Sticky Sessions ( Session Affinity)

Question 1

What is sticky sessions (session affinity)?

Answer 1

It is possible to implement stickiness so that the same client is always redirected to the same instance behind a load balancer

Example use case: make sure the user doesn’t lose his session data

Question 2

Which types of load balancers support sticky sessions?

Answer 2

Classic Load Balancer, Application Load Balancer, and Network Load Balancer

Enabling stickiness may bring imbalance to the load over the backend EC2 instances

Question 3

What is the purpose of the ‘cookie’ used for stickiness?

Answer 3

The ‘cookie’ used for stickiness has an expiration date you control