I want to use Terraform to create a new subnet for EKS. In the same account, the VPC has already been created and some subnets have been created.
locals {
vpc_cidr_block = "10.148.52.0/22"
public_subnets = [
"10.148.52.0/27",
"10.148.54.0/27",
]
# ...
private_subnets_3 = [
"10.148.52.80/28",
"10.148.54.80/28",
]
subnets_4 = [
"10.148.52.240/28",
"10.148.54.240/28",
]
eks_private_subnets = [
"10.148.52.128/25",
"10.148.54.128/25",
]
}
resource "aws_subnet" "eks_private" {
count = length(local.eks_private_subnets)
vpc_id = aws_vpc.this.id
cidr_block = local.eks_private_subnets[count.index]
availability_zone = local.azs[count.index]
}
When run the deployment, it got these errors:
Error: error creating subnet: InvalidSubnet.Conflict: The CIDR '10.148.54.128/25' conflicts with another subnet
status code: 400, request id: 11111111111-111111-1111111-1111111111111
on main.tf line 50, in resource "aws_subnet" "eks_private":
50: resource "aws_subnet" "eks_private" {
Error: error creating subnet: InvalidSubnet.Conflict: The CIDR '10.148.52.128/25' conflicts with another subnet
status code: 400, request id: 22222222222-222222-22222-222222222222222
on network.tf line 50, in resource "aws_subnet" "eks_private":
50: resource "aws_subnet" "eks_private" {
It seems the .128/25 size is conflicts with other subnet. But I want to create a /25 size subnet in this VPC, isn't it possible? Otherwise, may I need to create a new VPC to use?
