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* Added new variables to allow the number of public or private subnets to be specified. * Added option to create 0 to many subnets for each subnet type (public or private). Added Example * set the dynamic subnet length to match the number of provided az's if any provided * updated availability_zone variable description * Added region back in, updated the description to show that there is a nested aws provider within the module * Added region back in, updated the description to show that there is a nested aws provider within the module * Created availability_zones.tf and moves availability zone data and locals in to it. Moved the public and private subnet locals into public.tf and private.tf. * Fixed a miscalculated value for labeling the nat instances by az * removed outdated comment
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| Original file line number | Diff line number | Diff line change |
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| data "aws_availability_zones" "available" {} | ||
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| locals { | ||
| ## If the variable availability_zones is empty, use the list provided by data.aws_availability_zones.available.names | ||
| ## Otherwise use the zones listed in availability_zones | ||
| az_name_map = { | ||
| "0" = ["${data.aws_availability_zones.available.names}"] | ||
| "1" = ["${var.availability_zones}"] | ||
| } | ||
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| availability_zones = "${local.az_name_map[signum(length(var.availability_zones))]}" | ||
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| ## This selects one of the lists based on the signum() interpolation | ||
| az_map = { | ||
| "-1" = ["${data.aws_availability_zones.available.names}"] | ||
| "1" = ["${local.availability_zones}"] | ||
| "0" = [] | ||
| } | ||
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| ## Select the az from the list using a function like `local.availability_zones_public[count.index % length(local.availability_zones_public)]` | ||
| availability_zones_public = "${local.az_map[signum(local.public_subnet_count)]}" | ||
| availability_zones_private = "${local.az_map[signum(local.private_subnet_count)]}" | ||
| } | ||
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| ## This should be depreciated in the future. | ||
| locals { | ||
| max_subnets_map = { | ||
| "-1" = "${length(local.availability_zones)}" | ||
| "0" = "0" | ||
| "1" = "${var.max_subnet_count}" | ||
| } | ||
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| max_subnet_count = "${local.max_subnets_map[signum(var.max_subnet_count)]}" | ||
| } |
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| ## This example demonstrates it use as if it was being used | ||
| ## for some Spinnaker (spinnaker.io) deployment | ||
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| module "dynamic_subnets" { | ||
| source = "./.." | ||
| context = "${module.label.context}" | ||
| tags = "${merge(module.label.tags, local.subnet_tags)}" | ||
| region = "${data.aws_region.current.name}" | ||
| availability_zones = ["${data.aws_region.current.name}a", "${data.aws_region.current.name}b"] // Optional list of AZ's to restrict it to | ||
| vpc_id = "${module.vpc.vpc_id}" | ||
| igw_id = "${module.vpc.igw_id}" | ||
| public_subnet_count = "2" // Two public zones for the load balancers | ||
| private_subnet_count = "4" // Four private zones for the | ||
| map_public_ip_on_launch = "true" | ||
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| ## You can use nat_gateway_enabled or nat_instance_enabled | ||
| ## It creates one nat instance per public subnet. | ||
| ## So if you want to exclude the public subnet by setting the public_subnet_count to 0 | ||
| ## You will neet to use the nat_gateway_enabled option. | ||
| nat_instance_enabled = "true" | ||
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| nat_gateway_enabled = "false" | ||
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| ## Optionally customising a tag based on whether it is public or private | ||
| ## will format like this: "immutable_metadata": {"purpose": \"public-subnet\"}" | ||
| subnet_type_tag_key = "immutable_metadata" | ||
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| subnet_type_tag_value_format = "{\"purpose\": \"%s-subnet\"}" // The %s gets replaced with 'public' on public subnets and 'private' on private subnets | ||
| } | ||
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| ## VPC module doesn't have the latest version of null_label | ||
| ## module integrated with it at the time of this example being | ||
| ## written so no context variable here. | ||
| module "vpc" { | ||
| source = "git::https://github.com/cloudposse/terraform-aws-vpc.git?ref=tags/0.4.1" | ||
| namespace = "${module.label.namespace}" | ||
| stage = "${module.label.environment}" | ||
| name = "${module.label.name}" | ||
| attributes = ["${module.label.attributes}"] | ||
| delimiter = "${module.label.delimiter}" | ||
| tags = "${module.label.tags}" | ||
| cidr_block = "${var.vpc_cidr}" | ||
| } | ||
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| data "aws_region" "current" {} | ||
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| module "label" { | ||
| source = "git::https://github.com/cloudposse/terraform-null-label.git?ref=tags/0.11.1" | ||
| namespace = "cp" | ||
| environment = "prod" | ||
| delimiter = "-" | ||
| name = "spinnaker" | ||
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| tags = { | ||
| "ManagedBy" = "Terraform" | ||
| "ModuleBy" = "CloudPosse" | ||
| } | ||
| } | ||
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| variable "eks_cluster_name" { | ||
| description = "The name of the EKS cluster that will be utilising this network(if any)" | ||
| default = "my-main-eks-cluster" | ||
| } | ||
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| variable "vpc_cidr" { | ||
| default = "10.0.0.0/16" | ||
| } | ||
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| locals { | ||
| # Spinnaker subnet tags | ||
| subnet_tags = { | ||
| "kubernetes.io/cluster/${var.eks_cluster_name}" = "shared" | ||
| "kubernetes.io/role/elb" = "" | ||
| "kubernetes.io/role/internal-elb" = "" | ||
| } | ||
| } | ||
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| provider "aws" { | ||
| version = "~> 2.12" | ||
| region = "us-west-2" | ||
| skip_requesting_account_id = true # this can be tricky | ||
| skip_get_ec2_platforms = true | ||
| skip_metadata_api_check = true | ||
| skip_region_validation = true | ||
| skip_credentials_validation = true | ||
| } |
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