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Audiocasts/Shows: LINUX Unplugged, Homelab, and Tabliss

Filed under
GNU
Linux
  • Eating the License Cake | LINUX Unplugged 390

    Successful open-source projects all seem to struggle with one major gorilla. Who it is, and what their options are now.

    Special Guests: Drew DeVore and Jonathan Corbet.

  • The Raspberry Pi is a great way to get started with Homelab! (How to Homelab Episode 4)

    If you're looking for a low-cost way to enter into the world of Homelab, look no further than the Raspberry Pi! These small computers are plenty powerful to run quite a few Homelab apps, and in this video I give you my thoughts on why that is. In a future video, we'll explore running some apps on the Raspberry Pi but I wanted to create this video as an introduction to the concept of using a Pi in this way

  • Tabliss Is A "New Tab" Plugin For Firefox and Chrome

    Tabliss is a beautiful, customisable "New Tab" page for Firefox and Chrome, and the browsers that base of Firefox and Chrome (such as LibreWolf and Brave). In particular, it solves the "empty tab" problem that I was having on LibreWolf

Zentyal Server 7.0 Development Now Available

Filed under
GNU
Linux

Zentyal Development Team today announced the availability of Zentyal Server Development Edition 7.0. This is a new major community release of the Zentyal Linux Server, based on Ubuntu Server 20.04 LTS. This version comes with the most recent versions of all the integrated software, including Samba 4.11 and the latest stable SOGo version.

Zentyal Server provides an easy-to-use Linux alternative to Windows Server®. Thanks to the integration of Samba, Zentyal provides native compatibility with the Microsoft Active Directory® and allows transparent management of Windows® clients. It is used by companies and public administrations mainly as a domain and directory server and a file server. The graphical user inferface that Zentyal offers helps to make Linux server management easier for all and specially for new Linux users.

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Kernel: Moorestown, Nintendo 64, Corellium and Oracle

Filed under
Linux
  • Linux Says Farewell To Intel's Smartphone Attempts With Clearing Out Moorestown / Medfield

    Not only are some old ARM platforms and some obsolete, obscure CPU architectures on the chopping block for some spring cleaning in the Linux kernel, but the Intel Moorestown and Medfield "Mobile Internet Device" platforms are being phased out from the Linux kernel this spring as well.

    Moorestown was Intel's early Atom platform geared for handheld mobile Internet devices and smartphones.

  • With Linux 5.12 Set To Boot On The Nintendo 64, The N64 Controller Driver Is Now Queued - Phoronix

    A few days ago we wrote about Linux 5.12 to see support for the Nintendo 64 more than two decades after that MIPS-based video game console first shipped. While the practicality of Linux on the Nintendo 64 is particularly limited given only 4~8MB of RAM and the MIPS64 NEC VR4300 clocked under 100MHz, it's going upstream and now the N64 controller driver is also queued for this next kernel cycle.

    The code talked about a few days ago was getting Linux to boot on the Nintendo 64. With those 200+ lines of code in the MIPS architecture space is enough to get Linux booting on the Nintendo 64 when using a Flashcart device to be able to load the arbitrary code onto the game console.

  • Corellium to offer cloud-based iOS virtualisation to individual accounts

    The company, which only recently ported Ubuntu Linux to work on Apple Silicon Macs, has announced on their blog that they will now offer their virtualisation tools for iOS to individual accounts on their CORSEC platform. Previously, only enterprise accounts could access the service, while individuals could only access virtual Android devices.

  • Getting started with SystemTap on Oracle Linux

    There are a wealth of tools available for tracing and debugging the Linux kernel on a live system. These include Kprobes, Ftrace, trace-cmd, Dtrace, eBPF, SystemTap, crash, gdb, etc. Among these tools, few allow the user to develop and re-use scripts that can filter events and collect data more than just function arguments and returned values. Dtrace, eBPF and SystemTap are the ones among these tools that do.

