Ever since my "tiny $20 tablet" project (see my Open-Source Classroom column in the March 2015 issue), I've been looking for more and more cool things to do with cheap Android devices. more>>
As Linux version 4.0 was released on 15 April, one of the most discussed new features to be included in this release is "no reboot" kernel patching. more>>
In a previous article, I talked about vim macro basics. In that article, I described how to record a custom macro, assign it to a key and then use it to make automated edits to a BIND zone. I also teased that I would cover more advanced uses of macros, like nested macros, in a future issue. more>>
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 Computing" was a few years back. Thankfully, DevOps isn't something sysadmins need to fear. more>>
Thanks to New member homelesspirate we have a cool new face book page up and working please check it out and like us. And many thanks to homelesspirate for taking on this project.
We finally retired the 12.04 team server, and moved to a new 14.04 serverTags: Arizona TeamArizona Team Projects
WhenSat, April 18, 10am – 4pm
WhereUniversity of Advancing Technology: 2625 W Baseline,Tempe, AZ 85283 (between 48th and Fry's) (map)
Description*Who:* Anyone interested in Linux.
*Who* Anyone interested in Linux is welcome. We can just chat or we can install on almost any version of Linux on your computer router server or Raspberry PI or???or fix or learn open source programs in a one on one
*What:* We can install most Linux distributions. We are also happy to fix problems, answer questions or simply discuss free software. We meet the 1st and 3rd Saturday of every month from 10 AM until 4 PM unless we cancel or reschedule due to a holiday. Please see the calendar at http://www.azloco.org/?q=node/28 for more information
We provide power and network connectivity as well as install media. *What to bring:* You must bring everything needed to use your computer (e.g. monitor, keyboard, cords, etc).
Elon Musk is known to be particularly apprehensive about artificial intelligence. Although many of us are both excited and worried about the potential future of AI, most don't need to fear computers taking over in the creative realms of society.
Or do we? more>>
Drupal is a very widely used open-source content management system. It initially was released in 2001, and recent statistics show Drupal as the third-most popular content management system, with just less than 800,000 Web sites utilizing Drupal as a content management system. more>>
No, really! While on a normal day, the word "Microsoft" can be used as an antonym for "Open", the world of .NET seems to be going legitimately open source. more>>
There is a well known story about a scientist who gave a talk about the Earth and its place in the solar system. more>>
For any object moving through a fluid, forces are applied to the object as the fluid moves around it. A fluid can be something like water, or even something like the air around us. When the object is specifically designed to maximize the forces that the fluid can apply, you can designate these designs as airfoils. A more common name that most people would use is a wing. more>>
Recently there was some discussion about ways to ease the tired backs of kernel maintainers. Apparently the merge windows are times of great labor, and some folks wanted to alert contributors to some preferable code submission habits. more>>
I love Bitcoin. It's not a secret; I've written about Bitcoin mining and cryptocurrency in the past. I'm the first to admit, however, that we're at the very beginning of the cryptocurrency age. more>>
First, figure out which hard drive was bad.
To do this, we did this:
look into /proc/mdstat and find out what hard drives are assigned to the raid array. You should be able to identify the drive that is still good. For us the good disk was /dev/sda.
Once we knew it was /dev/sda, run ls -l /dev/disk/by-id. It will show an identification of the disks (usually you could figure out the manufacturer name from there), and linked with it what the drive is referred to /dev/sda, /dev/sdb, etc.). If your drives are from the same manufacturer, you might be able to figure out which one is bad by this command ls -l /dev/disk/by-path. From there, try go figure out what path corresponds to what sata connector. If that still fails, you might need to just pull one of the two disks, and see if your machine boots. If it doesn't, you know that you disconnected the good disk.
Find out the partition size(s) that are raided. We used fdisk /dev/sda, issued the p command to find that out.
Once the bad drive is identified, replace it with a new disk.
Once rebooted, fdisk the new disk.
Create the partition that you want to raid. Make sure its size is the same as you recorded earlier. Make sure that you set its partition type to fe (raid auto detect).
Once formatted, issue the following command as super user
mdadm --add /dev/mdx /dev/sdyz, where you have to replace x and z with the appropriate digits, and y with an appropriate letter.
For example, if the raid array is /dev/md0 and you want to add /dev/sdb1 to the array do this: mdadm --add /dev/md0 /dev/sdb1
You should see the raid array repairing itself by looking at /proc/mdstatTags: Arizona Team
Whatever your opinions about Do Not Track, set them aside for a minute and just look at what the words say and who says them. Individuals—the people we call "users" (you know, like with drugs)—are the ones saying it. In grammatical terms, "do not track" is spoken in the first person. more>>
If you've spent any time around UNIX, you've no doubt learned to use and appreciate cron, the ubiquitous job scheduler that comes with almost every version of UNIX that exists. Cron is simple and easy to use, and most important, it just works. more>>
My Pebble watch has several orders of magnitude more power than the mainframe computers used by NASA to land astronauts on the moon and then get them ba more>>
Typically when a network is under my control, I like my servers to have static IPs. Whether the IPs are truly static (hard-coded into network configuration files on the host) or whether I configure a DHCP server to make static assignments, it's far more convenient when you know a server always will have the same IP. more>>