How to Add LDAP Users and Groups in OpenLDAP on Linux

by Karthikeyan Sadhasivam on February 24, 2015

To add something to the LDAP directory, you need to first create a LDIF file.

The ldif file should contain definitions for all attributes that are required for the entries that you want to create.

With this ldif file, you can use ldapadd command to import the entries into the directory as explained in this tutorial.

Using cloud computing, we can access various business and consumer applications as tools or utilities over the internet.

It allows us to create, modify and customize the business applications online.

Cloud computing can be broadly classified into the following two models:

Quick Apache Hadoop Admin Command Reference Examples

by Karthikeyan Sadhasivam on February 18, 2015

Hadoop LogoIf you are working on Hadoop, you’ll realize there are several shell commands available to manage your hadoop cluster.

This article provides a quick handy reference to all Hadoop administration commands.

JMeter LogoJMeter is a desktop application that can be used to perform functional testing and load testing.

While the JMeter application itself is designed as pure Java application, it can be used to perform load testing of any kind of web application, including those that are written in PHP, .NET, etc.

How to use Smart Pointers in C++ with Example Code

by Santosh Yadav on February 12, 2015

In C and C++ programming, pointers are very powerful.

As we explained in C pointers example article, pointers are variables that hold address of another variable so that we can do various operations on that variable.

Sometimes a programmer can’t imagine writing a code without using pointers, whether it is a simple binary search tree program, or a complex enterprise application.

But, pointers are hard to manage, master, and they can cause many problems if not handled properly.

For example, when not properly used, it can cause core dumps, dangling pointer, null pointer exception, memory leaks, etc.

HPSA stands for HP Server Automation.

HPSA is used to bring entire server infrastructure (both physical and virtual) under one management to gain full visibility to all your servers and operations.

It can handle multiple server management activities including provisioning on bare metal, software management, patch management, audit remediation, security management,etc.

This article explains major features within SA that can be used to automate your datacenter management.

How to Add Memory, vCPU, Hard Disk to Linux KVM Virtual Machine

by Karthikeyan Sadhasivam on February 10, 2015

In our previous article of Linux KVM series, we explained how to Install Linux KVM and create a Guest VM.

But, once you’ve created a Guest VM, you need to know how to perform some of the routine maintenance activities on the VM.

This tutorial will explain how to perform the following Linux KVM VM activities:

  1. Add Memory to VM
  2. Add vCPU to VM
  3. Add Disk to VM
  4. Save VM Configuration
  5. Delete a VM


7 Steps to Build a RPM Package from Source on CentOS / RedHat

by Karthikeyan Sadhasivam on February 4, 2015

Sometimes you might have access to an open source application source code but might not have the RPM file to install it on your system.

In that situation, you can either compile the source code and install the application from source code, or build a RPM file from source code yourself, and use the RPM file to install the application.

There might also be a situation where you want to build a custom RPM package for the application that you developed.

This tutorial explains how to build a RPM package from the source code.