  • Anticipating Your Memory Needs

    The Linux kernel organizes physical memory in units of pages of a certain size called base pages. For example, the default base page size when running on Intel processors is 4KB. These pages are allocated to user and kernel tasks as they need memory. When processing large amounts of data from slower disk devices, the Linux kernel uses a page cache to cache contents, like disk blocks, to speed up access to frequently accessed data. See this article for more details on how various caches are used by the Linux kernel. This has the positive effect of improving overall system performance but the memory for page cache must come from the same memory pool that is used by rest of the system. The kernel allocates all the memory not currently in use to the page cache. As the kernel needs to allocate more memory for other tasks, it can reclaim pages from the page cache since the contents in the page cache can be restored from disk blocks when the need arises. Reclamation happens as the kernel starts to run low on free memory pages. Individual memory pages are the base pages. As pages are reclaimed, any contiguous base pages are grouped together (compaction) to form higher order pages. Higher order pages are groups of 2^n physically contiguous pages where n is the page order. Higher order pages can then be used to satisfy higher order page allocation requests, for example if an allocation request is for 8 pages, that allocation will be made from order 3 page group.

    The kernel recovers physical memory in the event of a shortage by page reclamation and/or compaction. Both methods are implemented in a similar fashion. As the amount of free memory falls below the low threshold (watermark), memory pages are reclaimed asynchronously via kswapd or compacted via kcompactd. If the free memory continues to fall below a minimum watermark, any allocation request is forced to perform reclamation/compaction synchronously before it can be fulfilled. The latter synchronous method is referred to as the "direct" path and is considerably slower owing to being stalled waiting for memory to be reclaimed. The corresponding stall in the caller results in a non-deterministic increased latency for the operation it is performing and is typically perceived as an impact on performance.

NPU-equipped Rockchip RV1109 debuts on dev boards and cameras

Filed under
Linux

JWIPC unveiled three “R19x” SBCs that run Linux on Rockchip’s dual -A7, 1.2-TOPS NPU equipped RV1109 camera SoC. Meanwhile, Firefly released two “CAM-C11x” cameras based on the RV1109 and similar quad-core, 2.0-TOPS RV1126.

Shenzhen-based JWIPC, which we last covered back in 2014 with its Intel Bay Trail based S015 Dual System signage player, has posted product pages for three development boards built around Rockchip’s new RV1109 camera SoC (translated). The R19x boards are aimed at security access point face recognition applications. The R19S and mini-PCIe and SIM-equipped R19F are 100 x 72mm Pico-ITX SBCs while the R19N has a smaller 100 x 60mm footprint.

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10 of the Best Linux Debuggers for Software Engineers

Filed under
Linux
Software

Debuggers are essential for locating bugs in programs. There is a plethora of robust Linux debuggers that make it easy to find weak points in your applications. We will outline some of these applications in this guide. Try some of these tools to get a feel of how debugging works in Linux.

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Is Oracle Linux a valid replacement for CentOS?

Filed under
Linux
Red Hat

By now you're probably suffering from CentOS exposure--it's been all over the place. Every day, someone is writing about what Red Hat did to the beloved Linux distribution that powers so many data centers and services. The reaction has been so sharp, that many forks of CentOS have begun to pop up. Some of these forks look seriously promising, even drop-in 1:1 binary compatibility with RHEL 8. When those forks appear, the landscape will most likely shift. However, until then, where's a business to turn?

Do you go with CentOS 8 Stream? Some might. Others, on the other hand, see Stream as an impossible option, due to cPanel pulling support, which is a very big deal.

What do you do? You could turn to Oracle Linux. Before you protest, I didn't say you should turn to Oracle Linux; I said you could.

Why did I feel the need to make that clarification?

Let me explain, and then I'll get into why Oracle Linux is a viable choice.

