BIND sends notifications by default, however it is good practice to enable them explicitly if they are an important part of the configuration.
This can be done for individual zones: The setting for a zone takes precedence, therefore if you use the latter method then you should check that it has not been overridden.
The SELinux policy particularly does NOT allow named to modify the $ROOTDIR/var/named directory, the default location for master zone database files.
Slave servers can provide zone updates to other slaves.Suppose that the zone statement contains a list of nameservers from which zone data can be obtained.These need not be masters in the sense defined above: it is possible (and sometimes necessary) for a slave to obtain zone data from another slave. Typical practice is to have one master, and one or two slaves which take their zone data from that master.These instructions describe how to configure the slaves.