Cost optimisation on AWS: Navigating NAT Charges with Private ECS Tasks on Fargate

Working on a new project recently, I delved into deploying ECS Fargate containers in private subnets. The goal in this case was to have ECS Fargate containers deployed in private subnets, which allowed ingress only through an Application Load Balancer. We chose this configuration primarily for security and firewall configuration reasons. Cost optimization was also an important consideration for this architecture.

The containers also needed egress access to other (non AWS) services, and this is allowed through a NAT Gateway. …

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