红帽全球峰会2.6. DNS configuration priorities
You can configure many DNS configuration options on the following levels. Each level has a different priority.
- Zone-specific configuration
-
The level of configuration specific for a particular zone defined in IdM has the highest priority. You can manage zone-specific configuration by using the
ipa dnszone-*andipa dnsforwardzone-*commands. - Per-server configuration
-
You are asked to define per-server forwarders during the installation of an IdM server. You can manage per-server forwarders by using the
ipa dnsserver-*commands. If you do not want to set a per-server forwarder when installing a replica, you can use the--no-forwarderoption. - Global DNS configuration
-
If no zone-specific configuration is defined, IdM uses global DNS configuration stored in LDAP. You can manage global DNS configuration using the
ipa dnsconfig-*commands. Settings defined in global DNS configuration are applied to all IdM DNS servers. - Configuration in
/etc/named.conf Configuration defined in the
/etc/named.conffile on each IdM DNS server has the lowest priority. It is specific for each server and must be edited manually.The
/etc/named.conffile is usually only used to specify DNS forwarding to a local DNS cache. Other options are managed using the commands for zone-specific and global DNS configuration mentioned above.
You can configure DNS options on multiple levels at the same time. In such cases, configuration with the highest priority takes precedence over configuration defined at lower levels.
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