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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 ...

FreePBX-Installation 1. Pre-installation In order to setup call center server first we have to confirm that our system is full filled the minimum requirements. This asterisk deployment is based on RedHat distribution aka CentOS.  To full-fill the above requirement we are going to setup asterisk 11 on CentOS 6.5 (x64). 1.2 CentOS 6.5x64 installation  It is recommended to install CentOS 6.5x64 minimum version and manually install all the other package as our requirement.  At the beginning it recommended to configure the logical disk drives aka Raid.  Note that some of the server-rigs will not compatible to centos 6.5x64, most of the time it’s because the particular server’s Raid drivers might not be found in centos 6.5x64 disk. In such scenario please follow the below instruction. First we have to download the Raid driver from relevant vendor. (If it’s HP you will find somewhat like this hpvsa-X.X.X-X.rhel6u.5x86_64.dd). ...

SIP SIP standards for Session Initiation Protocol and It's Purely IP based.  BRI/PRI PRI stands for Primary Rate Interface and It contains One 64Kbps T1 or E1 Chanel for Signaling AKA Channel D and 23 T1 or 30 E1 Channels as Bearing Chanel aka Channel B.\ BRI standards for Basic Rate Interface and Contain Two Barer channel and One Signaling Chnnel AKA 2B+D. Further Both Both PRI and BRI are ISDN services and also data rate of PRI is 2.048Mbps while 128-144Kbps. ISDN : Integrated Service Digital Network / It's Some Dumb Network SIP vs BRI/PRI SIP does Best effort Delivery as same as IP traffic do, while BRI/PRI Provide QoS. If someone requires to attain QoS through SIP something like MPLS will do with a considerable amount cost. SIP is more flexible than BRI/PRI because it can be accommodated by company existing data network while BRI/PRI reuires to have a dedicated link for it self.