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Users might choose to convert a Standalone Controller to a Controller Cluster:

• the The Controller Cluster provides high availability,
• Use of the Controller Cluster is subject to the JS7 - License. Both JOC Cockpit and Controller instance instances require a license key being present:

Converting a Standalone Controller to a Controller Cluster offers to revert the Cluster at any later point in time, see JS7 - How to convert revert a Controller Cluster to a Standalone Controller.

Converting the Standalone Controller

Steps for converting a Standalone Controller correspond to the steps performed during JS7 - Initial Operation for Controller Cluster.

Starting the

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Primary Controller Instance

The Standalone Controller automatically becomes the active Primary Controller instance in a cluster. This change of role does not require the Standalone Controller being restarted.

For successful execution of the subsequent steps the Controller instance has to be startedup and running.

Preparing the

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Secondary Controller Instance

Users have to prepare the standby Secondary Controller instance to its role:

• Users should specify the standby role from the Controller instance's controller.conf file:

  Code Block
  title controller.conf file for Standby Secondary Controller Instance
  # Cluster configuration js7.journal.cluster { node { is-backup = yes } }

  For details see JS7 - Controller Configuration Items

• Users should remove an existing journal of the standby Secondary Controller instance. More precisely users should remove the contents of the standby Secondary Controller instance's state folder.

Starting the

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Secondary Controller Instance

In a next step the standby Secondary Controller instance is started like this:

# starting the Standby Controller instance for Unix from the command line
./controller_instance.sh start

# starting the Standby Controller instance for Unix from systemd
sudo systemctl start controller.service

@rem starting the Standby Controller instance for Windows from the command line
.\controller_instance.cmd start

@rem starting the Standby Controller instance Windows Service from the command line
.\controller_instance.cmd start-service

@rem alternatively the Standby Controller instance can be started from the Windows Service Panel

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For details see JS7 - Controller - Command Line Operation.

Operating the Cluster Watch

A Controller Cluster requires the role of a Cluster Watch to be present, see JS7 - Controller Cluster.

This role can be taken either by JOC Cockpit or from an Agent.

Starting JOC Cockpit for Cluster Watch

For Unix JOC Cockpit is started from its Start Script or from JS7 - systemd Service Files for automated Startup and Shutdown with Unix Systems.

For Windows JOC Cockpit is started from its Windows Service.

For details see JS7 - JOC Cockpit - Command Line Operation

JOC Cockpit can be assigned the Cluster Watch starting from this release:

Starting the Cluster Watch Agent

Users choose an existing Standalone Agent or a Primary Director Agent in a JS7 - Agent Cluster to act as a cluster watch Cluster Watch for the Controller Cluster.

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When editing the Controller configuration the following popup window is offered:

The radio buttons Standalone and Cluster radio buttons determine the Controller type.

• Users should modify the Controller type Type to Cluster.
• For the Primary Controller instance users should enter the URL of the current Standalone Controller that is intended to act as the active Controller instance in a cluster.
• For the Secondary Controller instance users should enter the URL of the standby Controller instance.
  

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• The Test Connection buttons can be used to verify if JOC Cockpit can establish a connection to both Controller instances.
• For the Cluster Watch Role either JOC Cockpit or an Agent is specified, see next chapters.

Configuring JOC Cockpit a Cluster Watch

The Cluster Watch role for JOC Cockpit can be configured from a radio button like this:

Image Added

Configuring an Agent as Cluster Watch

The Cluster Watch role can be assigned an Agent from a radio button like this:

Image Added

Operating the Controller Cluster

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• JS7 - Controller Configuration Items
• JS7 - Controller - Command Line Operation
• JS7 - Agent Command Line Operation
• JS7 - How to convert revert a Controller Cluster to a Standalone Controller