DNS Cache location?

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Level 2

295 points

DNS Cache location?

I'm just curious where OS X Server 10.6 stores its DNS cache or if there is a Terminal command I can use to display all of the caches from my network.

Thanks!

Mac Mini 1.66 Core Duo 2GB Server, MacBook Pro 15" (Santa Rosa), Mac OS X (10.6.4)

Posted on Jul 5, 2010 12:37 PM

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Answer 1

Jul 5, 2010 1:01 PM in response to Motoxxbiker

Not the answer to your question, but probably along the path to your goal:


$ rndc flush

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Answer 2

Camelot

Level 9

54,333 points

Jul 5, 2010 2:05 PM in response to MrHoffman

rndc controls named, the name server, so is only relevant if you're running a DNS server on your machine.

In contrast, the host resolver is controlled via dscacheutil, specifically:

dscacheutil -flushcache

will flush the resolver cache. There's also a -cachedump switch which supposedly shows you the cache content, but I can never seem to make it work (either that, or it's not caching the data I expect).

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Answer 3

Motoxxbiker Author

Level 2

295 points

Jul 5, 2010 2:55 PM in response to Camelot

Thanks, I am running a DNS server on my Mac.

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Answer 4

Motoxxbiker Author

Level 2

295 points

Jul 6, 2010 6:30 PM in response to MrHoffman

Hi, if I do:


sudo rndc flush

I get this as an error:


rndc: connect failed: 127.0.0.1#953: connection refused

How can I fix this?

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Answer 5

Motoxxbiker Author

Level 2

295 points

Jul 6, 2010 7:15 PM in response to Motoxxbiker

OK I got it to work by editing named.conf becuase it was this before:

+controls {+
+inet 127.0.0.1 port 54 allow {any; }+
+keys { "rndc-key"; };+
};

which listened on port 54 and the error I was getting was from 953. so I changed 54 to 953 and it worked. _Is this bad to keep this way or should I change it back?_

Now:

+controls {+
+inet 127.0.0.1 port 953 allow {any; }+
+keys { "rndc-key"; };+
};

Message was edited by: Motoxxbiker

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Answer 6

Jul 6, 2010 7:32 PM in response to Motoxxbiker

Check the system logs. See if there's an error on that end indicating any additional details of the problem. (The management port access is understandably restricted.)

This might require setting up /etc/rndc.conf by running rndc-confgen - have a look at the bind9 documentation and at the man pages for rndc and rndc.conf and rndc-confgen and Google around - and this will allow you to authenticate into the management port of the DNS server.

It's also rare that there's a need to flush the DNS caches.

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Answer 7

Motoxxbiker Author

Level 2

295 points

Jul 6, 2010 7:39 PM in response to MrHoffman

Haha, wow just for future reference you can do:


sudo rndc -p 54 dumpdb

instead of modifying the port! Thanks for the help - now I know where all of the DNS caches are stored!

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