RE: Rookie Question on Define and Testing the value

[Darryl Philip Baker <darryl.baker@xxxxxxxxxxxxxxxx>]

Rick said:

I currently specify the variables I want to check as flags from whatever logic I want external to the httpd binary, then test for the existence of the appropriate flag using IfDefine.  For example, I replaced apachectl with a custom version that can determine which datacenter I'm running in and adds the appropriate -D definitions to the httpd startup, etc.

 

I'm planning on doing a similar thing but using a file I will include that has the unique defines per host. I wanted to do some of the custom defines based on the data center of the host rather than creating more host unique variables. Ce la vie.

 

 

Darryl Baker

Sr. System Administrator

Distributed Application Platform Services (DAPS)

Project Management Office and Enabling Technologies (PMOET)

Northwestern | Information Technology (Formerly NUIT)

1800 Sherman Ave., Suite 600

Evanston, IL  60201-3715

(847) 467-6674

www.it.northwestern.edu

-----Original Message-----

 

 

> -----Original Message-----

> From: Eric Covener [mailto:covener@xxxxxxxxx]

> Sent: Tuesday, May 31, 2016 15:38

> To: users@xxxxxxxxxxxxxxxx

> Subject: Re: [users@httpd] Rookie Question on Define and Testing the

> value

>

> On Tue, May 31, 2016 at 3:32 PM, Darryl Philip Baker

> <darryl.baker@xxxxxxxxxxxxxxxx> wrote:

> > I’m trying to do some conditional configuration settings. I know

> > that I can use “Define variable value” to set up a variable. I know

> > that “<IfDefine [!}variable>” can be used to test to see if a

> > variable is set or not. I looked at “<If _expression_>” as a

> > possibility but since what I am setting are really configuration

> > change and “If” is a runtime directive. Using “If” is going to add

> > runtime overhead for something that will not change for the life of

> > the daemon. Is there initialization directive to use to see if a

> > variable set using “Define” matches a particular value and what is that directive if it exists?

>

> I don't think you can test against their values in something like

> <IfDefine -- you can only currently do a boolean <ifDefine> and inside

> get at the value with ${VAR}.

>

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