Chapter 3. Caching and queueing system

Redis is an open source, in-memory, NoSQL key/value store used primarily as an application cache and lightweight message broker, which stores event queues, session data, and tokens to deliver improved performance, reliability, and data security.

platform gateway and Event-Driven Ansible use Centralized Redis. Automation controller and automation hub have their own instances of Redis.

This cache and queue system stores data in memory, rather than on a disk or solid-state drive (SSD), which helps deliver speed, reliability, and performance. Secure communication with the cache and queue system through Transport Layer Security (TLS) encryption and authentication protects your data.

Redis provides fast, in-memory caching and session management for Ansible Automation Platform components, improving performance and enabling scaling.

Ansible Automation Platform offers a centralized Redis instance in both standalone and clustered topologies.

With clustered Redis, data is automatically partitioned over multiple nodes to provide performance stability and nodes are assigned as replicas to provide reliability. Clustered Redis, shared between the platform gateway and Event-Driven Ansible, is provided by default when installing Ansible Automation Platform in containerized and operator-based deployments.

A cluster has three primary nodes and each primary node has a replica node.

If a primary instance becomes unavailable due to failures, the other primary nodes will initiate a failover state to promote a replica node to a primary node.

The benefits of deploying clustered Redis over standalone Redis include the following:

For more information about scalability with Redis, see Scale with Redis Cluster in the Redis product documentation.

For more information about deploying Ansible Automation Platform with clustered Redis, see the RPM installation, Containerized installation, and Installing on OpenShift Container Platform guides.

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Standalone Redis offers a straightforward deployment option for Ansible Automation Platform environments where high availability is not critical.

Standalone Redis consists of a simple architecture that is easy to deploy and configure.