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Caching in PHP using the filesystem, APC, Memcached and Redis.

Cache per script data in associative array.

If you have some data read from database which you need several time during page creation cache it locally do not depend on any other types of caches.

use APC Cache for single node applications

If you have just one web server or your data set is small so it fits in memory in each of the servers APC Cache may be the most efficient way for you to cache the data.

Use Memcached for large scale applications

If local node cache is not large enough to cache good amount of data caching on network by using memcached is very good way to go.

	Summary
	=========
	1) Create an A record for your sub-domain that points to your droplet
	2) Create a .config file for your sub-domain site in /etc/apache2/sites-available
	3) Create the directory for your site in /var/www (or wherever you said it was in the config file)
	4) Enable the site in apache with: sudo a2ensite sub.yourdomain.com (or whatever you named your site in the config)
	5) reload apache: sudo service apache2 reload
	NOTE: the DNS record you create might take awhile to propagate
	============================================================================================

	<!DOCTYPE html>
	<html>
	<head>
	<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
	<style type="text/css">
	html, body { height: 100%; margin: 0; padding: 0; }
	#map { height: 100%; }
	</style>
	</head>
	<body>

	// required libraries
	jimport('joomla.image.image');
	jimport('joomla.filesystem.folder');
	jimport('joomla.filesystem.file');
	/**
	* Function to create thumbs from one image
	* @author Roberto Segura - Digital Disseny, S.L.
	* @version 16/07/2012
	*
	* @param string $imgPath - path to full image

	How To Limit MySQL Max Connections Per User
	Ref: https://www.rackaid.com/blog/mysql-connection-limits/

	Understanding max_user_connections
	http://dev.mysql.com/doc/refman/5.7/en/user-resources.html


	function getHasChanges() {
	var hasChanges = false;

	$(":input:not(:button):not([type=hidden])").each(function() {
	if ((this.type == "text" \|\| this.type == "textarea" \|\| this.type == "hidden") && this.defaultValue != this.value) {
	hasChanges = true;
	return false; // returning false from this callback will break the each looping
	} else {
	if ((this.type == "radio" \|\| this.type == "checkbox") && this.defaultChecked != this.checked) {

	scp user@source user@destination -uUserName -pPassword

	/* for digital ocean, one has to change ownership for a newly uploaded content as below */
	chown -R www-data:www-data /var/www/html
	/* www-data:www-data is the default user:group for web server */


	Other scp example ref:http://www.hypexr.org/linux_scp_help.php
	===============================================================
	Example syntax for Secure Copy (scp)

	Configuring SPF and DKIM for outgoing mail digital signing
	https://www.exratione.com/2014/07/setting-up-spf-and-dkim-for-an-ubuntu-1404-mail-server/
	Ref: http://www.openspf.org/SPF_Record_Syntax
	Ref: http://www.dkim.org/

	If Postfix not installed
	https://www.digitalocean.com/community/tutorials/how-to-install-and-setup-postfix-on-ubuntu-14-04
	https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-postfix-as-a-send-only-smtp-server-on-ubuntu-14-04

	MX tool:

	Create new droplet (1 click application or manual e.g. LAMP stack)

	Step 1: Create a new user
	Step 2: Root privileges
	Step 3: Add Public Key Authentication
	Step 4: Disable remote SSH access to root account
	Step 5: Testing the changes
	Step 6: Configure time zones
	Step 7: Configure NTP Synchronization
	Step 8: Setting up a firewall