Issue with DNS slave cluster
Hi,
We have cpanel dns only cluster running for our ns1 and ns2. We could see the below error in "/var/log/messages" of ns2 server, which is Centos 7.7 cpanel dns only server.
While checking the named service status. I can see service running but there is errors. We can see dns failures on random checks. Is it related to this? How we can solve the issue?
Oct 14 19:41:18 ns2 named[21919]: ../../../../lib/isc/unix/socket.c:5682: unexpected error:
Oct 14 19:41:18 ns2 named[21919]: ../../../../lib/isc/unix/socket.c:5682: unexpected error:
Oct 14 19:41:18 ns2 named[21919]: ../../../../lib/isc/unix/socket.c:5682: unexpected error:
Oct 14 19:41:18 ns2 named[21919]: ../../../../lib/isc/unix/socket.c:5682: unexpected error:
Oct 14 19:41:18 ns2 named[21919]: ../../../../lib/isc/unix/socket.c:5682: unexpected error:
Oct 14 19:41:18 ns2 named[21919]: ../../../../lib/isc/unix/socket.c:5682: unexpected error:
Oct 14 19:47:17 ns2 named[22141]: ../../../../lib/isc/unix/socket.c:5682: unexpected error:
Oct 14 19:47:17 ns2 named[22141]: ../../../../lib/isc/unix/socket.c:5682: unexpected error:
Oct 14 19:47:17 ns2 named[22141]: ../../../../lib/isc/unix/socket.c:5682: unexpected error:
Oct 14 19:47:17 ns2 named[22141]: ../../../../lib/isc/unix/socket.c:5682: unexpected error:
Oct 14 19:47:17 ns2 named[22141]: ../../../../lib/isc/unix/socket.c:5682: unexpected error:
Oct 14 19:47:17 ns2 named[22141]: ../../../../lib/isc/unix/socket.c:5682: unexpected error:
Oct 14 19:47:17 ns2 named[22141]: ../../../../lib/isc/unix/socket.c:5682: unexpected error:
Oct 14 19:47:17 ns2 named[22141]: ../../../../lib/isc/unix/socket.c:5682: unexpected error:While checking the named service status. I can see service running but there is errors. We can see dns failures on random checks. Is it related to this? How we can solve the issue?
service named status
Redirecting to /bin/systemctl status named.service
? named.service - Berkeley Internet Name Domain (DNS)
Loaded: loaded (/usr/lib/systemd/system/named.service; enabled; vendor preset: disabled)
Drop-In: /etc/systemd/system/named.service.d
??cpanel.conf
Active: active (running) since Mon 2019-10-14 19:41:18 UTC; 3s ago
Process: 21902 ExecStop=/bin/sh -c /usr/sbin/rndc stop > /dev/null 2>&1 || /bin/kill -TERM $MAINPID (code=exited, status=0/SUCCESS)
Process: 21918 ExecStart=/usr/sbin/named -u named -c ${NAMEDCONF} $OPTIONS (code=exited, status=0/SUCCESS)
Process: 21914 ExecStartPre=/bin/bash -c if [ ! "$DISABLE_ZONE_CHECKING" == "yes" ]; then /usr/sbin/named-checkconf "$NAMEDCONF"; else echo "Checking of zone files is disabled"; fi (code=exited, status=0/SUCCESS)
Main PID: 21919 (named)
CGroup: /system.slice/named.service
??21919 /usr/sbin/named -u named -c /etc/named.conf
Oct 14 19:41:18 ns2 named[21919]: automatic empty zone: view internal: 8.B.D.0.1.0.0.2.IP6.ARPA
Oct 14 19:41:18 ns2 named[21919]: automatic empty zone: view internal: EMPTY.AS112.ARPA
Oct 14 19:41:18 ns2 named[21919]: automatic empty zone: view internal: HOME.ARPA
Oct 14 19:41:18 ns2 named[21919]: none:104: 'max-cache-size 90%' - setting to 3686MB (out of 4096MB)
Oct 14 19:41:18 ns2 named[21919]: set up managed keys zone for view external, file 'external.mkeys'
Oct 14 19:41:18 ns2 named[21919]: none:104: 'max-cache-size 90%' - setting to 3686MB (out of 4096MB)
Oct 14 19:41:18 ns2 named[21919]: ../../../../lib/isc/unix/socket.c:5682: unexpected error:
Oct 14 19:41:18 ns2 named[21919]: setsockopt(28, TCP_FASTOPEN) failed with Protocol not available
Oct 14 19:41:18 ns2 named[21919]: command channel listening on 127.0.0.1#953
Oct 14 19:41:18 ns2 systemd[1]: Started Berkeley Internet Name Domain (DNS).-
Can you please open a ticket using the link in my signature? Once open please reply with the Ticket ID here so that we can update this thread with the resolution once the ticket is resolved. Thanks! 0 -
I guess it's related to TCP_FASTOPEN issue on old kernel. which kernel version your server is currently running? 0
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