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‘howto’ Archives

HOWTO: Get a free medium pizza at Papa Johns

HOWTO: Get a free medium pizza at Papa Johns

Browse to Papa John's "Free Medium Pizza" website: papajohns.com Promotion: Certificate good for one medium one-topping pizza on original crust. Additional toppings extra. One coupon per order. One-time use only. Redeemable online only. Online registration required if not a current Papa John's online customer. Offer expires 1/31/2009. Not valid [...]

HOWTO: Setup Network Bonding

HOWTO: Setup Network Bonding

What is bonding? Bonding is the same as port trunking. In the following I will use the word bonding because practically we will bond interfaces as one. But still... what is bonding? Bonding allows you to aggregate multiple ports into a single group, effectively combining the bandwidth into a single connection. Bonding also allows you to [...]

HOWTO: Rebuild failed Linux software RAID arrays

Detecting a drive failure? No mystery there. It's easy enough with a quick glance to the standard logs and stat files to notice a drive failure. /var/log/messages will always fill with a mess of error messages, no matter what happened... but, when it's a disk crash, tons of kernel errors are reported. Some nasty examples (for the [...]

HOWTO: Make a DNS Dead Drop

HOWTO: Make a DNS Dead Drop

Landon Fuller figured out a nice application for Dan Kaminsky's DNS hack -- using DNS servers on the public Internet as "dead drops," with messages stashed on them that can only be retrieved by people with the secret: In each DNS query, 7 bits are reserved for a number of flags, one of which is the Recursion Desired (RD) flag. If set to 0, the [...]

HOWTO: Build a Linux-based supercomputer out of a Playstation 3

HOWTO: Build a Linux-based supercomputer out of a Playstation 3

I'm wondering... what exactly is a supercomputer now-a-days? How fast does it need to be? My feeling was that all modern laptops would be considered supercomputers by 1960s standards, so somebody please fill me in here. This is PhysOrg's post regarding the scientists at the Cluster Workshop, a group funded by the National Science Foundation, [...]

HOWTO: Read flowcharts

HOWTO: Read flowcharts

Today's XKCD swallows its own tail with a great flowchart explaining how to read flowcharts. Source

HOWTO: Broadcast a message to all your linux users

Sometimes as the administrator of a Linux Operating System Server, y may need to send a message to all users in a multi-user system. There are some different ways to do this, but we will now see just one of them. We will use wall. As the main input of wall is a file, we will first create our message file. Let's say you want to tell users [...]

HOWTO: Carry a gun onto an airplane

HOWTO: Carry a gun onto an airplane

Wanna carry a gun onto an airplane? It's easy -- just get any government ID (the cards issued to part-time assistant harbor masters on Cape Cod will do) and then tell the TSA that you need a "flying while armed" form. Not only will they let you bring your gun onto the plane, they'll helpfully bring you into the cockpit (with your gun) and tell who [...]

HOWTO: Detect the Social Sites Your Visitors Use With SocialHistory.js

HOWTO: Detect the Social Sites Your Visitors Use With SocialHistory.js

One of the great things about the web is the relative ease with which one can set up a new service. In social bookmarking alone with have Del.icio.us, Digg, Facebook, Fark, Mister-Wong, Newsvine, Reddit, Technorati, Slashdot, and StumbleUpon, to name a few. That’s great for competition, and that’s great for users, but it’s not so good for [...]

HOWTO: Interview a Linux machine

HOWTO: Interview a Linux machine

Just the other day, a client called upon me to perform a hardware and software inventory on all of the computers on his network. There weren't that many machines to inventory, but we needed to gather quite a bit of information about each one quickly. The client was a Microsoft shop and so I had to deal with about an even mix of Windows XP and [...]

HOWTO: Convert MPEG and AVI to 3gp using FFmpeg

FFmpeg is an excellent FOSS application on video conversion. It supports most of the file formats. ffmpeg ]… { outfile}… Convert from MPG to 3GP ffmpeg -i inputfile.mpg -s qcif -vcodec h263 -acodec aac -ac 1 -ar 8000 -r 25 -ab 32 -y outputfile.3gp Convert from AVI to 3GP ffmpeg -i inputfile.avi -s qcif -vcodec h263 -acodec aac -ac 1 -ar [...]

HOWTO: Create a backup ISO image of your important data

HOWTO: Create a backup ISO image of your important data

Quick Tip: If you want to make a quick backup of a certain directory, ready to be burned on a CD or DVD, you can use mkisofs -V LABEL -r DIRECTORY | gzip > cdrom.iso.gz (replace the italicized sections with your CD label and directory, of course.)

HOWTO: Order pizza from the command line

HOWTO: Order pizza from the command line

Pizza Party is a free text based software package for ordering pizza, or for throwing pizza parties. Pizza Party has many features to make ordering pizza easy: Can order pizza with only a few keystrokes. Can save pizza preferences. Can use batch files for ordering many pizzas. Has easy to use flags for ordering different [...]

HOWTO: Add a Linux server to Windows Server 2003 Active Directory Domain

HOWTO: Add a Linux server to Windows Server 2003 Active Directory Domain

This tutorial will explain how to add a Linux/GNU server/desktop to Microsoft Windows Server 2003 Active Directory.We are going to use Likewise Open. Likewise Open is a free, open source application that joins Linux, Unix, and Mac machines to Microsoft Active Directory and securely authenticates users with their domain credentials. We will be [...]

HOWTO: Make Cocaine

Interesting video of jungle based cocaine factory.

HOWTO: Find your top 10 directories eating up disk space

HOWTO: Find your top 10 directories eating up disk space

To find the 10 largest (filesize-wise) folders in your current working path type: du -cks * | sort -rn | head -10 or du -x --block-size=1024K | sort -nr | head -10 and remember if you just want to know how much free space is available don't forget the classic old df -h command: root@server # df -h Filesystem Size Used [...]

Create an Encrypted Private Directory with eCryptfs

Create an Encrypted Private Directory with eCryptfs

eCryptfs is a kernel-native cryptographic filesystem. It’s also a stacked filesystem, eCryptfs must work on top of another filesystem such as Ext3. This means that you don’t need to allocate space for eCryptfs, it will grow and shrink as you add files to it. eCryptfs will be used in Ubuntu 8.10 to provide an encrypted private [...]

HOWTO: Create a Secret Data Stash with a Fake Phonejack

HOWTO: Create a Secret Data Stash with a Fake Phonejack

While not as grandiose as having your own secret bookshelf door, constructing a hidden USB data stash won't take a whole weekend and involve a table saw. At the DIY website Instructables there is a step by step tutorial on hiding your data behind a phone jack plate. By wiring a USB cord to the phone plate and making a USB cord with a phone jack [...]

HOWTO: Installing Flash Player 10 on 64-bit Linux

HOWTO: Installing Flash Player 10 on 64-bit Linux

I was experiencing some screen tearing on video with Flash Player 9, and thought perhaps giving Flash Player 10 a try would help. It didn’t help much, but here’s how you can install Flash Player 10 yourself using nspluginwrapper on 64-bit Ubuntu. I did this on Hardy Heron, but similar steps will probably apply to previous or new [...]

HOWTO: Bybass Windows 98 ‘s elite security system

HOWTO: Bybass Windows 98 ‘s elite security system

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