Category Archives: Uncategorized

Installing ELK

TweetVersion of Elastic search used: elasticsearch-2.3.3 Version of logstash used:  logstash-2.3.3 Version of kibana used:  kibana-4.5.1 OS used: ubuntu 15.04 The only pre-requisite is java runtime. Issue : java -version java version “1.7.0_95” OpenJDK Runtime Environment (IcedTea 2.6.4) (7u95-2.6.4-0ubuntu0.15.04.1) OpenJDK 64-Bit Server VM (build 24.95-b01, mixed mode) If java is not installed at your end,… Read More »

Bad substitution Error in Linux

TweetI was trying to run a script from a shell, it executed properly. But when I was running this script in cron, the script does not behave correctly. It runs partially. Then I tried following in cron: 10 10 * * * /data/ >>/tmp/script1.log 2>&1 After the cron finished executing, I looked up in /tmp/script1.log.… Read More »

Pulp Installation on CentOS

TweetPulp is a open source Package Management software. Pulp need A database system – I used mongodb A messaging system – I used qpid So before going further with pulp server installation, I installed mongodb and qpid. On my centos 6.5 system , I configured  pulp-2-stable repo #vi /etc/yum.repos.d/pulp-2-stable.repo  [pulp-2-stable] name=Pulp 2 Production Releases baseurl=… Read More »

Hadoop Installation

TweetHadoop 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-   We have openjdk , but not openjdk-devel.  We will require open-jdk also because it provides a tool jps which… Read More »

PCI DSS Compliance

TweetPCI-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… Read More »

What is Docker?

TweetAs 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:… Read More »

SSH: Client-Side Server authentication

Tweet        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… Read More »

ReSize Disk Partition in Linux

TweetResizing disk is a very hot topic of discussion among the system administrators. A few admins agree and many disagree with the idea of resizing disk partitions. I am sharing my piece of knowledge on this. I have been in a situation where /tmp partition of disk has to be resized. My disk was of… Read More »


Tweet> Redhat Enterprise Linux 6.x provide you option to use XFS file system in place of Ext4. XFS is robust and highly-scalable 64 bit journaling file system. This file system is entirely extent based and support large file and file system size. XFS overcomes one of the nightmare of EXT filesystem, that nightmare is crash… Read More »