Private subnets with NAT Gateway in VPC Terraform Module

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A Terraform module to create private subnets with NAT Gateway in VPC in AWS.

Make sure that you don't hit soft-limit of EIP per VPC.

If you want to create public and private subnets using single module you can use tf_aws_vpc module.

Module Input Variables

• name - Name (optional)
• vpc_id - VPC id
• cidrs - List of private subnet CIDR blocks
• azs - List of availability zones
• public_subnet_ids - List of public subnet ids where NAT gateway will be created
• nat_gateways_count - Number of NAT gateways to create (should be at least 1). For high-availability make it equal to public subnets.
• map_public_ip_on_launch - Boolean that controls the subnets ability to assign public ip addresses (default=true).
• tags - dictionary of tags that will be added to resources created by the module

Usage

module "private_subnet" {
  source             = "github.com/terraform-community-modules/tf_aws_private_subnet_nat_gateway"

  name               = "production-private"
  vpc_id             = "vpc-12345678"
  cidrs              = ["10.4.1.0/24", "10.4.2.0/24", "10.4.3.0/24"]
  azs                = ["eu-west-1a", "eu-west-1b", "eu-west-1c"]
  public_subnet_ids  = ["subnet-123abcde", "subnet-456abcde", "subnet-789abcde"]
  nat_gateways_count = 3    # can be between 1 and "number of public subnets".

  tags {
      "Terraform" = "true"
      "Environment" = "${var.environment}"
  }
}

Outputs

• subnet_ids - List of private subnet ids
• private_route_table_ids - List of route table ids
• nat_eips - List of NAT gateways EIPs

Authors

Originally created and maintained by Anton Babenko.

License

Apache 2 Licensed. See LICENSE for full details.