Container architecture
ECS vs Fargate
Should you manage your own EC2 instances with ECS, or let Fargate handle the infrastructure? Compare both options side-by-side and get a tailored recommendation based on your workload.
ECS on EC2
Fargate
Pricing Model
ECS on EC2
Pay for EC2 instances whether tasks fill them or not. Savings Plans & Reserved Instances available for predictable workloads.
Fargate
Pay per vCPU and memory per second, only while your task runs. Simpler billing, but higher unit price at scale.
Pay for EC2 instances whether tasks fill them or not. Savings Plans & Reserved Instances available for predictable workloads.
Pay per vCPU and memory per second, only while your task runs. Simpler billing, but higher unit price at scale.
Scaling
ECS on EC2
Two layers: Auto Scaling for EC2 capacity + ECS Service Auto Scaling for tasks. More knobs, more control.
Fargate
Single layer: ECS Service Auto Scaling manages tasks. AWS provisions compute automatically — no capacity planning.
Two layers: Auto Scaling for EC2 capacity + ECS Service Auto Scaling for tasks. More knobs, more control.
Single layer: ECS Service Auto Scaling manages tasks. AWS provisions compute automatically — no capacity planning.
Startup Time
ECS on EC2
Tasks start quickly on pre-warmed instances. Scaling out new EC2s takes 1-3 minutes.
Fargate
Tasks typically start in 15-45 seconds. No instance warm-up, but cold-start can be noticeable for bursty workloads.
Tasks start quickly on pre-warmed instances. Scaling out new EC2s takes 1-3 minutes.
Tasks typically start in 15-45 seconds. No instance warm-up, but cold-start can be noticeable for bursty workloads.
Operational Overhead
ECS on EC2
You manage AMIs, patching, monitoring, and draining instances. Full control means full responsibility.
Fargate
AWS manages the underlying hosts. No OS patching, no SSH — significantly less operational burden.
You manage AMIs, patching, monitoring, and draining instances. Full control means full responsibility.
AWS manages the underlying hosts. No OS patching, no SSH — significantly less operational burden.
Networking
ECS on EC2
Supports both bridge and awsvpc networking modes. More flexibility for advanced network topologies.
Fargate
awsvpc only — every task gets its own ENI. Simpler model but can hit ENI limits in large deployments.
Supports both bridge and awsvpc networking modes. More flexibility for advanced network topologies.
awsvpc only — every task gets its own ENI. Simpler model but can hit ENI limits in large deployments.
GPU / Custom Hardware
ECS on EC2
Full access to GPU instances (P, G families), custom AMIs, and any EC2 instance type.
Fargate
No GPU support. Limited to standard vCPU/memory configurations — no custom hardware or kernel modules.
Full access to GPU instances (P, G families), custom AMIs, and any EC2 instance type.
No GPU support. Limited to standard vCPU/memory configurations — no custom hardware or kernel modules.
Cost at Scale
ECS on EC2
Lower per-unit cost at high utilization. Bin-packing + Reserved Instances can cut costs 40-60%.
Fargate
Premium pricing adds up with hundreds of tasks. Fargate Spot can help, but savings are less predictable.
Lower per-unit cost at high utilization. Bin-packing + Reserved Instances can cut costs 40-60%.
Premium pricing adds up with hundreds of tasks. Fargate Spot can help, but savings are less predictable.
Debugging & SSH Access
ECS on EC2
Full SSH access to instances. Attach to containers, inspect logs, run diagnostics directly on the host.
Fargate
No SSH. Use ECS Exec for interactive sessions, but access is more limited than a full host shell.
Full SSH access to instances. Attach to containers, inspect logs, run diagnostics directly on the host.
No SSH. Use ECS Exec for interactive sessions, but access is more limited than a full host shell.
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