Critical I'm very satisfied with my setup, but I'm quite frequently getting the
following error in my system's log:
ods-signer: [socket] unable to handle outgoing tcp response: write()
failed (Broken pipe)
I couldn't find any information on this problem, so I've tried looking
into it. Here is what I think is happening:
1. nsd is periodically checking if its zone is up to date by issuing an
AXFR query to the ods-signerd
2. The ods-signerd starts delivering the zone
3. nsd realizes that the SOA has not changed and its zone is already up
to date. It (half) closes the TCP connection as per RFC 5936, Section
4.1.1
4. osd-signerd keeps sending more information on the zone (which to my
understanding it shouldn't). As a result nsd sends a TCP RST.
ods-signerd does not handle this gracefully, thus the socket error
message.
So as far as I can tell, it's safe for me to ignore the error.