johnk's blog

Migrating with Data...

It's one thing to upgrade software. It's an entirely different thing to migrate to new software. If you have a whole system of software, integrated in to a mega-app, it's even more difficult.

Script to Compile Videos from JPGs Uploaded from Low-End IP Camera DLINK DCS-932L

This script uses ImageMagick and AVConc (ffmpeg) to convert images uploaded by a low-end DLINK internet camera to an FTP server.

Migrating from Xubuntu to Ubuntu Server

First install ubuntu-desktop and remove xubuntu-desktop

apt-get install --no-install-recommends ubuntu-desktop
apt-get remove xubuntu-desktop

D-Link Switch Power Adapter Barrel Size

I had a couple of these, and lost the power adapters. (OK, someone else lost them, but whatever.) As always, the voltage and current matter, and these guys use 5V 1.2A or 2A.

Discover the IP Address of a Cisco Aironet 1200 Series on Linux without IPSU

I got an Aironet 1200 and didn't have the serial cable, so I tried to use IPSU to find the IP address. I ran it in a VM, bridged the ethernet interface, and it failed.

Idea for a Mobile Augmented Reality App that Plays Site-Specific Audio Clips

I just submitted this idea to some hackathon thing. I wish I hadn't but I did.* The idea is a mobile app that, based on the sensor's location, will play audio files that pertain to the area.

Dell Inspiron is more expensive than Optiplex (updated)

Dell shopping tip:
Similar computers may have very different prices.

Product Key Scheme

This is a concept for a product key activation for a web application. You download the application, install it on the server, and then it will allow you to buy a key via a website.

Lament about IT and Communication of Knowledge

Like a lot of people who work with computers, I have some communication problems. Sometimes, I'm too blunt; other times, too reticent.

Postfix Install Stuff

(argh, forgot to back up my postfix work. i have to start fresh, so this is an opportunity to document work.)

# first get a superuser shell with sudo
sudo -s

apt-get install mailutils

Install Java JDK into /usr/local/bin

There's a zillion ways to do it, and editing $PATH is probably the best, but I didn't want to do that, so I did this:

Limited Email

I've been working on learning postfix and migrating email accounts to it. The service I'm dreaming about is going to be "limited email" and differs entirely from the big email servers.

Paranoid email about "Anti-Christian" Government

I got on a right-wing PAC's email list, and got this.

Dear Fellow American,
The very troops who defend our religious freedom are at risk of having their own taken away.

Learning Javascript via the Read Eval Print Loop (REPL)

All the tutorials out there teach JS by having the user write a file, and load it into the browser.

Javascript APIs and Libraries Change the Game

I was thinking a bit about the JS co-learning thing, and discovered that services, APIs and libraries really change the game, or have changed the game.

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