Prometheus is an open source monitoring solution that collects metrics from the system and its applications. As a developer, you can query these metrics and use them to create alerts, which you can use as a source for dashboards. One example would be using Prometheus metrics with Grafana.
Continue reading Monitoring .NET Core applications on Kubernetes
Apache Kafka is a rock-solid, super-fast, event streaming backbone that is not only for microservices. It’s an enabler for many use cases, including activity tracking, log aggregation, stream processing, change-data capture, Internet of Things (IoT) telemetry, and more.
Red Hat AMQ Streams makes it easy to run and manage Kafka natively on Red Hat OpenShift. AMQ Streams’ upstream project, Strimzi, does the same thing for Kubernetes.
Setting up a Kafka cluster on a developer’s laptop is fast and easy, but in some environments, the client setup is harder. Kafka uses a TCP/IP-based proprietary protocol and has clients available for many different programming languages. Only the JVM client is on Kafka’s main codebase, however.
Continue reading “HTTP-based Kafka messaging with Red Hat AMQ Streams”
Well, it finally happened. Despite the added assurances of working with containers and Kubernetes, the old “It works on my machine” scenario reared its ugly head in my .NET Core (C#) code. The image that I created worked fine on my local PC—a Fedora 32 machine—but it crashed when I tried running it in my Red Hat OpenShift cluster.
The error was “Unable to obtain lock file access on /tmp/NuGetScratch.” Let’s take a quick look at what happened, and then I’ll explain how I fixed it.
After a lot of web searching and a discussion with a Red Hat .NET Core engineer, I discovered the underlying problem. It turns out that within a container, the identity used to initially run the program (using the dotnet run command) must be the same for subsequent users.
The problem might be easy to understand, but what’s the solution?
Continue reading “How to fix .NET Core’s ‘Unable to obtain lock file access’ error on Red Hat OpenShift”
Red Hat OpenShift 4.5 makes it easier than ever to deploy and run event-driven applications that react to real-time information via event notifications. Empowered by OpenShift Serverless, applications come to life through events, scaling up resources as needed (or up to a pre-configured limit), and then scaling back to zero after the resource burst is over.
Continue reading Creating event sources in the OpenShift 4.5 web console
Before we had Spring Boot and similar frameworks, a web app container was the main requirement for deploying Java web applications. We now live in the age of microservices, and many Java applications are developed on top of Quarkus, Thorntail, or Spring Boot. But some use cases still require an old-school web application.
Continue reading Deploy your Java web application into the cloud using Eclipse JKube
Red Hat Advanced Cluster Management (ACM) for Kubernetes offers end-to-end visibility and control for managing your cluster and application lifecycle. Among other features, it ensures security and compliance for your entire Kubernetes domain across multiple data centers and public clouds.
Continue reading Installing Red Hat Advanced Cluster Management (ACM) for Kubernetes
The main goal of Kubernetes is to reach the desired state: to deploy our pods, set up the network, and provide storage. This paradigm extends to Operators, which use custom resources to define the state. When the Operator picks up the custom resource, it will always try to get to the state defined by it. That means that if we modify a resource that is managed by the Operator, it will quickly replace it to match the desired state.
Continue reading Open Data Hub and Kubeflow installation customization
JBoss Tools 4.16.0 and Red Hat CodeReady Studio 12.16 for Eclipse 4.16 (2020-06) are now available. For this release, we focused on improving Quarkus– and container-based development and fixing bugs. We also updated the Hibernate Tools runtime provider and Java Developer Tools (JDT) extensions, which are now compatible with Java 14. Additionally, we made many changes to platform views, dialogs, and toolbars in the user interface (UI).
This article is an overview of what’s new in JBoss Tools 4.16.0 and Red Hat CodeReady Studio 12.16 for Eclipse 4.16 (2020-06).
First, let’s look at how to install these updates. CodeReady Studio (previously Red Hat Developer Studio) comes with everything pre-bundled in its installer. Simply download the installer from the Red Hat CodeReady Studio product page and run it as follows:
Continue reading “New features in Red Hat CodeReady Studio 12.16.0.GA and JBoss Tools 4.16.0.Final for Eclipse 2020-06”
Helm is a popular package manager for Kubernetes that is fully supported on Red Hat OpenShift. Starting with OpenShift 4.5, we’ve made working with Helm charts in the OpenShift web console more intuitive than ever. In this article, we introduce the new features for accessing and managing Helm charts.
Continue reading Advanced Helm support in the OpenShift 4.5 web console
For an enterprise application to succeed, you need many moving parts to work correctly. If one piece breaks, the system must be able to detect the issue and operate without that component until it is repaired. Ideally, all of this should happen automatically. In this article, you will learn how to use health checks to improve application reliability and uptime in Red Hat OpenShift 4.5. If you want to learn more about what’s new and updated in OpenShift 4.5, read What’s new in the OpenShift 4.5 console developer experience.
Continue reading Best practices: Using health checks in the OpenShift 4.5 web console
