terraform-aws-ecs-cloudwatch-autoscaling

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terraform-aws-ecs-cloudwatch-autoscaling

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Terraform module to autoscale ECS Service based on CloudWatch metrics

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Terraform module for creating alarms for tracking important changes and occurrences from ECS Services.

> [!TIP]
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## Usage

For a complete example, see [examples/complete](examples/complete).

For automated tests of the complete example using `bats` and `Terratest`, see [test](test).

```hcl
module "ecs_cloudwatch_autoscaling" {
  source = "cloudposse/ecs-cloudwatch-autoscaling/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version     = "x.x.x"
  namespace             = "eg"
  stage                 = "staging"
  name                  = "app"
  service_name          = "eg-staging-example-service"
  cluster_name          = "eg-staging-example-cluster"
  min_capacity          = 1
  max_capacity          = 2
  scale_up_adjustment   = 1
  scale_up_cooldown     = 60
  scale_down_adjustment = -1
  scale_down_cooldown   = 300
}
```

> [!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.

## Examples

For a complete usage example, see [terraform-aws-ecs-web-app module](https://github.com/cloudposse/terraform-aws-ecs-web-app/blob/master/main.tf).

## Requirements

| Name | Version |
|------|---------|
| <a name="requirement_terraform"></a> [terraform](#requirement\_terraform) | >= 1 |
| <a name="requirement_aws"></a> [aws](#requirement\_aws) | >= 3.0 |

## Providers

| Name | Version |
|------|---------|
| <a name="provider_aws"></a> [aws](#provider\_aws) | >= 3.0 |

## Modules

| Name | Source | Version |
|------|--------|---------|
| <a name="module_scale_down_label"></a> [scale\_down\_label](#module\_scale\_down\_label) | cloudposse/label/null | 0.25.0 |
| <a name="module_scale_up_label"></a> [scale\_up\_label](#module\_scale\_up\_label) | cloudposse/label/null | 0.25.0 |
| <a name="module_this"></a> [this](#module\_this) | cloudposse/label/null | 0.25.0 |

## Resources

| Name | Type |
|------|------|
| [aws_appautoscaling_policy.down](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/appautoscaling_policy) | resource |
| [aws_appautoscaling_policy.up](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/appautoscaling_policy) | resource |
| [aws_appautoscaling_target.default](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/appautoscaling_target) | resource |

