[PHP] gethostbyname () uses old DNS server

[Kent Tong]

Hi,

We have moved our DNS server from one IP to another. But on a Linux
server, the PHP programs keep using the old DNS server IP. For 
example, for a simple php file:



When it is run, it tries to lookup smtp.cpttm using the old DNS 
server (I know it using tcpdump). The new DNS server is specified in 
/etc/resolv.conf. If I issue "ping smtp.cpttm" in a command prompt,
then tcpdump shows that it is accessing the new DNS server.

Any idea? Thanks.

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[PHP] Re: gethostbyname () uses old DNS server

[Kent Tong]

Stut  gmail.com> writes:

> Assuming you're using a web server it's possible PHP is caching the DNS 
> server details. Try restarting the web server. Alternatively try the 
> same script on the command line.

Wow! You're right! Stopping apache and then starting it (in two steps) 
solves the problem! In fact, I had tried restarting it 
(/etc/init.d/apache restart) but it didn't make any difference.

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