RNDC Command Syntax Various Option in DNS Configuration /etc/rndc.conf

RNDC command syntax
rndc <option><command><command-option>
and have default configuration . You can use them when the command so required.
If the local host properly configured rndc command can do following things

querylog-turns of logging queries to this name server
refresh- Refresh database
reload- After edit the zone you can type zone name after the reload command it will perform reload particular zone.
stats-sent the current named stats to the /var/named/named.stats file
halt-stop the named service
stop- stop the server

RNDC options are
-c to use configuration file other than the default /etc/rndc.conf
-p-use port number for the rndc other than default 953
-s- to sent the command to server other than default-server
-y- to specify the key other than default key in /etc/rndc.conf

Use rndc Domain Name System Prevent Unauthorized Users

Most use rndc it matching configuration of /etc/named.conf and /etc/rndc.conf the use of secret key name and key value prevent unauthorized users from accessing server. Using the key administrator can access the server and use rndc command to make the changes necessary for management even for remote machine.

DNS rndc utility /etc/named.conf in Red Hat Linux OS

RNDC is the bind utility enables secure and remote management of running name server. It is earlier name is Daemon Control utility (ndc).rndc is also called by remote BIND, or DHCP server to dynamically “update” the local server’s configuration. It is not daemon but utility called by named to verify keys. It used 953 port .rndc is used key specified in /etc/named.conf three statement are essential with option statement you can set the default server and key for rndc
Options
{
default-server localhost;
default-key “”;
};

Server localhost
{
Key “”;
};

Key “”
{
};
and should exactly match their setting /etc/named.conf

To test this command you can run
rndc reload
rndc:relod command successfully.