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Nvidia 460.39 Driver Adds Support for Linux 5.10 LTS, GeForce RTX 3000 Series of Laptop GPUs

Filed under
Linux

Nvidia 460.39 is here three weeks after Nvidia 460.32.03 and introduces support for new graphics cards, including NVIDIA GeForce RTX 3060, NVIDIA GeForce RTX 3070, and NVIDIA GeForce RTX 3080 laptop GPUs, as well as NVIDIA GeForce GT 1010. This support is available only for GNU/Linux and FreeBSD systems.

Linux users would be happy to learn that the new Nvidia graphics adds support for newer kernels, such as the latest and greatest Linux 5.10 LTS series, restoring essential functionality like runtime power management, hot-plugging of audio-capable display devices, as well as S0ix-based system suspend.

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Kali Linux hands-on: A look at the installation options

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Linux

Anyone involved in or even significantly interested in cybersecurity has probably heard of Kali Linux. Since its early days as BackTrack, it has been considered the standard in penetration testing and security analysis platforms. In my opinion, it also happens to be one of the best Debian GNU/Linux distributions available.

It is based on Debian stable (currently 10/buster), but with a much more current Linux kernel (currently 5.9 in Kali, compared to 4.19 in Debian stable and 5.10 in Debian testing).

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Should Ubuntu Adopt KDE Plasma as Default Desktop? [Opinion and Analysis]

Filed under
Linux
Ubuntu

With the recent GNOME 40 design change and Ubuntu decides to follow the “wait-and-watch” principle for its adaptation, we analyze whether Ubuntu should adopt KDE Plasma as its Default Desktop, saying goodbye to GNOME.
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Tails 4.15 Anonymous OS Released with Tor Browser 10.0.9 and Thunderbird 78.6

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Linux

Synced with the stable software repositories of the Debian GNU/Linux 10 “Buster” operating system series, Tails 4.15 is powered by Linux kernel 5.9.15 for improved hardware support and comes with updated core applications, including the Tor Browser 10.0.9 anonymous web browser and Mozilla Thunderbird 78.6 email client.

On top of these updates, Tails 4.15 also improves support for Ledger hardware wallets in the Electrum Bitcoin wallet app, adds USB tethering support for devices running Apple’s iOS 14 or later to share mobile data, and clarifies the error message about the size of the USB flash drive shown when starting Tails.

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Free Software Leftovers

  • Ingo Juergensmann: Migrating from Drupal to WordPress

    If you can read this on planet.debian.org then migrating my blog from Drupal to WordPress was successful and the feed has been successfully changed by the Debian Planet Maintainers (thanks!). I’ve been a long term Drupal user. I think I started to use Drupal since it was included in Debian. At some point Drupal was removed from Debian and I started to use Serendipity instead. Later Drupal was included in Debian again and I moved back to Drupal. I think this must have been around Drupal 4 or Drupal 5. No idea. I even became active in the Drupal community and went to one of the first Drupal barcamps in Germany, namely in Cologne. This was shortly before Dries Buytaert started a business off of Drupal and went to the USA. I met with many devs of Drupal in Cologne and enjoyed the community and started with others a local Drupal User Group in Rostock. [...] So, after all the years my Drupal journey will come to an end. It was a long time with you. Sometimes joyful, sometimes painful. I wish you all the best, Drupal!

  • The round-the-world trip to fix a bug

    Mrs. Vera Cavalcante (@veracape), from Brazil, a long-time contributor for the Portuguese documentation on LibreOffice, was reviewing the translation of the Calc Guide and double-checking the translated text, with respect to the current user interface and the Help pages. Vera noticed that the Help pages on conditional formatting were not correct any more, and reported in the Brazilian team Telegram group (Bugzilla is still very hard for non-native English speakers).…

  • Red Kubes Container Platform Flies Open Source Flag

    Red Kubes, a Dutch-based startup, open sourced a free community edition of its Otomi Container Platform in a bid to remedy the ongoing complexity surrounding Kubernetes configurations. The scalability, agility, and speed-to-market advantages that Kubernetes offers have been handsome enough to capture a growing share of the enterprise market, but this very strength can become an Achilles heel for container deployments. In this sense, it’s far too easy – and common – to create thousands or even tens of thousands of containers across applications. Not only does this create an operational money pit, but management becomes a herculean feat to any container newbie.

