Containers Archives - Red Hat Developer

Load balancing Red Hat JBoss Enterprise Application Platform subclusters with mod_cluster

By Pandurang Memane July 15, 2020July 13, 2020

This article introduces a way to build and manage clustered environments using subclusters in a domain-mode installation of Red Hat JBoss Enterprise Application Platform (JBoss EAP). I assume that readers are familiar with JBoss EAP and the Apache HTTP Server (HTTPD) mod_cluster module. I introduce the load balancing group configuration for that module.

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Developing and testing on production with Kubernetes and Istio Workspace

By Bartosz Majsak July 14, 2020July 14, 2020

Due to container-orchestration platforms like Kubernetes and Red Hat OpenShift, developers have become very efficient about deploying and managing distributed and containerized applications. But can we say the same about application development and testing?

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Install Apache Tomcat and deploy a Java web application on Red Hat OpenShift

By Pandurang Memane July 1, 2020June 26, 2020

If you are new to OpenShift, then you might want to install Apache Tomcat on top of it for simpler experimentation. This article guides you through installing Apache Tomcat from a Docker image and then using it to deploy a Java web app on Red Hat OpenShift. I also show you how to access the Tomcat management console on OpenShift.

To follow the examples, you must have an OpenShift account. We will use the OpenShift command-line interface (CLI) for this demonstration, so be sure to install the CLI (oc) before you begin.

A note about the sample application: You will need a Java web application to use for the deployment example. I am using the Sample Java Web Application from the OpenShift Demos GitHub repository. It is a simple application that is useful for understanding basic concepts. You may use the provided sample or choose your own application to work with.

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Introducing the Red Hat build of the OpenJDK Universal Base Images—now in Red Hat Enterprise Linux 8.2

By Ezequiel Aguilar and Jonathan Dowland June 25, 2020June 25, 2020

With the recent release of Red Hat Enterprise Linux 8.2, we also added the first Red Hat build of OpenJDK Universal Base Images. These General Availability (GA) images for OpenJDK 8 and OpenJDK 11 set a new baseline for anyone who wants to develop Java applications that run inside containers in a secure, stable, and tested manner.

In this article, we introduce the new OpenJDK Universal Base Images and explain their benefits for Java developers. Before we do that, let’s quickly review what we know about UBIs in general.

About Universal Base Images

Red Hat Universal Base Images (UBIs) are:

OCI-compliant container base operating system images with complementary runtime languages and packages that are freely redistributable. Like previous base images, they are built from portions of Red Hat Enterprise Linux (RHEL). UBI images can be obtained from the Red Hat container catalog and be built and deployed anywhere.

In other words, UBIs help application developers reach the secure, stable, and portable world of containers. These images are accessible using well-known tools like Podman/Buildah and Docker. Red Hat Universal Base Images also allow users to build and distribute their own applications on top of enterprise-quality bits that are supportable on Red Hat OpenShift and Red Hat Enterprise Linux.

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Debugging GraalVM-native images using gdb

By Andrew Dinn June 25, 2020June 25, 2020

The GraalVM project includes, amongst other capabilities, a component called GraalVM Native Image. GraalVM Native Image supports the delivery of Java applications as shrink-wrapped, self-contained, standalone executables, commonly referred to as Java-native images. Native images often have a smaller footprint and faster startup time compared to running the same application in the traditional way on the JVM. This is often a win for short-running applications or small, container-based services. The trade-off is usually lower peak performance for long-running programs, and higher garbage collection overheads and latencies for programs with large amounts of resident data.

We are especially interested in GraalVM-native images as an alternative back-end delivery option for applications based on Quarkus. The Java team has worked hard to ensure that Quarkus is well integrated with GraalVM Native Images. In the process, they have found that one important usability issue is the ability to debug the delivered native image.

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What enterprise developers need to know about security and compliance

By Daniel Domkowski and jlien June 23, 2020June 24, 2020

One of the luxuries of my job is that I get to speak to and work with a range of IT people employed by U.S. federal and state government agencies. That range includes DevOps engineers, developers, sysadmins, database administrators, and security professionals. Everyone I talk to, even security professionals, says that IT security and compliance can be imprecise, subjective, overwhelming, and variable—especially in the federal government.

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A development roadmap for Open Data Hub

By Václav Pavlín June 22, 2020June 25, 2020

Open Data Hub (ODH) is a blueprint for building an AI-as-a-Service (AIaaS) platform on Red Hat’s Kubernetes-based OpenShift 4.x. The Open Data Hub team recently released Open Data Hub 0.6.0, followed up by a smaller update of Open Data Hub 0.6.1.

We recently got together and discussed our plans and timeline for the next two releases. Our plans are based on the roadmap slide deck that we put together and presented during the Open Data Hub community meeting on April 6.

In this article, we present our roadmap for the next several Open Data Hub releases. We would like to emphasize that the target dates are optimistic, describing what we would like to achieve. With the current state of the world and vacation time coming up, these dates might change.

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Red Hat JBoss Enterprise Application Platform expansion pack 1.0 released

By James Falkner June 17, 2020June 25, 2020

Red Hat recently released the first Red Hat JBoss Enterprise Application Platform expansion pack (JBoss EAP XP) version 1.0. This version enables JBoss EAP developers to build Java microservices using Eclipse MicroProfile 3.3 APIs while continuing to also support Jakarta EE 8. This article goes into detail on the nature of this new offering and an easy way to get started.

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Enable Eclipse MicroProfile applications on Red Hat JBoss Enterprise Application Platform 7.3

By Emmanuel Hugonnet June 16, 2020June 25, 2020

In this article, we show you how to install Red Hat JBoss Enterprise Application Platform (JBoss EAP) XP 1.0.0.GA and enable Eclipse MicroProfile support on JBoss EAP. Once you have MicroProfile support enabled, you can start using the quickstart examples or start developing your own application.

You can find a demo video at the end of this article.

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Jakarta EE: Multitenancy with JPA on WildFly, Part 1

By Rhuan Rocha June 15, 2020June 25, 2020

In this two-part series, I demonstrate two approaches to multitenancy with the Jakarta Persistence API (JPA) running on WildFly. In the first half of this series, you will learn how to implement multitenancy using a database. In the second half, I will introduce you to multitenancy using a schema. I based both examples on JPA and Hibernate.

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