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https://github.com/cloudposse/terraform-aws-named-subnets

DEPRECATED (use cloudposse/terraform-aws-dynamic-subnets instead): Terraform module for named subnets provisioning.
https://github.com/cloudposse/terraform-aws-named-subnets
availability-zone aws calculator cidr dynamic hcl2 subnet terraform-module vpc
Last synced: 2 days ago
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DEPRECATED (use cloudposse/terraform-aws-dynamic-subnets instead): Terraform module for named subnets provisioning.
Host: GitHub
URL: https://github.com/cloudposse/terraform-aws-named-subnets
Owner: cloudposse
License: apache-2.0
Created: 2017-10-18T14:24:51.000Z (about 7 years ago)
Default Branch: main
Last Pushed: 2024-07-24T03:03:39.000Z (4 months ago)
Last Synced: 2024-07-24T05:08:45.321Z (4 months ago)
Topics: availability-zone, aws, calculator, cidr, dynamic, hcl2, subnet, terraform-module, vpc
Language: HCL
Homepage: https://cloudposse.com/accelerate
Size: 2.11 MB
Stars: 47
Watchers: 21
Forks: 31
Open Issues: 7
Metadata Files:
- Readme: README.md
- License: LICENSE
- Codeowners: .github/CODEOWNERS
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README

        




    




Terraform module for named [`subnets`](http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_Subnets.html) provisioning.

> [!TIP]

> #### 👽 Use Atmos with Terraform

> Cloud Posse uses [`atmos`](https://atmos.tools) to easily orchestrate multiple environments using Terraform. 


> Works with [Github Actions](https://atmos.tools/integrations/github-actions/), [Atlantis](https://atmos.tools/integrations/atlantis), or [Spacelift](https://atmos.tools/integrations/spacelift).

>

> 

> Watch demo of using Atmos with Terraform

> 


> Example of running atmos to manage infrastructure from our Quick Start tutorial.

> 

## Usage

Simple example, with private and public subnets in one Availability Zone:

```hcl

module "vpc" {

  source = "cloudposse/vpc/aws"

  # Cloud Posse recommends pinning every module to a specific version

  # version     = "x.x.x"

  namespace  = "eg"

  name       = "vpc"

  stage      = "dev"

  cidr_block = var.cidr_block

}

locals {

  public_cidr_block  = cidrsubnet(module.vpc.vpc_cidr_block, 1, 0)

  private_cidr_block = cidrsubnet(module.vpc.vpc_cidr_block, 1, 1)

}

module "public_subnets" {

  source = "cloudposse/named-subnets/aws"

  # Cloud Posse recommends pinning every module to a specific version

  # version     = "x.x.x"

  namespace         = "eg"

  stage             = "dev"

  name              = "app"

  subnet_names      = ["web1", "web2", "web3"]

  vpc_id            = module.vpc.vpc_id

  cidr_block        = local.public_cidr_block

  type              = "public"

  igw_id            = module.vpc.igw_id

  availability_zone = "us-east-1a"

}

module "private_subnets" {

  source = "cloudposse/named-subnets/aws"

  # Cloud Posse recommends pinning every module to a specific version

  # version     = "x.x.x"

  namespace         = "eg"

  stage             = "dev"

  name              = "database"

  subnet_names      = ["kafka", "cassandra", "zookeeper"]

  vpc_id            = module.vpc.vpc_id

  cidr_block        = local.private_cidr_block

  type              = "private"

  availability_zone = "us-east-1a"

  ngw_id            = module.public_subnets.ngw_id

}

```

Simple example, with `ENI` as default route gateway for private subnets

```hcl

resource "aws_network_interface" "default" {

  subnet_id         = module.us_east_1b_public_subnets.subnet_ids[0]

  source_dest_check = false

  tags              = module.network_interface_label.id

}

module "us_east_1b_private_subnets" {

  source = "cloudposse/named-subnets/aws"

  # Cloud Posse recommends pinning every module to a specific version

  # version     = "x.x.x"

  namespace         = "eg"

  stage             = "dev"

  name              = "app"

  subnet_names      = ["charlie", "echo", "bravo"]

  vpc_id            = module.vpc.vpc_id

  cidr_block        = local.us_east_1b_private_cidr_block

  type              = "private"

  availability_zone = "us-east-1b"

  eni_id            = aws_network_interface.default.id

  attributes        = ["us-east-1b"]

}

