Nazar wavedocs

#Letsencrypt Ubuntu 14.04 Nginx Letsencrypt (https://letsencrypt.org) is an initative which aims to increase the use of encryption for websites. It basically allows people to apply for free certificates provided that they prove the they control the requested domain.

Note: As of 8th March 2016 letsencrypt is still in public beta.

##Installation To install the client, clone the repostiory from github.

git clone https://github.com/letsencrypt/letsencrypt.git

File activity

strace -e trace=file -fp PID (file) or strace -e trace=desc -fp PID (file descriptors)

Common calls:

access
close – close file handle
fchmod – change file permissions
fchown – change file ownership

SSH Two Factor Authentication

Install ssh server

sudo apt-get install openssh-server

Configure SSH server

First make a backup copy of the original config

sudo cp -a /etc/ssh/sshd_config /etc/ssh/sshd_config_backup

#S3 Make Bucket Public

This comes from an excellent post from Gregory Schier.

By default, files uploaded to Amazon S3 are private, requiring a separate action to make public. To make uploads default to public, add this policy to your S3 bucket.

{
  "Version": "2008-10-17",
 "Statement": [{

S3Cmd - S3 Command Line Tools

S3cmd is a free command line tool and client for uploading, retrieving and managing data in Amazon S3 and other cloud storage service providers that use the S3 protocol, such as Google Cloud Storage or DreamHost DreamObjects. It is best suited for power users who are familiar with command line programs. It is also ideal for batch scripts and automated backup to S3, triggered from cron, etc.

S3cmd is written in Python. It's an open source project available under GNU Public License v2 (GPLv2) and is free for both commercial and private use. You will only have to pay Amazon for using their storage.

It is available on http://s3tools.org/s3cmd

Installing S3Cmd

DigitalOcean Ubuntu 14.04 x64 + Rails 4 + Nginx + Unicorn + PostgreSQL + Capistrano 3

Create a Droplet

SSH into Root

$ ssh [email protected]

Change Root Password

	# Stream a video
	ffmpeg -re -i video.avi -vf "scale=40:ih*40/iw, crop=40:16" -f rawvideo -vcodec rawvideo -sws_flags bilinear -pix_fmt rgb24 - > /dev/udp/matelight.cbrp3.c-base.org/1337

	# Loop a gif
	ffmpeg -re -ignore_loop 0 -i image.gif -vf "scale=40:ih*40/iw, crop=40:16" -f rawvideo -vcodec rawvideo -sws_flags bilinear -pix_fmt rgb24 - > /dev/udp/matelight.cbrp3.c-base.org/1337

	# Stream webcam
	# Mac
	ffmpeg -re -f avfoundation -r 30 -s 1280x720 -i "0" -vf "scale=40:ih*40/iw, crop=40:16, pp=autolevels:f, eq=1.5" -f rawvideo -vcodec rawvideo -sws_flags bilinear -pix_fmt rgb24 - > /dev/udp/matelight.cbrp3.c-base.org/1337

	# pdnsutil create-zone example.com ns1.example.com
	Creating empty zone 'example.com.'
	Also adding one NS record
	# pdnsutil add-record example.com ns1 A 192.168.1.2
	New rrset:
	ns1.example.com. IN A 3600 192.168.1.2

	# pdnsutil list-zone example.com
	example.com. 3600 IN NS ns1.example.com.
	example.com. 3600 IN SOA ns1.example.com hostmaster.example.com 1 10800 3600 604800 3600

	# You don't need Fog in Ruby or some other library to upload to S3 -- shell works perfectly fine
	# This is how I upload my new Sol Trader builds (http://soltrader.net)
	# Based on a modified script from here: http://tmont.com/blargh/2014/1/uploading-to-s3-in-bash

	S3KEY="my aws key"
	S3SECRET="my aws secret" # pass these in

	function putS3
	{
	path=$1

	#!/bin/bash
	#
	# Argument = -u user -p password -k key -s secret -b bucket
	#
	# To Do - Add logging of output.
	# To Do - Abstract bucket region to options

	set -e

	export PATH="$PATH:/usr/local/bin"