We explain the process to install an Automation Hybrid Worker in this article published at Techgenix.
Azure Automation is a cloud solution that helps organizations meet their infrastructure and security requirements by automating tasks, providing desired state configuration for your servers, and configuration management. By default, when Azure Automation is created it will allow execution of scripts in Azure. But some organizations want to be able to automate tasks in other clouds and on-premises environments, and the Hybrid Worker tool is the key to deliver such solution.
Read more at source: http://techgenix.com/configuring-hybrid-worker/