alfonsodev

Docker Cheat Sheet

Why

Why Should I Care (For Developers)

"Docker interests me because it allows simple environment isolation and repeatability. I can create a run-time environment once, package it up, then run it again on any other machine. Furthermore, everything that runs in that environment is isolated from the underlying host (much like a virtual machine). And best of all, everything is fast and simple."

TL;DR, I just want a dev environment

alfonsodev

function hex_sha1(s) {
  return binb2hex(core_sha1(str2binb(s), s.length * chrsz));
}

function b64_sha1(s) {
  return binb2b64(core_sha1(str2binb(s), s.length * chrsz));
}

function str_sha1(s) {
  return binb2str(core_sha1(str2binb(s), s.length * chrsz));

alfonsodev

package main

/*
* Script that scrapes google front page
* Usage: ./google [<query>]
* e.g. ./google hacker news
*/

import (
  "fmt"

alfonsodev

Database learning resources

PostgreSQL JSON support

• JSON Type
• JSON Functions and Operators
• JSON Datatype - wiki 9.2
• JSON Additional Functionality - wiki 9.3
• PostgreSQL as a Schemaless Database

alfonsodev

Setting up a SSL Cert from Comodo

I use Namecheap.com as a registrar, and they resale SSL Certs from a number of other companies, including Comodo.

These are the steps I went through to set up an SSL cert.

Purchase the cert

alfonsodev

package main

import (
	"fmt"
	"os"
	"io/ioutil"
	"strings"
	"time"
	"encoding/json"
)

alfonsodev

# References:
#   http://blog.mixu.net/2011/08/13/nginx-websockets-ssl-and-socket-io-deployment/
#   http://blog.exceliance.fr/2012/09/10/how-to-get-ssl-with-haproxy-getting-rid-of-stunnel-stud-nginx-or-pound/
#

global
    nbproc  2
    maxconn 16384

defaults

alfonsodev

# more detailed instructions are at http://dev.iron.io/mq-onpremise/getting_started

# Get a coreos VM up
git clone https://github.com/coreos/coreos-vagrant.git
cd coreos-vagrant/
vagrant up

# get into the coreos box
vagrant ssh

alfonsodev

Google's authentication-less on-the-fly image resizing service

I found it while poking around the Google+ HTML. Jotting down some notes felt like a good idea, so here goes. If you know more about this API, let me know, please!

(Word of warning: I spent ~30 minutes on both my experimentation and this here write-up, so it might not be the most thought-provoking, brilliant thing you read today.)

alfonsodev

This is my response to an email asking about Domain-Driven Design in golang project.

Thank you for getting in touch. Below you will find my thoughts on how golang works with DDD, changing it. This is merely a perception of how things worked out for us in a single project.

That project has a relatively well-known domain. My colleagues on this project are very knowledgeable, thoughtful and invested in quality design. The story spelled out below is a result of countless hours spent discussing and refining the approach.

Conclusions could be very different, if there was a different project, team or a story-teller.

Short story