baniol

Running a node application on a local machine is easy - you just execute node app.js or, if you want to ease the development process, you use nodemon or forever. Things get a little bit more complicated when you decide to go live with the app and want it stable on the production server. This post describes how to get your application running as a service on CentOS Linux using init scripts and monit for managing and monitoring it.

Register your app as service - init.d

Let's say you have a nodejs application located on your server in /var/www/myapp and the main script is index.js.

First thing to do is to add your app to init scripts. To do so, create a new file in /etc/init.d and name it after your application.

If you want to learn how to administer a Linux server or have a need to test your application on a specific Linux distribution, a good point of start is to virtualize it locally using VirtualBox. This post explains how get CentOS up and running on OS X. Our goal here is to install minimal Linux server and access it for administration via ssh from your Host operating system. We will also enable the Guest system to act like a web server.

If you don't have VirtualBox already go to download page and install it.

To get an image of CentOS go here and choose the version you want (I went for 6.5) by clicking on x86_64 then pick one of the mirror servers for downloading the desired image (my choice was CentOS-6.5-x86_64-minimal.iso).

Instalation steps.

Run VirtualBox

Clik New.

Maintaining even a small mongodb application in production requires regular backups of remotely stored data. MongoDB gives you three ways to acomplish it. In this post I'm using monogodump command for creating a backup and mongorestore for recreating the data. The purpose of this writing is to provide a simple way of periodic database dumps from a remote server to a Dropbox cloud storage.

Remember that for using mongodump you have to have a mongod process running.

Dumping a database

Suppose that you want make a backup of your books database.

To create a dump use mongodump -d books -o which will result in a book folder containing bson files with all collections.

https://www.digitalocean.com/community/tutorials/how-to-install-ruby-2-1-0-on-centos-6-5-using-rvm

Python 3 & virtualenv(wrapper) : http://www.marinamele.com/2014/07/install-python3-on-mac-os-x-and-use-virtualenv-and-virtualenvwrapper.html

Troubles: http://stackoverflow.com/questions/20170895/mac-virtualenv-pip-postgresql-error-pg-config-executable-not-found

http://stackoverflow.com/questions/7975556/how-to-start-postgresql-server-on-mac-os-x

Install Python on centos:

	// from: http://www.hacksparrow.com/node-js-https-ssl-certificate.html

	$ openssl genrsa -out hacksparrow-key.pem 1024
	$ openssl req -new -key hacksparrow-key.pem -out certrequest.csr
	... bunch of prompts
	$ openssl x509 -req -in certrequest.csr -signkey hacksparrow-key.pem -out hacksparrow-cert.pem

	var https = require('https');
	var fs = require('fs');

	// recursive
	var gcd = function(a, b) {
	if ( ! b) {
	return a;
	}

	return gcd(b, a % b);
	};

	// iterative

	<!doctype html>
	<html>
	<head>
	<script src='//code.jquery.com/jquery-1.7.2.min.js'></script>
	<!-- <script src='//localhost:3000/socket.io/socket.io.js'></script> -->
	<script src='//baniowski.net:3000/socket.io/socket.io.js'></script>
	<script>
	// var socket = io.connect('//localhost:3000');
	var socket = io.connect('//baniowski.net:3000');

	import re

	# open('not_found.log','w').writelines([ line for line in open('allLogs.log') if 'not found' in line])
	fname = 'allLogs.log'
	with open(fname) as f:
	content = f.readlines()

	new = [line for line in content if 'not found' in line]
	filtered = []
	for line in new:

	String.prototype.sanitizeHTML=function (white,black) {
	if (!white) white="b\|i\|p\|br";//allowed tags
	if (!black) black="script\|object\|embed";//complete remove tags
	e=new RegExp("(<("+black+")[^>]>.</\\2>\|(?!<[/]?("+white+")(\\s[^<]>\|[/]>\|>))<[^<>]>\|(?!<[^<>\\s]+)\\s[^</>]+(?=[/>]))", "gi");
	return this.replace(e,"");
	}

	git tag -d 12345
	git push origin :refs/tags/12345