aws-lambda-managed-instances

Lambda Managed Instances (LMI) run Lambda on EC2 with AWS-managed capacity. LMI handles provisioning and scaling across multiple AZs, providing consistent provisioned capacity and controlled concurrency for predictable performance.

Configure capacity providers and tune memory-to-vCPU ratios to manage Lambda Managed Instances. Set PerExecutionEnvironmentMaxConcurrency to achieve predictable performance and control concurrency across your execution environments.

Migrate to Lambda Managed Instances for workloads requiring reduced cold starts, consistent provisioned capacity, and controlled concurrency across multiple AZs. Use LMI when standard Lambda scaling behavior cannot meet predictable performance requirements.

Compare Lambda Managed Instances costs against standard Lambda by evaluating Savings Plans or Reserved Instances. Cost comparisons help plan migrations by analyzing provisioned EC2-based capacity expenses versus standard serverless execution pricing.

Migrating a Lambda function to LMI requires configuring IAM roles, VPC access, and versioning. You publish a version to provision capacity, addressing architecture decisions and monitoring guidance with minimal code changes and clear cutover planning.