If My Server Fails, Does My Application Go Down? Learning Availability on AWS
My study notes for the AWS Certified Cloud Practitioner certification: exploring how load balancing, multiple Availability Zones, and Auto Scaling help an application handle failures and changing demand.
What happens if my server fails?
Imagine a small application running on a single Amazon EC2 instance. Everything works—until that instance fails.
Would users still be able to access the application?
As a student preparing for the AWS Certified Cloud Practitioner certification, this question helps me connect cloud concepts to practical situations.
Three concepts I’m learning
- Elastic Load Balancing distributes incoming traffic across targets and uses health checks to route requests to healthy ones.
- Amazon EC2 Auto Scaling helps maintain the desired number of instances and can adjust capacity as demand changes.
- Multiple Availability Zones help reduce dependence on a single location.
Together, these mechanisms can improve availability. However, the application’s database and other dependencies also need attention.
Availability and scalability are different
My study reminder is:
Availability is about staying accessible. Scalability is about handling changes in workload.
A powerful server may handle many users, but it can still be a single point of failure.
My takeaway
For my next practice exercise, I want to explore what happens when one instance becomes unhealthy and how the remaining instances handle requests.
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