RHEL

Wait... what? I was involved in diagnosing a production system performance problem: a web application serving thousands of interactive users was acting up. Symptoms included significant time running kernel code on behalf of the application (unexpectedly), and at those times substantial delays were observed by end users. As someone with a systems programming background, I figured I had a decent shot at figuring this one out. Naively I reached for strace(1), the system call and signal tracer, to provide insights...

The charter of Open Innovation Labs is to help our customers accelerate application development and realize the latest advancements in software delivery, by providing skills, mentoring, and tools. Some of the challenges I frequently hear from customers are those around Platform as a Service (PaaS) environment provisioning and configuration. This article is first in the series of articles that guide you through installation configuration and usage of the Red Hat OpenShift Container Platform (OCP) on Amazon Web Services (AWS). This...

Red Hat Software Collections can make your life as a programmer or admin immensely easier. Like death, taxes and zombies, dealing with different versions of software is something you just can't avoid. It's a nasty but necessary fact of life. Traditionally, when developers and system admins grapple with this issue, they have to sacrifice something. If you want to run the latest and greatest version of a web app, it might not support users with outdated browsers. If you install...

Editor's Note: If you have a Linux system that runs KVM and would like to try Red Hat Enterprise Linux on KVM, follow our KVM Get started guide, https://developers.redhat.com/products/rhel/getting-started The kernel-based Virtual Machine (KVM) is a virtualization infrastructure many have become familiar with throughout the industry. This article will guide you through getting a basic KVM hypervisor up and running and ready for use. In order to fully utilize the KVM, you will need a CPU that has virtualization extensions...

Situation: You’re a great software developer and a fearless leader. Your CEO bursts into your cubicle and he is giving you vast amounts of investment capital, no data center, and limited staff. Your task: build a multi-region, highly available presence in AWS (or your favorite cloud provider) that can be maintained by minimal man-power. Your multi-tier Java EE app is almost ready. You are going to be required to create, maintain, and monitor a large amount of servers, RDS instances...

Service Bus is, according to Microsoft, “...a generic, cloud-based messaging system for connecting just about anything.” Most commonly used as an Azure service, it can be an excellent tool for managing non-critical workloads within an application and offers the benefit of being AMQP compatible when compared to Amazon’s SQS. Connecting to Service Bus (SB) on Windows is simple, but will the new .NET Core (DNX) platform be capable of the task? Library Adventures As of the writing of this post...

This post may be short, but if you're new to .NET Core, it's valuable. After installing .NET on RHEL, you want to get up and running as quickly as possible. After all, what good is a framework without anything to show for it? Well, fearless developer, wait no more; here are a few dotnet commands that will take you from a command prompt to a web site, and beyond: By now, you might know this basic command to create a...

JBoss EAP 7 was recently released, and brings with it a whole host of new features and support, such as support for Java EE 7, Undertow (a highly scalable web server), reduced port usage, graceful shutdown, improved GUI and CLI management, and much more. Go ahead and download it, unzip, and run bin/standalone.sh and check out all these great features. What's that? It didn't work? Did you check that your JRE is compatible? Are there outstanding incompatibility or security issues...

Kubernetes is a great tool for container orchestration on a server cluster. It makes it easy to deploy lots of containers in a resource-efficient way using a simple interface. But one thing that is not easy to do with Kubernetes is to deploy it locally. Kubernetes is designed to run on an actual cluster, which means using it only on a single computer is tough. I know. You're probably wondering why you'd want to use Kubernetes locally in the first...

Sometimes, software just goes together. Linux, the Apache Web server, MySQL, and PHP, the four ingredients of the LAMP stack, which revolutionized data centers and made open source a big deal two decades ago, are probably the most famous example. But there are lots of others. Here's another open source software stack you should know about in our present age of cloud and big data: the Elastic Stack, or ELK. Based on Elasticsearch, Logstash and Kibana, ELK is a fully...

Red Hat Linux was the first version of Linux I ever used. Until succumbing to The Cult of Macintosh a few years ago, I was a faithful Red Hat (and later Fedora) junkie. Hell, I still have my 15 year old Red Hat 7.2 discs. But, as a developer, it has been tough to do any substantial work with Red Hat Enterprise Linux (RHEL) unless working for an organization that has a license. That is, until relatively recently, when Red...

In my first .NET core post, I set out on a journey to conquer the new world of .NET Core (formerly DNX) on Red Hat Enterprise Linux (RHEL). In my ignorance I believed I would do a short post on firing up RHEL, installing .NET Core, and then converting an application from .NET to .NET Core before adding it as a build job to a new TeamCity instance. The best laid plans seem to be the ones that get me...

