Open Source Software in Data Centres

“In general, enterprises are using open source in the following three primary areas: Web presence and portals, the small to medium-size database tier and the application tier”^[1]
‐ James Staten, Analyst, Forrester Research Inc.

MySQL	PostgreSQL
The Governance model is not open source	PostgreSQL Global Development Group fully licensed open-source
FreeBSD OS support	HP-UX support

MySQL	PostgreSQL
Replication is master-master, but can also support master-slave	Replication properties are same as MySQL along with added modes of replications possible with 3rd party extensions

MySQL	PostgreSQL
MySQL Cluster to perform horizontal clustering	Doesn't implement true partitionings
	More access methods such as the platform's native C library

AJAX

an example: on the html side

<!DOCTYPE html>
<html>
<body>

<div id="demo">
  <h2>Let AJAX change this text</h2>
  <button type="button" onclick="loadDoc()">Change Content</button>
</div>

</body>
</html>

AJAX

an example: AJAX snippet

function loadDoc() {
  var xhttp = new XMLHttpRequest();
  xhttp.onreadystatechange = function() {
    if (this.readyState == 4 && this.status == 200) {
     document.getElementById("demo").innerHTML = this.responseText;
    }
  };
  xhttp.open("GET", "ajax_info.txt", true);
  xhttp.send();
}

Awesome Source

Open Source

Open Source Software in Data Centres

Why?

but, How?

Open Source Software in Cloud Computing

Web Presence

Apache

Jetty

Zend Framework

Database Tier

MySQL

PostgreSQL

A quick diff

A quick diff

A quick diff

Application Tier

Zope

Plone

AJAX

AJAX

an example: on the html side

AJAX

an example: AJAX snippet

AJAX

a courtesy of Sweet Alert 2^MIT

Apache Struts

System and Network Management Tier

Nagios

NetXMS

Pandora FMS

Cacti

Hyperic

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