Category: How To

Learn | Teach Open Source Technologies

What is GRSecurity

Grsecurity® is an extensive security enhancement to the Linux kernel that defends against a wide range of security threats through intelligent access control, memory corruption-based exploit prevention, and a host of other system hardening that generally require no configuration. It has been actively developed and maintained for the past 15 years. Commercial support for grsecurity…
Read more

How to enable and use EPEL Repo in RedHat / CentOS Linux

Red Hat Enterprise Linux 7 / CentOS 7 rpm -ivh yum update

Setting up custom domain in OSClass

Please go to your server root and open config.php to setup custom domain cd /var/www/html/

How to Install and configure Apache Storm

STORM INSTALLATION SETUP Before setting up Apache Storm, Zookeeper server must be setup in the cluster, which takes the main responsibility of running Storm cluster. Zookeeper is not used for message passing, so the load Storm places on Zookeeper is quite low. Single node Zookeeper clusters should be sufficient for most cases, but if you…
Read more


VPN INSTALLATION on Linux [root@app-01 ~]# uname -a Linux app-01 2.6.32-431.11.2.el6.x86_64 #1 SMP Tue Mar 25 19:59:55 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux [root@app-01 /]# mkdir download [root@app-01 /]# cd download/ [root@app-01 download]# ll total 0 [root@app-01 download]# mkdir vpn [root@app-01 download]# cd vpn/ [root@app-01 vpn]# ll total 0

Openfiler 2.99.1 Single node Installation by Ahmad Adnan

Openfiler 2.99.1 Single node Installation with RAID iSCSI and Physical Volume Step by Step with Screenshots Compiled by: Ahmad Adnan Dated: June 14, 2014 OS:         Openfiler ESA, version 2.99.1 RAM:     512 HDD:      8GB

3 Nodes DRBD 8.3 Highly Available Cluster on CentOS / Fedora / RHEL Setup by Ahmad Adnan

3 Nodes DRBD 8.3 Setup by Ahmad Adnan Three-way replication via DRBD stacking. Complied by: Ahmad Adnan

Installation of Oracle Java 1.6.0_45 on CentOS /RHEL 6.x

Download jdk-6u45-linux-x64-rpm.bin [root@terracotta-02 downlaod]# ./jdk-6u45-linux-x64-rpm.bin

Highly Available Linux Cluster for (LAMP) Apache, MySQL, PHP using DRBD and HeartBeat on CentOS / RedHat / Fedora

          Disclaimer: The following steps are performed on Virtual machines and tested successfully. It is advised to test first on raw / virtual machines and then in production environment. We will setup for Apache Webserver and MySQL on High Availability Cluster (2 Nodes). Test Scenario: