How can the developer ensure that no sessions are lost if an Amazon EC2 instance fails?
Use sticky sessions with an Elastic Load Balancer target group.
Use Amazon SQS to save session data.
Use Amazon DynamoDB to perform scalable session handling.
Use Elastic Load Balancer connection draining to stop sending requests to failing instances.
Explanations:
Sticky sessions tie a user’s session to a specific EC2 instance, which means if that instance fails, the session data may be lost unless it’s stored elsewhere.
Amazon SQS is primarily a messaging service and is not designed for session management. It does not provide persistent storage for session data.
Amazon DynamoDB is a fully managed NoSQL database that provides high availability and durability, making it an ideal choice for storing session data. Sessions can be retrieved even if the original EC2 instance fails.
Connection draining helps to gracefully remove instances from a load balancer, but it does not save session data. If a failing instance is not replaced, session data may still be lost.
I map out that the answer is:
Use Amazon DynamoDB to perform scalable session handling.