AWS Lambda Serverless

• AWS Charges for Lambda only for the time that our code is executing, down to a 100 ms precision.
• Lets understand ec2 instance billing
  • this instane is charged for every hour (minimum unit)
  • The cost of the ec2 changes
    • per region
    • image used to create ec2 instance
  • There is an addition cost for disk storage (EBS)
  • Lets create an estimate of ec2 instance for one month
  • Now what if the application i.e. running on this server is used only for 30 hours
• Now lets create a billing estimate for the aws lambda for 30 hours in a month
• Free tier of AWS Lambda

Create a hello-world lambda function

• Navigate to aws console and select AWS Lambda

Understanding software architectures

• The evolution of compute has opened new possibilities regarding how we structure and architect our applications
• Major Software Architectures used in the enterprise are as follows
  • Monolith
  • N-Tier
  • Microservices
  • Nano Services
• Monolith:
  • In earlier days we used to create software that was single-tiered. The frontend and backend code was combinted and often database was also running on the same machine.
  • When the demand has high, it was necessary to scale the entire application and not just the parts that were being used the most.
• N-tier – achieve individual scale
  • With the introduction of vm’s also came SDN, this gave us flexibility in how we can build, configure and scale our applications in a network
  • This has given an option to run different tiers on different workloads.