Optimal size for controlplane subnet in EKS

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What should be the optimal size for control plane subnet ID's while provisioning an EKS cluster.

Is /27 or ~30 usable hosts an acceptable size?

control_plane_subnet_ids 
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Accepted Answer

The subnets must each have at least six IP addresses for use by Amazon EKS. However, we recommend at least 16 IP addresses.

https://docs.aws.amazon.com/eks/latest/userguide/network_reqs.html

But remember that you will have nodes. They require much more IPs, especially when your env is scaled much

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answered 9 months ago
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  • in my terraform eks module, there are two fields:

    1. subnet_ids
    2. control_plane_subnet_ids

    I will provide the subnets for the nodes separately. So if I give /27 subnet to controlplane per zone, It should be enough?

  • /27 netmask = 32 IPs in general. In the case of AWS, it's 27 IPs available for allocation (because 5 IPs are booked by VPC), so 27 IPs should be enough

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