How to Secure SSH Connections with Port Knocking on Linux CentOS

Port Knocking is a technique used to secure connections or port access from unwanted users. Using this technique we maintain one or more previously configured ports closed and these will only be opened using a sequence of requests to a number of ports that wepreviouslyset . To give an example , if we configure port …

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How to Setup MariaDB Galera Cluster 5.5 in CentOS, RHEL & Fedora

MariaDB is an relational database management system (RDBMS). Generally we use single node of database server for small application but think about application which have thousands of users keep online at a time, In that situation we need a structure which will capable to handle this load and provides high availability. So we need to …

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Install Lighttpd Web Server on CentOS/RHEL 6/5 using Yum

Lighttpd is high performance web server created suitable for running on production environment. It is highly optimize, secure and very flexible web server. Lighttpd utilize very low Memory and CPU than other web servers. Its event-driven architecture is optimized for a large number of parallel connections (keep-alive) Lighttpd powers several popular Web 2.0 sites. It …

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How to Install Java 7 (JDK 7u55) on CentOS/RHEL 6/5 & Fedora

Many times i faced issues with installing java using rpm or other source. After that i found a better way to install java from Sun site. Using below steps i have installed java successfully many times without facing any issues. We can also install multiple version of java easily if required. Oracle has also released …

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Install Java 8 (JDK 8u5) on CentOS/RHEL 6/5 and Fedora

After a long wait, finally Java SE Development Kit 8 is available to download. JDK 8 has been released on Mar,18 2014 for general availability with the many featured enhancements. You can find all the enhancements in JDK 8 here. This article will help you to Install JAVA 8 (JDK 8u5) or update on your …

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How to Install MongoDB 2.6 on Ubuntu and Dabian Systems

MongoDB (named from “huMONGOus“) is a full flexible index support and rich queries database. Its is a NoSQL database. MongoDB provides large media storage with GridFS. Click here for more details about mongoDB. This tutorial will help you to install MongoDB 2.6 Production release in Ubuntu Systems. Step 1: Add APT Repository First import public …

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Steps to Install MongoDB 2.6 on CentOS/RHEL & Fedora

MongoDB (named from “huMONGOus“) is a full flexible index support and rich queries database. Its is a NoSQL database. MongoDB provides large media storage with GridFS. Click here for more details about mongoDB. MongoDB has released new stable version 2.6 with lots of major enhancements. This tutorial will help you to install MongoDB 2.6 on …

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How to Replace Faulty Device from RAID Array

In the previous article we describe to how to Setup RAID-1 in RHEL/CentOS systems. Some times disks attached with the array get failed working, RAID simply mark it as faulty device and do not use it any more. In that situation we need to replace the faulty device with new working device. The below image …

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How to Setup RAID-1 Array using Two Virtual Disks in CentOS/RHEL 6

RAID stands for Redundant Array of Inexpensive (Independent) Disks. RAID-1 is also known as striping. RAID-1 required minimum two disks. The max data on RAID-1 can be stored to size of smallest disk in RAID array. In this article we are using CentOS 6.5 running with VMWare. I have added two virtual disks as /dev/sdb …

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