Free Linux Tutorials

Snort® is an open source network intrusion prevention and detection system (IDS/IPS) developed by Sourcefire.

Other definitions:
- Barnyard is an output system for Snort. Snort creates a special binary output format called unified. Barnyard reads this file, and then resends the data to a database backend. Unlike the database output plug-in, Barnyard manages the sending of events to the database and stores them when the database temporarily cannot accept connections.

-BASE is the Basic Analysis and Security Engine. It is based on the code from the Analysis Console for Intrusion Databases (ACID) project. This application provides a web front-end to query and analyze the alerts coming from a SNORT IDS system.

Relaying to Gmail via smtp.gmail.com can be accomplished by configuring your Postfix with SASL authentication and TLS encryption.

The common errors you will encounter if sending from your postfix mail server failing to gmail.com domain but works in other domains are:

@/var/log/maillog
-Must issue a STARTTLS command first
-certificate verification failed for gmail.com:unable to get local issuer certificate
-Authentication Required. Learn more at 530 5.5.1 http://mail.google.com/support/bin/answer.py?

How to fix?

Assuming you already installed Postfix and everything works fine except sending to gmail smtps, here are the steps to follow:

1. Configure Postfix main configuration

INTRODUCTION

Data backup is the process of making copies of data in order to protect and restore original files whenever data loss happens. Aside from automated routine data backup, this method does not protect against failure and natural disasters. This is where off-site data backup comes in.

OBJECTIVE

To establish an off-site backup of important data such as website and configuration files, and database, by copying and burning it to a removable media via DVD.

Sample Scenario:

We need to backup the webserver files and database, and burn it on DVD disc.

PRE-BACKUP PROCEDURES:

mysql-zrm is short for Zmanda Recovery Manager for MySQL. It lets you create full logical or raw backups of your databases , generate reports about the backups, verify the integrity of the backups, and recover your databases. It can also send email notifcations about the backup status, and you can implement multiple backup policies.

This procedure was successfully tested and implemented on CentOS 5.X and RHEL 5.X servers.
Pre-requisites:
1.mysql client, MySQL server 4.1 and above
2.perl-DBI and perl-XML-Parser
yum install perl-DBI perl-XML-Parser

Installation:

1.Download mysql-zrm on http://www.zmanda.com/download-zrm.php
2.Get the RPM
wget http://www.zmanda.com/downloads/community/ZRM-MySQL/2.1.1/RPM/MySQL-zrm-2.1.1-1.noarch.rpm
3.Install
rpm -ivh MySQL-zrm-2.1.1-1.noarch.rpm

Tomcat,known as Apache Tomcat or Jakarta Tomcat is a servlet container developed by ASF or Apache Software Foundation. It implements the JavaServer Pages (JSP) and Java Servlet specifications from Sun Microsystems. To make it simple, it is use as a java http web server environment where you can run your Java code.

This is a brief tutorial on installing and running tomcat in Linux.

Prerequisites:
Java SDK should be installed.

Tested in CentOS 5.X

1. Download Java SDK from sun.com website

http://java.sun.com/javaee/downloads/index.jsp

In this tutorial, we will be using Java EE 5 SDK

Obviously, this is really an old procedure, actually this is my documentation way back early 2006 when it’s my first time to work with asterisk. This procedure was implemented before in about 30-50 call center agents using softphones and it quite worked well.

So many things have changed, as we all know, from asterisk 1.2 to asterisk 1.6 , and Asterisk Management Portal is popularly known now as FreePBX. Other packages were also updated now, many changes but still asterisk is standing there as the best open source telephony system.  We had many community and commercial PBX softwares today that are asterisk-based, that’s how big asterisk right now comparing back 2006

There’s an easy way of installing Apache, Mysql and PHP and it’s via yum. You can install or update httpd,mysql-server and php, php-mysql and some minor changes on your configuration files and you’re good to go. Well, the procedure below is one way to install also, if you’re quite bored and want to develop your sysadmin skills.

I. Operating System Installation

1.    The typical type of installation is thru  CD-ROM or DVD. If you want network install, you should have a CentOS boot disk to boot the server

Do you want a free Web Conferencing? Then you can try DIMDIM.
Dimdim lets anyone deliver synchronized live presentations, whiteboards and web pages and share their voice and video over the Internet – with no download required

Official Dimdim Website:  www.dimdim.com

You can try the Open source Community Edition.

This is based on Dimdim Installation Procedure for CentOS

This step-by-step procedure was tested and implemented successfully on CentOS 5.2 32 bit (64 bit won’t work since the dimdim installation pack is for 32-bit only)

Requirements

1. Wonder why you can’t send email from your linux server?

2. Is your mail server or 3rd party email hosting provider requires authentication for your outgoing server to send out emails successfully?

3. Are you using a default sendmail email client on your linux box and wonder why your getting maillog errors such as this:

——-sample sendmail maillog error from my nagios server—————
Oct  2 17:03:54 nms sendmail[25657]: n9293qiw025655: to=<nagios@freelinuxtutorials.com>,

ctladdr=<root@nms.freelinuxtutorials.com> (0/0), dela0928, relay=smtp.freelinuxtutorials.com.

[216.200.145.17], dsn=5.1.1, stat=User unknown
Oct  2 17:03:54 nms sendmail[25657]: n9293qiw025655: n9293siw025657: DSN: User unknown
Oct  2 17:03:54 nms sendmail[25657]: n9293siw025657: to=<root@nms.freelinuxtutorials.com>,

Assuming you already have mysql server installed on your machine, the reason you are
installing phpmyadmin is to ease  your administration of  your MySQL like database creation and deletion, create/alter/drop/view tables and execute any SQL statements, privilege and trigger management, stored procedures, and backup/ maintenance

phyMyAdmin is a tool built in PHP to manage and administer your MySQL servers via your browser.

Requirements:

1.PHP
2.MySQL
3.php-mysql
4.gd/gd-devel
5. Apache