In highly dynamic (virtual/cloud-based services) environments, new nodes are generated and decommissioned repeatedly and often. Discovery processes are usually too slow to detect them and create the required related CI. To ensure that it is possible to manage events received from dynamically generated nodes, OMi creates these node CIs automatically as they are required, and the new CI is attached to the event before further processing. If the IP address and OM agent ID are available, they are also associated with the event.
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Dynamic node generation
If the associated node for an incoming event cannot be resolved, it is assumed that it does not yet exist in the RTSM, and OMi checks if the event is allowed to trigger a node generation. This check is configured by providing a whitelist of IP ranges, node name patterns, or both. These patterns use the IP address or the node name to identify whether the node CI associated with an event is allowed to be created dynamically. If the event matches a filter from the whitelists, a node CI is created.
New nodes are created as incomplete CIs of type node (the base class for router and computer CIs). The following attributes are completed using these fields:
nodename: — name, primary_dns_name
Creating a new node CI in the RTSM may be delayed or fail if the RTSM is busy. If the node is created within the allowed time period, the event is updated and released. If there is an error or a time out, the event is released and initially stored without a node reference. The CI Resolver retries after a predefined time period.
Decommissioning of dynamically-created nodes
Automatically created nodes are decommission when it is established that they are no longer needed. The existence of dynamically created node CIs is extended whenever an associated event is received. If no new event is received for an automatically created node for a period of 40 days, the node is assumed not to exist anymore and its node CI is removed from the RTSM.
Tasks
How to automatically create nodes from events in dynamic environments
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Navigate to the OMi Infrastructure Settings manager:
Administration > Setup and Maintenance > Infrastructure Settings
Alternatively, click Infrastructure Settings.
From the Applications drop-down list, select Operations Management and scroll to Operations Management - Automatic Node Generation for Dynamic Environments Settings.
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Set Dynamic Node Generation to true. CIs for new systems are automatically generated in the RTSM.
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Optional. Edit the IP Ranges setting and specify the IP addresses that relate to the dynamic environment.
Format:
<ip_start>-<ip_end>,<ip-start>-<ip-end> -
Optional. Edit the Node Name Patterns setting and specify the nodes that relate to the dynamic environment. You can use regular expressions to specify the pattern.
Format:
<pattern1>,<pattern2> -
Optional. Configure the Resolution Retry Time setting in the CI Resolver Settings pane to control how often retries are made by the CI Resolver to resolve failed resolution attempts. After a node is automatically generated, failed resolution attempts requiring such a node will succeed on the next retry.