RHEL

How to install Java 8 an 11 on Red Hat Enterprise Linux 8 Beta

How to install Java 8 an 11 on Red Hat Enterprise Linux 8 Beta

With Red Hat Enterprise Linux (RHEL) 8 Beta, two major versions of Java will be supported: Java 8 and Java 11. In this article, I’ll refer to Java 8 as JDK (Java Development Kit) 8 since we are focusing on the development aspect of using Java. JDK 8 and JDK 11 refer to Red Hat builds of OpenJDK 8 and OpenJDK 11 respectively. Through this article, you’ll learn how to install and run simple Java applications on RHEL 8 Beta, how to switch between two parallel installed major JDK versions via alternatives and how to select one of the two JDKs on a per-application basis.

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Achieving high-performance, low-latency networking with XDP: Part I

Achieving high-performance, low-latency networking with XDP: Part I

XDP: From zero to 14 Mpps

In past years, the kernel community has been using different approaches in the quest for ever-increasing networking performance. While improvements have been measurable in several areas, a new wave of architecture-related security issues and related counter-measures has undone most of the gains, and purely in-kernel solutions for some packet-processing intensive workloads still lag behind the bypass solution, namely Data Plane Development Kit (DPDK), by almost an order of magnitude.

But the kernel community never sleeps (almost literally) and the holy grail of kernel-based networking performance has been found under the name of XDP: the eXpress Data Path. XDP is available in Red Hat Enterprise Linux 8 Beta, which you can download and run now.

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Announcing .NET Core 2.2 for Red Hat Platforms

Announcing .NET Core 2.2 for Red Hat Platforms

We are very excited to announce the general availability of .NET Core 2.2 for Red Hat Enterprise Linux and OpenShift platforms! This general availability is in lock-step with Microsoft’s release yesterday.

.NET Core is the open-source, cross-platform .NET platform for building microservices. .NET Core is designed to provide the best performance at scale for applications that use microservices and containers. Libraries can be shared with other .NET platforms, such as .NET Framework (Windows) and Xamarin (mobile applications). With .NET Core you have the flexibility of building and deploying applications on Red Hat Enterprise Linux or in containers. Your container-based applications and microservices can easily be deployed to your choice of public or private clouds using Red Hat OpenShift. All of the features of OpenShift and Kubernetes for cloud deployments are available to you.

.NET Core 2.2 continues to broaden its support and tools for application development in an open source environment. The latest version of .NET Core includes the following improvements:

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Network debugging with eBPF (RHEL 8 Beta)

Network debugging with eBPF (RHEL 8 Beta)

Introduction

Networks are fun to work with, but often they are also a source of trouble. Network troubleshooting can be difficult, and reproducing the bad behavior that is happening in the field can be painful as well.

Luckily, there are some tools that come to the aid: network namespaces, virtual machines, tc, and netfilter. Simple network setups can be reproduced with network namespaces and veth devices, while more-complex setups require interconnecting virtual machines with a software bridge and using standard networking tools, like iptables or tc, to simulate the bad behavior. If you have an issue with ICMP replies generated because an SSH server is down, iptables -A INPUT -p tcp --dport 22 -j REJECT --reject-with icmp-host-unreachable in the correct namespace or VM can do the trick.

This article describes using eBPF (extended BPF), an extended version of the Berkeley Packet Filter, to troubleshoot complex network issues. eBPF is a fairly new technology and the project is still in an early stage, with documentation and the SDK not yet ready. But that should improve, especially with XDP (eXpress Data Path) being shipped in Red Hat Enterprise Linux 8 Beta, which you can download and run now.

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Managing containerized system services with Podman

Managing containerized system services with Podman

In this article, I discuss containers, but look at them from another angle. We usually refer to containers as the best technology for developing new cloud-native applications and orchestrating them with something like Kubernetes. Looking back at the origins of containers, we’ve mostly forgotten that containers were born for simplifying application distribution on standalone systems.

In this article, we’ll talk about the use of containers as the perfect medium for installing applications and services on a Red Hat Enterprise Linux (RHEL) system. Using containers doesn’t have to be complicated, I’ll show how to run MariaDB, Apache HTTPD, and WordPress in containers, while managing those containers like any other service, through systemd and systemctl.

