Red Hat Enterprise Linux

Red Hat is pleased to announce the general availability of Red Hat Developer Toolset 2.1. This latest version bridges development agility with production stability by delivering the latest stable versions of essential open development tools to enhance developer productivity and improve deployment times. Red Hat Developer Toolset 2.1 introduces a new tool to its content set – Git 1.8.4 – and updates key packages to help developers deliver new applications and functionality faster. Red Hat Developer Toolset enables C and...

Red Hat | Red Hat Announces Certification for Containerized Applications, Extends Customer Confidence and Trust to the Cloud. Red Hat "announced the extension of its application certification program to include containerized applications. The Red Hat Container Certification ensures that application containers built using Red Hat Enterprise Linux will operate seamlessly across certified container hosts. " Read the whole article.

As many of you have probably experienced, creating your own rpms can be handy, but what is even better is if you can access those rpms from anywhere on the internet. It is also handy to be able to share the rpms with your friends :). In the past that has meant building all of the rpms for the various RHEL-ecosystem OSs and then finding somewhere you can host them and maintaining it yourself. What I am excited to tell...

All modern processors use page-based mechanisms to translate the user-space processes virtual addresses into physical addresses for RAM. The pages are commonly 4KB in size and the processor can hold a limited number of virtual-to-physical address mappings in the Translation Lookaside Buffers (TLB). The number TLB entries ranges from tens to hundreds of mappings. This limits a processor to a few megabytes of memory it can address without changing the TLB entries. When a virtual-to-physical address mapping is not in...

Modern computer systems include cache memory to hide the higher latency and lower bandwidth of RAM memory from the processor. The cache has access latencies ranging from a few processor cycles to ten or twenty cycles rather than the hundreds of cycles needed to access RAM. If the processor must frequently obtain data from the RAM rather than the cache, performance will suffer. With Red Hat Enterprise Linux 6 and newer distributions, the system use of cache can be measured...

One of the really useful tools provided by Red Hat Developer Toolset v2.x is " memstomp", which helps you identify a particularly nasty class of bug in applications built (directly or indirectly) from C/C++ code so you can then fix them before your customers experience problems. In this brief article, I'll explain the background for the tool, how to get it, how to use it yourself and briefly how it works. Background The memcpy() routine in the standard C library...

The Ruby Interpreter includes a profiling tool which is invoked with the -rprofile option on the command line. Below is an example running the Ruby Fibonacci program ( fib.rb) included in Ruby documentation samples. The list of functions is sorted from most to least time spent exclusively in the function ( self seconds). The first column provides the percentage of self seconds for each function. The cumulative seconds indicates the amount of time spent in that function and the functions...

I've been getting more and more questions about using Python's virtualenv with python27 and python33 collections from RHSCL, so I decided to write a very short tutorial about this topic. The "tl;dr" version is: everything works perfectly fine as long as you remember to enable the collection first. Update 2018: An updated article has been published, See How to install Python 3, pip, venv, virtualenv, and pipenv on Red Hat Enterprise Linux. What is Virtualenv Citing Virtualenv official documentation: "virtualenv...

Red Hat's Bhavna Sarathy writes about Red Hat Enterprise Linux 7 Beta “The 7th Guest”? in the rhelblog.redhat.com.

oVirt is an open source management system for KVM-powered virtual machines. Red Hat Enterprise Virtualization (RHEV) derives from oVirt in the same fashion that Red Hat Enterprise Linux is derived from Fedora. oVirt's (and RHEV's) central management component, called oVirt-Engine, is written in Java and runs on top of JBoss. Engine controls dozens of nodes that may run many dozens of VMs each. Besides sounding like an improper innuendo when pronounced by Spanish-speaking people, "Vdsm" is Engine's per-node agent. It's...

Hopefully, a lot of you are trying out RHEL 7. I know I have been for the last weeks and I documented my experience in an earlier post. Initially, I had some trepidation about moving to the new beta without EPEL being available. For the most part, I have been able to track down RPMs for everything I need that wasn't included in the Beta, but, I am happy to discover that the "beta" of EPEL for RHEL7 is now...

