A read only news reporting site with a combined web and application tier and a database tier that receives large
and unpredictable traffic demands must be able to respond to these traffic fluctuations automatically. What
AWS services should be used meet these requirements?
A.
Stateless instances for the web and application tier synchronized using ElastiCache Memcached in an
autoscaimg group monitored with CloudWatch and RDS with read replicas.
B.
Stateful instances for the web and application tier in an autoscaling group monitored with CloudWatch and
RDS with read replicas.
C.
Stateful instances for the web and application tier in an autoscaling group monitored with CloudWatch. And
multi-AZ RDS.
D.
Stateless instances for the web and application tier synchronized using ElastiCache Memcached in an
autoscaling group monitored with CloudWatch and multi-AZ RDS.
A.
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if you have thought whats stateful and stateless instances?
Stateless VS stateful Instances
Ideally you want to be dealing with a stateless application, where terminating one node won’t produce side effects on user experience. Typical stateless apps include frontend web servers or any app that doesn’t rely on keeping session state in memory.
Unfortunately not all software is created equal. Our use case is a video recorder for web based meetings. While the presenter is discussing slides, the recorder is watching the presentation unfolding real time.
Try to terminate one instance with active sessions and you’re impacting user experience. But there is a solution to which we’ll come back shortly.
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