Interview Q&A / AWS & Cloud
AWS & Cloud interview questions
EC2, S3, Lambda, IAM and VPC basics, with when to pick which service.
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- How do an Auto Scaling group and a load balancer work together on AWS?
An Auto Scaling group keeps the right number of healthy EC2 instances running, adding or removing them based on policies such as target CPU. A load balancer spreads incoming traffic across those instances in multiple AZs. The ASG registers new instances with the load balancer's target group and replaces any that fail health checks.
AdvancedIn-depth4 min read - Can you use Spot Instances inside an Auto Scaling group, and how do you do it safely?
Yes. A mixed instances policy lets an ASG combine On-Demand and Spot across several instance types. Keep a small On-Demand base, spread Spot across types and AZs, and make the app handle the two-minute interruption notice.
AdvancedQuick answer1 min read