add usage, update document

it-linux-base/README.md

@@ -1,3 +1,23 @@
+# About it-linux-base
+
+This describes how to use the aws-common-security-groups submodule for it-linux-base.
+
+Commonly used ports and services are set up here, including ICMP, SSH, NTP, DNS, SNMP,  
+monit, munin, iperf, netperf, NetBackup and Opsware.
+
+## Usage
+
+```hcl
+module "it-linux-base" {
+  source = "git@github.e.it.census.gov:terraform-modules/aws-common-security-groups.git//it-linux-base"
+
+  # name = "m-it-linux-base"
+  vpc_id = var.vpc_id
+  # Name, CostAllocation, and Environment are pre-set, but they can be overriden
+  # tags = { }
+}
+```
+
 ## Requirements
 
 The following requirements are needed by this module:
@@ -151,40 +171,3 @@ Description: Created security group ARN
 
 Description: Created security group ID
 
-## Requirements
-
-| Name | Version |
-|------|---------|
-| terraform | >= 0.12 |
-
-## Providers
-
-| Name | Version |
-|------|---------|
-| aws | n/a |
-
-## Inputs
-
-| Name | Description | Type | Default | Required |
-|------|-------------|------|---------|:--------:|
-| \_module\_version | Module version number | `string` | `"1.0.1"` | no |
-| description | Security Group Description | `string` | `"Linux Common Base Security Group"` | no |
-| egress\_networks | List of egress networks (all ports) | `list(string)` | <pre>[<br>  "0.0.0.0/0"<br>]</pre> | no |
-| egress\_security\_groups | List of egress security groups (all ports) | `list(string)` | `[]` | no |
-| enable\_self | Enable\|Disable self full access | `bool` | `false` | no |
-| ingress\_networks | List of ingress networks for external access (not all ports) | `list(string)` | <pre>[<br>  "0.0.0.0/0"<br>]</pre> | no |
-| ingress\_security\_groups | List of ingress security groups for all ports | `list(string)` | `[]` | no |
-| name | Security Group Name | `string` | `"it-linux-base"` | no |
-| short\_description | Security Group Short Description | `string` | `"Linux"` | no |
-| tags | Extra security group tags | `map` | <pre>{<br>  "CostAllocation": "csvd:infrastructure",<br>  "Environment": "csvd-infrastructure"<br>}</pre> | no |
-| use\_vpc\_cidr | Enable\|Disable use of VPC CIDR block in the ingress\_networks | `bool` | `false` | no |
-| vpc\_full\_name | VPC Name | `string` | `""` | no |
-| vpc\_id | VPC ID Number | `string` | n/a | yes |
-
-## Outputs
-
-| Name | Description |
-|------|-------------|
-| this\_security\_group\_arn | Created security group ARN |
-| this\_security\_group\_id | Created security group ID |
-

it-linux-base/main.tf

@@ -1,3 +1,25 @@
+/**
+* # About it-linux-base
+*
+* This describes how to use the aws-common-security-groups submodule for it-linux-base. 
+*
+* Commonly used ports and services are set up here, including ICMP, SSH, NTP, DNS, SNMP,
+* monit, munin, iperf, netperf, NetBackup and Opsware.
+*
+* ## Usage
+*
+* ```hcl
+* module "it-linux-base" {
+*   source = "git@github.e.it.census.gov:terraform-modules/aws-common-security-groups.git//it-linux-base"
+*
+*   # name = "m-it-linux-base"
+*   vpc_id = var.vpc_id
+*   # Name, CostAllocation, and Environment are pre-set, but they can be overriden
+*   # tags = { }
+* }
+* ```
+*/
+
 data "aws_vpc" "this_vpc" {
   count = var.use_vpc_cidr ? 1 : 0
   id    = var.vpc_id