```

Full example, with private and public subnets in two Availability Zones for High Availability:

```hcl

module "vpc" {

  source = "cloudposse/vpc/aws"

  # Cloud Posse recommends pinning every module to a specific version

  # version     = "x.x.x"

  namespace  = "eg"

  name       = "vpc"

  stage      = "dev"

  cidr_block = var.cidr_block

}

locals {

  us_east_1a_public_cidr_block  = cidrsubnet(module.vpc.vpc_cidr_block, 2, 0)

  us_east_1a_private_cidr_block = cidrsubnet(module.vpc.vpc_cidr_block, 2, 1)

  us_east_1b_public_cidr_block  = cidrsubnet(module.vpc.vpc_cidr_block, 2, 2)

  us_east_1b_private_cidr_block = cidrsubnet(module.vpc.vpc_cidr_block, 2, 3)

}

module "us_east_1a_public_subnets" {

  source = "cloudposse/named-subnets/aws"

  # Cloud Posse recommends pinning every module to a specific version

  # version     = "x.x.x"

  namespace         = "eg"

  stage             = "dev"

  name              = "app"

  subnet_names      = ["apples", "oranges", "grapes"]

  vpc_id            = module.vpc.vpc_id

  cidr_block        = local.us_east_1a_public_cidr_block

  type              = "public"

  igw_id            = module.vpc.igw_id

  availability_zone = "us-east-1a"

  attributes        = ["us-east-1a"]

}

module "us_east_1a_private_subnets" {

  source = "cloudposse/named-subnets/aws"

  # Cloud Posse recommends pinning every module to a specific version

  # version     = "x.x.x"

  namespace         = "eg"

  stage             = "dev"

  name              = "app"

  subnet_names      = ["charlie", "echo", "bravo"]

  vpc_id            = module.vpc.vpc_id

  cidr_block        = local.us_east_1a_private_cidr_block

  type              = "private"

  availability_zone = "us-east-1a"

  ngw_id            = module.us_east_1a_public_subnets.ngw_id

  attributes        = ["us-east-1a"]

}

module "us_east_1b_public_subnets" {

  source = "cloudposse/named-subnets/aws"

  # Cloud Posse recommends pinning every module to a specific version

  # version     = "x.x.x"

  namespace         = "eg"

  stage             = "dev"

  name              = "app"

  subnet_names      = ["apples", "oranges", "grapes"]

  vpc_id            = module.vpc.vpc_id

  cidr_block        = local.us_east_1b_public_cidr_block

  type              = "public"

  igw_id            = module.vpc.igw_id

  availability_zone = "us-east-1b"

  attributes        = ["us-east-1b"]

}

module "us_east_1b_private_subnets" {

  source = "cloudposse/named-subnets/aws"

  # Cloud Posse recommends pinning every module to a specific version

  # version     = "x.x.x"

  namespace         = "eg"

  stage             = "dev"

  name              = "app"

  subnet_names      = ["charlie", "echo", "bravo"]

  vpc_id            = module.vpc.vpc_id

  cidr_block        = local.us_east_1b_private_cidr_block

  type              = "private"

  availability_zone = "us-east-1b"

  ngw_id            = module.us_east_1b_public_subnets.ngw_id

  attributes        = ["us-east-1b"]

}

resource "aws_network_interface" "default" {

  subnet_id         = module.us_east_1b_public_subnets.subnet_ids[0]

  source_dest_check = false

  tags              = module.network_interface_label.id

}

module "us_east_1b_private_subnets" {

  source = "cloudposse/named-subnets/aws"

  # Cloud Posse recommends pinning every module to a specific version

  # version     = "x.x.x"

  namespace         = "eg"

  stage             = "dev"

  name              = "app"

  subnet_names      = ["charlie", "echo", "bravo"]

  vpc_id            = module.vpc.vpc_id

  cidr_block        = local.us_east_1b_private_cidr_block

  type              = "private"

  availability_zone = "us-east-1b"

  eni_id            = aws_network_interface.default.id

  attributes        = ["us-east-1b"]

}

```

## Caveat

You must use only one type of device for a default route gateway per route table. `ENI` or `NGW`

