T4puSD / spring-boot-redis-session

Moving Spring security user login sessions outside of application layer with redis.

Redis as HTTP session holder (Spring Boot)

This is a demo project to demonstrate the power of spring boot http session stored inside redis.

Benefit of using redis as a persistence session storage:

• The application layer will get some headroom as redis will be used to offload sessions
• Server restarts won't affect the session and user won't get logged out
• We can run multiple instance of the server and load balance user request without user getting logged out while routing to different instance

Dependency

• Java version 17
• You will need redis to be running in it's default host & port (change them to your liking from application.properties file if you want)

How to run and test the load balancing

1. Install nginx for your operation system
2. Take a back up of you existing ngingx.conf file if you have one
3. Replace the old ngingx.conf with the file present in the root directory of this project
4. Now run two separate instance of the application one in port 8080 and other in port 8081
   1. Open one command prompt and past this command to run in port 8080

      mvn spring-boot:run -Dspring-boot.run.arguments="--server.port=8080"

   2. Open another command prompt and paste this command to run in port 8081

      mvn spring-boot:run -Dspring-boot.run.arguments="--server.port=8081"

Now visit http://localhost

You will need to login. There are two in memory user:

1. UserName: user Password: password Authorized Endpoints: /
2. UserName: admin Password: password Authorized Endpoints: / & /admin

If you hit and keep refresh page on / endpoint. Now and go back and forth between the two opened terminal prompt now
you will find out that user hit will be printed on different terminal prompt each time which will cycle through the two prompt.

Which proves the application is getting load balanced without logging out the user