AWS Tutorial Application Load Balancer | Sticky Sessions #aws #cloud #cloudcomputing #alb #clb

In this video you will learn what Sticky Sessions are and how it works and how to configure the AWS load balancer Sticky session.

By default, an Application Load Balancer routes each request independently to a registered target based on the chosen load-balancing algorithm. However, you can use the sticky session feature (also known as session affinity) to enable the load balancer to bind a user's session to a specific target. This ensures that all requests from the user during the session are sent to the same target. This feature is useful for servers that maintain state information in order to provide a continuous experience to clients. To use sticky sessions, the client must support cookies.

Application Load Balancers support both duration-based cookies and application-based cookies. Sticky sessions are enabled at the target group level. You can use a combination of duration-based stickiness, application-based stickiness, and no stickiness across your target groups.

The key to managing sticky sessions is determining how long your load balancer should consistently route the user's request to the same target. If your application has its own session cookie, then you can use application-based stickiness and the load balancer session cookie follows the duration specified by the application's session cookie. If your application does not have its own session cookie, then you can use duration-based stickiness to generate a load balancer session cookie with a duration that you specify.

The content of load balancer generated cookies are encrypted using a rotating key. You cannot decrypt or modify load balancer generated cookies.

For both stickiness types, the Application Load Balancer resets the expiry of the cookies it generates after every request. If a cookie expires, the session is no longer sticky and the client should remove the cookie from its cookie store.

#aws #cloud #cloudcomputing #alb #clb

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