Given the following configuration (see the Simple example above)

```hcl

locals {

  public_cidr_block  = cidrsubnet(var.vpc_cidr, 1, 0)

  private_cidr_block = cidrsubnet(var.vpc_cidr, 1, 1)

}

module "public_subnets" {

  source = "cloudposse/named-subnets/aws"

  # Cloud Posse recommends pinning every module to a specific version

  # version     = "x.x.x"

  namespace         = "eg"

  stage             = "dev"

  name              = "app"

  subnet_names      = ["web1", "web2", "web3"]

  vpc_id            = var.vpc_id

  cidr_block        = local.public_cidr_block

  type              = "public"

  availability_zone = "us-east-1a"

  igw_id            = var.igw_id

}

module "private_subnets" {

  source = "cloudposse/named-subnets/aws"

  # Cloud Posse recommends pinning every module to a specific version

  # version     = "x.x.x"

  namespace         = "eg"

  stage             = "dev"

  name              = "database"

  subnet_names      = ["kafka", "cassandra", "zookeeper"]

  vpc_id            = var.vpc_id

  cidr_block        = local.private_cidr_block

  type              = "private"

  availability_zone = "us-east-1a"

  ngw_id            = module.public_subnets.ngw_id

}

output "private_named_subnet_ids" {

  value = module.private_subnets.named_subnet_ids

}

output "public_named_subnet_ids" {

  value = module.public_subnets.named_subnet_ids

}

```

the output Maps of subnet names to subnet IDs look like these

```hcl

public_named_subnet_ids = {

  web1 = subnet-ea58d78e

  web2 = subnet-556ee131

  web3 = subnet-6f54db0b

}

private_named_subnet_ids = {

  cassandra = subnet-376de253

  kafka = subnet-9e53dcfa

  zookeeper = subnet-a86fe0cc

}

```

and the created subnet IDs could be found by the subnet names using `map["key"]` or [`lookup(map, key, [default])`](https://www.terraform.io/docs/configuration/interpolation.html#lookup-map-key-default-),

for example:

`public_named_subnet_ids["web1"]`

`lookup(private_named_subnet_ids, "kafka")`

> [!IMPORTANT]

> In Cloud Posse's examples, we avoid pinning modules to specific versions to prevent discrepancies between the documentation

> and the latest released versions. However, for your own projects, we strongly advise pinning each module to the exact version

> you're using. This practice ensures the stability of your infrastructure. Additionally, we recommend implementing a systematic

> approach for updating versions to avoid unexpected changes.

## Makefile Targets

```text

Available targets:

  help                                Help screen

  help/all                            Display help for all targets

  help/short                          This help short screen

  lint                                Lint terraform code

```

## Requirements

| Name | Version |

|------|---------|

|  [terraform](#requirement\_terraform) | >= 0.13.0 |

|  [aws](#requirement\_aws) | >= 2.0 |

|  [null](#requirement\_null) | >= 2.0 |

## Providers

| Name | Version |

|------|---------|

|  [aws](#provider\_aws) | >= 2.0 |

## Modules

| Name | Source | Version |

|------|--------|---------|

|  [private\_label](#module\_private\_label) | cloudposse/label/null | 0.25.0 |

|  [public\_label](#module\_public\_label) | cloudposse/label/null | 0.25.0 |

|  [this](#module\_this) | cloudposse/label/null | 0.25.0 |

## Resources

| Name | Type |

|------|------|

| [aws_eip.default](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/eip) | resource |

| [aws_nat_gateway.default](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/nat_gateway) | resource |

| [aws_network_acl.private](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/network_acl) | resource |

| [aws_network_acl.public](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/network_acl) | resource |

| [aws_route.private](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/route) | resource |

| [aws_route.public](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/route) | resource |

| [aws_route_table.private](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/route_table) | resource |

| [aws_route_table.public](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/route_table) | resource |

| [aws_route_table_association.private](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/route_table_association) | resource |

| [aws_route_table_association.public](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/route_table_association) | resource |

| [aws_subnet.private](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/subnet) | resource |

| [aws_subnet.public](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/subnet) | resource |

| [aws_vpc.default](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/data-sources/vpc) | data source |

