dns-update
Ruby Dynamic DNS Updater
To install:
gem install dns-update
To use:
Usage: dns-update [options]
-u, --url URL JSON IP URL
-e, --key-name KEY-NAME Name of the TSIG key
-k, --key KEY Base64 encoded TSIG key
-z, --zone ZONE DNS Zone to update
-r, --record RECORD DNS Record to update
-n, --nameserver NAMESERVER Nameserver to update
-t, --ttl TTL TTL of newly updated record
To set up your zone file for dynamic updates, you should generate a key file
with tsig-keygen:
$ tsig-keygen
key "tsig-key" {
algorithm hmac-sha256;
secret "ww4qyRqNH7CVk8U4m0Y0Rjin5G35YJgMv93sjTcRFo4=";
};
Save the output to a safe place, copy and paste it into your named.conf, and
add an update-policy to your zone config:
$ cat named.conf
key "tsig-key" {
algorithm hmac-sha256;
secret "ww4qyRqNH7CVk8U4m0Y0Rjin5G35YJgMv93sjTcRFo4=";
};
zone "insomnike.tk" {
type master;
file "/etc/bind/db.insomnike.tk";
update-policy {
grant tsig-key zonesub ANY;
};
notify yes;
};
...
Now you can call dns-update with your authentication details. It will get
your external IP from jsonip.com and then update your DNS records:
dns-update -e tsig-key -z insomnike.tk \
-n ns.insomnike.tk -r house.insomnike.tk \
-k ww4qyRqNH7CVk8U4m0Y0Rjin5G35YJgMv93sjTcRFo4=