The ADNR MODIFY procname,REFRESH command
provides a way to dynamically change the ADNR configuration file.
Because the command does not support a file name or dataset specification,
changes must be made to the same configuration file that was used
when ADNR was started.
Restriction: Make all changes to the ADNR configuration
file dynamically while ADNR is running. Changing the configuration
file without using the MODIFY REFRESH command can create orphaned
resource records in a name server. Orphaned resource records are resource
records that are left in a name server and that ADNR has lost the
ability to manage. The presence of these orphaned resource records
might inaccurately direct client connections to sysplex resources
that are not actually available.
Tip: Before making changes to the ADNR configuration file,
save a backup copy of the original file under a different file name
or dataset name.
You can make changes to the ADNR configuration file while ADNR
is stopped, instead of using the MODIFY REFRESH command, if you take
precautions to prevent orphaned resource records or you are sure that
clients will no longer have their resolvers pointing to a name server
with orphaned resource records. Unless you use the MODIFY REFRESH
command to make changes, the following types of changes to the ADNR
configuration file create orphaned resource records in name servers:
- Removing a dns statement
- Removing a zone keyword from a dns statement
- Changing the domain_suffix keyword value on a dns statement
- Changing the IP address or port of a name server on the dns_id
keyword of a dns statement