Optimal size for controlplane subnet in EKS

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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asked 13 days ago170 views

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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.

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

EXPERT

answered 13 days ago

EXPERT

reviewed 13 days ago

aws_ninja
13 days ago
in my terraform eks module, there are two fields:

subnet_ids

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?
Oleksii Bebych EXPERT
12 days ago
/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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