Sabin Shrestha

Mr. Sabin Shrestha is a technology visionary and computer sysadmin, security specialist, Web Application, Website, Mobile developer, who thrives on solving complex problems. Sabin is an industry-recognized expert with over 20 years of hands-on experience in Nepal and Europe . His career is highlighted on starting and creating new companies, organizations and products. He loves creating new entities and discovering creative ways of solving complex problems. Sabin's primary love is sysadmin, cyber security; but, he understands in order to be successful at securing an organization, you must have a detailed understanding of OS, Programming, WAN LAN Networks and related fields. He is passionate about customer service and his role as a network, sysadmin, developer, security expert and always exceeds his clients' expectations. He is also the Founder of I.T. Experts Solution, Check International, Global Link Technology in Nepal.

DRBD On CentOS

What is DRBD? DRBD is an abbreviation of Distributed Replicated Block Device. DRBD is a block device which is designed to build high-availability clusters. This is done by mirroring a whole block device via (a dedicated) network. You could see it as a network RAID1. Pre-Configuration Requirements: I used two nodes with the following system […]

Configuring A High Availability Cluster (Heartbeat) On CentOS

Configuring A High Availability Cluster (Heartbeat) On CentOS This guide shows how you can set up a two node, high-availability HTTP cluster with heartbeat on CentOS. Both nodes use the Apache web server to serve the same content. Pre-Configuration Requirements Assign hostname node01 to primary node with IP address 172.16.4.80 to eth0. Assign hostname node02 […]

Configure Postfix

Configure Postfix sample config Download Postfix config file [root@mail ~]#yum -y install postfix Loading “installonlyn” plugin Loading “fastestmirror” plugin Setting up Install Process Setting up repositories base 100% |=========================| 1.1 kB 00:00 updates 100% |=========================|951 B 00:00 addons 100% |=========================| 951 B 00:00 extras 100% |=========================| 1.1 kB 00:00 Loading mirror speeds from cached hostfile […]

Installing MRTG

Introduction You can monitor your system’s Web performance quite easily with graphical Linux tools. You’ll learn how to use several in this chapter, including MRTG, which is based on SNMP and monitors raw network traffic, and Webalizer, which tracks Web site hits. SNMP Most servers, routers and firewalls keep their operational statistics in object identifiers […]

Asterisk Installation

Basic Asterisk Installation Process1. Download ZaptelGet source wget http://t400p.pbxhardware.com/driver/zaptel-1.2.5.tar.gz Installating Zaptel cd /usr/local/src/ tar -zxvf zaptel.gz cd zaptel make clean make make install 2. Download Asterisk Get source wget http://ftp.digium.com/pub/asterisk/releases/asterisk-1.2.7.1.tar.gz Installing Asterisk tar -zxvf asterisk.gz cd asterisk make clean make make install make samples 3. Loading Zaptel Modules modprobe Zaptel modprobe tor2 modprobe wcfxo 4. […]