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Database Transactions with Perl To understand what is a database transaction lets look at a simple bank withdrawal and deposit scenario. Assume that you have two bank accounts call A and B, and you need withdraw some amount from account A and Deposit it on account B. In this scenario what happen if you couldn't withdraw money from your account A, the deposit part won't carry out. Again if you couldn't deposit the money to your account B you have to deposit them back on account A (Which means a roll back). So in the  context of Database, Transaction is refer to  a sequence of jobs which is supposed to run as a whole. So in other words, it should happen as whole or not. So as in our following example, we have 3 Database queries which should perform as a whole. Further assume that our first Database query is supposed to perform a insert if successful, second query  should update a table if successful, third query  should delete an entry from a ...

Asterisk Gateway Interface 1. What is Asterisk Gateway Interface?  In simple word AGI is Language Independent API to programmers to control the call flow on their Asterisk PBXs. Asterisk provides more than its own dial-plan, to control to the call flow or lets say call logics. So which means you may use either one of Dialplan Asterisk Manager Interface (AMI) Asterisk Gateway Interface (AGI) to manipulate your call logics. Before we move on to AGI lets briefly discuss about each one of above, Dialplan Dial plan is Asterisk native call logics performer, it's fast, easy to learn and efficient. But this configuration script is more closer to assembly program (If you have any previous experience on assembly), the main drawback of the Asterisk Dialplan in it's lack of support on standard procedural  language as an example when you want create a loop.  Any way in the following tutorials we will only discuss about the AGI, But we can't av...

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Root Password recovery In this tutorial I will demonstrate you how to recover you lost password. This tutorial is for RHEL 7 Password recovery. Before we go further I would like to brief Linux boot process, When pushed power button your PC/Server it will powered on and the system firmware will runs POST (Power On Self Test) which will check and initiate attached hardware. You can do modifications to these process by BIOS/UFFI configuration After POST, system firmware will look for bootable device in other words it look for Master Boor Record (MBR) Then the System will reads the boot loader from the disk and let boot loader to take control of the system Now the boot loader loads its configuration from disk, at that point you may display the boot options Depends on your selection boot loader will load the kernel and initramfs from disk to you memory(RAM). Initramfs  is some gziped archive contains kernel modules for hardware all hardware w...

This Document covers asterisk basic installation on docker. Since till now there is no official asterisk image on Docker hub we will use Debian core to install the asterisk. Prerequisites Linux host to install docker, Internet connectivity and docker account to download docker images. 1. Installing Docker (Ensure your Internet connectivity) Centos 7           #wget http://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm           #rpm -ivh epel-release-latest-7.noarch.rpm           #yum install docker  Install Docker on RHEL and CentOS 6          # yum install epel-release          # yum install docker-io 2. Start Docker Centos 7          # systemctl start docker          # systemctl status docker          # systemctl enable docker ...