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Improve documentation about the usage of external NAT gateway IPs #66

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Jan 30, 2018
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Improve documentation about the usage of external NAT gateway IPs #66

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3 changes: 2 additions & 1 deletion README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -76,13 +76,14 @@ module "vpc" {

enable_nat_gateway = true
single_nat_gateway = false
reuse_nat_ips = true # <= Skip creation of EIPs for the NAT Gateways
external_nat_ip_ids = ["${aws_eip.nat.*.id}"] # <= IPs specified here as input to the module
}
```

Note that in the example we allocate 3 IPs because we will be provisioning 3 NAT Gateways (due to `single_nat_gateway = false` and having 3 subnets).
If, on the other hand, `single_nat_gateway = true`, then `aws_eip.nat` would only need to allocate 1 IP.
Passing the IPs into the module is done by setting variable `external_nat_ip_ids = ["${aws_eip.nat.*.id}"]`.
Passing the IPs into the module is done by setting two variables `reuse_nat_ips = true` and `external_nat_ip_ids = ["${aws_eip.nat.*.id}"]`.

Terraform version
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