Author Archive

Sending bulk emails with Postfix and Haproxy

Scale UP Postfix servers The ever increasing business complexity demands the need of sending bulk emails. Typically the MTA’s available nowadays are not capable of sending emails at rate which a business organization actually needs. There only few exceptions available such as PowerMTA but they will cost you a lot of money. This article will [&hellip

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Block DDOS with Haproxy and Nginx

Layer 4 and Layer 7 attcks Those who experienced DDOS attacks knows how hard it is to mitigate them. Well this tutorial is not going to concentrate on mitigating a DDOS attack completely, but blocking Layer 7 attacks on application layer with upto 100000 simultaneous connections. When you receive a layer 4 attack that counts [&hellip

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DKIM and SPF Setup in Postfix:-

Enabling SPF checks in Postfix:- SPF is an e-mail anti-forgery technology the enables domain owners to list, in the Domain Name Service (DNS), authorized sources of mail from their domains. It enables mail receivers to reject mail that does not come from authorized sources. Package installation:- Install the following package in the server. Integrating with [&hellip

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Top 25 apt commands in linux

The Advanced Packaging Tool, or APT, is a free user interface / command line tools that works with core libraries to handle the installation and removal of software on the Debian GNU/Linux distribution and its variants. APT simplifies the process of managing software on Unix-like computer systems by automating the retrieval, configuration and installation of [&hellip

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Install and Configure Postfix mailserver

Postfix is a free and open-source mail transfer agent (MTA) that routes and delivers electronic mail, intended as an alternative to the widely used Sendmail MTA. Postfix is released under the IBM Public License 1.0 which is a free software license. Postfix consists of a combination of server programs that run in the background, and [&hellip

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Amazon Virtual Private Cloud: Basics

What is Amazon VPC? Amazon Virtual Private Cloud (Amazon VPC) enables you to launch Amazon Web Services (AWS) resources into a virtual network that you’ve defined. This virtual network closely resembles a traditional network that you’d operate in your own data center, with the benefits of using the scalable infrastructure of AWS. Amazon VPC is [&hellip

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Openfire Instant Messaging System

Openfire  is an open source real-time collaboration (instant messaging) server, built on the XMPP protocol  and available for multiple platforms. This guide will help you get started with Openfire on your Ubuntu 12.04. Before starting the installation of openfire in your ubuntu machine, update you repositories using the “apt-get update” command. Openfire required Java Runtime [&hellip

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MySQL Replication

MySQL replication is the process that allows you to maintain multiple copies of the data by copying the data from the master server to salve server. MySQL replication is useful in many ways including the backup of the data, analyzing the database without using the main database etc. This documentation will give you the basic [&hellip

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