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Rails naming conventions

General Ruby conventions

Class names are CamelCase.

Methods and variables are snake_case.

Methods with a ? suffix will return a boolean.

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#Heading 1 ##Heading 2 ###Heading 3 ####Heading 4 #####Heading 5 ######Heading 6

---

Paragraph

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Example inputs:

Variable	Value
key	the shared secret key here
message	the message to hash here

Reference outputs for example inputs above:

| Type | Hash |

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#!/bin/bash
#
# Ubuntu post-install script
#
# Author:
#   Marco Rougeth <marco@rougeth.com>
#
# Description:
#   A post-installation bash script for Ubuntu (13.10)
#

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Deploying a simple Rails application with AWS Elastic Beanstalk by Julien SIMON, Principal Technical Evangelist @ Amazon Web Services

18/02/2016   
http://www.slideshare.net/JulienSIMON5/deploying-a-simple-rails-application-with-aws-elastic-beanstalk
    
    1. . Create a Git repository with AWS CodeCommit 
      $ aws codecommit create-repository --repository-name blog --region us-east-1 --repository-description "ElasticBeanstalk demo" 
      $ git clone ssh://git-codecommit.us- east-1.amazonaws.com/v1/repos/blog
    
    2. Create a new Rails application

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#!/usr/bin/env sh

# checks to see if running 
launchctl list | grep elasticsearch
 
launchctl unload ~/Library/LaunchAgents/homebrew.mxcl.elasticsearch.plist
launchctl remove homebrew.mxcl.elasticsearch

pkill -f elasticsearch

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Over the weekend I spun up a new Elixir :ecto, "2.2.7" project that I was able to get working with CockroachDB and this adapter fork - with some caveats I wanted to share to help others.

1. Only the root user can create databases This requires you configure the Ecto.Adapters.Postgres username as root or else the mix ecto.create command will always fail. You can go back and change your configured username to something else after the database has been created, or create your database and user permissions using cockroach sql and skip the mix ecto.create command.

2. Configuring Ecto primary_key ID to be created by CockroachDB By default when configuring your Ecto.Schema using autogenerate: false it appears either CockroachDB, Ecto or the Postrex adapter (I did not investigate this) uses the BIGINT unique_rowid() function as the default value for IDs

@primary_key {:id, :id, autogenerate:

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#! /bin/bash

# Shell script to install apache/mysql/php/wordpress into an EC2 instance of Amazon AMI Linux.
# Step 1: Create an AWS EC2 instance
# Step 2: ssh in like: ssh -v -i wordpress.pem ec2-user@ec2-54-185-74-0.us-west-2.compute.amazonaws.com
# Step 3: Run this as root/superuser, do sudo su

echo "Shell script to install apache/mysql/php/wordpress into an EC2 instance of Amazon AMI Linux."
echo "Please run as root, if you're not, choose N now and enter 'sudo su' before running the script."
echo "Run script? (y/n)"

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Latency Comparison Numbers

Note: "Forked" from Latency Numbers Every Programmer Should Know

Event	Nanoseconds	Microseconds	Milliseconds	Comparison
L1 cache reference	0.5	-	-	-
Branch mispredict	5.0	-	-	-
L2 cache reference	7.0	-	-	14x L1 cache
Mutex lock/unlock	25.0	-	-	-

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S3 Static Sites

What this will cover

• Host a static website at S3
• Redirect www.website.com to website.com
• Website can be an SPA (requiring all requests to return index.html)
• Free AWS SSL certs
• Deployment with CDN invalidation

Resources