bash - Create subdomain on the fly Ubuntu bind -

What I'm trying to do is create a subdomain of an already existing region, but I "update failed: SERVFAIL "Get error.

What do I still have:

  #! / Bin / bash record = yyy.mydomain.com ttl = 5 (echo "server localhost" echo "area mydomain.com" echo "update $ {record} add 300 a217.xxx" resonance "" add ") | / usr / Bin / nsupdate  

Does anyone know what I'm missing