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Author Archives: jrwren

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Setup a New Mac

A couple years later, and I find myself referring to my own guide But in a different order of important things. 0. Caps Lock key is a Control key, Preferences->Keyboard, fix that, while I’m there, remove some of the -F keys from being bound, I’m going to need apps to see them. 1. I NEED […] Read More »

Leaving a Great Job for a Great Job

Today was my last day as an employee at Arbor Networks. Leaving  Arbor Networks was a tough decision. There are so many good people and interesting problems at Arbor. When I was approached by folks, I said, “I’m not done working on stuff at Arbor.” The work, people, culture and environment really are that fun […] Read More »

Getting a Windows Password for EC2 Instance

… without pasting your private key to ec2. EC2 should never see your private key… because.. security! I launched a Windows Server 2012 R2 instance in EC2 recently and while the AWS console does let you retrieve an Administrator password, it requires you to paste your PRIVATE key to AWS console to do it. I […] Read More »

GNU date luxuries

http://www.cyberciti.biz/tips/linux-unix-get-yesterdays-tomorrows-date.html Has a pretty good summary of using GNU date’s strtotime implementation. strtotime.y is an interesting piece of code. Its often reproduced and imitated. The header says Originally written by Steven M. Bellovin <smb@research.att.com> while at the University of North Carolina at Chapel Hill.  Later tweaked by a couple of people on Usenet.  Completely overhauled […] Read More »

finding files by date

I got tired of looking this up every time, and I’ve not seen anyone write about this specific use case. When dealing with dev servers in the cloud, sometimes I forget the use case for one. I find it useful to be able to find all the changed files on a system by date. find […] Read More »

Book Review: BeagleBone Robotics Projects

I was asked by Packt Publishing if I would read and review this book. I’ve owned a BeagleBoneBlack for a little while now. My use case was not robotics. This book might shed some new light on my old Black, so I agreed to review it. The book starts off very accessible. Chapter 1 covers just […] Read More »

Blocking Unwanted Internet Traffic 101

I recently came across this very suggestion on serverfault which starts with blocking spoofed packets. I’m addressing on the first block of rules here. http://serverfault.com/a/410618/79028 It is a simple iptables ruleset which blocks most of the common rfc1918 addresses. You have probably heard of these, the 10/8, 192.168/16 and 172.16/12 address ranges. What might be […] Read More »

zlib stream python oneliner

I ran across a zlib stream, which is like a gzip file, but without the gzip header. I wanted to decompress it and piping through gunzip doesn’t work because of the missing header. Python to the rescue! | python -c ‘import sys,zlib;print zlib.decompress(sys.stdin.read())’ That was easy. Read More »

Converting your existing ssh rsa key for use with Windows Azure

Oh Microsoft, it seems like you make simple things complex. I could not find anything on converting an existing ssh key for use with Azure. Once I figured out what was needed and the commands available to me, it was easy. It only took me hours of fiddling with ssh-keygen and openssl. The magic was […] Read More »

Jay R. Wren – lazy dawg evarlast 2013-07-29 10:05:39

I recently read a post by someone lamenting the thanklessness a programmer gets. I once worked in IT where services are really considered a utility. No one calls the utility company unless there is a problem. Have you ever called your electric, phone, or gas company to thank them for the great service? I didn’t […] Read More »

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