Cloud-Computing

Objective

Deploying a web application on AWS-EC2

Tools and Technologies

Category	AWS Services & Technologies
Web Application	Java, MySQL, Hibernate ORM,Shell Scripts, AWS-SDK
Infrastructure	VPC, ELB, RDS, Lambda, DynamoDB, Route53, Terraform
Metrics & Logging Service	statsD, AWS Cloud-Watch, Log4js, Cloud-Watch Alarm
Lambda & Notification Mechanism	Lambda,SNS, SES
CI/CD Pipeline	Circle CI, AWS Code Deploy, Packer
Security	SSL/TLS , RDS Encryption

Architecture Design

Infrastructure - Terraform

• created custom VPC with network setup using Terraform Script
• Attached Load balancers, auto scaling groups, SES and SNS services
• Created necessary service roles and policies for AWS resources
• Implemented Lambda function for emailing service

AMI - Hashicorp Packer ( CI/CD Pipeline )

• Automated AMI creation using Hashicorp packer
• Created AMI template to share the image between multiple AWS accounts
• Created golden images by adding provisioners to boostrap instances with - JDK, Code deploy and Cloud watch agent

AWS Code Deployment (CI/CD Pipeline )

• Integrated Github repository with Circle-CI for continuous Integration
• Bootstrapped circle CI container with docker image to run the test cases and generate new code artifact
• Artifact is copied to S3 bucket and code deployement is triggered on running instances of autoscaling group
• In-Place deployment configuration hooks are placed for routing the traffic during deployment

Logging & Alerting - Cloud Watch Services

• Embedded statD to collect various metrics such as counter for APIs hits and API response time etc
• Logged the info, errors and warnings using log4js and further mounted them in AWS cloud-watch for analysis
• Implemented CPU Utilization based alarms for changing number of instances in auto scaling group

Faas (Serverless Computing) - Lambda

• Implemented pub/sub mechanism with SNS and Lambda function
• when user requesting for password reset, message is published on SNS Topic
• Once message is published to SNS Topic, subscribed lambda function is trigged
• Lambda delivers password reset link email to requesting user and saves the entry in Dynamo DB with TTL of 15 minutes

Webapp -Online Book Store

API Impementation with Spring Boot and Hibernate ORM Programming language : Java

External Libraries used:

1. UUID - for generating tokens
2. Bcrypt - for hashing out the passwords
3. basic-auth - Authentication module
4. Hibernate - ORM for Java
5. mysql - dialect for hibernate
6. mockito - for integration testing in java

Build & Deployment

• The application runs on AWS Cloud EC2 instance and is deployed via CircleCI pipe-line
• As soon as there is a merge take place to the webapp repository, the build gets triggered and deployment takes place in AWS account

Load Testing

• Load testing is done by JMeter, download JMeter from offical website and run the jmx script
• Script is available in webapp folder