What Is Bootstrapping? – When You Launch An Instance Using AMI, You Might Have Noticed That The Launched Instance Is Fresh And There Is No Configuration On That Instance.

• So Basically It Comes With The Default Configuration And It Is Not Your Projected Instance.
• But You Have To Install Certain Package And Want To Do Some Configuration.
• Means You Want To Do Some Configuration On The Top Of This EC2 Instance And You Want To Make That That Instance Your Projected.
• This May Take Some Valuable Time And Efforts.
• And In Order To Automate This Installation And Configuration
• We Can Pass Some Codes At The Time of Launch Of The Instance To Initiate This Task.
• So This Process Is Known As Bootstrapping.
• Let’s Say You Are Launching An Instance.
• Whether It May A Linux Instance Or Windows Instance, So We launch It This Instance Is Fresh And New.
• Nothing Is Installed On The Top Of This.
• Once The Installation Is Done.
• What We Normally Do, You Take Its Remote, You First Of Install Some Packages, Enable Some Services, You Copy Some Data.
• Then You Feel That Some Instance Is Ready To Use.
• So Basically This Is A Time Taking Procedure.
• And You Do Not Want To Waste Your Time.
• If You Seeking A Kind Of A Method.
• Which You Complete All These Tasks.
• Assigned Tasks, In The Installation Time.
• So That Can Be Done.
• That Can Be Done With The Help Of The Bootstrapping.
• Bootstrapping Enables You To Script Software Installation Configuration.
• At The Time Of Launch Of Your Instance.
• Let’s Say If You Have An Script, let’s Say You Are Taking An Script In Case Of Linux
• That Script Tell You How You Can Install These Required Softwares Configuration.
• So If You Pass That Script During The Launch Of The Instance.
• The Entire The List Of Tasks You Are Completed.
• So You Not To Take Remote Your Machine To Configure Furthur.
• This Is Called Bootstrapping.
• I’ll Tell You How The Things Can Be Done.
• Let’s Say We Have One Script Who Configure Your Server.
• I’m Taking A Simple Script In Note Pad
• I’m Just Writing A Simple Script
• Youll Understand
• What You Normally Do To Configure Your Server As An Apache Server.
• Lets Say, First Of All

Open Your Note Pad And Write

#!/bin/bash

sudo yum install -y httpd       //THIS COMMAND WILL INSTALL HTPPD PACKAGE  IN YOUR LINUX MACHINE//

sudo service httpd start      // ONCE THE PACKAGE IS INSTALLED YOU’LL SWITCH ON THE SERVICE //

checkconfig htppd on

echo “This is my bootstrapped VM of linux” > /var/www/html/index.html

• These Lines About Configuration We Already Done Multiple Times.
• These Are The Lines You Need To Pass Through Install One Httpd Server
• Once It Is Installed What Youll Do
• Youll Just Write Line echo “This is my bootstrapped VM of linux” >
• You Just Pass This Line To index.html
• Which Implies In /var/www/html/index.html
• These Are The Four Lines You Need To Write
• To Configure Your Linux Instance As Your Apache Server
• This Is Very Simple Configuration I Need To Pass
• This Is A Kind Of Script You Need To Pass
• Either You Need To Store These Lines In A Particular File
• So That You Can Share The File
• During The Launch Of The Instance
• If This Script Is Really Small,
• You Can Copy & Paste The Script
• And That Can Be Done
• Means Your Machine Will Be Configured
• But Please Ensure That There Should Not Be Any Mistake
• In This Script
• There Should Not Be Any Mistake
• Do You See Any Mistake Here

Just Go To EC2 Dashboard On AWS Site

• Click On Instances
• Click On Launch Instance
• Select Linux AMI Free Tier
• Select t2.micro In Instance Type
• It Free of Cost That’s Why I’m Selecting It
• Click On Configure Instance Details
• now The 3rd Step, This Is Important
• To Place Your Machine In A Particular VPC
• Particular Availability Zone Or Subnet
•  Select All These Settings On This 3rd Step On The Page As It Is
• Don’t Make Any Changes
• But Where You Can Pass That Script
• Scroll Down On This Step 3
• If You Scroll Down, There Is Advanced Details Option
• You Just Click And Open This Advanced Option
• And Here(User data) Either You Can Pass The File
• If You File As a Script, You Just Click On ‘As File’ Option
• And Choose A File
• Might Be Your File Is Stored In Your Laptop Or Desktop
• You Can Upload The File
• Or If The Script Is Really Small
• You Can Paste The Script Here(User Data)
• Then Click On Add Storage
• Select 8gb
• Click On Configure Security Group
• You Need To Configure The Security Group In Order To See The Result
• Click On Add Rule
• Select HTTP
• Because In HTTP Port Number 80 Should Be Open
• You Just Open This Port No 80
• Click On Review & Launch
• Select Key Pair, Check Box
• Finally, Click On Launch
• You Launched The Instance
• I Hope Everything Is Fine
• In Few Seconds The Machine Will Be Ready
• Once The Machine Is Ready
• Youll Take Its Remote
• Youll Check Directly On Your Browser
• To Check Whether This Machine Is Configured Or Not
• If Your Machine Is Configured, Your Script Is Working Fine.
• The Machine Will Be Ready
• Copy The IP Address Of The Machine You Created Now
• And Just Open Browser
• Paste The IP Address And See Its Working Or Not
• It Should Work
• You’ll See “This is bootstrapped VM of Linux” on The Page
• It’s Working

You Have To Be Very Good In Scripting If You Are Writing A Script.

Do Some Assignments

1. Create A VM(LINUX) With a Private Key – how will you regain access over the instance again
2. Create A Window 2012/2016 Instance & Configure It As Web Server & Test It.
3. Create VM and Add 10gb ebs Volume To It.
4. Launch Linux Instance & Pass A Bootstrap Script To Configure Machine As A Apache Server
5. Search/Find Apache Server Script From Was Documentation And Implement It.

You Can Check AWS Bootstrap Scripts For Linux On Google