Failover is a mechanism through which functions of a failed primary system component can be switched to a secondary system component. The system component may be a processor, server, network, or database.
Use the Failover tab to add blueprints and/or scripts that switch the functions of a failed primary component over to a secondary system component.
View failover process details
To view failover process details:
- From the Deployments page, move the pointer over the deployment you want to view failover processes and click Details.
- Click the Failover tab.
- The Failover process details appear under the following tabs:
- Overview: Click this tab to view graphs for the configured failover rules.
- Policy: Click this tab to view the failover rules and conditions. You can pause or edit the failover process under the Policy tab.
- Log: Click this tab to view timestamps for failover events and updates.
- If the process run is completed, you can view the process run details such as the process name, status, and timestamp.
- Click the process name to view more information on the process deployment details.
Configure or modify failover process
You can configure a failover process under the Manage tab, if the deployed blueprint does not have a failover process configured. You can also use the Failover tab under Manage to modify or edit an existing failover process in the blueprint, based on your requirement.
Note: If you edit a blueprint run instance and add failback rules to it, the newly added failback rules are applied only to the subsequent failover runs. This failback configuration does not impact the failover processes that are already running or triggered.
To configure a failover process:
- From the Deployments page, move the pointer over the deployment you want to configure failover process and click Details.
- Move the pointer below the Failover Tab and click configure. The blueprint opens in edit mode. The Failover and Failback tabs are active to perform configuration.
- Select failover rule conditions (All or Any) from the If box. The default option is Any.
- Click Add Rule to add a failover rule. The Add Rule dialog appears.
- Select the basis for failover from the For box and click Next. The default condition is Avg of All Machines in Blueprint.
- Select a metric, from the Metric For Fail Over box, that will failover this process.
This can either be an app, system or custom metric. For more information on metrics, see the Monitor servers and applications topic.
- Set up conditions to when the failover need to occur.
- Click Finish to save and add the rule to the failover process.
- Drag and drop steps and/or blueprints required for the failover process from the Blueprint Designer.
- Perform configurations (if required) for the added steps and/or blueprints and click Save. The blueprint will be updated with the configured failover process and the process details are displayed.