## Inputs

| Name | Description | Type | Default | Required |

|------|-------------|------|---------|:--------:|

|  [additional\_tag\_map](#input\_additional\_tag\_map) | Additional key-value pairs to add to each map in `tags_as_list_of_maps`. Not added to `tags` or `id`.
This is for some rare cases where resources want additional configuration of tags
and therefore take a list of maps with tag key, value, and additional configuration. | `map(string)` | `{}` | no |

|  [attributes](#input\_attributes) | ID element. Additional attributes (e.g. `workers` or `cluster`) to add to `id`,
in the order they appear in the list. New attributes are appended to the
end of the list. The elements of the list are joined by the `delimiter`
and treated as a single ID element. | `list(string)` | `[]` | no |

|  [availability\_zone](#input\_availability\_zone) | Availability Zone | `string` | n/a | yes |

|  [cidr\_block](#input\_cidr\_block) | Base CIDR block which will be divided into subnet CIDR blocks (e.g. `10.0.0.0/16`) | `string` | n/a | yes |

|  [context](#input\_context) | Single object for setting entire context at once.
See description of individual variables for details.
Leave string and numeric variables as `null` to use default value.
Individual variable settings (non-null) override settings in context object,
except for attributes, tags, and additional\_tag\_map, which are merged. | `any` | 
{
  "additional_tag_map": {},
  "attributes": [],
  "delimiter": null,
  "descriptor_formats": {},
  "enabled": true,
  "environment": null,
  "id_length_limit": null,
  "label_key_case": null,
  "label_order": [],
  "label_value_case": null,
  "labels_as_tags": [
    "unset"
  ],
  "name": null,
  "namespace": null,
  "regex_replace_chars": null,
  "stage": null,
  "tags": {},
  "tenant": null
} | no |

|  [delimiter](#input\_delimiter) | Delimiter to be used between ID elements.
Defaults to `-` (hyphen). Set to `""` to use no delimiter at all. | `string` | `null` | no |

|  [descriptor\_formats](#input\_descriptor\_formats) | Describe additional descriptors to be output in the `descriptors` output map.
Map of maps. Keys are names of descriptors. Values are maps of the form
`{
   format = string
   labels = list(string)
}`
(Type is `any` so the map values can later be enhanced to provide additional options.)
`format` is a Terraform format string to be passed to the `format()` function.
`labels` is a list of labels, in order, to pass to `format()` function.
Label values will be normalized before being passed to `format()` so they will be
identical to how they appear in `id`.
Default is `{}` (`descriptors` output will be empty). | `any` | `{}` | no |

|  [enabled](#input\_enabled) | Set to false to prevent the module from creating any resources | `bool` | `null` | no |

|  [eni\_id](#input\_eni\_id) | An ID of a network interface which is used as a default route in private route tables (\_e.g.\_ `eni-9c26a123`).  Conflicts with `ngw_id`. | `string` | `""` | no |

|  [environment](#input\_environment) | ID element. Usually used for region e.g. 'uw2', 'us-west-2', OR role 'prod', 'staging', 'dev', 'UAT' | `string` | `null` | no |

|  [id\_length\_limit](#input\_id\_length\_limit) | Limit `id` to this many characters (minimum 6).
Set to `0` for unlimited length.
Set to `null` for keep the existing setting, which defaults to `0`.
Does not affect `id_full`. | `number` | `null` | no |

|  [igw\_id](#input\_igw\_id) | Internet Gateway ID which will be used as a default route in public route tables (e.g. `igw-9c26a123`). | `string` | `""` | no |

|  [label\_key\_case](#input\_label\_key\_case) | Controls the letter case of the `tags` keys (label names) for tags generated by this module.
Does not affect keys of tags passed in via the `tags` input.
Possible values: `lower`, `title`, `upper`.
Default value: `title`. | `string` | `null` | no |

|  [label\_order](#input\_label\_order) | The order in which the labels (ID elements) appear in the `id`.
Defaults to ["namespace", "environment", "stage", "name", "attributes"].
You can omit any of the 6 labels ("tenant" is the 6th), but at least one must be present. | `list(string)` | `null` | no |

