Operating System Archives - Red Hat Developer

Introducing debuginfod, the elfutils debuginfo server

By Aaron Merey October 14, 2019October 14, 2019

Because bugs are inevitable, developers need quick and easy access to the artifacts that debugging tools like Systemtap and GDB depend on, which are typically DWARF (Debugging With Attributed Record Formats) debuginfo or source files. Accessing these resources should not be an issue when debugging your own local build tree, but all too often they are not readily available.

For example, your distro might package debuginfo and source files separately from the executable you’re trying to debug and you may lack the permissions to install these packages. Or, perhaps you’re debugging within a container that was not built with these resources, or maybe you simply don’t want these files taking up space on your machine.

Debuginfo files are notorious for taking up large amounts of space, and it is not unusual for their size to be five to fifteen times that of the corresponding executable. debuginfod aims to resolve these problems.

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Changes to CentOS: What CentOS Stream means for developers

By Bob Davis September 24, 2019September 30, 2019

Today Chris Wright, vice president and CTO at Red Hat, published a post describing how CentOS is changing and the opportunities it opens for developers in the Red Hat Enterprise Linux (RHEL) ecosystem. The net effect of this change is that, in addition to CentOS Linux 8, there is a new version of CentOS—CentOS Stream—which will provide a “rolling preview” of future Red Hat Enterprise Linux kernels and features. This is being announced in addition to the release of the traditional CentOS Linux 8, which is a downstream rebuild of the current RHEL release.

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Easy-to-use tools are key to CI/CD success says 2019 State of DevOps Report

By Editorial Team September 18, 2019September 17, 2019

The most effective strategies for scaling DevOps and fostering productivity include easy-to-use tools and solutions that create community, according to the 2019 Accelerate State of DevOps Report.

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Why you should be developing on Red Hat Enterprise Linux

By Bob Davis August 21, 2019August 26, 2019

Red Hat Enterprise Linux through Red Hat Developer is designed specifically so that software can be developed on the same platform to which it will be deployed—and here’s why it’s the best option for you.

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Using Let’s Encrypt with Apache httpd on Red Hat Enterprise Linux 7

By Joe Orton August 2, 2019July 29, 2019

Getting an SSL certificate for your web server has traditionally been a something of an effort. You need to correctly generate a weird thing called a certificate signing request (CSR), submit it to the web page of your chosen Certificate Authority (CA), wait for them to sign and generate a certificate, work out where to put the certificate to configure it for your web server—making sure you also configure any required intermediate CA certificates—and then restart the web server. If you got all that right, you then need to enter a calendar entry so you’ll remember to go through the process again in (say) a year’s time. Even some of the biggest names in IT can mess up this process.

With new CAs like Let’s Encrypt, along with some supporting software, the rigmarole around SSL certificates becomes a thing of the past. The technology behind this revolution is Automatic Certificate Management Environment (ACME), a new IETF standard (RFC 8555) client/server protocol which allows TLS certificates to be automatically obtained, deployed, and renewed. In this protocol, an “agent” running on the server that needs an SSL certificate will talk to to the CA’s ACME server over HTTP.

A popular method for using ACME on your Red Hat Enterprise Linux 7 server is certbot. Certbot is a standalone ACME agent that is configured out-of-the-box to work with Let’s Encrypt and can work with Apache httpd, Nginx, and a wide variety of other web (and non-web!) servers. The certbot authors have an excellent guide describing how to set up certbot with httpd on RHEL7.

In this tutorial, I’ll show an alternative method—the mod_md module—which is an ACME agent implemented as a module for Apache httpd, tightly integrated with mod_ssl, and is supported today in Red Hat Enterprise Linux 7. The mod_md module was implemented by Stefan Eissing—a prolific developer who also added HTTP/2 support to httpd—and contributed to the Apache Software Foundation, becoming a standard part of any new installation since httpd version 2.4.30.

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Quickly set up a LAMP stack on Red Hat Enterprise Linux 8

By Maxim Burgerhout July 3, 2019July 8, 2019

Have you tried Red Hat Enterprise Linux 8 (RHEL8) yet? Read on to learn how to quickly set up a LAMP stack on RHEL8 so you can play around with the new features built into the operating system.

A LAMP stack is made up of four main components and some glue. The first main component in a LAMP stack (the “L”) is Linux. In my example, I’m using Red Hat Enterprise Linux 8 for that, which gives me a secure operating system, a modern programming environment, and a user-friendly set of tools to control it.

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Project Loom: Lightweight Java threads

By Faisal Masood June 19, 2019June 26, 2019

Building responsiveness applications is a never-ending task. With the rise of powerful and multicore CPUs, more raw power is available for applications to consume. In Java, threads are used to make the application work on multiple tasks concurrently. A developer starts a Java thread in the program, and tasks are assigned to this thread to get processed. Threads can do a variety of tasks, such as read from a file, write to a database, take input from a user, and so on.

In this article, we’ll explain more about threads and introduce Project Loom, which supports high-throughput and lightweight concurrency in Java to help simplify writing scalable software.

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Working with Red Hat Enterprise Linux Universal Base Images (UBI)

By Fernando Lozano May 31, 2019September 23, 2019

If you’re like me—a developer who works with customers who rely on the tried-and-true Red Hat Enterprise Linux (RHEL), works with containerized applications, and also prefers to work with Fedora Linux as their desktop operating system—you’re excited by the announcement of the Universal Base Images (UBI). This article shows how UBI actually works, by building the container image for a simple PHP application.

With UBI, you can build and redistribute container images based on Red Hat Enterprise Linux without requiring a Red Hat subscription. Users of UBI-based container images do not need Red Hat subscriptions. No more extra work creating CentOS-based container images for your community projects or for your customers that prefer self-support.

I tested all these steps on my personal Fedora 29 system, and they should work on any Linux distribution. I am also a big fan of the new container tools such as Podman, which should be available to your favorite Linux distribution. If you are working on a Windows or MacOS system, you can replace the Podman commands with Docker.

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Accessing UNIX sockets remotely from .NET

By Tom Deseyn May 30, 2019May 28, 2019

Many Linux services (like D-Bus, PostgreSQL, Docker, etc.) are made accessible locally using a UNIX socket. In this article, we’ll show how you can access such services remotely from .NET using SSH port forwarding.

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