nscd and DNS cache

[JD]

On 05/16/2012 01:29 AM, Ed Greshko wrote:
> On 05/16/2012 02:54 PM, JD wrote:
>> I understand the libs are what make calls to the resolver. But even
>> the resolver must look
>> at /etc/resolv.conf.
> Well, you did say:  "Am I to believe that the browser is NOT using /etc/resolv.conf"
> which to me reads that you were thinking that somehow the browser itself should be
> using resolv.conf.  I'm sorry if I misread what you wrote.
>
>> If it is empty, NOTHING gets resolved.
> Not "entirely" true.
>
> With named not running.....
>
> [egreshko at f16-1 ~]$ cat /etc/resolv.conf
> # Generated by NetworkManager
> #search greshko.com
> #nameserver 192.168.0.55
>
> [egreshko at f16-1 ~]$ ping misty
> PING misty (192.168.0.55) 56(84) bytes of data.
> 64 bytes from misty (192.168.0.55): icmp_req=1 ttl=64 time=1.99 ms
>
> since /etc/nsswitch.conf contains
>
> hosts:      files dns
>
> and /etc/hosts contains
>
> 192.168.0.55 misty
>
> if you take the "files" out of the hosts line....then NOTHING gets resolved.
nsswitch comes out of the box with files listed first for hosts resolution.
I do not modify it.
>
>> I was using nscd thinking it is a lightweight caching resolver. But as
>> it turns out it is useless.
>> Time for fedora to bury it :)
>> Re: My router: it does very little if any caching - and has no
>> configuration for it at all.
>>
>> I will try bind.
> I've not used it....but have heard good things about dnsmasq which, according to yum
> info, is A lightweight DHCP/caching DNS server.
I have used dnsmasq as well, and communicated with it's author
a couple of years ago.
But as I recall, it did not seem to help much, as I observed that
browsing to a website with just a couple of minutes lapse time,
FF showed on the status line it was  looking up the domain.
Perhaps the cache expiry was set to a very short  time?