DNS Cache Management - BlueCat Address Manager - 8.3.2

Address Manager Administration Guide

prodname
BlueCat Address Manager
version_custom
8.3.2

Delete DNS information from the DNS recursive or caching server.

When a DNS caching or recursive server obtains a result, the query is temporarily cached according to the record's Time To Live (TTL) value. This is normally a good idea, as it reduces the number of queries that the caching or recursive servers need to make for known hosts. However, when an issue with a particular server or domain is found, these problematic records will persist until the TTL has expired.

Address Manager provides the ability to flush DNS information from the DNS recursive or caching server as needed. It allows you to selectively remove specific cache entries or all entries from the DNS cache to address problems found when troubleshooting DNS. If no DNS deployment role is assigned to a server, Address Manager will display a message; No DNS deployment role assigned to this server.
Note: DNS view name cannot contain spaces

Clearing the DNS cache will fail if the server’s associated DNS View name contains a space. As a best practice, BlueCat recommends to not include any spaces in the names of DNS Views. For more information, refer to article 15043 on BlueCat Customer Care.

To clear the DNS Cache from the server:

  1. From the configuration drop-down menu, select a configuration.
  2. Select the Servers tab. Tabs remember the page you last worked on, so select the tab again to ensure you're on the Configuration information page.
  3. Under Servers, click a server name. The Details tab for the server opens.
  4. Click the Diagnostics tab.
  5. Under DNS, select Clear Cache from the Action drop-down menu.
  6. Click Execute. The Clear DNS Cache page opens.
  7. Under Clear DNS Cache, select a cache entry that you want to clear from the Clear record(s) from drop-down menus.
    • View—select to delete DNS cache entries within a specific DNS View. You can either clear all Views associated with the server or View-specific cache entries in a single View. To clear all cache entries in Views, select View from the first drop-down menu and select All Views from the second drop-down menu. To clear View-specific cache entries in a single View, select View from the first drop-down menu and select a specific view from the second drop-down menu. Only Views with DNS roles assigned to the server will appear in the second drop-down menu.
    • Domain—select to delete domain name cache entries. You can either clear all domain name entries in all Views associated with the server or View-specific domain name entries in a single View. When this option is selected, the Please enter comma-separated names field appears. To clear all domain name cache entries in all Views associated with the server, select Domain from the first drop-down menu and select All Views from the second drop-down menu. Use comma-separated format (CSV) to add multiple domain name entries in the list or add one entry per line to add multiple entries. To clear domain name cache entries from a particular View, select Domain from the first drop-down menu and select a specific view from the second drop-down menu. Only Views with DNS roles assigned to the server will appear in the second drop-down menu.
    • Host—select to delete host name cache entries. You can either clear all host name entries in all Views associated with the server or View-specific host name entries in a single View. When this option is selected, the Please enter comma-separated names field appears. To clear all host name cache entries in all Views, select Host from the first drop-down menu and select All Views from the second drop-down menu. Use CSV format to add multiple host name entries in the list or add one entry per line to add multiple entries. To clear host name cache entries from a particular View, select Host from the first drop-down menu and select a specific view from the second drop-down menu. Only Views with DNS roles assigned to the server will appear in the second drop-down menu.
    • Please enter comma-separated names—this field is populated when Domain or Host is selected from the first drop-down menu. After selecting Domain or Host, enter a list of domain or host names that you want to clear from your DNS server cache. You can enter multiple names in CSV format or one entry per line.
  8. Click Clear.