Updated the READMEs for cross-account discovery

2026-09-16 16:42:17 -05:00
2 changed files with 16 additions and 4 deletions
@@ -25,6 +25,8 @@ Credential rotation can be turned off by setting the
 This plugin will attempt to assume a role when a `role_arn` is supplied through the
 `attributes` object. More information about assume an AWS role can be found [here](https://docs.aws.amazon.com/STS/latest/APIReference/API_AssumeRole.html). This feature only works when the plugin is running on a self managed Boundary [worker](https://developer.hashicorp.com/boundary/tutorials/hcp-administration/hcp-manage-workers).

+To discover hosts across multiple AWS accounts, supply a `target_role_arn` in addition to `role_arn`. The plugin uses the principal credentials to assume the target role via a two-hop `AssumeRole` chain, enabling cross-account host discovery from a single worker. See [Attributes and Secrets](plugin/service/host/README.md#attributes-and-secrets) for the full list of `target_*` attributes.
+
 ### Environment Credentials

 This plugin will attempt to retrieve credentials from environment variables. More
@@ -109,13 +109,23 @@ The following `attributes` are valid on an AWS host catalog resource:
 - `region` (string): The region to configure the host catalog for. All host sets
  in this catalog will be configured for this region.
 - `role_arn` (string): The AWS Role ARN used for `AssumeRole` authentication. If
-  provided, `disable_credential_rotation` must be also set to `true.
- `role_external_id` (string):  The external id configured for the `AssumeRole`
+  provided, `disable_credential_rotation` must be also set to `true`.
+- `role_external_id` (string): The external ID configured for the principal `AssumeRole`
  provider.
- `role_session_name` (string): The session name configured for the `AssumeRole`
+- `role_session_name` (string): The session name configured for the principal `AssumeRole`
  provider.
- `role_tags` (object): The key-value pair tags configured for the `AssumeRole`
+- `role_tags` (object): The key-value pair tags configured for the principal `AssumeRole`
  provider.
+- `target_role_arn` (string): The AWS role ARN of the target IAM role to assume for
+  cross-account discovery. Required if any other `target_*` attributes are configured.
+- `target_region` (string): The region where the target hosts reside. Defaults to the
+  principal account `region` if omitted.
+- `target_role_external_id` (string): The external ID configured for the target
+  `AssumeRole` provider.
+- `target_role_session_name` (string): The session name configured for the target
+  `AssumeRole` provider.
+- `target_role_tags` (object): The key-value pair tags configured for the target
+  `AssumeRole` provider.

 The following `secrets` are required on an AWS host catalog resource: