DevOps and Development

Prometheus is an open-source event monitoring software for high-volume distributed applications. While it is a stand-alone application, using it together with a visualization dashboard such as Grafana helps maintain a better overview of the situation. This tutorial will show you how to install Grafana in your Kubernetes cluster and connect it to a Prometheus installation.

Java is a programming language used to develop a wide variety of applications. It is supported by virtually all operating systems, including Fedora.
In this step-by-step tutorial, we take you through the process of installing OpenJDK and Oracle's Java SE on Fedora.

Applications deployed through Kubernetes often require access to databases, services, and other resources located externally, so they need a way to securely store sensitive data. Secrets help organize and distribute sensitive information across a cluster. This tutorial explains what secrets are and how to use them.

Every programming language has their own set of built-in data types. In Python, data types provide information about a variable and what operations it supports. Learn about each data type in Python through examples.

Helm is a package manager that features all the necessary commands for easy app management in a Kubernetes cluster. This tutorial covers all the important Helm operations and provides examples to help you learn its syntax and features.

Learn how Spark Streaming enriches the Spark API for large scale data streaming and processing with a step-by-step example of streaming Twitter data in Python.

There are several methods for deploying Elasticsearch and the rest of the ELK stack on Kubernetes. Using Helm and helm charts is the most straightforward one. This tutorial lists steps to install Elasticsearch, Kibana, and Metricbeat in Kubernetes using a helm chart template.

Thanks to Spark's DataFrame API, we can quickly parse large amounts of data in structured manner. DataFrame API is available for Java, Python or Scala and accepts SQL queries.

Testing Web UI clients whose API backend runs in a local Kubernetes cluster requires HTTPS access. This tutorial explains how to obtain HTTPS access by generating a self-signed certificate using cert-manager, CFSSL, Easy-RSA, and OpenSSL methods.

This step-by-step tutorial teaches you how to delete a Helm deployment from a specific namespace and how to remove a Kubernetes cluster namespace.