In this article, we will use a Python-based messaging client to connect and subscribe to a topic with a durable subscription in the Apache ActiveMQ Artemis broker. We will use the text-based STOMP protocol to connect and subscribe to the broker. STOMP clients can communicate with any STOMP message broker to provide messaging interoperability among many languages, platforms, and brokers.
If you need to brush up on the difference between persistence and durability in messaging, check Mary Cochran’s article on developers.redhat.com/blog.
A similar process can be used with Red Hat AMQ 7. The broker in Red Hat AMQ 7 is based on the Apache ActiveMQ Artemis project. See the overview on developers.redhat.com for more information.
Continue reading “Using the STOMP Protocol with Apache ActiveMQ Artemis Broker”
I recently got my zero-dollar developer copy of Red Hat Enterprise Linux (RHEL, version 7.5) and built a virtual machine (VM) to run it. There it was, on my PC, running in VirtualBox…a gleaming, shiny, brand-spanking-new VM running RHEL. Whatever shall I do with it?
Then I got the idea: I’ll install the Red Hat Container Development Kit (CDK) and build some Python-based containers. I’ll use Flask, a terrific microframework that makes building RESTful services easy.
Continue reading “How to install Python Flask on Red Hat Enterprise Linux 7”
There has been a need for a simple, easy-to-use handler for writing tests and other code around containers that would implement helpful methods and utilities. For this we introduce conu, a low-level Python library.
This project has been driven from the start by the requirements of container maintainers and testers. In addition to basic image and container management methods, it provides other often used functions, such as container mount, shortcut methods for getting an IP address, exposed ports, logs, name, image extending using source-to-image, and many others.
Continue reading “Introducing conu – Scripting Containers Made Easier”
APIs are critical to automation, integration and developing cloud-native applications, and it’s vital they can be scaled to meet the demands of your user-base. In this article, we’ll create a database-backed REST API based on the Python Falcon framework using Red Hat Software Collections (RHSCL), test how it performs, and scale-out in response to a growing user-base.
Continue reading Create a scalable REST API with Falcon and RHSCL
Rust is a systems programming language that runs blazingly fast, prevents segfaults, and guarantees thread safety.
Continue reading Speed up your Python using Rust
GDB has evolved in the last several years to provide a Python API. This series of articles will look at how a user can program GDB with the API and will also take an in-depth look at several features of that API. But, before we begin, a small history lesson is needed and a look at just why an API was needed.
Continue reading “The GDB Python API”
I am pleased to announce the general availability of numerous Red Hat curated collections of the latest, stable application development tools, languages, compilers, databases, and more. Created for Red Hat Enterprise Linux, developers can access these via the following open source offerings:
- Red Hat Software Collections
- Red Hat Developer Toolset
- New RHEL Compilers: Clang/LLVM, Go, and Rust
Components delivered as Linux Containers can also be used on Red Hat OpenShift Container Platform.
Continue reading “Announcing release of Software Collections, Developer Toolset, new compilers”
In an environment where OpenStack instances are automatically subscribed to Satellite, it is important that Satellite is notified of terminated instances so that is can safely delete its host record. Not doing so will:
- Exhaust the available subscriptions, leading to unsubscribed hosts not being able to apply updates and security errata.
- In the event that an emergency security errata needs to be deployed across the organization, Satellite administrators would be unable to determine if a host was either off or terminated, leading to uncertainty with their security posture.
In smaller environments, where one team is responsible for both OSP and Satellite, it’s possible to have one system administrator do this by using their administrator level access across both systems to determine which host records can be safely deleted in Satellite when the corresponding instance no longer exists.
Continue reading “Using Falcon to cleanup Satellite host records that belong to terminated OSP instances”
I am pleased to announce the immediate availability of Red Hat Software Collections 3.0 Beta, Red Hat’s newest installment of open source development tools, dynamic languages, databases, and more. Delivered on a separate lifecycle from Red Hat Enterprise Linux with a more frequent release cadence, Red Hat Software Collections bridges development agility and production stability by helping you create modern applications that can be confidently deployed into production. Most of these components are also available in Linux container image format to streamline microservices development.
In addition to these new components having traditional support for x86_64, Red Hat Software Collection 3.0 Beta adds support for three new architectures: s390x, aarch64, and ppc64le.
NEW ADDITIONS to Red Hat Software Collections 3.0 Beta include:
Continue reading “Red Hat updates Python, PHP, Node.js, more; supports new arches”
With nowadays virtualization technologies, low latency communications, CPU Power and The Cloud, the Infrastructure paradigm is being changed from the static old-fashion way of managing servers to a new standard automation way of deploying services.
Continue reading “Documentation as Code”