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UPD: updated readme

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xpk 2021-01-28 16:52:18 +08:00
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modules/networking/vpc_subnets/README.md
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@ -5,6 +5,21 @@ This module performs the following tasks:
- Create subnets in every AZ
- Create IGW, NGW
## Subnet addressing
This module takes in the VPC cidr. Then add 4 bits to the netmask and divide the cidr into 2 ranges.
First range will be used for private subnet and second for public subnets.
Another 4 bits are added to these ranges for each subnet.
For example, if the VPC cidr is 10.2.0.0/16, the following subnets will be created:
| Subnet Type | Subnet AZ1 | Subnet AZ2 | Subnet AZ3 |
|-------------|------------|------------|------------|
| Private | 10.2.0.0/24 | 10.2.1.0/24 | 10.2.2.0/24 |
| Public | 10.2.16.0/24 | 10.2.17.0/24 | 10.2.18.0/24 |
The VPC cidr netmask should be /20 or above, to produce subnets with /28 netmasks or above.
Subnet smaller than /28 is unlikely useful.
## Inputs:
| Name | Description | Type | Default | Required |
|------|-------------|------|---------|:-----:|