  • The Apache Software Foundation Announces Apache® ECharts™ as a Top-Level Project

    The Apache Software Foundation (ASF), the all-volunteer developers, stewards, and incubators of more than 350 Open Source projects and initiatives, announced today Apache® ECharts™ as a Top-Level Project (TLP). Apache ECharts is an intuitive, interactive, and powerful charting and visualization library ideally suited for commercial-grade presentations. The project originated in 2013 at Baidu and entered the Apache Incubator in January 2018.

  • Shots fired in disputes over OSS-as-a-Service

    Cloud services are the great disruptor of both IT organizations and vendors, and wrapping open source software around a service is the latest flashpoint. The open source development model has proven to be an incredible incubator of innovative software by democratizing and distributing the conception, design, implementation and debugging of new titles, advantages that were thoroughly explored more than two decades ago in the book, The Cathedral and the Bazaar. Although open source has since been adopted, encouraged and sponsored by every major software company, its origins were decidedly non-commercial with utopian overtones of liberating code from the tyranny of proprietary shackles. The earliest open source projects, notably Gnu Emacs and other tools from the Gnu Project, embraced this idealistic ethos with a restrictive, comprehensive license, GPL, that applies to derivative work using the code.

  • AWS to Fork Elasticsearch as Elastic Moves Away from Open Source

    Elastic’s license change from open source ALv2 to SSPL appears to have moved Amazon Web Services to “launch new forks of both Elasticsearch and Kibana.” Elasticsearch’s move towards the more restrictive Server Side Public License has already begun to ruffle feathers among developers.

Programming Leftovers

  • Excellent Free Tutorials to Learn Tcl - LinuxLinks

    Tcl (Tool Command Language) is a dynamic programming/scripting language based on concepts of Lisp, C, and Unix shells. Here's our recommended free tutorials to learn Tcl.

  • ROC and Precision-Recall curves - How do they compare?

    Both curves offer two useful information: how to choose the positive class prediction threshold and what is the overall performance of the classification model. The former is determined by selecting the threshold which yield the best tradeoff, in adequation with the prediction task and operational needs. The latter is done by measuring the area under the curves which informs about how good the model is, because by measuring the area under the curves, one computes the overall probability that a sample from the negative class has a lower probability than a sample from the positive class. With scikit-learn, the values can be computed either by using the roc_auc attribute of the object returned by plot_roc_curve() or by calling roc_auc_score() directly for ROC curves and by using the average_precision attribute of the object returned by plot_precision_recall_curve() or by calling average_precision_score() directly for PR curves.

  • Write GIMP scripts to make image processing faster | Opensource.com

    Some time ago, I wanted to give a blackboard-style look to a typeset equation. I started playing around with the GNU Image Manipulation Program (GIMP) and was satisfied with the result. The problem was that I had to perform several actions on the image, I wanted to use this style again, and I did not want to repeat the steps for all the images. Besides, I was sure that I would forget them in no time.

  • Bash wait Command | Linuxize

    wait is a command that waits for the given jobs to complete and returns the exit status of the waited for command. Since the wait command affects the current shell execution environment, it is implemented as a built-in command in most shells. In this article, we’ll explore the Bash built-in wait command.

  • Santiago Zarate: Cron do not send me empty emails
  • Rust & the case of the disappearing stack frames | Inside Rust Blog

    Now that the FFI-unwind Project Group has merged an RFC specifying the "C unwind" ABI and removing some instances of undefined behavior in the "C" ABI, we are ready to establish new goals for the group. Our most important task, of course, is to implement the newly-specified behavior. This work has been undertaken by Katelyn Martin and can be followed here.

