I've been noticing our data transfer bills are really high lately. We're currently using several AWS services: our OpenSearch is in a VPC, and we're also using ElastiCache along with a load balancer and a NAT Gateway. Our containers are running on ECS Fargate across all three availability zones. I just found out that inter-AZ traffic incurs costs, and not all our services are distributed across all AZs. Right now, we only have a single NAT Gateway, so I'm wondering if it would actually be more cost-effective to run these services in every AZ. We've set up an S3 Gateway in our VPC already to help lower costs. Currently, we're seeing about 150-600 MB/s going through our NAT Gateway in both directions. Any advice on optimizing this?
3 Answers
It seems odd to have all that internal traffic going through your NAT Gateway. Are your Fargate containers accessing these services with private IPs? If they aren't, that's likely where your costs are piling up. Utilizing the private addresses could save you a lot!
Data transfer over a NAT Gateway can really add up quickly! You might want to consider using alternatives like 'fck-nat' to handle traffic more efficiently. It'll help you save on those costly NAT charges.
At your current transfer rates, you should definitely check out AlterNAT. It’s an open-source solution built by Chime Financial that might help replace the NAT Gateway. I wrote a bit about it—it's worth a look!
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