Re: [users@httpd] Using environment variable in httpd.conf

[Tom Hoefakker <twh@xxxxxx>]

As far as I know, it's an undocumented "feature".  But, in my 
experience, it does actually work quite well.  While I vaguely recall a 
note on the development list questioning whether or not this should be 
removed, I would love to see this become a full-fledged documented 
feature as it is very useful in situations such as yours.

In your httpd.conf file you can use environment variables like this:
${varname}

In our environment, we use environment variables for quite a few things:
ServerRoot
Port
DocumentRoot
module paths - both bundled and custom modules
User & group  (different users in development vs. production)
path to piped log program
log file path
etc...

Hope this helps.
Tom



Khai Doan wrote:
> I am a mod_perl programmer, and I also manage my company web server.  We 
> are growing and constantly adding new features to our products.  I find 
> myself making change to the httpd.conf very frequent.  Sometimes, I 
> change httpd.conf on the development server, and later forget to apply 
> the change to httpd.conf on staging server, and production servers.  I 
> wish to have the httpd.conf in my company cvs repository and get pushed 
> out along with the rest of the application code.  Unfortunately quite a 
> few things in httpd.conf stand in the way, such as hardcoded paths, and 
> port numbers.  (We are in an environment where all developers have to 
> develop on one development server, and each developer is assigned a port 
> number, and run a separate apache process listening on that port.)  I 
> also want other developers to be able to check in changes to the 
> httpd.conf file. 
>  
> If I set up environment variables to hold these hardcoded paths, and 
> port numbers, can I use these environment variables in httpd.conf? 
>  
> If I am to write a module in C to handle this, where can I start?  What 
> book do you recommend?
>  
> Khai
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