DNSaas_Dynect_Backend: Designate MDNS fails to send SOA messages to dynect with error " dns.exception.SyntaxError"
I have provided following nameservers in pools.yaml .
All these namservers are directly reachable from HOS controllers
s ping ns1.p13.dynect.net
PING ns1.p13.dynect.net (208.78.70.13) 56(84) bytes of data.
64 bytes from ns1.p13.dynect.net (208.78.70.13): icmp_seq=1 ttl=54 time=9.10 ms
64 bytes from ns1.p13.dynect.net (208.78.70.13): icmp_seq=2 ttl=54 time=9.07 ms
nameservers:
host: ns1.p13.dynect.net
port: 53
host: ns2.p13.dynect.net
port: 53
host: ns3.p13.dynect.net
port: 53
host: ns4.p13.dynect.net
port: 53
When user creates zones , MDNS tries to send SOA to these nameservers , but it fails with below error
2016-09-14 13:38:59.444 30452 INFO designate.mdns.notify [req-70535ff1-1747-4a0e-9bcf-bb87d329ed4a - - - - -] Sending 'SOA' for 'newd.com.' to 'ns1.p13.dynect.net:53'.
2016-09-14 13:38:59.455 30452 INFO dns.query [req-70535ff1-1747-4a0e-9bcf-bb87d329ed4a - - - - -] ALOK
2016-09-14 13:38:59.456 30452 INFO dns.query [req-70535ff1-1747-4a0e-9bcf-bb87d329ed4a - - - - -] ('208.78.70.13', 53)
2016-09-14 13:38:59.456 30452 INFO dns.query [req-70535ff1-1747-4a0e-9bcf-bb87d329ed4a - - - - -] (u'ns1.p13.dynect.net', 53)
2016-09-14 13:38:59.457 30452 ERROR oslo_messaging.rpc.dispatcher [req-70535ff1-1747-4a0e-9bcf-bb87d329ed4a - - - - -] Exception during message handling:
2016-09-14 13:38:59.457 30452 ERROR oslo_messaging.rpc.dispatcher Traceback (most recent call last):
2016-09-14 13:38:59.457 30452 ERROR oslo_messaging.rpc.dispatcher File "/opt/stack/venv/designate-20160905T180556Z/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 138, in _dispatch_and_reply
2016-09-14 13:38:59.457 30452 ERROR oslo_messaging.rpc.dispatcher incoming.message))
2016-09-14 13:38:59.457 30452 ERROR oslo_messaging.rpc.dispatcher File "/opt/stack/venv/designate-20160905T180556Z/lib/python2.7/site-packages/designate/rpc.py", line 182, in _dispatch
2016-09-14 13:38:59.457 30452 ERROR oslo_messaging.rpc.dispatcher return super(RPCDispatcher, self)._dispatch(*args, **kwds)
2016-09-14 13:38:59.457 30452 ERROR oslo_messaging.rpc.dispatcher File "/opt/stack/venv/designate-20160905T180556Z/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 185, in _dispatch
2016-09-14 13:38:59.457 30452 ERROR oslo_messaging.rpc.dispatcher return self._do_dispatch(endpoint, method, ctxt, args)
2016-09-14 13:38:59.457 30452 ERROR oslo_messaging.rpc.dispatcher File "/opt/stack/venv/designate-20160905T180556Z/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 127, in _do_dispatch
2016-09-14 13:38:59.457 30452 ERROR oslo_messaging.rpc.dispatcher result = func(ctxt, **new_args)
2016-09-14 13:38:59.457 30452 ERROR oslo_messaging.rpc.dispatcher File "/opt/stack/venv/designate-20160905T180556Z/lib/python2.7/site-packages/designate/mdns/notify.py", line 89, in poll_for_serial_number
2016-09-14 13:38:59.457 30452 ERROR oslo_messaging.rpc.dispatcher retry_interval, max_retries, delay)
2016-09-14 13:38:59.457 30452 ERROR oslo_messaging.rpc.dispatcher File "/opt/stack/venv/designate-20160905T180556Z/lib/python2.7/site-packages/designate/mdns/notify.py", line 122, in get_serial_number
2016-09-14 13:38:59.457 30452 ERROR oslo_messaging.rpc.dispatcher zone, host, port, timeout, retry_interval, retries_left)
2016-09-14 13:38:59.457 30452 ERROR oslo_messaging.rpc.dispatcher File "/opt/stack/venv/designate-20160905T180556Z/lib/python2.7/site-packages/designate/mdns/notify.py", line 200, in _make_and_send_dns_message
2016-09-14 13:38:59.457 30452 ERROR oslo_messaging.rpc.dispatcher timeout)
2016-09-14 13:38:59.457 30452 ERROR oslo_messaging.rpc.dispatcher File "/opt/stack/venv/designate-20160905T180556Z/lib/python2.7/site-packages/designate/mdns/notify.py", line 304, in _send_dns_message
2016-09-14 13:38:59.457 30452 ERROR oslo_messaging.rpc.dispatcher dns_message, host, port=port, timeout=timeout)
2016-09-14 13:38:59.457 30452 ERROR oslo_messaging.rpc.dispatcher File "/opt/stack/venv/designate-20160905T180556Z/lib/python2.7/site-packages/dns/query.py", line 222, in udp
2016-09-14 13:38:59.457 30452 ERROR oslo_messaging.rpc.dispatcher if _addresses_equal(af, from_address, destination) or \
2016-09-14 13:38:59.457 30452 ERROR oslo_messaging.rpc.dispatcher File "/opt/stack/venv/designate-20160905T180556Z/lib/python2.7/site-packages/dns/query.py", line 153, in _addresses_equal
2016-09-14 13:38:59.457 30452 ERROR oslo_messaging.rpc.dispatcher n2 = dns.inet.inet_pton(af, a2[0])
2016-09-14 13:38:59.457 30452 ERROR oslo_messaging.rpc.dispatcher File "/opt/stack/venv/designate-20160905T180556Z/lib/python2.7/site-packages/dns/inet.py", line 50, in inet_pton
2016-09-14 13:38:59.457 30452 ERROR oslo_messaging.rpc.dispatcher return dns.ipv4.inet_aton(text)
2016-09-14 13:38:59.457 30452 ERROR oslo_messaging.rpc.dispatcher File "/opt/stack/venv/designate-20160905T180556Z/lib/python2.7/site-packages/dns/ipv4.py", line 46, in inet_aton
2016-09-14 13:38:59.457 30452 ERROR oslo_messaging.rpc.dispatcher raise dns.exception.SyntaxError
2016-09-14 13:38:59.457 30452 ERROR oslo_messaging.rpc.dispatcher SyntaxError
2016-09-14 13:38:59.457 30452 ERROR oslo_messaging.rpc.dispatcher
After further debugging the issue and adding some debug logs I found that , MDNS tries to parse DNSserver hostname as an IP .
Looks like it tries to do compare Hostname with IP , i.e it tries to compare 208.78.70.13 with ns1.p13.dynect.net
So, there's a quick "fix" we can do while we figure out the right thing to do.
Quick fix: validate the values are IPs, fail to import the YAML if there not.
Longer fix: Resolve the IPs before passing to dnspython. This is harder than it sounds, because we must reapect TTLs and shouldn't do the lookup for every single notify we send.