|  [label\_value\_case](#input\_label\_value\_case) | Controls the letter case of ID elements (labels) as included in `id`,
set as tag values, and output by this module individually.
Does not affect values of tags passed in via the `tags` input.
Possible values: `lower`, `title`, `upper` and `none` (no transformation).
Set this to `title` and set `delimiter` to `""` to yield Pascal Case IDs.
Default value: `lower`. | `string` | `null` | no |

|  [labels\_as\_tags](#input\_labels\_as\_tags) | Set of labels (ID elements) to include as tags in the `tags` output.
Default is to include all labels.
Tags with empty values will not be included in the `tags` output.
Set to `[]` to suppress all generated tags.
**Notes:**
  The value of the `name` tag, if included, will be the `id`, not the `name`.
  Unlike other `null-label` inputs, the initial setting of `labels_as_tags` cannot be
  changed in later chained modules. Attempts to change it will be silently ignored. | `set(string)` | [
  "default"
] | no |

|  [map\_public\_ip\_on\_launch\_enabled](#input\_map\_public\_ip\_on\_launch\_enabled) | Enable/disable map\_public\_ip\_on\_launch subnet attribute. | `bool` | `false` | no |

|  [max\_subnets](#input\_max\_subnets) | Maximum number of subnets which can be created. This variable is being used for CIDR blocks calculation. Defaults to length of `subnet_names` argument | `number` | `16` | no |

|  [name](#input\_name) | ID element. Usually the component or solution name, e.g. 'app' or 'jenkins'.
This is the only ID element not also included as a `tag`.
The "name" tag is set to the full `id` string. There is no tag with the value of the `name` input. | `string` | `null` | no |

|  [namespace](#input\_namespace) | ID element. Usually an abbreviation of your organization name, e.g. 'eg' or 'cp', to help ensure generated IDs are globally unique | `string` | `null` | no |

|  [nat\_enabled](#input\_nat\_enabled) | Enable/disable NAT Gateway | `bool` | `true` | no |

|  [ngw\_id](#input\_ngw\_id) | NAT Gateway ID which will be used as a default route in private route tables (e.g. `igw-9c26a123`). Conflicts with `eni_id`. | `string` | `""` | no |

|  [private\_network\_acl\_egress](#input\_private\_network\_acl\_egress) | Private network egress ACL rules | list(object(
    {
      rule_no    = number
      action     = string
      cidr_block = string
      from_port  = number
      to_port    = number
      protocol   = string
  }))
 | [
  {
    "action": "allow",
    "cidr_block": "0.0.0.0/0",
    "from_port": 0,
    "protocol": "-1",
    "rule_no": 100,
    "to_port": 0
  }
] | no |

|  [private\_network\_acl\_id](#input\_private\_network\_acl\_id) | Network ACL ID that will be added to the subnets. If empty, a new ACL will be created | `string` | `""` | no |

|  [private\_network\_acl\_ingress](#input\_private\_network\_acl\_ingress) | Private network ingress ACL rules | list(object(
    {
      rule_no    = number
      action     = string
      cidr_block = string
      from_port  = number
      to_port    = number
      protocol   = string
  }))
 | [
  {
    "action": "allow",
    "cidr_block": "0.0.0.0/0",
    "from_port": 0,
    "protocol": "-1",
    "rule_no": 100,
    "to_port": 0
  }
] | no |

|  [public\_network\_acl\_egress](#input\_public\_network\_acl\_egress) | Public network egress ACL rules | list(object(
    {
      rule_no    = number
      action     = string
      cidr_block = string
      from_port  = number
      to_port    = number
      protocol   = string
  }))
 | [
  {
    "action": "allow",
    "cidr_block": "0.0.0.0/0",
    "from_port": 0,
    "protocol": "-1",
    "rule_no": 100,
    "to_port": 0
  }
] | no |

|  [public\_network\_acl\_id](#input\_public\_network\_acl\_id) | Network ACL ID that will be added to the subnets. If empty, a new ACL will be created | `string` | `""` | no |

|  [public\_network\_acl\_ingress](#input\_public\_network\_acl\_ingress) | Public network ingress ACL rules | list(object(
    {
      rule_no    = number
      action     = string
      cidr_block = string
      from_port  = number
      to_port    = number
      protocol   = string
  }))
 | [
  {
    "action": "allow",
    "cidr_block": "0.0.0.0/0",
    "from_port": 0,
    "protocol": "-1",
    "rule_no": 100,
    "to_port": 0
  }
] | no |

