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What is stickiness in AWS ELB?
With the new sticky session feature, it is possible to instruct the load balancer to route repeated requests to the same EC2 instance whenever possible. In this case, the instances can cache user data locally for better performance. A series of requests from the user will be routed to the same EC2 instance if possible.
What is meant by ELB?
Elastic Load Balancing (ELB) is a load-balancing service for Amazon Web Services (AWS) deployments. ELB automatically distributes incoming application traffic and scales resources to meet traffic demands. ELB helps an IT team adjust capacity according to incoming application and network traffic.
What is ELB used for?
The AWS ELB is a software-based load balancer which can be set up and configured in front of a collection of AWS Elastic Compute (EC2) instances. The load balancer serves as a single entry point for consumers of the EC2 instances and distributes incoming traffic across all machines available to receive requests.
Does AWS ELB support sticky sessions?
Sticky sessions are a mechanism to route requests from the same client to the same target. Elastic Load Balancers support sticky sessions.
How do I know if a sticky session is enabled?
Sticky sessions (also referred to as persistence and server affinity), is not going to be set directly in IIS on the individual servers in your farm, so there really isn’t a way to tell if persistence is enabled by looking at the IIS configuration.
What is ELB time?
When your web browser or your mobile device makes a TCP connection to an Elastic Load Balancer, the connection is used for the request and the response, and then remains open for a short amount of time for possible reuse. This time period is known as the idle timeout for the Load Balancer and is set to 60 seconds.
How to manage the duration of stickiness in Elb?
ELB supports two ways of managing the stickiness’ duration: either by specifying the duration explicitly, or by indicating that the stickiness expiration should follow the expiration of the application server’s own session cookie.
Why is sticky session important in Elastic Load balancing?
And that’s why they’re so important: If the load balancer supports sticky sessions then you don’t need to modify your application to remember client session context. The key to managing ELB sticky sessions is the duration of the stickiness: how long the client should consistently be routed to the same back-end instance.
What is the definition of sticky session persistence?
What is a sticky session Session stickiness, a.k.a., session persistence, is a process in which a load balancer creates an affinity between a client and a specific network server for the duration of a session, (i.e., the time a specific IP spends on a website).
When to enable application-based stickiness in load balancer?
When you enable application-based stickiness, the load balancer routes the first request to a target within the target group based on the chosen algorithm. The target is expected to set a custom application cookie that matches the cookie configured on the load balancer to enable stickiness.