RE: Please help with stuck BIND-9.9.11-P1 named process on rndc reconfig

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RE: Please help with stuck BIND-9.9.11-P1 named process on rndc reconfig

Sunghwan Kim(IBI)

Hi BIND expert,

 

I could not have sent the followings thru https://www.isc.org/bind-subscription-contact/

due to error on the site.

 

--------------

I am a S/W engineer who is working on BIND, especially named in Seoul/Korea.

 

I've got reports from a customer regarding stucked "named" process which had

not been performed any request from clients for  5 secs during "rndc reconfig"

even if it is used to be finished in 700ms

 

24-Aug-2018 17:36:39.073 general: info: received control channel command 'reconfig'

..

24-Aug-2018 17:36:44.100 general: info: any newly configured zones are now loaded

 

 My customer's DNS server has been installing BIND-9.9.11-P1.

 

I would like to figure out why named was stucked for even 5 secs on rndc reconfig.

I've figured out I/O event values(majflt/s) of SAR information on the server is quite high

which is 58.34 even if it usually is 0.18 ~ 0.32.

The server information is as following;

1. OS : CentOS 7.3

2. CPU : Intel Xeon3.5Ghz 64bits(6 CPUs, 2 cores per CPU)

3. Mem. : 8G

 

Would you please give me any information about it ?

I know a lot of fixes on rndc reconfig for latter version of 9.9.11-P1

 

Please take a look at the following logs from bind for your information;

=== general log =====

24-Aug-2018 17:36:39.073 general: debug 1: received control channel command 'null'

24-Aug-2018 17:36:39.073 general: info: received control channel command 'reconfig'

24-Aug-2018 17:36:39.073 general: info: loading configuration from '/etc/named.conf'

24-Aug-2018 17:36:39.159 general: info: unable to open 'conf/named.iscdlv.key' using built-in keys

24-Aug-2018 17:36:39.168 general: info: using default UDP/IPv4 port range: [9000, 61000]

24-Aug-2018 17:36:39.169 general: info: using default UDP/IPv6 port range: [9000, 61000]

24-Aug-2018 17:36:39.190 general: info: sizing zone task pool based on 4704 zones

24-Aug-2018 17:36:39.293 general: debug 1: zone_settimer: zone xn--pi5bm5e/IN: enter

….(removed)…..

24-Aug-2018 17:36:41.809 general: debug 1: zone_settimer: zone xn--o78b/IN: enter

24-Aug-2018 17:36:41.816 general: info: dns64 reverse zone: 0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.b.9.f.f.4.6.0.0.ip6.arpa.

….(removed)…..

24-Aug-2018 17:36:43.927 general: debug 1: now using logging configuration from config file

24-Aug-2018 17:36:43.935 general: info: zone 0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.b.9.f.f.4.6.0.0.ip6.arpa/IN: (master) removed

24-Aug-2018 17:36:43.938 general: debug 1: load_configuration: success

24-Aug-2018 17:36:43.938 general: info: reloading configuration succeeded

…………

 

It would be appreciated if you share any hints, information.

 

Regards,

Sunghwan.

 

------------------------------

()아이비아이(www.ibi.net)

DNS사업부/본부장

02-2165-7234/010-3558-3736

[03909]서울 마포구 매봉산로 37(상암동, DMC산학협력센터1304)

 


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