Red Hat Enterprise Linux

We recently announced that we've made available a set of Dockerfiles for Red Hat Software Collections. We are making these available since we think they may be useful to customers looking to build more complex application containers on top of RHEL and RHSCL. We don't intend the Dockerfiles to produce useful standalone images which you'll immediately put in production - the Docker images which these create are very simple containers which give you RHEL plus the basic set of packages...

Introduction Since their 4.8 version, the C and C++ compilers of the GNU Co mpiler Collection are equipped with built-in memory and data race errors detectors named Address Sanitizer and Thread Sanitizer. This article intends to quickly walk you through the highlights of these two interesting tools. Spotting common memory access errors ... When instructed to compile a given program, the Address Sanitizer sub-system of GCC emits additional code to instruments the memory accesses performed during the program's execution. Later...

It’s been one week since we announced the beta for Red Hat Enterprise Linux 7 Atomic Host and we’re looking for your feedback. If you’ve downloaded and installed the beta, this is your chance to tell us what you think, and what you’d like to see in the product moving forward. TechValidate is conducting a short, 5-minute survey on behalf of Red Hat. Why should you participate? And there's a $500 prize drawing Provide direct, valuable feedback to Red Hat...

At Red Hat Summit 2014, we announced our plans around application containers, including the upstream Project Atomic and our intent to develop a small footprint, container host based on Red Hat Enterprise Linux. Today, we are pleased to announce the availability of the first public beta of Red Hat Enterprise Linux 7 Atomic Host. The beta is available from Red Hat and on Amazon Web Services and Google Compute Platform. Increasingly, business applications are being constructed, not as a monolithic...

Red Hat today announced the general availability of Red Hat Software Collections 1.2, delivering the latest, stable versions of essential development tools, dynamic languages, open source databases, and web servers all on a separate lifecycle from Red Hat Enterprise Linux. The third installment of Red Hat Software Collections now includes vital open developer tools, such as GCC 4.9, Maven and Git, and, for the first time, makes the Eclipse IDE available on Red Hat Enterprise Linux 7. In addition, Red...

In this prior post we mentioned several new optimization improvements in GCC for Red Hat Enterprise Linux 7. It's time to dig a little deeper. In this post we will focus on partial inlining/function outlining which are part of the Inter-Procedural Analysis (IPA) framework. Function inlining is a well known technique to improve application performance by expanding the body of a called function into one or more of its call site(s). Function inlining decreases function call overhead, may improve icache...

In the first article of this series of two, we ran abidiff to compare the ABIs of the libstdc++.so shared libraries from RHEL 6.5 and RHEL 7. In this article, we are going to analyze the resulting ABI change report that was emitted. Analyzing the results The report starts with a header that summarizes the ABI differences: Functions changes summary: 0 Removed, 10 Changed (1260 filtered out), 112 Added functions Variables changes summary: 0 Removed, 3 Changed (72 filtered out)...

In this post I'm going to talk about using the nginx web server on Red Hat Enterprise Linux 7. nginx 1.4 was added as a "Tech Preview" in the v1.1 release of Red Hat Software Collections. Starting from a freshly kickstarted RHEL7 VM, here's how to get going: [root@virt-el7scratch ~]# subscription-manager repos --enable rhel-server-rhscl-7-rpms Repo 'rhel-server-rhscl-7-rpms' is enabled for this system. This enables the Red Hat Software Collections repository in the yum configuration, which is available with most RHEL entitlements...

Back story As virtualization was beginning it's march to prominence, we saw a phased approach to adoption. This is common with any sort of game changing technology....let's take electric cars as an example. Early adopters are willing to make certain trade-offs (short range) to gain new capabilities (saving money at the gas station). In the meantime, engineers are off in the lab working hard to increase the possible consumer-base for electric cars by increasing range, decreasing charging cycle times, and...

That the "free lunch is over" may have become something of a cliche in the IT industry, but the fact is that lately, the increase in cycles per second has been mostly realized by adding more processing units rather than by other techniques. While multiprocessor mainframes and supercomputers existed essentially since the dawn of computing, this may be the first time ever that the only machines without multicore processors may be those in USB fridges and electric toothbrushes. Involute of...

Reposted from the RHEL blog and written by Bhavna Sarathy. What if you could run your existing Red Hat Enterprise Linux 6 applications on Red Hat Enterprise Linux 7 without porting or making changes to your source code? Today, we are pleased to announce the immediate availability of the Red Hat Enterprise Linux 6 platform image, which allows for the creation of Red Hat Enterprise Linux 6-based application containers. Applications that have been developed, tested, and certified for Red Hat...

Red Hat today announced the general availability of Red Hat Enterprise Linux 6.6, the latest version of the company’s Red Hat Enterprise Linux 6 platform. Nearly four years since the launch of Red Hat Enterprise Linux 6 in 2010, Red Hat Enterprise Linux 6.6 provides a stable and secure foundation that enables organizations to tailor their infrastructure for the business needs of today while remaining flexible enough to prepare for the challenges of tomorrow. This flexibility enables enterprises to confidently...

