News & Tutorials

DevAssistant: A developer’s best friend

DevAssistant: A developer’s best friend

One application I came across while testing an installation of the main edition Fedora 21 alpha is DevAssistant. (See Fedora 21 Workstation: GNOME 3. KDE and Anaconda screenshots.) DevAssistant automates the process of setting up development environments for a few of the most popular programming languages and development frameworks. Languages supported are shown in the screenshot below. Just after a […]

Mozilla is phasing out SHA-1 based signature algorithms

Mozilla’s Security Engineering Team has announced that they are proactively phasing out the SHA-1 based signature algorithms for digital certificates, stemming from a concern that it too, like the MD5 hash algorithm, could be susceptible to collision attacks. Here’s an excerpt from the official announcement: SHA-1 is nearly twenty years old, and is beginning to show its age. In the […]

Fedora 21 Workstation: GNOME 3. KDE and Anaconda screenshots

Fedora 21 Workstation: GNOME 3. KDE and Anaconda screenshots

The alpha version of what will become Fedora 21 Workstation, which is scheduled for release before the end of this year (tentatively December 2 2014), was made available for download and testing yesterday. Fedora Workstation is the branch of the distribution that’s designed primarily for use on the desktop. The other branches are Fedora Server and Fedora Cloud. Separate ISO […]

How to install Oracle JRE and make it the default JRE on Ubuntu 14.04

How to install Oracle JRE and make it the default JRE on Ubuntu 14.04

A few hours ago I had to install DataStax OpsCenter from the DataStax (community) repository on a new installation of Ubuntu 14.04. DataStax OpsCenter is a browser-based management application for DataStax Enterprise, DataStax Community and Apache Cassandra, a distributed NoSQL database. Cassandra/OpsCenter requires Oracle JRE, but applications installed using Ubuntu’s package manager are hard-wired to use OpenJDK JRE. So if […]

How to set up a 3-node CoreOS cluster, just for fun

How to set up a 3-node CoreOS cluster, just for fun

“CoreOS is a new Linux distribution that has been rearchitected to provide features needed to run modern infrastructure stacks.” That’s geek-speak for a Linux distribution that makes it (not-so-) super easy to run fun things like Linux containers and containerized applications on commodity hardware. That’s one of the trending things in the business, and it’s the kind of stuff I […]

How to install Oracle JRE on Fedora 20 and use alternatives to switch between it and OpenJDK

How to install Oracle JRE on Fedora 20 and use alternatives to switch between it and OpenJDK

All the Java components installed on Fedora (20) are provided by OpenJDK (Open Java Development Kit), a Free Software implementation of Java SE (Standard Edition). It’s all you’ll need except when you have to install an application that requires Oracle JRE (Java Runtime Environment). One such application is the community edition of Datastax Cassandra, a NoSQL database. I thought I […]

Toshi, an MIT-licensed bitcoin node for developers released

Toshi, an MIT-licensed bitcoin node for developers released

Coinbase has announced the released of Toshi, a bitcoin node for developers. Toshi is strictly a developers-only solution that’s written in Ruby, uses a PostgreSQL backend and comes with a very powerful API, though it is still a beta application. It is released under the MIT License. Toshi just makes it easy to build “bitcoin applications by querying blockchain data.” […]

Installing, troubleshooting MongoDB 2.6.4 startup failure on Fedora 20

I’ve been running MongoDB on Debian-based distribution and haven’t had any issue installing or managing it. However, when I tried to set it up on my main desktop, which is running Fedora 20 KDE, I ran into an annoying problem. This post documents what that problem was and a solution that worked for me. The latest stable edition of MongoDB […]

How to extend, grow or resize an LVM logical volume

How to extend, grow or resize an LVM logical volume

This short tutorial shows how to resize an LVM logical volume. WARNING: Do not reduce the size of an active logical volume. It is the easiest way to lose you data. Recovery is possible, but it can be an involved process. Use this just as a guide on how to grow an LVM logical volume. The screenshots you see in […]

Is systemd as bad as boycott systemd is trying to make it?

