Hadoop Installation

Hadoop version used: 2.2 downloaded from apache website. Platform: RHEL 6.4 64bit Hostname : host1.test.local Prerequisites: Installing java Adding dedicated Hadoop system user. Configuring SSH access. Installing java [root@host1 ~]# rpm -qa|grep java tzdata-java-2012j-1.el6.noarch java-1.7.0-openjdk-1.7.0.9-2.3.4.1.el6_3.x86_64   We have openjdk , but not openjdk-devel.  We will require open-jdk also because it provides a tool jps which […]

PCI DSS Compliance

PCI-DSS is a compliance standard for Payment Card Industry. PCI-DSS stands for Payment Card Industry Data Security Standard. As we know Banks and Debit/Credit Card issuing authority facing new security challenges everyday. Payment brands such as Master Card, VISA, DISCOVER etc formed a International authority known as PCI-SSC(Payment Card Industry Security Standards Council) to develop […]

What is Docker?

As per docker website, Docker is “an open source project to pack, ship and run any application as a lightweight container.” Here container refers consistent and standard packing of applications. The idea of providing as a container is to enable it to run on any infrastructure. The technologies used in Docker are as below LXC: […]

SSH: Client-Side Server authentication

        We know that in SSH, server authenticate client before allowing to logon on server. Server authentication process identifies user through local, LDAP or Kerberos authentication process. SSH also provides mechanism to authenticate server on client side before client proceed to logon on server. In order to authenticate server in initial key exchange, the client keeps […]

Linux Cryptography

In Redhat Linux such as CentOS and RHEL, OpenSSL package provides three categories of functions   libcrypto:  This category include generic encryption related functions. The generic functions provided by libcrypto are used by other programms such as Bind,SASL, OpenSSH etc.  libssl: This category provides open source implementation of TLS and SSL. As we know there are […]

NMAP Port States

From Operating System point of view, port can have only two states either Open or Close.  Irrespective of port state from OS views, NMAP detects six type of port states and these states are listed as below Open =>This state is same as Operating System open state. If any port is Open then it will accept […]

Solaris Service states

This is my first post on Solaris. I am sharing my knowledge on service management part of Solaris. Command given in this article is tested on Solaris 10 and Solaris 11. Solaris services are managed through SMF (Service Management Facility). SMF is completely different from init.d style services. There are a few commands such as […]

Heartbleed & KRL

On 7th April, Heartbleed(CVE-2014-0160) shook both the tech-savvy world and the end-users alike. Majority of us use OpenSSL for one or the other reason. If it’s any version of OpenSSL from 1.0.1 through 1.0.1f, released between December 2011 & April 2014, then consider that you have already got compromised with security keys, private keys, passwords […]

OpenStack Storage Types

There are multiple enterprise class storage solutions available such as storage solution from EMC, IBM etc.  Other than enterprise class storage solutions there are variety of storage need exist with varying performance and price range. In Cloud storage environment, Object  Storage and Block Storage two storage category making trends now a days. Object Storage Vs […]