Whenever a server is accessible via the Internet, it's a safe bet that hackers will be trying to access it. Just look at the SSH logs for any server you use, and you'll surely find lots of "...
SSH is a Swiss Army knife and Hogwart's magic wand all rolled into one simple command-line tool. As often as we use it, we sometimes forget that even our encrypted friend can be secured more than it...
Most of us longtime system administrators get a little nervous when people start talking about DevOps. It's an IT topic surrounded by a lot of mystery and confusion, much like the term "Cloud...

Resurrecting the Armadillo

1999 was a crazy year for business on the Internet, and for Linux. It was when Red Hat went public, with a record valuation, and VA Linux followed with a bigger one. Both were cases in point of the dot-com boom, a speculative bubble inflated by huge expectations of what the Internet would mean for business. more>>

March 2015 Issue of Linux Journal: System Administration

System administration is a very general term. It's our job to fix problems, repair systems and remind people to try power cycling their troubled desktops. more>>

High-Availability Storage with HA-LVM

In recent years, there has been a trend in which data centers have been opting for commodity hardware and software over proprietary solutions. Why shouldn't they? It offers extremely low costs and the flexibility to build an ecosystem the way it is preferred. The only limitation is the extent of the administrator's imagination. more>>

Localhost DNS Cache

Is it weird to say that DNS is my favorite protocol? Because DNS is my favorite protocol. There's something about the simplicity of UDP packets combined with the power of a service that the entire Internet relies on that grabs my interest. Through the years, I've been impressed with just how few resources you need to run a modest DNS infrastructure for an internal network. more>>

Days Between Dates: the Counting

In my last article, we began an exploration of date math by validating a given date specified by the user, then explored how GNU date offers some slick math capabilities, but has some inherent limitations, the most notable of which is that it isn't on 100% of all Linux and UNIX systems. more>>

Multitenant Sites

For some time now, there has been tremendous growth in the world of Web applications. It's quite amazing to see what you can do just via a Web browser—not only can you buy just about anything, but also a growing number of sites offer "software as a service", often abbreviated as SaaS. The idea is that in exchange for a monthly service fee, you get access to a service. more>>

The Usability of GNOME

I work at a university, and one of our faculty members often repeats to me, "Software needs to be like a rock; it needs to be that easy to use." And, she's right. Because if software is too hard to use, no one will want to use it. more>>

Linux for Astronomers

I've looked at specialty distributions that were created for engineers and biologists in previous articles, but these aren't the only scientific disciplines that have their own distributions. So in this article, I introduce a distribution created specifically for astronomers, called Distro Astro. more>>

Elementary, My Dear Linux User

I suspect there are as many Ubuntu-based Linux distributions as there are all other distributions combined. Many of them are designed with a specific purpose in mind. Whether the desire is for a different looking desktop, custom kernel or just pre-installed packages, there's probably a version of *buntu out there to fit every need. more>>

Real-Time Rogue Wireless Access Point Detection with the Raspberry Pi

Years ago, I worked for an automotive IT provider, and occasionally we went out to the plants to search for rogue Wireless Access Points (WAPs). A rogue WAP is one that the company hasn't approved to be there. So if someone were to go and buy a wireless router, and plug it in to the network, that would be a rogue WAP. more>>

Non-Linux FOSS: Homebrew

I use OS X quite often during my day job. I'm able to tolerate it largely due to the terminal. If I couldn't do my work with green text on a black background, I think I'd go crazy (or crazier). Unfortunately, OS X doesn't come with all the command-line tools I need. That's where Homebrew comes in to save the day. more>>

Many Drives, One Folder

RAID is awesome, and LVM is incredibly powerful, but they add a layer of complexity to the underlying hard drives. Yes, that complexity comes with many benefits, but if you just want to spread your files across multiple storage locations, there's a much easier way. more>>

You're the Boss with UBOS

UBOS is a new Linux distro that I like for two reasons. One is that it works toward making it easy for muggles to set up their own fully independent personal home servers with little or no help from wizards. The other is that it comes from my friend Johannes Ernst. more>>

February 2015 Issue of Linux Journal: Web Development

Under Construction

I think it was in the late 1990s, possibly into the 2000s, when it was common to put a cutesy graphic on the bottom of your Web page letting everyone know your site more>>

PostgreSQL, the NoSQL Database

One of the most interesting trends in the computer world during the past few years has been the rapid growth of NoSQL databases. The term may be accurate, in that NoSQL databases don't use SQL in order to store and retrieve data, but that's about where the commonalities end. NoSQL databases range from key-value stores to columnar databases to document databases to graph databases. more>>

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