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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