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Git Best Practices

This is a fairly common question, and there isn't a One True Answer, but still, this represents a consensus from #git

Read about git

Knowing where to look is half the battle. I strongly urge everyone to read (and support) the Pro Git book. The other resources are highly

Namespaces & Cgroups

Introduction to Linux namespaces - Part 1: UTS
Introduction to Linux namespaces - Part 2: IPC
Introduction to Linux namespaces - Part 3: PID
Introduction to Linux namespaces - Part 4: NS (FS)
Introduction to Linux namespaces – Part 5: NET
Bê-á-bá dos cgroups, parte 1: escalonador e prioridades
[Bê-á-bá dos cgroups, parte 2: montagem e "pinning" de CPU](https://www.ibm.com/developerworks/community/blo

Introdução ao Bitcoin

Canais no youtube sobre bitcoin e análise de ações

= Tuning unicorn

unicorn performance is generally as good as a (mostly) Ruby web server can provide. Most often the performance bottleneck is in the web application running on Unicorn rather than Unicorn itself.

== unicorn Configuration

See Unicorn::Configurator for details on the config file format. +worker_processes+ is the most-commonly needed tuning parameter.

Database migration best practices for Rails

Never ever change data on schema changes! [1]

Use rake tasks to change the data! [1]

This decouples a deployment from completed migrations. Give us control of the data manipulation proccess by encapsulatin it in on place. need to remember to:

Run it in one of the ways bellow: a. Add this rake task the deployment script or;

	[CmdLetBinding()]
	Param(
	[Parameter(Mandatory=$true,ValueFromPipeLine=$false,ValueFromPipeLineByPropertyName=$true)]
	[String] $HostedZoneId,

	[Parameter(Mandatory=$true,ValueFromPipeLine=$false,ValueFromPipeLineByPropertyName=$true)]
	[ValidateSet("CNAME","A","AAAA","MX","TXT","PTR","SRV","SPF","NS","SOA")]
	[String] $Type,

	[Parameter(Mandatory=$true,ValueFromPipeLine=$false,ValueFromPipeLineByPropertyName=$true)]

	Set-StrictMode -Version Latest

	$HOSTED_ZONE_ID = "ABCDEFGHIJKLM"


	$changeRequest01 = New-Object -TypeName Amazon.Route53.Model.Change
	$changeRequest01.Action = "UPSERT"

	$changeRequest01.ResourceRecordSet = New-Object -TypeName Amazon.Route53.Model.ResourceRecordSet
	$changeRequest01.ResourceRecordSet.Name = "record01.domain.com"

	aws autoscaling describe-auto-scaling-groups --query 'AutoScalingGroups[*]'

	aws autoscaling describe-auto-scaling-groups --query 'AutoScalingGroups[*].Tags[?Key==`Name`]'

	aws autoscaling describe-auto-scaling-groups --query 'AutoScalingGroups[?Tags[?starts_with(Value, `registration`)]]'

	aws autoscaling describe-auto-scaling-groups --query 'AutoScalingGroups[?Tags[?starts_with(Value, `email`)]]'

	aws autoscaling describe-auto-scaling-groups --query 'AutoScalingGroups[] \| [?contains(Tags[?Key==`Name`].Value, `email-01`)]' --output table

	#!/usr/bin/env bash
	#
	# gh-dl-release! It works!
	#
	# This script downloads an asset from latest or specific Github release of a
	# private repo. Feel free to extract more of the variables into command line
	# parameters.
	#
	# PREREQUISITES
	#

	function drips(){
	docker ps -q \| xargs -n 1 docker inspect --format '{{ .NetworkSettings.IPAddress }} {{ .Name }}' \| sed 's/ \// /'
	}