Caktus Blog

We're in the process of updating a web app for a client that was built last year about this time using Django and Photologue. Needless to say, there have been a lot of changes to both over the past year!

As part of my work on EveryWatt, I setup an NFS-based development environment for one of the data loggers we use for energy monitoring in the Caktus office. The stock 2.4 Linux kernel in the machine seemed to have some trouble mounting the file system root I had exported from one of our servers. The symptoms included long delays for most if not all activities that used the file system and lots of messages like these in dmesg:

Motivation & Goal

I sometimes find the admin interface's lists of instances of models overwhelming. The filters and searching helps, but it would be nice to get an overview of the data that is being shown. Particularly I wanted to generate a graph based on the filters selected by the user, so that only items displayed after a filter would be graphed.

Here at Caktus, we use the popular Django web framework for a lot of our custom web application development. We don't use Django simply because it's popular, easy to learn, or happened to be the first thing we found. We've written web apps in PHP, Java, and Ruby on Rails--all before we discovered Django--but were never quite satisfied. Following are just a few of the reasons that we both enjoy working with Django and believe it gives you (the client) the best end-product.

Caktus released minibooks (open-sourced under the AGPL) as a bookkeeping package for small tech agencies. Boasting a double-entry accounting system, customer relationship management (CRM) and transaction reconciliation, minibooks provides a clean, multiuser web-based interface to manage simple accounting needs for small businesses.

One of our non-profit clients recently asked for help entering the numerous business cards they get at trade shows, etc., into their Customer Relationship Management database, a copy of CiviCRM that we setup and manage for them. The best path for entering contacts isn't necessarily obvious from the get-go, but the following procedure is the best we've found and has the lowest up-front investment (you might be able to do something more efficient with a Profile, but that doesn't seem as flexible with respect to matching existing contacts).

In honor of our recent one year anniversary (August 31st), we revamped our web presence to address a couple concerns about the original site:

Tobias already mentioned how Caktus uses Asterisk as our PBX. He also mentioned how we tested various frontends both for managing the asterisk configuration and interacting with asterisk to, for example, check our voicemail. We were inticed by some of the client management solutions that we could plumb up with asterisk. Caktus has a loose administration structure, which allows us to be flexible and not have levels of managers between clients and coders. But, this flexiblility can leave loose ends unchecked when the person in charge of a project is distracted for a day or two. We saw this as an opportunity where Caktus could add a level of group accountability and use some neat technology. We also wanted a tool that would integrate well with our current homegrown DjangoERP/CRM as well as Trac, our prefered tool for project management. So, we decided to write some sweet code.

I was pretty disappointed when I discovered today that Nessus, the security scanner I've used for many years now, had discontinued its free plugin feed. The plugin feed is used to disseminate updated security alerts in an automated fashion to the security scanner, as they become available. The price tag on Nessus' new "Professional Feed": $1200.

One problem with marketing is that it introduces pseudo-false concepts, arbitrarily divorces necessarily wed ones, and leaves out all the gory details. We recently had a client ask us,