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terraform-aws-cloudwatch-logs

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Terraform Module to Provide a CloudWatch Logs Endpoint

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Terraform module for creation of CloudWatch Log Streams and Log Groups. Useful in combination with Fluentd/Fluent-bit for shipping logs.

> [!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).
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## Usage

```terraform
module "cloudwatch_logs" {
  source  = "cloudposse/cloudwatch-logs/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version = "x.x.x"

namespace    = "eg"
  stage        = "prod"
  name         = "app"
  stream_names = ["kafka-instance-1", "kafka-instance-2"]
}
```

> [!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

Here's a complete [example](examples/complete/main.tf) of using this `terraform-aws-cloudwatch-logs` module.

## Requirements

| Name | Version |
|------|---------|
| <a name="requirement_terraform"></a> [terraform](#requirement\_terraform) | >= 0.13.0 |
| <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_log_group_label"></a> [log\_group\_label](#module\_log\_group\_label) | cloudposse/label/null | 0.25.0 |
| <a name="module_role"></a> [role](#module\_role) | cloudposse/iam-role/aws | 0.19.0 |
| <a name="module_this"></a> [this](#module\_this) | cloudposse/label/null | 0.25.0 |

## Resources

| Name | Type |
|------|------|
| [aws_cloudwatch_log_group.default](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/cloudwatch_log_group) | resource |
| [aws_cloudwatch_log_stream.default](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/cloudwatch_log_stream) | resource |
| [aws_iam_policy_document.log_agent](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/data-sources/iam_policy_document) | data source |

## Inputs

| Name | Description | Type | Default | Required |
|------|-------------|------|---------|:--------:|
| <a name="input_additional_permissions"></a> [additional\_permissions](#input\_additional\_permissions) | Additional permissions granted to the IAM role | `list(string)` | <pre>[ "logs:CreateLogStream", "logs:DeleteLogStream" ]</pre> | no |
| <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_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_iam_role_enabled"></a> [iam\_role\_enabled](#input\_iam\_role\_enabled) | Whether to create an IAM role which is able to write logs to the CloudWatch Logs log group | `bool` | `true` | no |
| <a name="input_iam_tags_enabled"></a> [iam\_tags\_enabled](#input\_iam\_tags\_enabled) | Enable/disable tags on IAM roles and policies | `string` | `true` | 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_kms_key_arn"></a> [kms\_key\_arn](#input\_kms\_key\_arn) | The ARN of the KMS Key to use when encrypting log data. Please note, after the AWS KMS CMK is disassociated from the log group, AWS CloudWatch Logs stops encrypting newly ingested data for the log group. All previously ingested data remains encrypted, and AWS CloudWatch Logs requires permissions for the CMK whenever the encrypted data is requested. | `string` | `""` | 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_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_permissions_boundary"></a> [permissions\_boundary](#input\_permissions\_boundary) | ARN of the policy that is used to set the permissions boundary for the IAM role | `string` | `""` | no |
| <a name="input_principals"></a> [principals](#input\_principals) | Map of service name as key and a list of ARNs to allow assuming the role as value. (e.g. map(`AWS`, list(`arn:aws:iam:::role/admin`))) | `map(any)` | <pre>{ "Service": [ "ec2.amazonaws.com" ] }</pre> | 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_retention_in_days"></a> [retention\_in\_days](#input\_retention\_in\_days) | Number of days you want to retain log events in the log group | `string` | `"30"` | no |
| <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_stream_names"></a> [stream\_names](#input\_stream\_names) | Names of streams | `list(string)` | `[]` | 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_log_group_arn"></a> [log\_group\_arn](#output\_log\_group\_arn) | ARN of the log group |
| <a name="output_log_group_name"></a> [log\_group\_name](#output\_log\_group\_name) | Name of log group |
| <a name="output_role_arn"></a> [role\_arn](#output\_role\_arn) | ARN of the IAM role |
| <a name="output_role_name"></a> [role\_name](#output\_role\_name) | Name of the IAM role |
| <a name="output_stream_arns"></a> [stream\_arns](#output\_stream\_arns) | ARNs of the log streams |

## Related Projects

Check out these related projects.

