Free Linux Tutorials

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:

Wondering how blogger website gives you a subdomain from the blogspot.com domain based on  your username of your choice? Well, the concept for this tutorial is somewhat related with it on setting up unlimited subdomains. I’m not sure how do they do it because it could be done by any script, hardcoded or not, thru static or dynamic way via database, many possibilities, and one possible way is thru URL rewriting via Apache’s mod_rewrite.

Requirements of this setup:

a. Apache 2.x or later
mod_rewrite module should be enable.  To check if it’s enabled you should see this line on your httpd.conf

http://www.freelinuxtutorials.com/?mobile or

for Iphone users –> http://www.freelinuxtutorials.com/?iphone

enjoy mobile browsing!

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

One of the most important procedure in setting up master-slave replication on Mysql database successfully is to have a consistent dump or backup of database(s) from the master server by locking all tables during mysqldump so write access is not possible.

master log file and log position will be taken from the master and configure it on the slave server. But it’s not always good times. There are some bad times too. And one of it is sudden stop of your slave and no longer synching with the master database.

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

Fedora 12 has been released,the latest innovative Linux distribution from the Fedora Project, a global, collaborative partnership of free software community members sponsored by Red Hat.

Fedora is a leading edge, free and open source operating system that continues to deliver innovative features to many users, with a new release about every six months. We bring to you the latest and greatest release of Fedora ever, Fedora 12! We have several major new features with special focus on desktops, netbooks, virtualization and system administration.

In relation to this release, I installed Ubuntu 9.10 on my laptop and no issues on wifi or audio of whatsoever using the linux generic, as reference to the previous release as I posted on my old post –>http://www.freelinuxtutorials.com/quick-tips-and-tricks/looping-soundno-audioslow-audio-playback-on-ubuntu/

Oct 29,2009

“The latest version of Ubuntu 9.10 (Karmic Koala) has been released. Offering numerous enhancements for both desktop and server environments, this release includes notable features like Ubuntu Enterprise Cloud images, the Ubuntu One “personal cloud”, and Linux kernel version 2.6.31. Please be sure to use a release mirror close to your geographic location to help reduce the stress on Ubuntu’s primary servers; using BitTorrent for downloads can help alleviate the load even more. If your organization has adequate network and server resources, please consider hosting a mirror as well.”

I’ve been working with the servers most of the time, and few days ago, i had free time to test ubuntu on one of my laptop, it’s not new but not too old either, it’s dual core MSI VR320 and guess what it’s kinda frustrating to have issues on this laptop upon installing ubuntu 8.04 and 9.04.

with 8.04, wifi (using WPA-PSK at home) is not working and sound is looping
with 9.04, wifi is ok but audio playback is damn too slow.

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