Additionally, we’ll explore Podman, which Red Hat has developed jointly with the Fedora community. If you don’t know what Podman is yet, see my previous article, Intro to Podman (Red Hat Enterprise Linux 7.6) and Tom Sweeney’s Containers without daemons: Podman and Buildah available in RHEL 7.6 and RHEL 8 Beta.

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What, No Python in RHEL 8 Beta?

What, No Python in RHEL 8 Beta?

TL;DR Of course we have Python! You just need to specify if you want Python 3 or 2 as we didn’t want to set a default. Give yum install python3 and/or yum install python2 a try. Or, if you want to see what we recommend you install yum install @python36 or yum install @python27. Read on for why:

For prior versions of Red Hat Enterprise Linux, and most Linux Distributions, users have been locked to the system version of Python unless they got away from the system’s package manager. While this can be true for a lot of tools (ruby, node, PERL, php) the Python use case is more complicated because so many Linux tools (like yum) rely on Python. In order to improve the experience for RHEL 8 users, we have moved the Python used by the system “off to the side” and we introduced the concept of Application Streams based on Modularity.

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The Non-complexity of /etc/nsswitch.conf

The Non-complexity of /etc/nsswitch.conf

In most glibc-based operating systems, there’s a file /etc/nsswitch.conf that most people ignore, few people understand, but all people generally rely on. This file determines where the system finds things like host names, passwords, and protocol numbers. Does your company use LDAP? NIS? Plain files? The nsswitch file (it stands for “name services switch”) tells the system what service to use for each type of name lookup.

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Support Lifecycle for Clang/LLVM, Go, and Rust

Support Lifecycle for Clang/LLVM, Go, and Rust

On the heels of our recently announcement, General Availability of Clang/LLVM 6.0, Go 1.10, and Rust 1.29, I want to share how we’ll be supporting them going forward. Previously, these packages had been in “Technology Preview” status, which means that they were provided for “you to test functionality and provide feedback during the development process”, and were “not fully supported under Red Hat Subscription Level Agreements, may not be functionally complete, and are not intended for production use”.

So now that we’ve promoted them to fully supported status, what does that mean? In the simplest terms, General Availability (GA) means that these packages have officially entered the “Full Support Phase” of their lifecycle:

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Red Hat Enterprise Linux 8 Beta is here

Red Hat Enterprise Linux 8 Beta is here

Red Hat Enterprise Linux 8 Beta is here

And it’s been built with production stability and development agility in mind.

There’s so much to say about RHEL 8 Beta, but I want to focus on just a few points from the corporate announcement that highlight Red Hat Enterprise Linux 8 Beta as a developer platform that:

  • Simplifies application development – with less setup and config effort, you can more quickly get to writing code
  • Is the easiest RHEL yet for developers that are new to Linux
  • Is for traditional and cloud/container applications with many new tools for both
  • Already delivers dozens of tools to build and test applications

Now let’s zoom in on what these mean.

Download the RHEL 8 Beta here. 

“Too slow, too fast”

We’ve gotten this feedback a lot when discussing availability and support of development packages. To address this dichotomy, Red Hat Enterprise Linux 8 Beta has built in the concept of Application Streams to deliver userspace packages (programming languages, compilers, databases, etc.) more simply and with greater flexibility – this addresses the “too slow”.  For the “too fast” requirement, there are also “Core” components that have the same lifecycle as the operating system – 10 years. Users will often have a version in each grouping. Application Streams – think of them as “son of Software Collections” – are a simpler way to deliver this modularity with improved installation, use, and re-use

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Python in RHEL 8

Python in RHEL 8

Ten years ago, the developers of the Python programming language decided to clean things up and release a backwards-incompatible version, Python 3. They initially underestimated the impact of the changes, and the popularity of the language. Still, in the last decade, the vast majority of community projects has migrated to the new version, and major projects are now dropping support for Python 2.

In Red Hat Enterprise Linux 8, Python 3.6 is the default. But Python 2 remains available in RHEL 8.

Using Python in RHEL 8

To install Python, type yum install python3.

To run Python, type python3.

If that doesn’t work for you, or you need more details, read on!

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