What is AWS Elastic Beanstalk?
Why Interviewers Ask This
This is a classic screening question for AWS / Cloud Computing roles. Hiring managers ask it early in interviews to gauge your baseline understanding and determine if you can communicate technical concepts clearly.
Answer
AWS Elastic Beanstalk is a Platform as a Service (PaaS) that simplifies deploying and scaling web applications. You upload your code; Beanstalk handles deployment, capacity provisioning, load balancing, auto-scaling, and application health monitoring. Supported platforms: Node.js, Python, Ruby, PHP, Java (Tomcat), .NET, Go, Docker (single and multi-container). How it works: create an application → create an environment (web server or worker tier) → deploy code (ZIP, WAR, Docker image) → Beanstalk provisions: EC2 instances (Auto Scaling group), Load Balancer (optional), RDS (optional), S3 (for code + logs), CloudWatch alarms. Deployment policies: All at once (fast, downtime); Rolling (no downtime, reduced capacity during update); Rolling with additional batch (no capacity reduction, extra cost); Immutable (new instances with new version — safest, most expensive); Traffic splitting (canary testing). Environments: Blue/Green deployments by swapping environment URLs. Customization: .ebextensions/ folder with config files — install packages, run scripts, set environment variables, configure load balancer. beanstalk.env: set environment variables. Managed updates: automatically applies platform updates. Monitoring: health dashboard, enhanced health monitoring, CloudWatch integration. Cost: no additional charge for Beanstalk — pay only for underlying resources (EC2, ELB, etc.). vs EC2 directly: Beanstalk for quick deployment without infrastructure management; EC2 for full control. Recommended for development teams that want simpler deployment without Kubernetes complexity.
Common Mistake
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