Centos – how can I add records to the zone file without restarting the named service

bindcentosdns

I'm working on centos6.5 and bind9 and I have managed to add records to a DNS zone by doing this steps:

creating the key: 

 dnssec-keygen -a HMAC-MD5 -b 128 -n HOST example.com.

editing conf. file:

// TSIG Key
key "example.com." {
     algorithm hmac-md5;
     secret "THE KEY GENERATED ABOVE";
};
zone "example.com" IN {
     type master;
     file "example.com.zone";
     allow-update{ key "example.com."; };
};

give the named authorization to the /var/named folder:

# chown -R named:named /var/named
# find . -type d -exec chmod 770 {} \;
# find . -type f -exec chmod 660 {} \;

I have adding records using this script:

#!/bin/bash
#Defining Variables
DNS_SERVER="localhost"
DNS_ZONE="example.com."
USER_NAME="dd2.example.com."
IP="192.168.1.7"
TTL="60"
RECORD=" $USER_NAME $TTL A $IP"
echo "
server $DNS_SERVER
zone $DNS_ZONE
debug
update add $RECORD
show
send" | nsupdate -k Kexample.com.+157+55566.key

it didn't return any error.

I test if I add this record by using dig command:

#dig +short dd2.example.com.
192.168.1.7

but the problem that the record added doesn't appear in the zone file 'example.com.zone'.

even when I use reload: rndc reload MYZONE or rndc reload
it returns an error message like this:

[root@dd Shells]# rndc reload example.com.
rndc: 'reload' failed: dynamic zone

but when I restart the named service: service named restart
the record appears in the zone file.

my question is :

Is it a way to the record to be added to the zone file without restarting the named service?

Best Answer

I have found the answer:

my problem was that BIND can't rndc reload zone with the dynamic zones so BIND won’t allow us to reload a dynamic zone. So we have to tell bind to temporarily stop allowing dynamic updates. This is handled with the freeze option.

rndc freeze example.com

then reloading 

rndc reload example.com

then allowing dynamic updates again:

rndc thaw example.com
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