Manage Hostname Changes

When the hostname of a monitored device changes, capm detects the change and updates the hostname for the device item. If the device item name uses the hostname, capm updates the device name. The default detection rate for hostname changes is 24 hours. However, the change might not appear in the system for up to twice the detection period. For example, with the default reevaluation rate of 24 hours, changes to the hostname are updated within 48 hours.
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When the hostname of a monitored device changes, 
CA Performance Management
 detects the change and updates the hostname for the device item. If the device item name uses the hostname, 
CA Performance Management
 updates the device name. The default detection rate for hostname changes is 24 hours. However, the change might not appear in the system for up to twice the detection period. For example, with the default reevaluation rate of 24 hours, changes to the hostname are updated within 48 hours.
 
CA Performance Management
 only looks for hostname changes on devices with defined hostnames. If the device did not have a DNS hostname when discovery created the device item, 
CA Performance Management
 does not detect changes. To add the hostname to the device item, run the discovery profile again. For more information, see Run Discovery.
Modify the Hostname Change Detection Rate
The default hostname change detection rate is 24 hours. To reduce DNS traffic or to detect changes faster, modify the reevaluation interval. Each Data Collector has a separate evaluation interval. To change the interval for a specific device or group of devices, apply the changes to each Data Collector individually.
 
Follow these steps:
 
  1. Log in to the Data Collector host that monitors the device.
  2. Locate the Data Collector configuration file:
    APACHE_KARAF/etc/com.ca.im.dm.core.collector.cfg
  3. Add or modify the following line:
    hostname-reevaluation-interval-in-hours=
    number
     
    number
     specifies the length in hours of the reevaluation interval.
  4. Save the file.
    The Data Collector uses the new interval for hostname reevaluation. Changes to the hostname take up to twice the interval to appear in the system.