Count

Syntax

resource "aws_vpc" "vpc" {

  count                = 2
  cidr_block           = "10.${count.index}.0.0/16"
  enable_dns_hostnames = var.enable_dns_hostnames
  tags                 = {
    Name = "terraform-vpc-${count.index}"
  }
}

terraform plan

> terraform plan

Terraform used the selected providers to generate the following execution plan. Resource actions are indicated with the following symbols:
  + create

Terraform will perform the following actions:

  # aws_vpc.vpc[0] will be created
  + resource "aws_vpc" "vpc" {
      + arn                                  = (known after apply)
      + cidr_block                           = "10.0.0.0/16"
      + default_network_acl_id               = (known after apply)
      + default_route_table_id               = (known after apply)
      + default_security_group_id            = (known after apply)
      + dhcp_options_id                      = (known after apply)
      + enable_classiclink                   = (known after apply)
      + enable_classiclink_dns_support       = (known after apply)
      + enable_dns_hostnames                 = true
      + enable_dns_support                   = true
      + id                                   = (known after apply)
      + instance_tenancy                     = "default"
      + ipv6_association_id                  = (known after apply)
      + ipv6_cidr_block                      = (known after apply)
      + ipv6_cidr_block_network_border_group = (known after apply)
      + main_route_table_id                  = (known after apply)
      + owner_id                             = (known after apply)
      + tags                                 = {
          + "Company" = "example.com"
          + "Owner"   = "test"
        }
      + tags_all                             = {
          + "Company" = "example.com"
          + "Owner"   = "test"
        }
    }

  # aws_vpc.vpc[1] will be created
  + resource "aws_vpc" "vpc" {
      + arn                                  = (known after apply)
      + cidr_block                           = "10.1.0.0/16"
      + default_network_acl_id               = (known after apply)
      + default_route_table_id               = (known after apply)
      + default_security_group_id            = (known after apply)
      + dhcp_options_id                      = (known after apply)
      + enable_classiclink                   = (known after apply)
      + enable_classiclink_dns_support       = (known after apply)
      + enable_dns_hostnames                 = true
      + enable_dns_support                   = true
      + id                                   = (known after apply)
      + instance_tenancy                     = "default"
      + ipv6_association_id                  = (known after apply)
      + ipv6_cidr_block                      = (known after apply)
      + ipv6_cidr_block_network_border_group = (known after apply)
      + main_route_table_id                  = (known after apply)
      + owner_id                             = (known after apply)
      + tags                                 = {
          + "Company" = "example.com"
          + "Owner"   = "test"
        }
      + tags_all                             = {
          + "Company" = "example.com"
          + "Owner"   = "test"
        }
    }

Plan: 2 to add, 0 to change, 0 to destroy.

─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────

Note: You didn't use the -out option to save this plan, so Terraform can't guarantee to take exactly these actions if you run "terraform apply" now.

Count References

<resource_type>.<name_label>[index].<attribute>

aws_vpc.vpc[0].id

aws_vpc.vpc[*].id # all instance

for example

output "vpc_id" {

  value = aws_vpc.vpc[*].id

}

output:

Changes to Outputs:
  + vpc_id = [
      + (known after apply),
      + (known after apply),
    ]