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. ------------------------------ (주)아이비아이(www.ibi.net) DNS사업부/본부장 02-2165-7234/010-3558-3736 [03909]서울 마포구 매봉산로 37(상암동, DMC산학협력센터1304호)
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