A clustered Orchestrator is a set of nodes that appear and act as a single Orchestrator and use a shared library. You can cluster any CA Process Automation Orchestrator for high availability, fault tolerance, and scalability.
A load balancer, such as the NGINX HTTP Server, is required for clustering any Orchestrator, including the Domain Orchestrator. A load balancer is not part of the CA Process Automation installation. You must install and configure a load balancer before you install CA Process Automation.
The simplified communication mode, introduced in CA Process Automation 4.2, uses web sockets and HTTP to produce a one way, persisted connection from the agent to the Orchestrator. CA Technologies supports NGINX for this new simplified communication method, but you can use any load balancer that supports web sockets to use it.
Note: The Apache load balancer does not support the simplified communication mode for agents, so use NGINX or another web socket-based load balancer to take advantage of this feature. If you are not using the simplified communication method and want to use the deprecated communication method, you can install the Apache load balancer.
Install the NGINX load balancer on a host external to CA Process Automation to ensure operating system compatibility. See the NGINX documentation for supported operating systems.
A load balancer is only required for an Orchestrator in a clustered configuration and in specific Single Sign On (SSO) configurations.
Important! If you want to cluster an existing stand-alone Orchestrator, install and configure a load balancer, and then reinstall the Orchestrator.
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