What do Clocks, Cars, and Warships have in Common?
A few months ago we had Daylight Savings Time. My parents were delighted to discover that “the clock” in their car automatically adjusted itself, as did their computer. But now they had to change the two clocks in their bedroom, the two clocks in the kitchen, and several others around the house. How did the […]
What’s Happening To The CompTIA Security+ Exam?
I recently taught Learning Tree’s CompTIA Security+ test-prep course and a student asked a question I couldn’t answer. This wasn’t a technical question. If it had been, I would have known the answer or else I could have found it. But he asked: “Look, I do desktop support. I help set up and move desktop […]
Using Linux Containers and Docker for Reliable Service
From time to time, I need to access the web server belonging to a company I do some work for. It’s only used by their employees plus consultants like me, so it’s pretty basic. Just enough to get the job done. The main page carries this warning: This web site will be down for maintenance […]
Avoid Graphical Slowdowns
The top program displays a constantly updated list of running processes ordered, by default, by CPU usage. The name comes from its intended use – display the processes that are the top users of system utilization. The joking explanation, is that it’s called “top” because it’s always at or near the top of its own […]
Should We Worry About Virtual Disk Fragmentation?
Recently, I explained about qcow2 or QEMU Copy-On-Write v2 and some performance trade-offs for virtual disks. One thing that might alarm you is the appearance of a high percentage reported fragmentation on compressed qcow2 disks. Don’t worry, this isn’t what you probably think! That’s all you really need to know, keep reading if you want […]