clients-per-query message is harmful or not?
chulmin2 at hotmail.com
Mon Dec 28 18:13:02 UTC 2009
So thanks for your kind reply.
I'm curious the meaning of "given name".
if clients query like below,
# example.com zone
above queries are same query or diffferent one?
and is there any method that which
name queries are much?
Thanks in advance.
>> Hello, all.
>> my system is centos 4.x, bind 9.5.1-P3 and only recursion is allowed from some ranges.
>> I can see lots of messages like below.
>> so if I didn't set any clients-per-query value,some clients' queries may be droppped or not?
> clients-per-query is designed to prevent the nameserver being
> overwhelmed by a given query that doesn't resolve. It sets the
> number of simultanious clients that are acutally recursing on a
> given name. It value is increased if there is a successful resolution
> of that query after dropping some clients then slowly decays over time.
> Note UDP clients are expected to retry.
> clients-per-query reflects how many clients ask for a busy name/type in
> the time it takes to resolve that name/type. If it takes 200 ms resolve
> the query and you need 20 clients-per-query then the name/type is being
> asked for around 100 times a second.
>> If some queries can be dropped,I want to set like "clients-per-query 0".
> You actually want to set clients-per-query to around 20 based on
> these logs, the default is 10.
>> 05-Oct-2009 16:04:46.228 resolver: notice: clients-per-query decreased to 14
>> 05-Oct-2009 16:14:47.337 resolver: notice: clients-per-query increased to 19
>> 05-Oct-2009 16:34:47.338 resolver: notice: clients-per-query decreased to 18
>> 05-Oct-2009 16:54:47.339 resolver: notice: clients-per-query decreased to 17
>> 05-Oct-2009 17:01:55.424 resolver: notice: clients-per-query increased to 22
>> 05-Oct-2009 20:20:26.252 resolver: notice: clients-per-query increased to 15
>> 05-Oct-2009 20:40:26.253 resolver: notice: clients-per-query decreased to 14
>> 05-Oct-2009 21:00:26.253 resolver: notice: clients-per-query decreased to 13
>> 05-Oct-2009 21:11:26.298 resolver: notice: clients-per-query increased to 15
>> Thanks in advance.
> Mark Andrews, ISC
> 1 Seymour St., Dundas Valley, NSW 2117, Australia
> PHONE: +61 2 9871 4742 INTERNET: marka at isc.org
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