## Inputs

| Name | Description | Type | Default | Required |
|------|-------------|------|---------|:--------:|
| <a name="input_additional_tag_map"></a> [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 |
| <a name="input_attributes"></a> [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 |
| <a name="input_cluster_name"></a> [cluster\_name](#input\_cluster\_name) | The name of the ECS cluster where service is to be autoscaled | `string` | n/a | yes |
| <a name="input_context"></a> [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` | <pre>{ "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 }</pre> | no |
| <a name="input_delimiter"></a> [delimiter](#input\_delimiter) | Delimiter to be used between ID elements. Defaults to `-` (hyphen). Set to `""` to use no delimiter at all. | `string` | `null` | no |
| <a name="input_descriptor_formats"></a> [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 |
| <a name="input_enabled"></a> [enabled](#input\_enabled) | Set to false to prevent the module from creating any resources | `bool` | `null` | no |
| <a name="input_environment"></a> [environment](#input\_environment) | ID element. Usually used for region e.g. 'uw2', 'us-west-2', OR role 'prod', 'staging', 'dev', 'UAT' | `string` | `null` | no |
| <a name="input_id_length_limit"></a> [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 |
| <a name="input_label_key_case"></a> [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 |
| <a name="input_label_order"></a> [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 |
| <a name="input_label_value_case"></a> [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 |
| <a name="input_labels_as_tags"></a> [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)` | <pre>[ "default" ]</pre> | no |
| <a name="input_max_capacity"></a> [max\_capacity](#input\_max\_capacity) | Maximum number of running instances of a Service | `number` | `2` | no |
| <a name="input_min_capacity"></a> [min\_capacity](#input\_min\_capacity) | Minimum number of running instances of a Service | `number` | `1` | no |
| <a name="input_name"></a> [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 |
| <a name="input_namespace"></a> [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 |
| <a name="input_regex_replace_chars"></a> [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 |
| <a name="input_scale_down_cooldown"></a> [scale\_down\_cooldown](#input\_scale\_down\_cooldown) | Period (in seconds) to wait between scale down events | `number` | `300` | no |
| <a name="input_scale_down_step_adjustments"></a> [scale\_down\_step\_adjustments](#input\_scale\_down\_step\_adjustments) | List of step adjustments for scale down policy | <pre>list(object({ metric_interval_lower_bound = optional(number) metric_interval_upper_bound = optional(number) scaling_adjustment = number }))</pre> | <pre>[ { "metric_interval_lower_bound": null, "metric_interval_upper_bound": 0, "scaling_adjustment": -1 } ]</pre> | no |
| <a name="input_scale_up_cooldown"></a> [scale\_up\_cooldown](#input\_scale\_up\_cooldown) | Period (in seconds) to wait between scale up events | `number` | `60` | no |
| <a name="input_scale_up_step_adjustments"></a> [scale\_up\_step\_adjustments](#input\_scale\_up\_step\_adjustments) | List of step adjustments for scale up policy | <pre>list(object({ metric_interval_lower_bound = optional(number) metric_interval_upper_bound = optional(number) scaling_adjustment = number }))</pre> | <pre>[ { "metric_interval_lower_bound": 0, "metric_interval_upper_bound": null, "scaling_adjustment": 1 } ]</pre> | no |
| <a name="input_service_name"></a> [service\_name](#input\_service\_name) | The name of the ECS Service to autoscale | `string` | n/a | yes |
| <a name="input_stage"></a> [stage](#input\_stage) | ID element. Usually used to indicate role, e.g. 'prod', 'staging', 'source', 'build', 'test', 'deploy', 'release' | `string` | `null` | no |
| <a name="input_tags"></a> [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 |
| <a name="input_tenant"></a> [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 |

## Outputs

| Name | Description |
|------|-------------|
| <a name="output_scale_down_policy_arn"></a> [scale\_down\_policy\_arn](#output\_scale\_down\_policy\_arn) | ARN of the scale down policy |
| <a name="output_scale_up_policy_arn"></a> [scale\_up\_policy\_arn](#output\_scale\_up\_policy\_arn) | ARN of the scale up policy |

## Related Projects

Check out these related projects.

- [terraform-aws-ecs-web-app](https://github.com/cloudposse/terraform-aws-ecs-web-app) - Terraform module that implements a web app on ECS and supporting AWS resources
- [terraform-aws-alb](https://github.com/cloudposse/terraform-aws-alb) - Terraform module to provision a standard ALB for HTTP/HTTP traffic
- [terraform-aws-alb-ingress](https://github.com/cloudposse/terraform-aws-alb-ingress) - Terraform module to provision an HTTP style ingress rule based on hostname and path for an ALB
- [terraform-aws-codebuild](https://github.com/cloudposse/terraform-aws-codebuild) - Terraform Module to easily leverage AWS CodeBuild for Continuous Integration
- [terraform-aws-ecr](https://github.com/cloudposse/terraform-aws-ecr) - Terraform Module to manage Docker Container Registries on AWS ECR
- [terraform-aws-ecs-alb-service-task](https://github.com/cloudposse/terraform-aws-ecs-alb-service-task) - Terraform module which implements an ECS service which exposes a web service via ALB.
- [terraform-aws-ecs-codepipeline](https://github.com/cloudposse/terraform-aws-ecs-codepipeline) - Terraform Module for CI/CD with AWS Code Pipeline and Code Build for ECS
- [terraform-aws-ecs-container-definition](https://github.com/cloudposse/terraform-aws-ecs-container-definition) - Terraform module to generate well-formed JSON documents that are passed to the aws_ecs_task_definition Terraform resource

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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-ecs-cloudwatch-autoscaling/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-ecs-cloudwatch-autoscaling/?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

<details>
<summary>Preamble to the Apache License, Version 2.0</summary>

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
"License"); you may not use this file except in compliance
with the License.  You may obtain a copy of the License at

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

Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied. See the License for the
specific language governing permissions and limitations
under the License.
```
</details>

## Trademarks

All other trademarks referenced herein are the property of their respective owners.

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