Hi everyone!
I have problems with some domains For ex. When I do google.com sometimes I get ns records but sometimes I get SERFVAIL also it happens basically with google. When I restrart pdns it works normally for 5 minutes. Then again SERVFAIL. Strange, some domains works some not works.. Even if cache hits. I increased cache ttls not helped. Server details: 8 core cpu, 8 GB of Ram. Load: pdns 100%, mysql 120%, pdns-recursor 30%, network 40 mbps. Some logs: Nov 10 15:33:08 ns01 pdns_recursor[15237]: Sending SERVFAIL to 127.0.0.1 during resolve of 'gm-realm.net.' because: Too much time waiting for gm-realm.net.|A, timeouts: 5, throttles: 1, queries: 6, 7578msec Nov 10 15:33:09 ns01 pdns_recursor[15237]: Sending SERVFAIL to 127.0.0.1 during resolve of 'gm-realm.net.' because: Too much time waiting for gm-realm.net.|A, timeouts: 5, throttles: 2, queries: 6, 7504msec Nov 10 15:33:12 ns01 pdns_recursor[15237]: Sending SERVFAIL to 127.0.0.1 during resolve of 'gm-realm.net.' because: Too much time waiting for gm-realm.net.|A, timeouts: 5, throttles: 3, queries: 6, 7502msec Nov 10 15:33:13 ns01 pdns_recursor[15237]: Sending SERVFAIL to 127.0.0.1 during resolve of 'us.micardapi.micloud.xiaomi.net.' because: Too much time waiting for us.api.micloud.mi.com.|A, timeouts: 5, throttles: 0, queries: 7, 7709msec Nov 10 15:33:18 ns01 pdns_recursor[15237]: Sending SERVFAIL to 127.0.0.1 during resolve of 'www.coocent.net.' because: Too much time waiting for s-149179.abc188.com.|A, timeouts: 5, throttles: 0, queries: 8, 8093msec Nov 10 15:33:18 ns01 pdns_recursor[15237]: Sending SERVFAIL to 127.0.0.1 during resolve of 'www.6ud1.com.' because: Too much time waiting for www.6ud1.com.|A, timeouts: 5, throttles: 0, queries: 6, 7502msec Nov 10 15:42:52 ns01 pdns_recursor[15237]: stats: 1787915 questions, 497334 cache entries, 86066 negative entries, 11% cache hits Nov 10 15:42:52 ns01 pdns_recursor[15237]: stats: throttle map: 6856, ns speeds: 29645 Nov 10 15:42:52 ns01 pdns_recursor[15237]: stats: outpacket/query ratio 49%, 11% throttled, 0 no-delegation drops Nov 10 15:42:52 ns01 pdns_recursor[15237]: stats: 211 outgoing tcp connections, 1 queries running, 50712 outgoing timeouts Nov 10 15:42:52 ns01 pdns_recursor[15237]: stats: 322566 packet cache entries, 61% packet cache hits Nov 10 15:42:52 ns01 pdns_recursor[15237]: stats: 926 qps (average over 1930 seconds) Config: I have one master server which replicates db to the four slave server. # cat recursor.conf .. hint-file=/etc/pdns/named.root allow-from=127.0.0.0/8 local-address=127.0.0.1 local-port=5353 version-string=Bind Recursor .. # cat /etc/pdns/pdns.conf .. launch=gmysql gmysql-host=127.0.0.1 gmysql-port=3306 gmysql-user=p_owerdns gmysql-password=verysecretpassword gmysql-dbname=p_ owerdns gmysql-dnssec="yes" #allow to customers allow-recursion=127.0.0.1/8, 172.16.0.0/16, 10.0.0.0/8, xxx.xxx.xxx.xxx/16 #master #allow-axfr-ips=172.16.6.30 local-address=0.0.0.0 local-port=53 control-console=no query-cache-ttl=18600 cache-ttl=18600 default-ttl=7200 soa-expire-default=18600 soa-minimum-ttl=3600 soa-refresh-default=10800 soa-retry-default=3600 daemon=yes default-soa-name=ns.master.mydomain.net distributor-threads=18 guardian=yes #lazy-recursion=yes master=no slave=yes slave-cycle-interval=600 max-tcp-connections=100 max-queue-length=50000 recursor=127.0.0.1:5353 out-of-zone-additional-processing=yes webserver=yes webserver-address=172.16.6.34 webserver-password=adminadminadmin webserver-port=8081 webserver-print-arguments=yes #loglevel=9 #log-dns-details=yes #log-dns-queries=yes #query-logging=yes version-string=Bind Resolver ..
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