For a long time one of the most frequent requests from users of Apache httpd on Red Hat Enterprise Linux 6 has been "Why aren't you shipping Apache 2.4 yet?". Well, the good news is: we are! There are actually two ways for Red Hat Enterprise Linux users to get httpd 2.4. The first is to upgrade to RHEL 7, which comes with httpd 2.4.6 natively. The second is to use Red Hat Software Collections on RHEL 6, and that's...

Backstory First, a brief backstory on the storage situation for Docker since it was open-sourced in early 2013. At that time, Docker relied on a filesystem called AUFS (advanced multi layered unification filesystem). This Union filesystem provided the necessary features to support several of Docker's main selling points: container creation speed copy-on-write image->container Docker still supports the AUFS backend, but Ubuntu has disabled it and moved the AUFS kernel module to linux-image-extra. The fact that AUFS never made it into...

(Part 1)In this session, we'll cover when developers should use Red Hat Enterprise Linux system tools, when they should use the Red Hat Developer Toolset, and when they should use Red Hat Software Collections. We'll describe the developer tools for Red Hat Enterprise Linux and make recommendations in context, based on the type of application and the application life cycle. Well also explain the targeted audience for the native system tools and why they are not appropriate for all applications...

Today, Red Hat is pleased to announce the beta availability of Red Hat Developer Toolset (DTS) 3.0 and Red Hat Software Collections (RHSCL) 1.2. New additions in this beta release include: Red Hat Developer Toolset 3.0. This update brings the Red Hat Developer Toolset with GCC 4.9 and Eclipse 4.4 (Luna) IDE to Red Hat Enterprise Linux 7 for the first time and gives C and C++ developers the ability to compile once and deploy to multiple versions of Red...

A recent thread on python-dev prompted me to summarise the current state of the ongoing industry-wide transition from bilingual to multilingual programming as it relates to Python's cross-platform support. It also relates to the reasons why Python 3 turned out to be more disruptive than the core development team initially expected. A good starting point for anyone interested in exploring this topic further is the "Origin and development" section of the Wikipedia article on Unicode, but I'll hit the key...

Abstract: Linux Container as a feature has been available for hobbyist usage for a while now; however, not only 'til recently where Docker, as a container deployment technolog, help built an open source community and gain wide adoption, has provided an easy way to deploy Linux Containers on the enterprise Linux. This talk will introduce and cover the various use cases and deployment models that are available and suited for enterprise devops work environment. By Linda Wang, Red Hat Sr...

Are you fed up by enabling multiple collections, which are dependent on themselves? We were. For example, thermostat needs mongo, mongo needs v8. Enabling them looks like: scl enable thermostat1 mongodb24 v8314 bash There another reason to use dependent collections: when you are missing packages in a RHSCL collection and you want to add them. Obviously, we don't plan to package everything because some packages have high maintenance costs or they are changing too fast even for two or three...

Introduction There has been already two ( first and second) guides which covered installing django using Red Hat Software Collections (RHSCL). While very popular, none of them went far enough to show a real world deployment example. This guide will try to provide full guidance together with sample project. I chose django 1.7 (as of time writing this guide, it's still in RC) because in a couple of months, it will be used by many and in a year or...

In previous articles we mentioned tips on how to package collections, but we never wrote about initscripts, which are one reason why daemons are harder to package as a collection. I've picked a short(er) initscript to show what has to be modified if you want to run your initscript in a collection. Below is the diff between the mongodb initscript and collection version of the mongodb initscript. Currently, logfiles, pidfiles and configuration files are stored mostly as in the example...

Containers introduce some intriguing usability, packaging and deployment patterns. These new patterns offer the potential to effect massive improvements to the enterprise application development and operations specialties. Containers also offer the promise of bare metal performance while offering some amount of isolation as well. But can they deliver on that promise ? Since earlier this year, the Performance Engineering Group at Red Hat has run huge amounts of microbenchmarks, benchmarks and application workloads in Docker containers. The output of that...

Do you have a Java application that runs fine at first but slows down after a while, or it runs fine for a small number of files but performance degrades for large number of files? Maybe you have a memory leak. About When fixing memory leaks; If someone were to ask me: "If you knew back then what you know now, what would you tell yourself?". Well, I would say..... Target Audience While in general the approach described in this...

Red Hat has released the beta version of Red Hat Enterprise Linux 6.6, the latest version of our Red Hat Enterprise Linux 6 platform. Red Hat Enterprise Linux 6.6 Beta includes enhancements to both security and stability as well as: Increased system performance An improved system administration experience Enhancements to Red Hat Enterprise Linux as a virtual guest Optimizations and tuning improvements include: Out-of-the-box support for Remote Direct Memory Access (RDMA) over Converged Ethernet (RoCE) to deliver low-latency, high bandwidth...