[Pdns-users] Problems with PowerDNS

Tue Nov 10 14:00:13 UTC 2015

Dear Peter van Dijk, my connection link is 1000Gbps, server hardware from cisco ucs. There is no problem with hardware. But mysql uses huge resources even not zone in db it sends 4-5 queries to the db.

I used percone tools to optimize mysql configuration. But it decreased cpu usage only 10%. I have 10.000 query per second.

Maybe I need do some tuning on TTLs?

-----Original Message-----
From: pdns-users-bounces at mailman.powerdns.com [mailto:pdns-users-bounces at mailman.powerdns.com] On Behalf Of Peter van Dijk
Sent: 10 noyabr 2015, çərşənbə axşamı 16:58
To: pdns-users at mailman.powerdns.com
Subject: Re: [Pdns-users] Problems with PowerDNS

Hello Nadir,

based on the logs, it looks like your powerdns has trouble reaching the Internet at all. Are you on a slow or congested link? Note that in general your machine looks quite busy!

Kind regards,
--
Peter van Dijk
PowerDNS.COM BV - https://www.powerdns.com/

On 10 Nov 2015, at 13:01, Nadir M. Aliyev wrote:

> 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
>
> ..
>
> _______________________________________________
> Pdns-users mailing list
> Pdns-users at mailman.powerdns.com
> http://mailman.powerdns.com/mailman/listinfo/pdns-users

_______________________________________________
Pdns-users mailing list
Pdns-users at mailman.powerdns.com
http://mailman.powerdns.com/mailman/listinfo/pdns-users