Sahil Chopra sahilchopra

Virtual Hosts on nginx (CSC309)

When hosting our web applications, we often have one public IP address (i.e., an IP address visible to the outside world) using which we want to host multiple web apps. For example, one may wants to host three different web apps respectively for example1.com, example2.com, and example1.com/images on the same machine using a single IP address.

How can we do that? Well, the good news is Internet browsers

Setup Rails application production environment on Ubuntu

Add deploy user

ssh root@YOURDOMAIN
adduser deploy
visudo # Add deploy ALL=(ALL) ALL

Install necessary libraries

#MongoDB 3.2.x Replica Sets on AWS EC2 A MongoDB replica set provides a mechanism to allow for a reliable database services. The basic replica set consists of three servers, a primary, a secondary and an arbitrator. The primary and secondary both hold a copy of the data. The arbitrator is normally a low spec server which just monitors the other servers and help with the failover process. In production, there can be more than three servers.

To setup mongo as a replica set on Amazon Web Services EC2 you need to first setup a security group with ssh on port 22 and mongodb on port 27017. You then need to create three servers. Select Ubuntu 14.04 LTS x64 and a micro (or bigger depending on your database size, ideally you should have enough memory to match your database size) instance for the primary and secondary and a nano instance for the arbitrator.

##Adjust the File System on each Server The operating system by default will update the last access time on a file. In a high data throughput database application

https://gist.github.com/ElioLopez/0b725ab7d64690a6144713f8d66ed6e5

https://www.clickclickdrive.de/fragenkatalog/en/1.1.-danger-teaching/1.1.01-basic-forms-of-traffic-behavior#gsc.tab=0

hard shoulder he hard shoulder, also known as the emergency lane or breakdown lane, is the area to the side of a roadway, usually delimited by a solid white line. It's primarily intended for emergency use, such as stopping in case of a breakdown, vehicle emergencies, or for emergency services to use.

Roadway The roadway refers to the main driving surface of a road or highway, typically delimited by lane markings. It's where vehicles travel, and it's designed and maintained for regular traffic flow.

Lay-by: A lay-by is a designated area along a road where vehicles can pull off to the side to stop temporarily. It's often used for rest breaks, to make phone calls, or to take in scenic views.

	#!/bin/bash

	if [ "$(whoami)" != "root" ]; then
	echo "ERROR : Run script as Root (sudo !!) please"
	exit 1
	fi

	read -e -p "Redis version to be installed (change if needed) : " -i "2.8.2" VERSION
	echo 'Installing redis v.'$VERSION' ... '

	#!/bin/bash

	if [ "$(whoami)" != "root" ]; then
	echo "ERROR : Run script as Root (sudo !!) please"
	exit 1
	fi

	read -e -p "php_redis version to be installed (change if needed) : " -i "2.2.4" VERSION
	echo 'Installing php_redis v.'$VERSION' ... '

	#!/bin/bash

	# Bash script to install latest version of ffmpeg and its dependencies on Ubuntu 12.04 or 14.04
	# Inspired from https://gist.github.com/faleev/3435377

	# Remove any existing packages:
	sudo apt-get -y remove ffmpeg x264 libav-tools libvpx-dev libx264-dev

	# Get the dependencies (Ubuntu Server or headless users):
	sudo apt-get update

	The nginx install process on ubuntu creates a folder at /etc/nginx. In this folder you’ll find a few configuration files, along with a sites-available and a sites-enabled folder. The sites-available folder is where you’ll configure your application-specific nginx setup, and /etc/nginx/nginx.conf is most likely where you’ll configure global nginx settings. The following is a sensibly configured nginx.conf.
	--------------------------------------------------------------------------------------------------------------------



	# Run nginx as www-data.
	user www-data;
	# One worker process per CPU core is a good guideline.
	worker_processes 1;
	# The pidfile location.

	#!/bin/bash
	echo "starting check sidekiq"

	process=`cat /home/ubuntu/staging/wms/shared/pids/sidekiq.pid`

	processConfirmation=`ps aux \| awk '{print $2 }' \| grep $process`

	if [ -z $processConfirmation ]
	then
	echo "oops! not running... restarting sidekiq"

	# to generate your dhparam.pem file, run in the terminal
	openssl dhparam -out /etc/nginx/ssl/dhparam.pem 2048