Although most of Python enterprise applications still use Python 2 (e.g. Python 2.4 on RHEL 5 or Python 2.6 on RHEL 6), Python 3 has already become a mature variant and is worth considering. Why, you ask? Python 3 series is being actively developed by upstream, while Python 2 now only gets security fixes and bug fixes. Python 2.7 is the latest minor release of the 2.X series and there will be no Python 2.8. This is very important since...

For RHEL6 and newer distributions tools are available to profile Python code and to generate dynamic call graphs of a program's execution. Flat profiles can be obtained with the cProfile module and dynamic callgraphs can be obtained with pycallgraph. The cProfile Python module records information about each of the python methods run. For older versions of Python that do not include the cProfile module you can use the higher overhead profile module. Profiling is fairly simple with the cProfile module...

Red Hat's David Cantrell explains what is new in Red Hat Enterprise Linux 7 with regards to Installation.

An informative article by Bhavna Sarathy of Red Hat. KVM Virtualization: Refining the Virtual World with Red Hat Enterprise Linux 7 Beta | Red Hat Enterprise Linux Blog.

Check out this informative RHEL 7 article by Eric Dube. Network Management, Bandwidth, and Security | Red Hat Enterprise Linux Blog.

DeveloperWeek 2014 Innovator awards have been announced and Red Hat has garnished two of them: 1. Platform-as-a-Service: Red Hat OpenShift 2. Coding Environments: Red Hat Software Collections Thank you to all of you who voted! And thank you to all of the Red Hatters that contributed to delivering these two offerings. Note that coincidentally, Red Hat Software Collections eventually become OpenShift cartridges. Also, Red Hat will be a sponsor at DeveloperWeek Conference + Expo, February 18-19, in San Francisco, so...

Who Goes There? Identity Management in Red Hat Enterprise Linux 7 Beta | Red Hat Enterprise Linux Blog. by Ellen Newlands, Red Hat.

The Developer Conference in Brno will be held February 7-9th. I'd like to invite you to these interesting presentations prepared by my colleagues. DevAssistant - What's in it for you Friday, February 7 • 11:30 - 12:10 DevAssistant is a new tool that targets both development beginners and seasoned coders. It can set up development environment, kickstart new projects in various languages and frameworks and install dependencies. Plugins for docker.io are in the road map. Create your own collection, (also...

I decided to switch to the RHEL 7 Beta on my work laptop. As a result, I thought I would outline my experience here. First and foremost, my drive is pretty well partitioned with /home and root ("/") separated. I also keep most of my "work" in a separate mount under /mnt/nbu ("nbu" stands for "not backed up" which is not strictly true, it just doesn't use the corporate backup :) and the name stuck). However, I don't want to...

NFS & GFS2 | Red Hat Enterprise Linux Blog.

Red Hat Developer Toolset users - tell us which components you're using and which ones you intend to use. Also - tell us what blogs/articles you'd like to see on any of them. The better we understand your needs, the better we can address them. Thank you!

What will the be the new default file system in RHEL 7? Read John's article to find out. Is there a best Linux file system? | Red Hat Enterprise Linux Blog.

You might already heard about DevConf conference in Brno (February 7-9th). If not, it's an open conference for all Linux and JBoss Developers, Admins and advanced Linux users organized by Red Hat Czech Republic. There will also be a lab dedicated to Software Collections on Friday 3:50-5:20. Maintainers of Red Hat Software Collections will attend the lab, so you have great opportunity to ask how to add new modules into a Ruby collection or whatever bothers you. What's the lab...

This is part 2 of a 2-part article about Advanced Integration with RHEV-M. The first part is available here. In the last part you learned how to perform different operations on the engine from the outside using the API/SDK. In this part you'll learn how you can influence the engine from the inside, using extension APIs Extension APIs In this section we will describe the following APIs: UI plugins API (also covered in http://ovedou.blogspot.com and http://www.ovirt.org/Features/UIPlugins) - an API that...