Re: [squid-users] intermittent DNS problems

Dear Mark,

Thanks for your comments.

I've checked access.log, they're all common domain/urls. and at that period,
all domains/requests fails.

now I've added dubug_options 78,2 to check if there's any dns error or not.
because of heavy traffic I can not use 78,9

in my resov.conf, I have 2 dns servers which I'm sure during squid failure
period, they're working fine, I've checked them with the same failing url on
another server and it resolved correctly.

Regards,
Pierre.

>From: Mark Elsen <mark.elsen@gmail.com>
>To: Pierre Tor <pierre_tor@hotmail.com>
>CC: squid-users@squid-cache.org
>Subject: Re: [squid-users] intermittent DNS problems
>Date: Mon, 26 Dec 2005 07:45:19 -0500
>
> > Hi,
> >
> > I'm using SQUID 2.5 STABLE11 on FreeBSD 5.4. Squid is using internal DNS
> > (configured without --disable-internal-dns)
> >
> > Squid is working fine with 8Mbps traffic, but there're some intermittent
>DNS
> > problems, which at those times squid do not serve requests, at the same
>time
> > when I tried to resolve a domain(www.google.com) with nslookup on
>freebsd,
> > dns timed-out! (My Windows Server 2003 DNS servers are working fine as I
> > checked them from other servers and nslookup resolves.)
> >
> > After a few minutes (2-4), nslookup resolves and squid start serving
> > requests again.
> >
> > What is causing this problem?
> > Is it FreeBSD or SQUID?
> >
> > I didn't increase number of dns processes, because I'm using internal
>dns.
> >
>
> - Checkout access.log for those requests which are failing, if the
>DNS problem is apparent.
>
> - Also ,review cache.log completely, watchout for any errors related to
>DNS or other stuff.
>
> - If nslookup fails to, you are likely to have system problems.
> The dnsservers are determined in /etc/resolv.conf.
> Use more then one dns server.
>
> M.

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Received on Tue Dec 27 2005 - 02:22:57 MST