- [terraform-aws-cloudwatch-flow-logs](https://github.com/cloudposse/terraform-aws-cloudwatch-flow-logs) - Terraform module for enabling flow logs for vpc and subnets.
- [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-cloudtrail-cloudwatch-alarms](https://github.com/cloudposse/terraform-aws-cloudtrail-cloudwatch-alarms) - Terraform module for creating alarms for tracking important changes and occurances from cloudtrail.
- [prometheus-to-cloudwatch](https://github.com/cloudposse/prometheus-to-cloudwatch) - Utility for scraping Prometheus metrics from a Prometheus client endpoint and publishing them to CloudWatch
- [terraform-aws-cloudwatch-logs](https://github.com/cloudposse/terraform-aws-cloudwatch-logs) - Terraform Module to Provide a CloudWatch Logs Endpoint
- [terraform-aws-efs-cloudwatch-sns-alarms](https://github.com/cloudposse/terraform-aws-efs-cloudwatch-sns-alarms) - Terraform module that configures CloudWatch SNS alerts for EFS
- [terraform-aws-ecs-cloudwatch-autoscaling](https://github.com/cloudposse/terraform-aws-ecs-cloudwatch-autoscaling) - Terraform module to autoscale ECS Service based on CloudWatch metrics
- [terraform-aws-ecs-cloudwatch-sns-alarms](https://github.com/cloudposse/terraform-aws-ecs-cloudwatch-sns-alarms) - Terraform module to create CloudWatch Alarms on ECS Service level metrics.
- [terraform-aws-sqs-cloudwatch-sns-alarms](https://github.com/cloudposse/terraform-aws-sqs-cloudwatch-sns-alarms) - Terraform module for creating alarms for SQS and notifying endpoints
- [terraform-aws-elasticache-cloudwatch-sns-alarms](https://github.com/cloudposse/terraform-aws-elasticache-cloudwatch-sns-alarms) - Terraform module that configures CloudWatch SNS alerts for ElastiCache
- [terraform-aws-ec2-cloudwatch-sns-alarms](https://github.com/cloudposse/terraform-aws-ec2-cloudwatch-sns-alarms) - Terraform module that configures CloudWatch SNS alerts for EC2 instances
- [terraform-aws-rds-cloudwatch-sns-alarms](https://github.com/cloudposse/terraform-aws-rds-cloudwatch-sns-alarms) - Terraform module that configures important RDS alerts using CloudWatch and sends them to an SNS topic
- [terraform-aws-lambda-cloudwatch-sns-alarms](https://github.com/cloudposse/terraform-aws-lambda-cloudwatch-sns-alarms) - Terraform module for creating a set of Lambda alarms and outputting to an endpoint
- [terraform-aws-alb-target-group-cloudwatch-sns-alarms](https://github.com/cloudposse/terraform-aws-alb-target-group-cloudwatch-sns-alarms) - Terraform module to create CloudWatch Alarms on ALB Target level metrics.
- [terraform-aws-sns-lambda-notify-slack](https://github.com/cloudposse/terraform-aws-sns-lambda-notify-slack) - Terraform module to provision a lambda function that subscribes to SNS and notifies to Slack.

> [!TIP]
> #### Use Terraform Reference Architectures for AWS
>
> Use Cloud Posse's ready-to-go [terraform architecture blueprints](https://cloudposse.com/reference-architecture/) for AWS to get up and running quickly.
>
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> ✅ Your team owns everything. 
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</details>

## ✨ 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-cloudwatch-logs/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-cloudwatch-logs/?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!

## Running Terraform Tests

We use [Atmos](https://atmos.tools) to streamline how Terraform tests are run. It centralizes configuration and wraps common test workflows with easy-to-use commands.

All tests are located in the [`test/`](test) folder.

Under the hood, tests are powered by Terratest together with our internal [Test Helpers](https://github.com/cloudposse/test-helpers) library, providing robust infrastructure validation.

Setup dependencies:
- Install Atmos ([installation guide](https://atmos.tools/install/))
- Install Go [1.24+ or newer](https://go.dev/doc/install)
- Install Terraform or OpenTofu

To run tests:

- Run all tests:  
  ```sh
  atmos test run
  ```
- Clean up test artifacts:  
  ```sh
  atmos test clean
  ```
- Explore additional test options:  
  ```sh
  atmos test --help
  ```
The configuration for test commands is centrally managed. To review what's being imported, see the [`atmos.yaml`](https://raw.githubusercontent.com/cloudposse/.github/refs/heads/main/.github/atmos/terraform-module.yaml) file.

Learn more about our [automated testing in our documentation](https://docs.cloudposse.com/community/contribute/automated-testing/) or implementing [custom commands](https://atmos.tools/core-concepts/custom-commands/) with atmos.

### 🌎 Slack Community

Join our [Open Source Community](https://cpco.io/slack?utm_source=github&utm_medium=readme&utm_campaign=cloudposse/terraform-aws-cloudwatch-logs&utm_content=slack) on Slack. It's **FREE** for everyone! Our "SweetOps" community is where you get to talk with others who share a similar vision for how to rollout and manage infrastructure. This is the best place to talk shop, ask questions, solicit feedback, and work together as a community to build totally *sweet* infrastructure.

### 📰 Newsletter

Sign up for [our newsletter](https://cpco.io/newsletter?utm_source=github&utm_medium=readme&utm_campaign=cloudposse/terraform-aws-cloudwatch-logs&utm_content=newsletter) and join 3,000+ DevOps engineers, CTOs, and founders who get insider access to the latest DevOps trends, so you can always stay in the know.
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### 📆 Office Hours <a href="https://cloudposse.com/office-hours?utm_source=github&utm_medium=readme&utm_campaign=cloudposse/terraform-aws-cloudwatch-logs&utm_content=office_hours"><img src="https://img.cloudposse.com/fit-in/200x200/https://cloudposse.com/wp-content/uploads/2019/08/Powered-by-Zoom.png" align="right" /></a>

[Join us every Wednesday via Zoom](https://cloudposse.com/office-hours?utm_source=github&utm_medium=readme&utm_campaign=cloudposse/terraform-aws-cloudwatch-logs&utm_content=office_hours) for your weekly dose of insider DevOps trends, AWS news and Terraform insights, all sourced from our SweetOps community, plus a _live Q&A_ that you can’t find anywhere else.
It's **FREE** for everyone!
## 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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