EC2 Service Aws

 Class 9th S3 Ec2 service   Apr22nd

EC2 Elastic Compute cloud: Simple called it has 2 C, EC2 

What is Ec2?

• AWS EC2 is a core service within Amazon Web service (AWS) that provides resizable  compute capacity in the cloud.
• It run from the Ec2 host servers(also called physical servers) residing in the AWS datacenter 
• These hosts servers are large hardware units that are divide into smaller chunks ,each chunk functions as a virtual server(instance)
• We can use these host server as shared server or dedicated servers 
• Users can launch these servers with required OS setup in Pay-as-You-Go model 

Key feature of Ec2
 1.Scalabilty (We can change the Ec2 server whenever required)

 2.Flexibility(We can able upgrade downgrade whenever required)

 3.Customizable (Load balance we can install whatever required) 

 4.Pay-as-you-go pricing (How much you can use pay that much only)

 5.Global reach (We access any where Globally )

 6.Integration with other Aws services (Given permission we will communicate other aws services)

Ec2 Architecture

 Ec2 is region specific ,each region has there availability zone (data center)

 Instance has (Ip address,security group,key value pair)

 Ec2 Free limit per month 750 hrs(12 free)

On-Demand instances :Whenevery you required it will give you new ip

Dedicate Instances: reserved instance for dedicated ip

Amazon Linux:AWS build the own Linux using Linux kernel,All Linux system in AWS Command Window access no GUI Access

Amazon Machine Image(AMI):

• Used to create/launch the Ec2 instances.
• AMI are available with various o/s for different requirements 
• AMI's regional,each AMI Contains a unique ID Which is different form region to region 
• Users can design own AMI and sell in the AWS market place.
• AMIs are immutable :once you create an AMI,it remains unchanged, Any changes made to the instance after the AMI Creation won't affect the image.

Amazon Machine Image: AWS Provided, Community, Market place 

VM Creation Steps:

Step1: Choose Amazon Linux ,Generate Keypair you see below RSA, ED25519 more Strong Secure compared to RSA ,RSA will support window/Linux both ED22519 

will support Linux only,Give key pair name "VM-LINUX_FIRST"

.pem file it has private key ,while creating instance it has public key ,both the combination match and it will you authenication password and generate and give you

.ppk is putty based to connect ,third party service you can use

Step2:In the network section need vpc which we created,Auto -assigned public always be enable to connect public ,else Elastic Ip is chargeable

 Linux storage by  default 8 gb ,for Windows 30 gb 

Advance option User data, Placement group not covered 

just click launch instance 

Step3:Connect AWS ,you can use SSH key which you have download VM-LINUX_FIRST.Pem key place directory and connect in local cmd prompt 

Ec2-user is default user limited permission 

root - has supermium permission admin for ec2 instance 

                                                    Simple Website Creation 

Two types of website 1.Static Website (Unchangable), 2.Dynamic Website (dynamical change and store info in Database  level Change in periodically automictically) Now we are static website hosting using Linux instance.

Step1: After launch the instance amazon Linux  for host website need install some software in Linux ,Apache and https package using sudo user

[ec2-user@ip-10-0-0-31 ~]$  sudo yum install httpd

Installed:

  apr-1.7.5-1.amzn2023.0.4.x86_64                                apr-util-1.6.3-1.amzn2023.0.1.x86_64

  apr-util-openssl-1.6.3-1.amzn2023.0.1.x86_64                   generic-logos-httpd-18.0.0-12.amzn2023.0.3.noarch

  httpd-2.4.62-1.amzn2023.x86_64                                 httpd-core-2.4.62-1.amzn2023.x86_64

  httpd-filesystem-2.4.62-1.amzn2023.noarch                      httpd-tools-2.4.62-1.amzn2023.x86_64

  libbrotli-1.0.9-4.amzn2023.0.2.x86_64                          mailcap-2.1.49-3.amzn2023.0.3.noarch

  mod_http2-2.0.27-1.amzn2023.0.3.x86_64                         mod_lua-2.4.62-1.amzn2023.x86_64

Complete!

Step2:After install ,We can the httpd status using command  sudo systemctl status httpd

Step3: using command for start sudo systemctl start httpd checking the status again active and running 

Step4: After installation Apache path default path is  /var/www/html 

If you want launch simple website,the default page is index.html 

After installation httpd, just check public ip is working or not ,it connect direct direct default page (index.html)

See below Default page open successfully

Step5:

[ec2-user@ip-10-0-0-31 html]$ sudo vi index.html

[ec2-user@ip-10-0-0-31 html]$ cat index.html

<h1> Welcome to Blog </h1>

Step6:

Step7: Once you stop instance ,automatically public ip will change and apache httpd will inactive 

you make manually start, Instead of manually start every time  after instance restart 

use below command enabled it will automatically start .

[ec2-user@ip-10-0-0-31 html]$ sudo systemctl enable httpd

Created symlink /etc/systemd/system/multi-user.target.wants/httpd.service → /usr/lib/systemd/system/httpd.service.

                                Instance Image Copy and Launch instance with image

    if you want copy the same Instance image Below Steps

Step1: Select insance >Image and templated and create image

Step2: Just give image name VM-Image Click Create Image ,it will take some time to complete

Step3:Amazon machine image take some time 

Image now available(next time while you want create new instance ,take above image launch the instance the image Apache default), This is help you not required to install same softwares again

Step4:Launch new instance this time using our image 

Note: we can able change Linux version here, you can able to Change network setting and Security key pair and then Click launch the instance 

Step5:See below successfully created new second instance using image it the instance automatically 

has default software apache, just check once default page opened or not using public ip url

Step6:          

Step7: while connect using sshkey copy here see root default need change ec2-user and connect

ssh -i "VM-LINIX-SECOND.pem" root@34.240.205.112

PS C:\Users\Administrator> ssh -i "VM-LINIX-SECOND.pem" root@34.240.205.112

The authenticity of host '34.240.205.112 (34.240.205.112)' can't be established.

ED25519 key fingerprint is SHA256:c6LhEFgi2mMaPT1L3kE2/9dL+a12diUWugaxgzJHcNs.

This key is not known by any other names.

Are you sure you want to continue connecting (yes/no/[fingerprint])? yes

Warning: Permanently added '34.240.205.112' (ED25519) to the list of known hosts.

Please login as the user "ec2-user" rather than the user "root".

Connection to 34.240.205.112 closed.

PS C:\Users\Administrator> ssh -i "VM-LINIX-SECOND.pem" ec2-user@34.240.205.112

Last login: Sat Apr 26 09:50:32 2025 from 5.204.1.73

[ec2-user@ip-10-0-0-101 ~]$

Immutability means after image take any change one instance that change not carry to new instance that is called immutable 

                                    Instance Launch with Condition User data option

                                     install Apache using commands

Step1:Create Instance give name VM-LINIX-THIRD, additonal setting going to User data setting 

After give below lines in the User data section and click launch Instance

#!/bin/bash -xe

# STEP1 -Updates

yum -y update

# STEP2 -Begin Configuration

yum -y install httpd

systemctl enable httpd

systemctl start httpd

# STEP3 -Customer Web Page

echo "<h1> Welcome to Blog VM Third Instance</h1>" >> /var/www/html/index.html

Step2: See here automatically Apache installed and index setup done 

Step3:After completed work need Deregister AMI image which we have created

Click AMIs, due cost related clear that

Thanks