DevOps Classroomnotes 19/Oct/2022

Ntier architecture

• Overview
  
• BCDR (Business Continuity and Disaster Recovery):
  
• Elasticity: To support peak demands or variable demands, we need to scale out (increase) the servers and when the demand hits normal limits scale in (decrease).

General Configuration Details

• Public ip’s are required to serve connectivity from any where
• All of the servers will be deployed within a private network
• Necessary servers will have public ip
• Steps:
  • Create/use the private network. Ensure this private network can connect to internet
  • Some subnets should have an option to have public ip connectivity.
  • Create a database
  • Create the app server
  • create the web server
• Private ip has reserved ip ranges
  
• On the cloud we are supposed to choose the region(s) first. Generally low latency from actual usage locations.
• Cloud has Database as a service.

Ntier in Azure

• Create a resource group
  
  
  
• Create a virtual network in the resource group created
• Add 3 subnets
  • Data
  • Application
  • Web Subnet
    
    
    
    
• Create an Azure SQL Database (with connectivity to Data Subnet)
  
  
  
  
  
  
• Create a ubuntu vm in Application subnet
  • Install some softwares
    
    
• Create a ubuntu vm in Web Subnet
  • Install some softwares
    
    

Ntier in AWS

• In AWS we can create a vpc (Network) or use default vpc
• In this demonstartion we will be using a default vpc
  
• For database we will be creating a free tier eligible AWS RDS for mysql
  
  
  
  
  
  
  
  
• Ubuntu EC2 instance in one subnet (application)
  • No public ip
    
    
    
    
• Ubuntu EC2 instance in one subnet (web)
  • public ip