[Dnsmasq-discuss] Should results from --server be cached?

Simon Kelley simon at thekelleys.org.uk
Thu Mar 15 17:09:46 GMT 2018


Yes, they should be cached. The dnsmasq --log-queries option will tell
you when or not a particular answer comes from the cache, which should
give you confidence about what's happening in this case.


Cheers,

Simon.



On 12/03/18 17:53, Michael Tolan wrote:
> Hi all,
> 
> I want to ask whether queries for A records matching a --server argument
> are expected to be cached. I'm running an instance of dnsmasq with the
> following arguments:
> 
> dnsmasq -k --all-servers --cache-size=10000 --log-facility=-
> --server=/cluster.local/127.0.0.1#10053 <http://127.0.0.1#10053>
> --server=/in-addr.arpa/127.0.0.1#10053 <http://127.0.0.1#10053>
> --server=/in6.arpa/127.0.0.1#10053 <http://127.0.0.1#10053>
> --dns-forward-max=2048 --log-queries --no-negcache
> 
> I would expect when it receives a query for a domain name matching
> .cluster.local, that dnsmasq would forward the request to the specified
> nameserver (127.0.0.1#10053) and that it would cache the response for
> the duration of the TTL that the 127.0.0.1#10053 nameserver specifies. 
> 
> The behavior I'm obsering is that when requests are made for a
> cluster.local domain, they are always forwarded to the 127.0.0.1#10053
> nameserver. 
> 
> Cache insertion metrics lead me to believe that response records are
> being inserted into the cache, however, subsequent requests for the same
> cluster.local address aren't actually served from the cache.
> 
> So my question is, am I misunderstanding the behavior of the --server
> arugment as it relates to populating the cache? Or is it possible that
> dnsmasq is forwarding the query prior to checking whether the requested
> value already exists in the cache?
> 
> Thanks very much,
> -Michael
> 
> 
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