Open Hardware: Raspberry Pi, Arduino, Thomas Petazzoni (Bootlin) on Training

  • Qsync fixed on the Pi4 and FF compiled

    The Raspberry Pi4 does not have a hardware battery-backed clock, so relies on getting the date and time from an Internet time server. In EasyOS, Qsync is the utility that does that. At first bootup, QuickSetup has a checkbox to enable getting time from the Internet, which will launch Qsync. At first bootup on the Pi4, if you are going to connect to Internet via wifi, not ethernet, then there won't be an immediate Internet access. No problem, Qsync will run once the Internet connection is established. Qsync will run just once at bootup and after Internet connection. That's fine, but I couldn't understand why it would suddenly stop working. Then discovered that /etc/init.d/qsync was getting its executable-flag cleared.

  • Arduino Blog » This children’s console looks like something straight out of a superhero’s lair

    Kids have wonderful imaginations, and to help students at a primary school have a super time, creator “palladin” was asked to construct a console for them to use. The device features a variety of lights and sci-fi additions, including glowing “reactor” tubes that diffuse light using hair gel and a “memory bank” that emits flashing patterns for a 1950s supercomputer look.

  • Arduino Blog » This pen plotter draws detailed maps the size of walls

    Christopher Getschmann wanted a wall-sized map of the world. He soon realized, however, that it’s tough to actually buy such a map that’s both beautiful and detailed enough to satisfy his cartographic tastes. While many would simply move on to the next “thing,” Getschmann instead took things into his own hands, and built a pen plotter specifically to draw massive 2×3 meter map for his wall.

  • New training course: embedded Linux boot time optimization

    For many embedded products, the issue of how much time it takes from power-on to the application being fully usable by the end-user is an important challenge. Bootlin has been providing its expertise and experience in this area to its customers for many years through numerous boot time optimization projects, and we have shared this knowledge through a number of talks at several conferences over the past years. We are now happy to announce that we have a new training course Embedded Linux boot time optimization, open for public registration. This training course was already given to selected Bootlin customers and is now available for everyone.

Red Hat/Fedora Leftovers

     
  • A brief introduction to Ansible roles for Linux system administration

    In this part one of two articles, learn to use rhel-system-roles with your Ansible deployment to better manage functionality such as network, firewall, SELinux, and more on your Red Hat Enterprise Linux servers.

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  • From Docker Compose to Kubernetes with Podman | Enable Sysadmin

    Use Podman 3.0 to convert Docker Compose YAML to a format Podman recognizes.

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  • Fedora Community Blog: Software Management (RPM, DNF) 2020 retrospective

    On behalf of the RPM and DNF teams, I would like to highlight changes that have appeared in our packages in 2020. Thanks everyone for your bug reports and patches!

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  • Application and data resiliency for Kubernetes

    Using tools like Red Hat OpenShift and Red Hat OpenShift Container Storage, organizations are developing and deploying more stateful applications and microservices at an accelerating pace. According to a recent Enterprise Strategy Group (ESG) research study, 41% of companies currently use containers for production applications. Another 33% use containers for dev/test and pre-production only but plan to use containers for production applications in the next 12 months.

  • Red Hat Introduces Data Resilience for Enterprise Kubernetes Applications

    Red Hat, Inc., the world's leading provider of open source solutions, today introduced new data resilience capabilities for cloud-native workloads with the release of Red Hat OpenShift Container Storage 4.6. This offering from Red Hat Data Services enables customers to extend their existing data protection solutions and infrastructure to enhance data resilience for cloud-native workloads across hybrid and multicloud environments.

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  • Why Red Hat killed CentOS—a CentOS board member speaks

    This morning, The Register's Tim Anderson published excerpts of an interview with the CentOS project's Brian Exelbierd. Exelbierd is a member of the CentOS board and its official liaison with Red Hat. Exelbierd spoke to Anderson to give an insider's perspective on Red Hat's effective termination of CentOS Linux in December, in which the open source giant announced CentOS Linux was to be deprecated immediately—with security upgrades to CentOS Linux 8 ending later in 2021 rather than the 2029 end of support date CentOS users expected.