Vertical vs. Horizontal Scaling: Which is the right answer for your DevOps interview? ?
When a production server hits 98% CPU during a traffic spike, just adding more RAM and CPU (vertical scaling) isn't always the solution. In this video, we break down why vertical scaling can lead to downtime and single points of failure, and why horizontal scaling requires a stateless application to work correctly.
Key Takeaways:
- Diagnose First: Scaling can hide bugs like memory leaks or bad SQL queries. Use tools like `top` to see what is actually consuming resources.
- Go Stateless: Move sessions to a database or Redis and local files to S3 so your app can run on any server without caring which one it is on.
- Automate: Put servers behind a load balancer and use autoscaling rules to handle traffic spikes automatically.
Stop throwing hardware at software problems. Diagnose first, scale second! ?✨
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