[AWS EC2] Amazon EC2 Basics

AWS Basic Features

• Can work anywhere in the world
• Not Requiring any hardware units
• Easily Sacalable (up and down)
• You only pay for what you need
• You have complete Control
• Highly Secure

AWS EC2? (Cloud Server)

AWS EC2 USE CASE?

SNS, EC2, and S3 help users to do cases. (Advertise or Nofity)

 

How to create AWS EC2 Instance? 

 

• Choosing a AMI (Amaon Machine Image)
  • AMI is a template that is used to create a new instance / machine based on user requirement.
  • AMI would contain: Software inforamtion, Operating System inforamtion, Volume information, Access permissions
  • AMI's are of 2 types:
    • Predefined AMIs
      • Created by Amazon and can be modified by the user
      • AMI Marketplace: thousands to use and pay.
    • Custom AMIs
      • Created by the user so that they can be reused.
• Choosing an instance type (Which hardware)
  • Hardware specifications that are required in the machine from the previous step.
  • Instance types are fixed and their configurations cannot be altered.
  • 5 Main Families
    • Compute Optimized
      • gives us lots of processing power
    • Memory Optimized
      • Application require in-memory cache
    • GPU Optimized
      • Graphical Requirement (Gaming)
    • Storage Optimized
      • Sorage Server
    • General Purpose
      • Equally balanced.
• Configuring instance (Configure Instance)
  • Specify
    • Number of instances
    • purchasing options
      • Multiple paying options (normal, reserved instance - pay for it upfront before months, spot instance)
        • pay less for using that instance
        • spot instance is lot cheaper than normal one. 
    • kind of network
    • the subnet
    • When to assign a public IP
    • the IAM role
      • IAM: Authentification
    • Shutdown behaviors (Very Different)
      • Stopping: Temporatily shutting down the system
      • Teminating: Returning control back to Amazon
    • Advanced details:
      • Users can add Bootstrap Scripts that are execcuted when the virtual machine starts up.
        • Bootstrap: scripts that you want to be run in the instance before it actually comes online.
        • ex: instead of I run it, I can create Bootstrap Shell Scripts and paste it in a console >> Amazon >> takes it and run it for the users. (automates it)
    • etc
• Adding Storage (Adding Storage to the EC2 Instance)
  • Bunch of Storage Options
    • Ephemeral Storage (Temporary and Free)
      • Free users aget to access up to 30 GBs of SSD or Magnetic storage (which can be found under 'Volume Type'
    • Amazon Elastic Block Storage (Permanent and Paid)
    • Amazon S3
  • The size (in GBs), volume type, the location where the disk in mounted, and whether the volume needs to be encrypted.
• Adding tags (Tags to easily identify)
  • For what purpose we create this
• Configuring security groups
  • Allow or deny connections for EC2 Instance
  • Actual Firewall that sits in front of EC2 instance.
    • protects it from unexpected inbound and outbound traffic that I can tune my EC2 instance based on port numbers anad based on IP address.
• Review
  • Configuration is what we wanted.. Checked.
  • Review the whole change. 
    • It will create a Key Pair
      • Public key that AWS stores and a private key file that I store.
        • Public Key is used by Amazon to identify the user.
        • Private key is downloaded by the user and kept by the user
          • Downloaded as .pem file.
• Access the EC2 Instance
  • It will require PuTTY and PuTTY generator to communicate with Linux Instance from Windows type.
    • PuTTY is a requirement for a Windows system to connect with a Linux system.
      • Does not accept .pem file.  PuTTY generator enables to read it
      • 1st: Ceate a new .ppk file (private key)
      • 2nd: Conversion > Insert Key  > load the .pem file
      • 3rd: Select Save Private Key and find a location to save the key. 
      • 4th: Open PuTTY configuration tool >> provide my IP address and click on Auth
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Use SNS (Simple Notification Service) to notify users? 

• Subsribers
  • List (We put)
  • Notification is sent to your subscribers every time you add something to your bucket, through email.