A terraform module that takes a simple approach to setting up a VPC with all the dozens of related resources in only ~100 lines of code.
- Creates VPC, NAT gateways, routing tables, routes. Up to 10 private, and 10 public, subnets-per-AZ based on your input.
- Automatically discover availability zones.
- Automatically calculate CIDR ranges based on quantity of availability zones and the size you want the subnets to be.
- Create two NAT Gateways and assign them to subnets on an odd/even basis for multi-AZ.
- Resists the temptation to allow for snowflake customization features like VPC Peering, VPN routing, DHCP Options, etc. Keep it simple, when possible.
resource "aws_instance" "web" {
ami = "${data.aws_ami.ubuntu.id}"
instance_type = "t2.micro"
vpc_security_group_ids = ["${module.vpc.default_security_group"]
subnet_id = "${element(module.vpc.private_subnet_ids["private"],0)}"
}
resource "aws_lb" "test" {
name = "test-lb-tf"
internal = false
load_balancer_type = "application"
security_groups = ["${module.vpc.default_security_group"]
subnets = ["${module.vpc.public_subnet_ids["public"]}"]
}
Supported module outputs are:
default_security_group_id
(string)private_subnet_ids
(map)public_subnet_ids
(map)vpc_id
(string)
Example console output with these custom variables defined:
private_subnet_nametags = ["app1", "app2", "db"]
public_subnet_nametags = ["lb", "bastion"]
default_security_group_id = sg-286b0e60
private_subnet_ids = {
app1 = [subnet-17f47c5d subnet-4833f614 subnet-b774b8d0 subnet-9d8543b3 subnet-eb9884d4 subnet-5548dd5a]
app2 = [subnet-a39584c7 subnet-f512b3fa subnet-95c7eaaa subnet-3ca49461 subnet-a14d7f8e subnet-d7ff3b9d]
db = [subnet-884476a7 subnet-8014b58f subnet-2bf33761 subnet-b8cfe287 subnet-bca090e1 subnet-9f9e8ffb]
unused3 = []
unused4 = []
unused5 = []
unused6 = []
unused7 = []
unused8 = []
unused9 = []
}
public_subnet_ids = {
lb = [subnet-b5fe76ff subnet-7923e625 subnet-1d7fb37a subnet-767dba58 subnet-05e1fd3a subnet-fc58cdf3]
bastion = [subnet-c02509ef subnet-472b2523 subnet-7c01f636 subnet-4f614312 subnet-626db46d subnet-2b9cc614]
unused2 = []
unused3 = []
unused4 = []
unused5 = []
unused6 = []
unused7 = []
unused8 = []
unused9 = []
}
vpc_id = vpc-e9f1cc92