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From Steve Swift <Swi...@swiftys.org.uk>
Subject Re: [users@httpd] RE: Can you use variables inside a conf file?
Date Sun, 29 Jan 2012 22:00:47 GMT
I'll investigate mod_macro. Thank you.

On 29 January 2012 11:01, Rainer Jung <rainer.jung@kippdata.de> wrote:

> On 29.01.2012 09:42, Steve Swift wrote:
>
>> Out of curiosity, is it possible to define the same environment
>> variable, but with different values, in different VirtualHosts? I
>> presume this can't be done, as all of the hosts would inherit the same
>> environment, including the environment variables.
>>
>> For example, I have live and test versions of every "server" in our
>> apache. The live server uses directory /cgi-bin/ and the test server
>> uses /cgi-test/. This means that we have to define things like aliases
>> in both live and test VirtualHosts. This means we can screw them up...
>>
>> I've always wanted to define some sort of "local" variable in each
>> VirtualHost, containing the location of the cgi directory. Then we could
>> INCLUDE the same set of aliases in both the live and test hosts, but
>> they would pick up their respective paths.
>>
>> In fact, I've often wished that the Apache configuration would support
>> its own internal variables, but so far nothing has happened. I must not
>> be wishing hard enough.
>>
>
> Sorry, mod_define and the builtin variables for Apache 2.4 only support
> global variables.
>
> Maybe mod_macro could help you. It allows to specify recurring config
> snipets which you can instantiate using parameters.
>
> Regards,
>
> Rainer
>
>  On 28 January 2012 14:53, Rainer Jung <rainer.jung@kippdata.de
>> <mailto:rainer.jung@kippdata.**de <rainer.jung@kippdata.de>>> wrote:
>>
>>    On 25.01.2012 14:47, Desilets, Alain wrote:
>>
>>                    I use this syntax too, but I think it works for me
>>            only because of my
>>                    loading of a NON-STANDARD module, mod_define.
>>
>>            http://people.apache.org/~__**rjung/mod_define/mod_define.__**
>> html <http://people.apache.org/~__rjung/mod_define/mod_define.__html>
>>
>>            <http://people.apache.org/~**rjung/mod_define/mod_define.**
>> html <http://people.apache.org/~rjung/mod_define/mod_define.html>>
>>
>>
>>        It works for me and I don't have mod_define loaded.
>>
>>
>>    Using an environment variable with the ${MYVAR} syntax works without
>>    mod_define. If you want to define the value of the variable inside
>>    the httpd configuration files, you would need mod_define.
>>
>>    Major difference: environment variables can't be changed with
>>    "apachectl restart" or "apachectl graceful", because in both cases
>>    the httpd parent process keept running and all child processes are
>>    forked from it with an unchanged environment.
>>
>>    If you define the variables inside the configuration and use the
>>    additional module, any changes to the definitions will become active
>>    by "apachectl restart" and "apachectl graceful".
>>
>>    Starting with the forthcoming Apache 2.4 defining variable inside
>>    the httpd configuration will become a core feature.
>>
>>    Regards,
>>
>>    Rainer
>>
>
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-- 
Steve Swift
http://www.swiftys.org.uk

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