|  [regex\_replace\_chars](#input\_regex\_replace\_chars) | Terraform regular expression (regex) string.
Characters matching the regex will be removed from the ID elements.
If not set, `"/[^a-zA-Z0-9-]/"` is used to remove all characters other than hyphens, letters and digits. | `string` | `null` | no |

|  [stage](#input\_stage) | ID element. Usually used to indicate role, e.g. 'prod', 'staging', 'source', 'build', 'test', 'deploy', 'release' | `string` | `null` | no |

|  [subnet\_names](#input\_subnet\_names) | List of subnet names (e.g. `['apples', 'oranges', 'grapes']`) | `list(string)` | n/a | yes |

|  [tags](#input\_tags) | Additional tags (e.g. `{'BusinessUnit': 'XYZ'}`).
Neither the tag keys nor the tag values will be modified by this module. | `map(string)` | `{}` | no |

|  [tenant](#input\_tenant) | ID element \_(Rarely used, not included by default)\_. A customer identifier, indicating who this instance of a resource is for | `string` | `null` | no |

|  [type](#input\_type) | Type of subnets (`private` or `public`) | `string` | `"private"` | no |

|  [vpc\_id](#input\_vpc\_id) | VPC ID | `string` | n/a | yes |

## Outputs

| Name | Description |

|------|-------------|

|  [named\_subnet\_ids](#output\_named\_subnet\_ids) | Map of subnet names to subnet IDs |

|  [ngw\_id](#output\_ngw\_id) | NAT Gateway ID |

|  [ngw\_private\_ip](#output\_ngw\_private\_ip) | Private IP address of the NAT Gateway |

|  [ngw\_public\_ip](#output\_ngw\_public\_ip) | Public IP address of the NAT Gateway |

|  [route\_table\_ids](#output\_route\_table\_ids) | Route table IDs |

|  [subnet\_ids](#output\_subnet\_ids) | Subnet IDs |

## Related Projects

Check out these related projects.

- [terraform-aws-multi-az-subnets](https://github.com/cloudposse/terraform-aws-multi-az-subnets) - Terraform module for multi-AZ public and private subnets provisioning.

- [terraform-aws-dynamic-subnets](https://github.com/cloudposse/terraform-aws-dynamic-subnets) - Terraform module for public and private subnets provisioning in existing VPC

- [terraform-aws-vpc](https://github.com/cloudposse/terraform-aws-vpc) - Terraform Module that defines a VPC with public/private subnets across multiple AZs with Internet Gateways

- [terraform-aws-cloudwatch-flow-logs](https://github.com/cloudposse/terraform-aws-cloudwatch-flow-logs) - Terraform module for enabling flow logs for vpc and subnets.

> [!TIP]

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## ✨ Contributing

This project is under active development, and we encourage contributions from our community.

Many thanks to our outstanding contributors:



  



For 🐛 bug reports & feature requests, please use the [issue tracker](https://github.com/cloudposse/terraform-aws-named-subnets/issues).

In general, PRs are welcome. We follow the typical "fork-and-pull" Git workflow.

 1. Review our [Code of Conduct](https://github.com/cloudposse/terraform-aws-named-subnets/?tab=coc-ov-file#code-of-conduct) and [Contributor Guidelines](https://github.com/cloudposse/.github/blob/main/CONTRIBUTING.md).

 2. **Fork** the repo on GitHub

 3. **Clone** the project to your own machine

 4. **Commit** changes to your own branch

 5. **Push** your work back up to your fork

 6. Submit a **Pull Request** so that we can review your changes

**NOTE:** Be sure to merge the latest changes from "upstream" before making a pull request!

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## License



Preamble to the Apache License, Version 2.0







Complete license is available in the [`LICENSE`](LICENSE) file.

```text

Licensed to the Apache Software Foundation (ASF) under one

or more contributor license agreements.  See the NOTICE file

distributed with this work for additional information

regarding copyright ownership.  The ASF licenses this file

to you under the Apache License, Version 2.0 (the

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  https://www.apache.org/licenses/LICENSE-2.0

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KIND, either express or implied.  See the License for the

specific language governing permissions and limitations

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```

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---

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