Daniel dcalixto

Linux Performance Tweaks

yaourt -S android-sdk android-sdk-platform-tools android-sdk-build-tools
Note: Maybe you'll have problems with the lasta package: ncurses5-compat-libs. In order to avoid this problem you have to use this command: gpg --recv-keys F7E48EDB. You can find clarification here.
yaourt -S genymotion
Note: You'll need install virtual-box and his modules, yaourt will make for you but you need choos between ArchLinux host modules or DKMS host modules.
Enter in super user mode with su - and then do echo -e "vboxdrv\nvboxnetflt\nvboxnetadp\nvboxpci" > /etc/modules-load.d/virtualbox.conf
Note: You need do this with super user because need super user permissions and with sudo, for us at least, doesn't work.
sudo modprobe vboxdrv vboxnetadp vboxnetflt
Activate for current session.
sudo chmod -R 777 /opt/android-sdk

Install Android SDK on Arch Linux

1. Download Android SDK on your computer

yaourt android-sdk-platform-tools
yaourt android-udev
yaourt android-sdk

2. Create global variables on system

System Updates

http://bookofzeus.com/harden-ubuntu/initial-setup/system-updates/

Keeping the system updated is vital before starting anything on your system. This will prevent people to use known vulnerabilities to enter in your system.

sudo apt-get update
sudo apt-get upgrade
sudo apt-get autoremove
sudo apt-get autoclean

Install and configure Sendmail on Ubuntu

This should help you get Sendmail installed with basic configuration on Ubuntu.

If sendmail isn't installed, install it: sudo apt-get install sendmail
Configure /etc/hosts file: nano /etc/hosts
Make sure the line looks like this: 127.0.0.1 localhost yourhostname
Run Sendmail's config and answer 'Y' to everything: sudo sendmailconfig
Restart apache sudo service apache2 restart

Preface

Below are the steps I took to install ffmpeg, ffmpegthumbnailer, and heroku to use with carrierwave-video and carrierwave-video-thumbnailer gems on my heroku app. I found there was no documentation to do exactly this, so I hope this is helpful for other people (and will save them the countless hours it took me to finally get it to work)

carrierwave-video gem: https://github.com/rheaton/carrierwave-video
carrierwave-video-thumbnailer gem: https://github.com/evrone/carrierwave-video-thumbnailer

These are the libraries you will end up installing to get all of this to work.

x264

PSQL

Magic words:

psql -U postgres

Some interesting flags (to see all, use -h):

-E: will describe the underlaying queries of the \ commands (cool for learning!)
-l: psql will list all databases and then exit (useful if the user you connect with doesn't has a default database, like at AWS RDS)

#Simple Authentication with Bcrypt

This tutorial is for adding authentication to a vanilla Ruby on Rails app using Bcrypt and has_secure_password.

The steps below are based on Ryan Bates's approach from Railscast #250 Authentication from Scratch (revised).

You can see the final source code here: repo. I began with a stock rails app using rails new gif_vault

##Steps

	/* Shadow 0dp */
	box-shadow: none;

	/* Shadow 1dp */
	box-shadow: 0 1px 1px 0 rgba(0,0,0,0.14), 0 2px 1px -1px rgba(0,0,0,0.12), 0 1px 3px 0 rgba(0,0,0,0.20);

	/* Shadow 2dp */
	box-shadow: 0 2px 2px 0 rgba(0,0,0,0.14), 0 3px 1px -2px rgba(0,0,0,0.12), 0 1px 5px 0 rgba(0,0,0,0.20);

	/* Shadow 3dp */

	## I imagine this could be done in the migration, but it was giving me problems so I moved it to the model
	## and just did it on the command line

	> Tag.reset_questions_count