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Networking is fundamental to running containers in production. Your tasks need to receive traffic, communicate with each other, access databases, and connect to the internet — all securely. This lesson covers ECS networking modes, load balancer integration, service discovery, and network architecture patterns.
ECS supports several network modes, each with different trade-offs:
Every task gets its own Elastic Network Interface (ENI) with a private IP address from your VPC. This is the default for Fargate and the recommended mode for EC2 as well.
VPC (10.0.0.0/16)
├── Subnet A (10.0.1.0/24)
│ ├── Task 1 — ENI → 10.0.1.15
│ └── Task 2 — ENI → 10.0.1.22
└── Subnet B (10.0.2.0/24)
├── Task 3 — ENI → 10.0.2.8
└── Task 4 — ENI → 10.0.2.31
Advantages:
Consideration: Each ENI consumes an IP address from your subnet. For large deployments, ensure your subnets have enough IP addresses.
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