# Configuration of services running in a container


<!-- Source: https://github.com/testcontainers/tc-guide-configuration-of-services-running-in-container -->

In this guide, you will learn how to:

- Initialize containers by copying files into them
- Run commands inside running containers using `execInContainer()`
- Set up a PostgreSQL database with SQL scripts
- Create AWS S3 buckets in LocalStack containers

## Prerequisites

- Java 17+
- Your preferred IDE
- A Docker environment supported by Testcontainers

> [!NOTE]
> If you're new to Testcontainers, visit the
> [Testcontainers overview](https://testcontainers.com/getting-started/) to learn more about
> Testcontainers and the benefits of using it.