In the previous post, we have installed Keystone and provided an overview of its functionality. Today, we will dive in detail into a typical authorization handshake and take you through the Keystone source code to see how it works under the hood. The overall workflow Let us first take a look at the overall process … Continue reading OpenStack Keystone – a deep-dive into tokens and policies
So far, we have used Ansible inventories more or less as a simple list of nodes. But there is much more you can do with inventories - you can assign hosts to groups, build hierarchies of groups, use dynamic inventories and assign variables. In this post, we will look at some of these options. Groups … Continue reading Automating provisioning with Ansible – working with inventories
Most of us probably started to use Python as a scripting language to quickly create working code for e.g. numerical and scientific calculations. But, of course, Python is much more than that. If you intend to use Python for more traditional applications, you will sooner or later need to interface with a database. Today, we … Continue reading Database programming with Python
In one of the previous posts, we have learned how to expose arbitrary ports to the outside world using services and load balancers. However, we also found that this is not very efficient - in the worst case, the number of load balancers we need equals the number of services. Specifically for HTTP/HTTPS traffic, there … Continue reading Managing traffic with Kubernetes ingress controllers
Quantum states are in many ways different from information stored in classical systems - quantum states cannot be cloned and quantum information cannot be erased. However, it turns out that quantum information can be transmitted and replicated by combining a quantum channel and a classical channel - a process known as quantum teleportation. Bell states … Continue reading Quantum teleportation
In my previous post, we have seen how we can use Kubernetes deployment objects to bring up a given number of pods running our Docker images in a cluster. However, most of the time, a pod by itself will not be able to operate - we need to connect it with other pods and the … Continue reading Kubernetes services and load balancers
In the last post, we have seen how Python can be used to control the generation of an EKS cluster. However, an EKS cluster without any worker nodes - and hence without the ability to start pods and services - is of very limited use. Today, we therefore take a look at the process of … Continue reading Python up an EKS cluster – part II
When you want to try out Kubernetes, you have several choices. You can install Kubernetes in a cluster, install it locally using Minikube, or use one of the Kubernets offerings of the major cloud providers like AWS, GCP or Azure. In this post, we set up a Kubernetes cluster on Amazons EKS platform. As I … Continue reading Python up an EKS cluster – part I
After all the work done in the previous posts, we are now ready to actually implement Shor's factoring algorithm on a real quantum computer, using once more IBMs Q Experience and the Qiskit framework. First, recall that Shor's algorithm is designed to factor an integer M, with the restriction that M is supposed to be … Continue reading Factoring integers on a quantum computer with Qiskit
The quantum Fourier transform is a key building block of many quantum algorithms, from Shor's factoring algorithm over matrix inversion to quantum phase estimation and simulations. Time to see how this can be implemented with Qiskit. Recall that the quantum Fourier transform (or, depending on conventions, its inverse) is given by $latex |x \rangle \mapsto … Continue reading Implementing the quantum Fourier transform with Qiskit
