AWS- How to estimate a server configuration for nginx load balancer?



  • What kind of parameters can be used to estimate how much memory and the number of CPU cores are required for a load balancer?
    I have a requirement to setup LB based on Nginx to route the traffic to other nodes via TCP/IP as on other nodes that have PHP-FPM installed. SSL will terminate at Nginx and traffic to nodes is to be based on just HTTP. Max timeout to be five minutes.

    I am unable to understand how many requests this Nginx LB can swiftly serve while running on a c6gn.medium (1vCPU,2GB Memory, network bandwidth up to 25GBPS) which is CPU optimized and a t4g.medium which is a burstable instance having 2 vCPU and 4GB memory. Cheers!



  • There are 2 ways I can think of to solve this problem:

    • You can use your own data points from your own experience or others: One datapoint I can provide is ~70,000 sessions per month, probably 50 connections per page request, 1MB page size and maybe 1.5-2 pages per session was running on Nginx 1.14 on a t3.medium. I don't recall ever getting charged for CPU credits, so the CPU usage can't have been ever above 20% over 24h. I do recall upgrading from t3.small at some point, so it must have been memory usage. ~200 vhosts and their TLS certificates.

    • You can use Route53 weighted routing and distribute the traffic to say a c6gn.xlarge (to be super save) and a t4g.medium and then slowly dial up the percentages and watch CPU, memory, network and disk throughput until you notice bottlenecks.




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