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Cluster Overview

Cluster Overview

Available in PagerDuty Process Automation Commercial products.

Process Automation Architecture

Process Automation architecture
Process Automation architecture


To install a new Process Automation instance, download the latest version from hereopen in new window, and review requirements and deployment steps in the Deployment Guide.


The Process Automation environment needs the following shared resources:


  • All the cluster instances must share the same DB:

    See: Database Backends.

  • The keys and project data must be stored in the DB (enabled by default since 2.4.x):

    See: Storage Facility

Load Balancer

A load balancer allows you to achieve high availability in your Process Automation installation by routing http traffic across several redundant Process Automation instances.

  • Set the grails.serverURL parameter of all cluster members ( with the LB URL.

  • Use Sticky session

See: Loadbalancer

Log Storage

All Cluster instances must share the same storage location for execution logs.

See: Logstore

Note: If you use the S3 Log Storage Plugin Be sure to use in place of It adds the additional feature:

  • Checkpoint log storage: This enables viewing the execution logs while the execution is running.


The cluster environment needs a common authentication method. All the instances must have access to the same list of users/groups

See: Authenticating Users

Resource Model

Projects need a common resource model that can be accessed from all cluster members. These are some of the alternatives to achieve this:

  • A shared file system
  • A script
  • A REST endpoint

See: Node Model Sources



Scheduled jobs are owned by the last cluster member who modified them. Jobs can also be controlled using Cluster Manager. If a cluster member goes down, all scheduled jobs on that cluster member must be moved to another cluster node. This process can be performed automatically using the heartbeat and Autotakeover features in Process Automation version 2.1.0 and later releases.

See: Autotakeover

Cluster Remote Execution Policy

This feature allows Process Automation cluster members to forward job executions to other cluster members based on a policy configuration.

See: Remote Job Execution

Process Automation Replication

This plugin is used for an active/passive configuration. Each cluster member can have its own database.

See Process Automation Replication