Symptoms
named service does not start and throws the errors like:
zone a.b.provider.com/IN: NS 'ns1.a.provider.com' has no address records (A or AAAA)
Update named tasks may fail with the same output.
The OA managed DNS server has the name of ns1.a.provider.com (fourth-level domain name).
OA also hosts the DNS zone for 'provider.com' domain (second-level domain name).
BIND package version has been updated recently on the DNS server to version >9.7. This happens automatically on OA upgrade from 6.0 to 7.0.
Cause
Starting from version 9.7, BIND has a more strict check for NS records in DNS zones, so if the NS entry points to a subdomain and A record is not defined for it in the zone, the zone validation does not pass. BIND requires glue records to be added for the NS records.
The OSA behavior will be improved in scope of POA-110901.
Resolution
Edit the zone file and add these lines:
a.provider.com. IN NS ns1.a.provider.com.
ns1.a.provider.com. IN A 203.0.113.2