Despite spending plenty of time in Red Hat Linux while I was young, I have become an unabashed Windows environment super-user/programmer. Still, it’s hard to discount the multitude of ways that the *nix community stands ahead and alone, so when Microsoft and Red Hat announced their partnership to bring .NET to Linux, I had no choice but to take notice. As an experiment, I am going to go through setting up Red Hat Enterprise Linux (RHEL) and .NET Core to...

Ready to develop container application in just over 4 minutes? Since I started playing around with OpenShift in its various forms, such as Online with cartridges and then later as containerized images, nothing has gotten me more excited than the availability of the Red Hat Container Development Kit (CDK). This kit has made it possible to easily gain access to a full, product based installation of OpenShift as you would interact with it in application development in just minutes. While...

Red Hat is committed to making .NET a First Class citizen on Red Hat Enterprise Linux (RHEL). To that end, we're working furiously to make sure everything's perfect before we make .NET available by simply running: yum install rh-dotnetcore10 In the meantime, I can't wait. No, literally, I can't wait --- you don't need to either. You can hop over to Microsoft's .NET download site and get .NET for RHEL. (What? You didn't get your zero-dollar developer copy of RHEL...

This is the second installment in a series about using Red Hat Identity Management (IdM) on Red Hat Enterprise Linux and Fedora (using the upstream FreeIPA project). As described in part 1, IdM makes it very easy to build an enterprise-grade identity management solution, including a full enterprise PKI solution providing complete x509 certificate life cycle management. Most organizations start with a simple self-signed Certificate Authority (CA) certificate, perhaps generated using OpenSSL; with a little configuration and a few commands...

How would you like a development environment on Red Hat Enterprise Linux (RHEL) set up in less than a minute? Having multiple versions of software installed at the same time? Is there a simpler and faster way than manually searching for and then installing separate packages? The answer to all three questions is: Red Hat Software Collections (RHSCL). This technology has been around for a few years, but not everyone is familiar with it. This article reveals its potential and...

NGINX is a powerful web server that can easily handle high volumes of HTTP traffic. Each time NGINX handles a connection, a log entry is generated to store some information this connection like remote IP address, response size and status code, etc. The complete set of logged information with more details can be found here. In some cases, you may be more interested in storing the body of requests, specifically POST requests. Lucky, the NGINX ecosystem is rich, and includes...

Red Hat has always given operations teams value in deploying Red Hat Enterprise Linux (RHEL), and that's no different in a containerized world. But, as a developer, why should I build on RHEL? Does the underlying operating system really affect me? It might if you want to: get your app to production faster work on new products, not maintain old ones avoid compatibility issues at scale (And yes RHEL is available at no cost for development use.) 1) Take Your...

With the advent of .NET Core 1.0, things have changed. Dramatically. For starters, it's open source. This means anyone, including you and I, can submit bug fixes and enhancements to the .NET framework. It will now run on Mac and Linux. You can compile code natively to the platform of your choice. And beyond that, it's much more modular. There's the Common Language Runtime (CLR), the CoreFX (where the "System." libraries live), the Command Line Interface (CLI), and other modules...

I'm a .NET developer at heart, and I want to write C# code that runs natively in Linux - Red Hat Enterprise Linux (RHEL), to be specific. So, I hopped over to the Red Hat .NET Developers web site, installed the CDK and was up and running in short order. I had a no-cost developer's copy of RHEL running on my PC and was writing .NET code. Life was good. I had my instance of RHEL inside a Vagrant Box...

Red Hat Developer Toolset has already been available for nearly four years and Red Hat Software Collections has been out for two and a half. We've seen excellent adoption of these as more and more developers and customers utilize the newer technologies that become available. So, this week we announced more with these two new beta releases. New news Red Hat Software Collections 2.2 Beta includes: new open source databases (MariaDB 10.1, MongoDB 3.2 and PostgreSQL 9.5) new open source...

Before and after Fedora releases, there are updates that keep coming in to fix bugs or add minor features to packages included in Fedora. To ensure that these are stable and don't affect the performance of the existing system, we do "update testing". Once testing is complete, we share our results and make sure that the developer is aware about the bugs and the success rate of the package. This article will explain how to participate in update testing and...

In the world of containers, there is a desperate need to be able to scan container images for known vulnerabilities and configuration problems, and as we proliferate containers and bundled applications into the enterprise, many groups and companies have started to build container scanning tools. Even Red Hat has been building a scanning tool based on the tried and true OpenSCAP project, but there were several problems we saw time and again. The problems with existing container scanning tools included...

Much has changed in the IT world in the last few years, first Microsoft Loves Linux and now Red Hat Loves .NET. I suspect for many of you it is a bit bewildering, however, there are huge wins here for software developers. C# is rapidly becoming the programming language with the greatest number of target platforms, including: iOS, Android, OSX, and now through the partnership with Red Hat (home of the worlds' most popular enterprise Linux platform) C# is becoming...