Python Boto: How to install and configure in Linux/Unix?

By this time you may realize who important is cloud computing. To become cloud expert as a system administrator we should know some programming to automate cloud instances creation. When we say cloud the first thing comes to our mind is Amazon AWS cloud.

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Linux/Unix: How to update timezone in a system

How to update time zone in Linux? Some times it is required to update our timezone when we move our machines(VMs) from one location to other. Recently I came across a situation where I want to move my machine time zone from

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Linux/Unix: Sync system date/time with NTP server

How to sync system time with NTP server? This is small howto on how to setup ntp sync on a Linux box. Before going to do this we should know why we require to sync with NTP server. NTP is a network

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Puppet: Open 8140 port on Master in firewall

When we are working on critical services like puppet master we have to secure master in many ways. In that one is enabling firewall to close all the ports expect 8140 port where master listens node requests. In this post we will

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Puppet: Auto sign certifications from nodes

As Puppet works in Client-Server model and to happen this, Puppet master uses secure channel to communicate with its nodes. In order to use this secure channel puppet nodes need to register them to a puppet master and at puppet master we have

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GIT: How to set or change Username and E-mail?

hen we are using GIT, its advaisable to set username and e-mail so that we no need to set them everytime we use GIT to do changes. This post will show you on how to set username and e-mail for editing data

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Uninstall docker in Apple mac book in three steps

If your docker is not working fine and you want to reinstall it then this post is for you. This will show how to remove docker completly either manually or through a basic shell script. Step1: Stop boot2docker service if it is

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How to install Docker in Mac OS

Docker is a container virtulization which has caught the world with a bang. This is one the best project on github with over 15000 stars. In this post we will see on how to install docker in Macbook pro. Download latest Docker

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Shell scripting: Convert a string from lowercase to uppercase

The linux shell has provided us with many hidden gems. Some of things are string manipulation with out using external commands like SED/AWK. In this post we will see how to convert a string from lower case to upper and upper case

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AWK substr function explained with examples

We already writtn one excellent string manipulation post for shell. This post is in response to the code which I seen in my office for greping IP address from ifconfig command. The command is.. ifconfig eth0 | grep 'inet addr' | cut -d: -f 2

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