Van Nguyen vannguyenvietnam

SHORTCUTS

Key/Command	Description
Tab	Auto-complete files and folder names
Ctrl + A	Go to the beginning of the line you are currently typing on
Ctrl + E	Go to the end of the line you are currently typing on
Ctrl + U	Clear the line before the cursor
Ctrl + K	Clear the line after the cursor
Ctrl + W	Delete the word before the cursor
Ctrl + T	Swap the last two characters before the cursor

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

Deploy Rails app to digitalocean with nginx, unicorn, capistrano & postgres

Create droplet of your liking (ubuntu 12.10 x32)

ssh to root in terminal with your server ip

ssh root@123.123.123.123

Add ssh fingerprint and enter password provided in email

Why use UUIDs?

It may seem like a trivial decision at first glance, but using UUIDs can have an intricate effect on your applications design structure. If you are building an application and have an id:integer column that auto increments with the creation of every item you add to that table you could end up with some sever issues. As applications grow in size we end up having to seperate parts of the application into different servers: a cluster of database servers, background, jobs, cache server, an httpd server, and throw in a few servers for actual application and you’ve got a whole cluster of services to deal with.

Lets say you’ve got 3 servers running the actual application, each one chugging along running serveral instances of your web application. Now say it’s a basic CRUD application if you’ve got several instances writing to the database at once you will have a conflict. If you’ve got a table named books and a few rows are being added at once by seperate visitors, you’re auto incrimenting the rows

	sudo apt-get update
	sudo apt-get install build-essential chrpath libssl-dev libxft-dev -y
	sudo apt-get install libfreetype6 libfreetype6-dev -y
	sudo apt-get install libfontconfig1 libfontconfig1-dev -y
	cd ~
	export PHANTOM_JS="phantomjs-2.1.1-linux-x86_64"
	wget https://github.com/Medium/phantomjs/releases/download/v2.1.1/$PHANTOM_JS.tar.bz2
	sudo tar xvjf $PHANTOM_JS.tar.bz2
	sudo mv $PHANTOM_JS /usr/local/share
	sudo ln -sf /usr/local/share/$PHANTOM_JS/bin/phantomjs /usr/local/bin


	# =================== YOUR DATA ========================

	SERVER_NAME="some-server-name"
	SERVER_IP="111.111.11.11"

	USER="someuser"
	SUDO_PASSWORD="secret-password-one"
	MYSQL_ROOT_PASSWORD="secret-password-two"