Flight Booking AWS Application

This repoistory shows how to deploy a Spring Boot application on AWS. The application is an imaginary Flight Booking application and only supports the back-end API.

Requirements

The application has been tested locally with the following:

• Java 17
• Maven 3.8.4
• MySQL 5.7.x

Local testing

To test the application locally, you need to update application.properties similar to this:

# Only for testing purposes - comment this in production
# spring.jpa.hibernate.ddl-auto=create
spring.datasource.url=jdbc:mysql://localhost:3306/bookflight
spring.datasource.driverClassName=com.mysql.cj.jdbc.Driver
spring.datasource.username=<a-privileged-user-name>
spring.datasource.password=<a-privileged-user-password>

# Hibernate SQL dialec
spring.jpa.database-platform=org.hibernate.dialect.MySQL5Dialect

Then you can use your IDE or maven to run the application using:

mvnw spring-boot:run

The flights added with bootstrapping can be seen at http://localhost:8080/api/v1/flights

The following endpoints can be tested with curl or Postman:

[POST] api/v1/flights

[PUT] api/v1/flights/reserve/{flight-id}

[PUT] api/v1/flights/release/{flight-id}

[POST] api/v1/bookings

[PUT] api/v1/confirm/{bookingId}

[PUT] api/v1/cancel/{bookingId}

Prepare AWS Environment

The application is deployed on AWS using the following services:

• AWS Elastic Beanstalk
• AWS RDS

Here are the the steps to prepare the environment:

Set up an Elastic Beanstalk application environment:

aws elasticbeanstalk create-application --application-name flightbooking

Create an application version

aws elasticbeanstalk create-application-version --application-name flightbooking --version-label v1

Make sure your application version exists

aws elasticbeanstalk describe-application-versions --application-name flightbooking --version-label v1

Create a configuration template for the application

aws elasticbeanstalk create-configuration-template --application-name flightbooking --template-name v1 \
  --solution-stack-name "64bit Amazon Linux 2 v3.4.2 running Corretto 17"

Create environment

aws elasticbeanstalk create-environment --cname-prefix flightbooking-cname \
  --application-name flightbooking --template-name v1 --version-label v1 \
  --environment-name v1clone --option-settings file://options.txt

Determine if the new environment is Green and Ready

aws elasticbeanstalk describe-environments --environment-names v1clone

Create an S3 bucket for storing application versions

aws s3 mb s3://flightbooking-files

Create an RDS database:

aws rds create-db-instance \
  --db-name bookflight \
  --db-instance-identifier flightbooking \
  --db-instance-class db.t2.micro \
  --allocated-storage 200 \
  --engine mysql\
  --master-username root \
  --master-user-password a_strong_password

Update Elastic Beanstalk environment variables with database connection settings:

aws elasticbeanstalk update-environment --environment-name v1clone \
  --option-settings Namespace=aws:elasticbeanstalk:application:environment,OptionName=MYSQL_HOST,Value=flightbooking.coyo72ntjmdh.us-west-1.rds.amazonaws.com

Deploy on AWS

Create WAR or JAR file of the project

    mvn clean package spring-boot:repackage

Upload the JAR file to the s3 bucket:

    aws s3 cp target/flightbooking-0.0.1-SNAPSHOT.jar s3://flightbooking-files/flightbooking-0.0.1-SNAPSHOT.jar

Create a new version of the application version and update the environment:

    aws elasticbeanstalk create-application-version --application-name flightbooking --version-label "0.0.1" --source-bundle S3Bucket="flightbooking-files",S3Key="flightbooking-0.0.1-SNAPSHOT.war"
    aws elasticbeanstalk update-environment --environment-name v1clone --version-label "0.0.1"

Future Improvements

• Add authentication/authorization to backend
• Add CI/CD
• Use AWS Lambda to make some API serverless