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docs: add auth token guidance for LocalStack module #11569

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27 changes: 27 additions & 0 deletions docs/modules/localstack.md
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Expand Up @@ -2,6 +2,13 @@

Testcontainers module for [LocalStack](http://localstack.cloud/), 'a fully functional local AWS cloud stack', to develop and test your cloud and serverless apps without actually using the cloud.

!!! warning "Auth Token Required for `localstack/localstack:latest`"
Starting March 23, 2026, `localstack/localstack:latest` requires a
`LOCALSTACK_AUTH_TOKEN` environment variable. To continue without an
auth token, pin to a pre-change version such as `4.14.0`.
See the [LocalStack Auth Token documentation](https://docs.localstack.cloud/getting-started/auth-token/)
for details.

## Usage example

You can start a LocalStack container instance from any Java application by using:
Expand All @@ -10,6 +17,26 @@ You can start a LocalStack container instance from any Java application by using
[Container creation](../../modules/localstack/src/test/java/org/testcontainers/localstack/LocalStackContainerTest.java) inside_block:container
<!--/codeinclude-->

### Using an Auth Token

For LocalStack versions that require authentication, set your auth token:

```java
LocalStackContainer localstack = new LocalStackContainer(
DockerImageName.parse("localstack/localstack:latest")
).withEnv("LOCALSTACK_AUTH_TOKEN", System.getenv("LOCALSTACK_AUTH_TOKEN"));
```

### Pinning to a Pre-Change Version

To continue without an auth token, pin to a pre-change version such as `4.14.0`:

```java
LocalStackContainer localstack = new LocalStackContainer(
DockerImageName.parse("localstack/localstack:4.14.0")
);
```

## Creating a client using AWS SDK

<!--codeinclude-->
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