使用AWS Fargate与Lambda能否实现EC2级别的硬件物理隔离？
Great question—physical isolation is often critical for compliance, sensitive workloads, or strict security requirements, so it makes sense you’d want that without the EC2 maintenance overhead. Let’s break this down for both Lambda and Fargate:
Lambda: No Physical Isolation Option
Lambda is built as a fully serverless, shared-resource service. While AWS enforces strong logical isolation between your functions and other users’ (including memory partitioning, CPU time slicing, and secure execution boundaries), there’s no way to request physical isolation for your Lambda functions.
AWS runs Lambda functions on shared EC2 instances across multiple customers (using firecracker microVMs for tight logical separation). There’s no dedicated host or physical server allocation option for Lambda—this is part of the tradeoff for its extreme scalability and zero-maintenance model.
Fargate: Yes, Physical Isolation is Possible
Fargate, on the other hand, does offer a way to get physical isolation while keeping the fully managed, no-maintenance benefit. Here’s how:
- Fargate Dedicated Capacity: You can purchase dedicated compute capacity (measured in vCPUs) reserved exclusively for your ECS or EKS workloads. When you configure a Fargate Capacity Provider with dedicated capacity, your containers will only run on physical servers allocated solely to your AWS account. This matches the physical isolation level of EC2 Dedicated Hosts, but you don’t have to manage the underlying servers at all—AWS handles all patching, scaling, and infrastructure maintenance.
To set this up, you’d:
- Create a dedicated capacity provider in ECS/EKS, specifying the amount of vCPU capacity you need.
- Associate your task definitions or clusters with this capacity provider.
- All tasks launched with this configuration will run on your isolated physical hosts.
Key Takeaway
- If physical isolation is non-negotiable, Fargate with Dedicated Capacity is your best bet—it gives you the same hardware-level isolation as dedicated EC2 instances without the maintenance work.
- Lambda can’t provide physical isolation today, so it’s not a fit if you need strict hardware separation from other users.
内容的提问来源于stack exchange，提问作者Cui Pengfei 崔鹏飞
