RE: CF DNS Cache

[Brad Wood]

I don't know that CF caches DNS, but I bet the OS probably does.

Is this a one-time thing, or do you need to pragmatically do this on a
regular basis through your application?

~Brad

-----Original Message-----
From: Jenny Gavin-Wear [mailto:jennygw@...]
Sent: Tuesday, July 08, 2008 4:52 PM
To: CF-Talk
Subject: CF DNS Cache

Does CF (7) ever clear it's DNS cache, or does it have to be done via a
restart, please?

Jenny

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[Qing Xia]

Here's an interesting article on this subject:

http://tjordahl.blogspot.com/2004/10/cfmx-and-dns-caching.html

On Tue, Jul 8, 2008 at 5:55 PM, Brad Wood <bradwood@...>
wrote:

> I don't know that CF caches DNS, but I bet the OS probably does.
>
> Is this a one-time thing, or do you need to pragmatically do this on a
> regular basis through your application?
>
> ~Brad
>
> -----Original Message-----
> From: Jenny Gavin-Wear [mailto:jennygw@...]
> Sent: Tuesday, July 08, 2008 4:52 PM
> To: CF-Talk
> Subject: CF DNS Cache
>
> Does CF (7) ever clear it's DNS cache, or does it have to be done via a
> restart, please?
>
> Jenny
>
>

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[Sherif Abdou]

not meant to take over this thread but i am guessing that cf does cache DNS since i get aggregated by adobe feeds and ever since i moved my hosting I have to manually ping it inorder for it to update. if i switch back to my old host then it works fine.



----- Original Message ----
From: Brad Wood <bradwood@...>
To: CF-Talk <cf-talk@...>
Sent: Tuesday, July 8, 2008 5:01:27 PM
Subject: RE: CF DNS Cache

Hmm, looks like I was wrong.  Java does cache DNS.  Furthermore, it
appears to ignore TTL values.

Here's a page talking about it:
http://www.rgagnon.com/javadetails/java-0445.html

I'm not sure exactly how that all translates to CF though.

~Brad

-----Original Message-----
From: Brad Wood [mailto:bradwood@...]
Sent: Tuesday, July 08, 2008 4:55 PM
To: CF-Talk
Subject: RE: CF DNS Cache

I don't know that CF caches DNS, but I bet the OS probably does.



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[Brad Wood]

I don't think that would make a difference.  
You could ping an aggregator all day long, but if they are caching the
IP address your domain USED to point to, it still wouldn't pick up your
current feed.

The only way I can think of that would work is if you were manually
pinging them with a URL that used your IP address instead of a hostname
like http://123.123.123.123/rss.cfm.

Perhaps your RSS is located in a different place now and you haven't
updated your ping URLs in your blog software.

Or alternatively, the aggregator uses a separate server to do their
automated aggregating, and the server that responds to pings is a
different one.  i.e. The regularly scheduled aggregating still has your
old IP cached, but the ping URL hits an entirely different server which
doesn't have it cached.  

~Brad

-----Original Message-----
From: Sherif Abdou [mailto:sherif626@...]
Sent: Wednesday, July 09, 2008 2:41 PM
To: CF-Talk
Subject: Re: CF DNS Cache

not meant to take over this thread but i am guessing that cf does cache
DNS since i get aggregated by adobe feeds and ever since i moved my
hosting I have to manually ping it inorder for it to update. if i switch
back to my old host then it works fine.

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