Red Hat Enterprise Linux

Red Hat Enterprise Linux 8 developer cheat sheet

Red Hat Enterprise Linux 8 developer cheat sheet

With the release of Red Hat Enterprise Linux 8, I’m pleased to introduce our new RHEL 8 cheat sheet for developers. This version has been updated from the beta version to reflect the final updates in RHEL 8. This document is intended for those of you who are:

  1. Already familiar with Red Hat Enterprise Linux, but you want a quick reference for new RHEL 8 commands.
  2. New to Red Hat Enterprise Linux and want to start exploring RHEL 8.

Here’s a sample of some of the common module commands you’ll find in this cheat sheet. 

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Red Hat Enterprise Linux 8 now generally available

Red Hat Enterprise Linux 8 now generally available

I think Red Hat Enterprise Linux 8 is the most developer-friendly Red Hat Enterprise Linux that we’ve delivered, and I hope you agree. Let’s get down to business, or rather coding, so you can see for yourself. You can read the Red Hat corporate press release.

For this article, I’ll quickly recap Red Hat Enterprise Linux 8 features (architecture, containers), introduce the very new and cool Red Hat Universal Base Image (UBI), and provide a handy list of developer resources to get you started on Red Hat Enterprise Linux 8.

TL;DR

Download RHEL 8 now

Download RHEL 8 image

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Podman basics cheat sheet

Podman basics cheat sheet

Here and elsewhere, we get a lot of questions about post-Docker container tools in Red Hat Enterprise Linux 7.6 and Red Hat Enterprise Linux 8 beta. Tools like podman, buildah, and skopeo enable you to create and manage rootless containers, which are containers that don’t require root access to be built and deployed. To help you master the basics, we’re happy to offer a new podman basics cheat sheet.

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Red Hat Developer Toolset 8.1 Beta now available

Red Hat Developer Toolset 8.1 Beta now available

Red Hat Developer Toolset augments Red Hat Enterprise Linux with the latest, stable versions of GCC that install alongside the original base version. This version of Red Hat Developer Toolset 8.1 Beta includes the following new components:

  • GCC 8.2.1
  • GDB 8.2
  • binutils 2.30
  • elfutils 0.176
  • Valgrind 3.14.0

This Beta release is supported on Red Hat Enterprise Linux 6 and Red Hat Enterprise Linux 7 for AMD64 and Intel 64 architectures. It also supports the following architectures on Red Hat Enterprise Linux 7:  64-bit ARM, big- and little-endian variants of IBM POWER (), and IBM Z. See below for more information about each updated component.

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Red Hat Software Collections 3.3 Beta: New and updated components

Red Hat Software Collections 3.3 Beta: New and updated components

Red Hat Software Collections supply the latest, stable versions of development tools for Red Hat Enterprise Linux via two release trains per year. We are pleased to introduce three new and two updated components in this release, Red Hat Software Collections 3.3 Beta.

The new components are:

  • Ruby 2.6
  • MariaDB 10.3 featuring a new MariaDB Connector for Java
  • Redis 5.0

The updated items include:

  • Two updates to Apache httpd
  • One update to HAProxy

See below for component details.

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Two Red Hat Enterprise Linux 8 labs at Red Hat Summit 2019: Definitive RHEL Beta, Applications Streams

Two Red Hat Enterprise Linux 8 labs at Red Hat Summit 2019: Definitive RHEL Beta, Applications Streams

We’ve had wonderful participation in the Red Hat Enterprise Linux 8 Beta, and if you participated in it, we hope you found the numerous related articles helpful. But whether or not you’ve tried Red Hat Enterprise Linux 8 Beta, if you’re attending Red Hat Summit 2019 next month, here are two hands-on labs you’ll want to participate in.

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Speed up SystemTap script monitoring of system calls

Speed up SystemTap script monitoring of system calls

SystemTap has extensive libraries called tapsets that allow developers to instrument various aspects of the kernel’s operation. SystemTap allows the use of wildcards to instrument multiple locations in particular subsystems.  SystemTap has to perform a significant amount of work to create instrumentation for each of the places being probed.  This overhead is particularly apparent when using the wildcards for the system call tapset that contains hundreds of entries (syscall.* and syscall.*.return). For some subsets of data collection, replacing the wildcard-matched syscall probes in SystemTap scripts with the kernel.trace("sys_enter")  and the kernel.trace("sys_exit") probe will produce smaller instrumentation modules that compile and start up more quickly. In this article, I’ll show a few examples of how this works.

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Red Hat Enterprise Linux 8 Image Builder: Building custom system images

Red Hat Enterprise Linux 8 Image Builder: Building custom system images

Red Hat Enterprise Linux 8 Beta ships a new tool, called Image Builder, that allows you to create custom Red Hat Enterprise Linux system images in a variety of formats. These include compatibility with major cloud providers and virtualization technologies available in the market. As a result, it enables you to quickly spin up new Red Hat Enterprise Linux (RHEL) systems in different platforms, according to your requirements. At this time, Image Builder is available as a Technology Preview Feature.

In this article, we’ll show how to set up Image Builder in Red Hat Enterprise Linux 8 Beta and create a couple of images to test its capabilities. To follow this tutorial, you will need two virtual machines running Red Hat Enterprise Linux 8 Beta. We’ll not cover Red Hat Enterprise Linux 8 Beta installation in this post. For more information, take a look at Get RHEL8 Beta.

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