run the services on containers. Neutron, the […]
Welcome to the exciting world of databases! At least for the project in OpenStack I know best, which is Neutron. Neutron, and if I’m not wrong all the OpenStack projects, use SQLAlchemy as ORM library. Here you can read how this ORM was introduced in OpenStack to be the only API to talk to the […]
Some time ago I created a timer class for Neutron. This class was a context manager with a defined timeout. This timeout was implemented using the Linux alarm clock. Once the clock finishes the countdown, sends an alarm signal to the calling process. The problem of this implementation is that is not possible to use […]