Created
November 16, 2021 22:14
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Create multi-az VPC in AWS w/ Terraform and _not_ specifying individual zones
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provider "aws" { | |
region = "us-west-2" | |
profile = "md-sandbox" | |
} | |
resource "aws_s3_bucket" "dont_create_me_in_same_script_obvi" { | |
bucket = "terraform-provisioning-cache" | |
acl = "private" | |
} | |
data "aws_availability_zones" "available" { | |
state = "available" | |
} | |
data "aws_s3_bucket_objects" "aws_availability_zones_cache_exists" { | |
bucket = aws_s3_bucket.dont_create_me_in_same_script_obvi.id | |
prefix = local.vpc_az_cache_key | |
} | |
locals { | |
vpc_az_cache_key = "orgId/pkgId/vpc-availability-zones.json" | |
cache_keys = data.aws_s3_bucket_objects.aws_availability_zones_cache_exists.keys | |
cache_exists = length(local.cache_keys) > 0 | |
zones_json = jsonencode(data.aws_availability_zones.available.names) | |
availability_cache = local.cache_exists ? data.aws_s3_bucket_object.aws_availability_zones_cache_reader[0].body : local.zones_json | |
} | |
# The object keys should be a unique value for the terraform run (org/pkg/cache-key-name) | |
data "aws_s3_bucket_object" "aws_availability_zones_cache_reader" { | |
count = local.cache_exists ? 1 : 0 | |
bucket = aws_s3_bucket.dont_create_me_in_same_script_obvi.id | |
key = local.vpc_az_cache_key | |
} | |
resource "aws_s3_bucket_object" "aws_availability_zones_cache_reader" { | |
tags = {} | |
metadata = {} | |
content_type = "application/json" | |
bucket = aws_s3_bucket.dont_create_me_in_same_script_obvi.id | |
key = local.vpc_az_cache_key | |
content = local.availability_cache | |
etag = md5(local.availability_cache) | |
} | |
output "resource-availability_cache" { | |
value = aws_s3_bucket_object.aws_availability_zones_cache_reader.content | |
} | |
output "local-availability_cache" { | |
value = local.availability_cache | |
} | |
output "did_cache_exist" { | |
value = local.cache_exists | |
} |
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