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Performance penalty when using regular expressions in server_name?

Igor Sverkos
January 29, 2014 02:54PM
Hi,

let assume that we run the following domains:

- agoodexample.org
- agoodexmaple.com
- agoodexample.net
- a-good-example.org
- a-good-example.com
- a-good-example.net

Our main site should be www.a-good-example.com -- people coming from any
other mentioned domain/combination should be redirected to the main site.

I could now write a single server block like

server {
// ...
server_name ~^(?:www\.)?a[-]?good-example\.(?:org|net)$
~^ a[-]?good-example\.com $;

rewrite ^ $scheme://www.a-good-example.com $request_uri permanent;
}

I am using regular expressions as server_name values, I think you get the
point.

I could also avoid regular expressions:

server {
// ...
server_name agoodexample.org
a-good-example.org
www.agoodexample.org
www.a-good-example.org
agoodexample.net
a-good-example.net
www.agoodexample.net
www.a-good-example.net
agoodexample.com
www.agoodexample.com
a-good-example.com;

rewrite ^ $scheme://www.a-good-example.com $request_uri permanent;
}


Q1: Are both configurations equal or is there any performance difference?
E.g. would you recommend one configuration more than the other?


Q2: When using regular expressions in server_name, the regular expression
will also appear in the error_log. Is it possible to see the actual
name instead the expression in the log?


I am using nginx-1.4.x with pcre-jit enabled.

Thanks.


--
Regards,
Igor

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Subject Author Posted

Performance penalty when using regular expressions in server_name?

Igor Sverkos January 29, 2014 02:54PM

Re: Performance penalty when using regular expressions in server_name?

itpp2012 January 29, 2014 03:15PM

Re: Performance penalty when using regular expressions in server_name?

Igor Sysoev January 30, 2014 01:54AM



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