Matt Williams

Author's details

Name: Matt Williams
Date registered: August 9, 2008
URL: http://matt@matthewkwilliams.com

Biography

Matt Williams lives in Columbus, OH, in a house filled with computers, cats, books and fiber. Pursuing the goal of being a modern Renaissance person, he plays with his daughter, cooks, roasts coffee, reads, weaves, studies, and hacks, including crazy ideas like a Cloud in a Box. Docker has been an especial passion since June of 2013.

Latest posts

  1. Weaving with Light Pt. 1 — August 31, 2016
  2. Abusing HAProxy: Stupid Simple Easy Dashboards — June 24, 2016
  3. Rules for Operations — April 25, 2016
  4. DevOps Creed (Work in Progress) — April 24, 2016
  5. I am not a Mindreader: a mini-saga — April 11, 2016

Most commented posts

  1. Swarming Raspberry Pi – Part 1 — 13 comments
  2. Docker, Cgroups, Memory Constraints, and Java: A Cautionary Tale, or Here be Reapers (sometimes) — 9 comments
  3. Shrinking Docker Images — 7 comments
  4. Rails & JRuby in a Jar — 7 comments
  5. rspec, restful_authentication, and login_required — 6 comments

Author's posts listings

Sep 16

Docker Volumes Quirk

Categories:

cloud computing, Docker, gotchas

by

When specifying volume paths in a Docker run command, extra slashes can cause things not to work properly.

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Jul 27

Using Openstack/Devstack Floating IPs from outside

Categories:

cloud, cloud computing, gotchas, Openstack

by

I hope that this is of use to someone. After many hours of tearing down, building up, programming routers, etc., I’ve figured out why my devstack wasn’t allowing access from floating ips. I knew that the address was resolving (arp -a); I just couldn’t ssh to it (or do anything else with it) It was …

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Aug 01

Cloudy Update

Categories:

cloud, infrastructure, monitoring, tools, utilities

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I’ve been working with Docker a good bit and have updated my list of tools.  Here’s a quick dump of where I am in the design of the infrastructure. collectd will be used to monitor cgroup statistics.  This necessitates compiling all or part of collectd — the current packages do not contain the cgroup plugin. …

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Jul 23

On demand containers

Categories:

Uncategorized

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I’ve been interested in Linux Containers for quite a while; I think that they have their sweet spot where they are better than virtual instances — in particular they require less resources. I am working on a framework to use linux containers for on-demand computing — increasing or decreasing instances of applications as needed.  I …

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Jun 22

cygwin and torquebox and rvm, oh my!

Categories:

cygwin, gotchas, jruby, tips, torquebox

by

rvm, despite being wonderful, doesn’t play very well with torquebox under cygwin. In particular, the gem paths are not working. So, in order to fix this, simply do: rvm use system And then it will work right. Once you’re done with the torquebox work, you can go back to using rvm.

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Nov 04

JBoss Client Jars for Messaging

Categories:

jboss

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Prior to JBoss 5, the jboss-all-client.jar was pretty much all you needed. However, the JBoss 5 Getting Started Guide states the following: The client/jbossall-client.jar library that used to bundle the majority of jboss client libraries, is now referencing them instead through the Class-Path manifest entry. This allows swapping included libraries (e.g. jboss-javaee.jar) without having to …

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5 comments

Aug 04

rsh hates nohup

Categories:

gotchas, UNIX

by

rsh has issues with nohup. Yes, I know rsh is evil. It wasn’t my decision.

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Jun 09

Torquebox and Cygwin: Take I

Categories:

gotchas, jboss, jruby, rails, torquebox

by

Torquebox and Cygwin don’t work as nicely together as one might hope. That said, here are a couple of findings: In order to deploy, you need to set the $JBOSS_HOME with the Windows path.  You can do this via export JBOSS_PATH=cygpath -w PATH_TO_JBOSS. Additionally, the JRUBY_HOME needs to be a windows path as well.   Otherwise …

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Mar 02

Rails & JRuby in a Jar

Categories:

gotchas, jruby, rails, tips

by

This is a discussion of what I needed to do to put rails and JRuby together in a single jar.

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7 comments

Sep 01

Fractal Terrain Generation

Categories:

programming, ruby, Uncategorized

by

Our map

I’ve been working on a wargaming library/framework off and on for over a year; along the way I’ve encountered a number of interesting problems to solve. This blog entry details one of them, fractal terrain generation.

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