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Introduction

The Agent Cluster brings horizontal scalability and fail-over capabilities for Agents. A single Agent can execute thousands of jobs in parallel tasks, however, for a number of use cases it is preferable to distribute server load. This applies particularly to applications that require horizontal scaling across a number of server nodes instead of vertical scaling on a more powerful single server node. Also when a server node in the scheduling environment fails then jobs are executed with the Agents on the remaining server nodes.

• A number of Subagents operated for different servers share the job execution load in an Agent Cluster (active-active clustering).
• Automated fail-over guarantees high-availability and restart capabilities of an Agent Cluster (active-passive cluster).

Prerequisites

The following requirements have to be met before configuring the Agent cluster.

1. The Agent should be installed successfully and running
2. The Agent's ports should be allowed in the firewall

Setup Agent Cluster

1. Login to the JOC Cockpit and move to the Manage Controllers/Agents view from the Administration button.
   
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2. You can view the existing configuration for the Standalone Agent and Cluster Agent:
   
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3. To add the new Agent cluster click on the action menu of Controller and from the drop-down menu click on the Add Agent button.
   
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4. A popup window will appear to create the Agent cluster:
   1. Fill out the mandatory fields, Agent ID for the Agent Cluster.
   2. Add the Primary Director Agent with Subagent ID and its URL.
   3. Select the checkbox "As own cluster".
   4. After adding all the details click on the submit button
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5. After submitting the Agent cluster add the subagent. Click on the action menu of the recently created Agent Cluster and select Add Subagent from the drop-down menu.
   
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6. A popup window will appear. Add the subagent ID and the URL.
   
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7. Follow the same process to add more subagents to the Agent Cluster.
8. I have added two subagents into the Agent Cluster.
   
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9. Once you add all the subagents select the agent cluster and click on the Deploy button.
   
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