Category Archive: howto

Mar 21

Swarming Raspberry Pi – Part 1


Here’s the first in a series of building a robust docker swarm of raspberry pi hosts. This installment goes through installing the Pi(s), modifiying the Docker Daemon config, and starting up a test to verify that everyone can join the cluster. The cluster which I am using consists of Raspberry Pi B+ x 5 Raspberry …

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Feb 25

Grabbing Titles & URLs with a Bookmarklet

The following is fixing the wrong problem, but often technology is easier than people problems. $WORK removed the ability to use plugins with Chrome without having to go through a bureaucratic process lasting weeks. One tool I’ve found useful is the ability to copy the title and link of a page to the clipboard and …

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May 14

SSL Joys

The nice thing about standards is that there are so many of them to choose from. Andrew S. Tanenbaum I’ve been working with a Apache proxy to force SSL and https.  Well, I haven’t had any control over the certificates.  And they can come in so many versions, especially given that Microsoft wants to do …

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Sep 22

JRuby + jmx4r + rrd4j == Easy reporting on app servers (part I)

Portion of a JConsole screen

This is a how-to for using jmx and rrd4j, a java implementation of rrdtool, to report on app server statistics. Thanks to Jeff Mesnil(author of jmx4r), Werner Schuster (JMX the Ruby way with jmx4r), sishen (JRobin sucks), and the rrd4j team. You’ll need the following: JVM 1.5 or higher — JRE is not enough, you …

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