[Pdns-users] 1 sec delay before DNS-answer at pdns-recursor

[Shamus Smith]

Hello all,

thanks for all your answers, but I'm still stuck. Below is the full output for dig for pdns and dnsmasq.
The query time is 2 ms for the first uncached request and 0 ms for pdns and dnsmasq. However, the
whole execution of the dig command takes over 1 second for pdns and below 30 ms for dnsmasq. The
same for nslookup.

For the second request trace just shows: 1 question answered from packet cache from 127.0.0.1
But it still takes more than 1 second.

- /etc/pdns-recursor/recursor.conf (default-config from package plus own forward-zone, removed comments)
forward-zones=.=8.8.8.8
setgid=pdns-recursor
setuid=pdns-recursor

- /etc/dnsmasq.conf (default-config from package, removed comments)
bogus-priv
cache-size=1500
domain-needed
no-hosts

- /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

/etc/nsswitch.conf was not modified and there is absolutely no load on the machine.
I do not have a LDAP user database, this is just a minimum install of CentOS 6.5.

Any ideas?

Thanks,
Shamus


# /etc/init.d/pdns-recursor start
pdns-recursor starten:                                     [  OK  ]
# time dig www.google.com @localhost

; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.17.rc1.el6_4.4 <<>> www.google.com @localhost
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 48006
;; flags: qr rd ra; QUERY: 1, ANSWER: 5, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;www.google.com.                        IN      A

;; ANSWER SECTION:
www.google.com.         174     IN      A       173.194.35.176
www.google.com.         174     IN      A       173.194.35.180
www.google.com.         174     IN      A       173.194.35.177
www.google.com.         174     IN      A       173.194.35.179
www.google.com.         174     IN      A       173.194.35.178

;; Query time: 2 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Tue Jun 25 23:51:28 2013
;; MSG SIZE  rcvd: 112


real    0m1.026s
user    0m0.011s
sys     0m0.014s
# time dig www.google.com @localhost

; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.17.rc1.el6_4.4 <<>> www.google.com @localhost
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 3613
;; flags: qr rd ra; QUERY: 1, ANSWER: 5, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;www.google.com.                        IN      A

;; ANSWER SECTION:
www.google.com.         84      IN      A       173.194.35.176
www.google.com.         84      IN      A       173.194.35.180
www.google.com.         84      IN      A       173.194.35.177
www.google.com.         84      IN      A       173.194.35.179
www.google.com.         84      IN      A       173.194.35.178

;; Query time: 0 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Tue Jun 25 23:52:58 2013
;; MSG SIZE  rcvd: 112


real    0m1.024s
user    0m0.005s
sys     0m0.019s
# /etc/init.d/pdns-recursor stop
pdns-recursor beenden:                                     [  OK  ]
# /etc/init.d/dnsmasq start
Starting dnsmasq:                                          [  OK  ]
# time dig www.google.com @localhost

; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.17.rc1.el6_4.4 <<>> www.google.com @localhost
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 6269
;; flags: qr rd ra; QUERY: 1, ANSWER: 5, AUTHORITY: 4, ADDITIONAL: 4

;; QUESTION SECTION:
;www.google.com.                        IN      A

;; ANSWER SECTION:
www.google.com.         67      IN      A       173.194.35.178
www.google.com.         67      IN      A       173.194.35.179
www.google.com.         67      IN      A       173.194.35.180
www.google.com.         67      IN      A       173.194.35.176
www.google.com.         67      IN      A       173.194.35.177

;; AUTHORITY SECTION:
google.com.             54608   IN      NS      ns1.google.com.
google.com.             54608   IN      NS      ns3.google.com.
google.com.             54608   IN      NS      ns2.google.com.
google.com.             54608   IN      NS      ns4.google.com.

;; ADDITIONAL SECTION:
ns1.google.com.         54882   IN      A       216.239.32.10
ns2.google.com.         54882   IN      A       216.239.34.10
ns3.google.com.         54882   IN      A       216.239.36.10
ns4.google.com.         54882   IN      A       216.239.38.10

;; Query time: 2 msec
;; SERVER: ::1#53(::1)
;; WHEN: Tue Jun 25 23:53:15 2013
;; MSG SIZE  rcvd: 248


real    0m0.028s
user    0m0.008s
sys     0m0.019s
# time dig www.google.com @localhost

; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.17.rc1.el6_4.4 <<>> www.google.com @localhost
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 28137
;; flags: qr rd ra; QUERY: 1, ANSWER: 5, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;www.google.com.                        IN      A

;; ANSWER SECTION:
www.google.com.         65      IN      A       173.194.35.177
www.google.com.         65      IN      A       173.194.35.176
www.google.com.         65      IN      A       173.194.35.180
www.google.com.         65      IN      A       173.194.35.179
www.google.com.         65      IN      A       173.194.35.178

;; Query time: 0 msec
;; SERVER: ::1#53(::1)
;; WHEN: Tue Jun 25 23:53:17 2013
;; MSG SIZE  rcvd: 112


real    0m0.022s
user    0m0.007s
sys     0m0.016s
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