From just a purely end-user perspective, systemd is an application that I’ve come to like a lot. And I think that its adoption by all Linux distributions will make it easier to manage Linux systems. But it has come under heavy criticism from some quarters – for trying to be a Swiss-army-knife-type application. One that does practically anything and everything, […]

GhostBSD 4 preview

GhostBSD 4 preview

GhostBSD is a desktop distribution that’s based on FreeBSD. The project started out with support for several desktop environments (Gnome, Mate, XFCE, LXDE, and Openbox), but has since become a MATE-only distribution. The next stable version will be GhostBSD 4, which should be released within the next few months. Meanwhile The second release candidate was made available for download a […]

Upgrade Ubuntu 12.04 server to 14.04

Upgrade Ubuntu 12.04 server to 14.04

‘Tis the season for upgrading. First was upgrading OSSEC from 2.7 to 2.8, see Upgrading OSSEC 2.7 to 2.8 and the bro-ids rule issue. Now’s the time to upgrade the server that OSSEC was protecting. Before the upgrade, the server was running Ubuntu 12.04 LTS. It was upgraded to Ubuntu 14.04 LTS less than an hour ago. Here’s how I […]

Upgrading OSSEC 2.7 to 2.8 and the bro-ids rule issue

Upgrading OSSEC 2.7 to 2.8 and the bro-ids rule issue

‘Tis the season for upgrading. This hour, the target is OSSEC. Next will be a Cloud server running Ubuntu 12.04 LTS, which will be upgraded to Ubuntu 14.04 LTS OSSEC is a cross-platform and Free Software “host-based Intrusion Detection System that performs log analysis, file integrity checking, policy monitoring, rootkit detection, real-time alerting and active response.” It is one of […]

Project Denver SoC will be the first 64-bit ARM processor for Android

Project Denver SoC will be the first 64-bit ARM processor for Android

NVIDIA has revealed architectural details of the 64-bit version of the Tegra K1 System-on-Chip (SoC). Being developed under the Project Denver code name, it will be the first 64-bit ARM SoC for Android. The 32-bit version of Tegra K1 already powers several notable mobile devices, including the NVIDIA Shield tablet and the just announced Acer Chromebook 13. From the official […]

Acer Chromebook 13 has NVIDIA Tegra K1 processor inside

Acer Chromebook 13 has NVIDIA Tegra K1 processor inside

Chromebook 13 is the latest Chromebook from Acer. It is powered by the NVIDIA Tegra K1 processor and is the first Tegra K1-powered Chromebook. The Tegra K1 is a mobile processor built atop NVIDIA’s Kepler™ architecture that features a 4-Plus-1™ quad-core ARM® Cortex™-A15 CPU. It is the same processor inside the NVIDIA Shield Tablet. The Chromebook 13 features a 13.3-inch […]

Security risks posed by smart meters

Security risks posed by smart meters

In a world of always-on connectivity, Internet of Everything and Internet of Things, where most devices now have an embedded computer, the risk posed by hackers tampering with them cannot be overlooked. I don’t have a smart meter at home, but in the near-future, most homes, including mine, will have one. That’s why I like to read and learn as […]

Privacy Badger beta released. Install it on Firefox and Chrome

Privacy Badger beta released. Install it on Firefox and Chrome

The Electronic Frontier Foundation has announced the release of Privacy Badger beta. This comes roughly three months after the alpha version was released. Privacy Badger is a browser add-on for Firefox and Chrome that’s designed to stop “advertisers and other third-party trackers from secretly tracking where you go and what pages you look at on the web.” And it’s designed […]

From Akregator and Liferea to Inoreader

From Akregator and Liferea to Inoreader

Over the years I’ve used a variety of local, 3-party and self-hosted RSS Feed readers. My preference has always been self-hosted RSS readers, chiefly because the local clients available (Akregator and Liferea) were not that good and I was never a fan of Google Cloud services (Google Reader when it was still active). At one point I got tired of […]

BitKey: A secure, Debian-based Live OS for bitcoin transactions

BitKey: A secure, Debian-based Live OS for bitcoin transactions

The official description of BitKey says that it is a “self-contained read-only CD/USB stick with everything you need to perform highly secure air-gapped Bitcoin transactions.” It is a side project of the developers of TurnKey Linux, a Debian-based distribution that provides a set of ready-to-use server virtual appliances. BitKey itself is a simple solution for bitcoin users. The current build […]

EFF releases experimental open wireless router firmware

EFF releases experimental open wireless router firmware

The Electronic Frontier Foundation (EFF) has announced the release of the alpha version of an Open Wireless Router firmware. It was officially announced at the HOPE X (Hackers on Planet Earth) conference in New York City. Open Wireless Router is an EFF project that aims to make sharing wireless networks for public use a breeze. And the open wireless router […]