Lakshman Diwaakar lakshmantgld

Git Submodules - Basic Explanation

Why submodules?

In Git you can add a submodule to a repository. This is basically a repository embedded in your main repository. This can be very useful. A couple of usecases of submodules:

Separate big codebases into multiple repositories.

FreeBSD 10 Nodejs setup with nginx, mongodb, redis and monit

This my receipe for installing a complete nodejs server on FreeBSD 10. The parameters used in this configuration are for a very small private server that I use for demo purpose only, so for a production server, you should somehow set the limits in pair with your ressources.

I use monit so I don't have to write rc scripts for node and it should take care of process lifecycle management for me. Alternatives exists such as supervisord or circus.

Installing mongodb

JSX Spread Attributes

If you know all the properties that you want to place on a component a head of time, it is easy to use JSX:

  var component = <Component foo={x} bar={y} />;

Mutating Props is Bad, mkay

How to setup AWS lambda function to talk to the internet and VPC

I'm going to walk you through the steps for setting up a AWS Lambda to talk to the internet and a VPC. Let's dive in.

So it might be really unintuitive at first but lambda functions have three states.

No VPC, where it can talk openly to the web, but can't talk to any of your AWS services.
VPC, the default setting where the lambda function can talk to your AWS services but can't talk to the web.
VPC with NAT, The best of both worlds, AWS services and web.

	DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
	Version 2, December 2004

	Copyright (C) 2011 Jed Schmidt <http://jed.is>

	Everyone is permitted to copy and distribute verbatim or modified
	copies of this license document, and changing it is allowed as long
	as the name is changed.

	DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE

	# Here is how to install nvm and node in an Ansible task.
	# I tried a bunch of different things, and as usual it's simple, but you have to get it right.
	# The important part is that you have to shell with /bin/bash -c and source nvm.sh
	---
	- name: Install nvm
	shell: >
	curl https://raw.githubusercontent.com/creationix/nvm/v0.7.0/install.sh \| sh
	creates=/home/{{ ansible_user_id }}/.nvm/nvm.sh

	- name: Install node and set version

	var AWS = require('aws-sdk');

	AWS.config.update({
	accessKeyId: '{AWS_KEY}',
	secretAccessKey: '{AWS_SECRET}',
	region: '{SNS_REGION}'
	});

	var sns = new AWS.SNS();

	PRO:
	- Self documenting. Exploring data becomes trivial.
	- Mobile devs can request everything once
	- Mobile devs only get the data they need
	- You don’t have to know your active record relations.

	CON:
	- You have to manually write all end points
	- Attributes can become bloated. Suppose we make a breaking update to an attribute. The solution is to create a new attribute.

	<!doctype html>
	<html>
	<head>
	<meta charset="UTF-8">
	<title>AWS IoT Pub/Sub Demo</title>
	</head>
	<body>
	<h1>AWS IoT Pub/Sub Demo</h1>
	<form>
	<button type="button" id="connect">connect!</button>

	//
	// Lambda's timeout needs to be >5 seconds, 10 should do
	//

	var startedAt = new Date();

	var interval = setInterval(function () {
	console.log(startedAt, new Date());
	}, 1000);