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Posted to users@httpd.apache.org by Benjamin <be...@netyantra.com> on 2005/03/10 10:51:46 UTC
[users@httpd] conditonal listen???
Hello ppl,
I intend to run apache httpd, on a server, which creates an alias(when
it is up), on the default port 80.
When the server is down, I still want httpd to run but on a different
port. I can do that, again with the port/Listen directive.
My problem is the IP.
When the server is UP, I want apache to listen on the alias that i created.
But if the alias duznt exist, I want it to listen on INADDR_ANY.
I tried putting in both the IPs, viz, the alias and INADDR_ANY(in fact,
also tried an actual IP on the machine) in two Listen directives.
If the alias exists, apache duz start the httpd.
But if it duznt, it simply exits, giving a bind error:
Cannot assign requested address: make_sock: could not bind to address
<alias IP>.
Is there any way to tell apache to check the existence of the IP, if not
do something else.
Any ideas anyone?
--
Benjamin Jacob.
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Re: [users@httpd] conditonal listen???
Posted by Benjamin <be...@netyantra.com>.
Hey Joshua,
Thanx a ton.
It duz work, with that IfDefine test.
But I came across this problem, with Apache 2.
I could find no option to specify the User name and Group thru
configure, which was existent in Apache 1.3
Now, if i dont specify anything other than the PREFIX, I see a "nobody"
against the user and some strange value against the Group in httpd.conf.
Tried to look around, but couldnt find any help.
Thanx again.
Joshua Slive wrote:
>On Thu, 10 Mar 2005 15:21:46 +0530, Benjamin <be...@netyantra.com> wrote:
>
>
>>Is there any way to tell apache to check the existence of the IP, if not
>>do something else.
>>
>>
>
>Not that I know of. I would simply write a simple script that checked
>if the IP was available and started apache with, for example
>"apachectl -D IPAvailable". Then you can include in your config an
><IfDefine IPAvailable> section that will only be used in that case.
>
>Joshua.
>
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>
>
--
Benjamin Jacob.
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Re: [users@httpd] conditional listen???
Posted by Benjamin <be...@netyantra.com>.
oopps !!!
i sure was confused.
but somehow.. it did seem to work.. i wonder how.
If i specify the path of the script both in httpd.conf and with the -D
option.. it did work.
Neway.. thanx again for the help.
Joshua Slive wrote:
>On Tue, 15 Mar 2005 14:59:38 +0530, Benjamin <be...@netyantra.com> wrote:
>
>
>> Wot is the default directory into which this IfDefine directive will look
>>for the said script.
>>
>> I tried all combinations under /home/user/apache/ , /home/user/apache/conf,
>>/home/user/apache/bin/ or the directory from where I call httpd.
>> the directive inside httpd.conf looks somethign like this:
>> <IfDefine IPAvailable> Listen 12.34.56.89:80 </IfDefine> Unless i specify
>>the complete path in the IfDefine like : <IfDefine
>>/home/user/apache/IPavailable> Listen 12.34.56.89:80 </IfDefine> and also
>>along with the -D option for httpd ie. httpd -D
>>/home/user/apache/IPavailable it duz not seem to work. Shud the script be
>>under the ServerRoot , which is /home/user/apache/ for me.
>>
>>
>
>I think you are a little confused.
>
>You need to write a script that checks to see whether the IP address
>is available. Then at the end of this script, you start apache as
>follows (using pseudo-code):
>
>if the IP address is available
> apachectl -D IPavailable
>else
> apachectl
>end
>
>The <IfDefine IPavailable> block does not run a script. It simply
>checks to see whether a particular variable (IPavailable) was passed
>on the command line when apache was started. It is your
>responsibility to pass that variable conditional on the availability
>of the IP address.
>
>Joshua.
>
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>
>
>
--
Benjamin Jacob.
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Re: [users@httpd] conditional listen???
Posted by Joshua Slive <js...@gmail.com>.
On Tue, 15 Mar 2005 14:59:38 +0530, Benjamin <be...@netyantra.com> wrote:
> Wot is the default directory into which this IfDefine directive will look
> for the said script.
>
> I tried all combinations under /home/user/apache/ , /home/user/apache/conf,
> /home/user/apache/bin/ or the directory from where I call httpd.
> the directive inside httpd.conf looks somethign like this:
> <IfDefine IPAvailable> Listen 12.34.56.89:80 </IfDefine> Unless i specify
> the complete path in the IfDefine like : <IfDefine
> /home/user/apache/IPavailable> Listen 12.34.56.89:80 </IfDefine> and also
> along with the -D option for httpd ie. httpd -D
> /home/user/apache/IPavailable it duz not seem to work. Shud the script be
> under the ServerRoot , which is /home/user/apache/ for me.
I think you are a little confused.
You need to write a script that checks to see whether the IP address
is available. Then at the end of this script, you start apache as
follows (using pseudo-code):
if the IP address is available
apachectl -D IPavailable
else
apachectl
end
The <IfDefine IPavailable> block does not run a script. It simply
checks to see whether a particular variable (IPavailable) was passed
on the command line when apache was started. It is your
responsibility to pass that variable conditional on the availability
of the IP address.
Joshua.
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Re: [users@httpd] conditional listen???
Posted by Benjamin <be...@netyantra.com>.
Wot is the default directory into which this IfDefine directive will
look for the said script.
I tried all combinations under /home/user/apache/ ,
/home/user/apache/conf, /home/user/apache/bin/ or the directory from
where I call httpd.
the directive inside httpd.conf looks somethign like this:
<IfDefine IPAvailable>
Listen 12.34.56.89:80
</IfDefine>
Unless i specify the complete path in the IfDefine like :
<IfDefine /home/user/apache/IPavailable>
Listen 12.34.56.89:80
</IfDefine>
and also along with the -D option for httpd
ie. httpd -D /home/user/apache/IPavailable
it duz not seem to work.
Shud the script be under the ServerRoot , which is /home/user/apache/ for me.
Joshua Slive wrote:
>On Thu, 10 Mar 2005 15:21:46 +0530, Benjamin <be...@netyantra.com> wrote:
>
>
>>Is there any way to tell apache to check the existence of the IP, if not
>>do something else.
>>
>>
>
>Not that I know of. I would simply write a simple script that checked
>if the IP was available and started apache with, for example
>"apachectl -D IPAvailable". Then you can include in your config an
><IfDefine IPAvailable> section that will only be used in that case.
>
>Joshua.
>
>---------------------------------------------------------------------
>The official User-To-User support forum of the Apache HTTP Server Project.
>See <URL:http://httpd.apache.org/userslist.html> for more info.
>To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org
> " from the digest: users-digest-unsubscribe@httpd.apache.org
>For additional commands, e-mail: users-help@httpd.apache.org
>
>
>
--
Benjamin Jacob.
Disclaimer :
------------------------------------------------------------------------------
If you are not the intended recipient of this transmission to whom it is
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from your system. The sender does not accept liability for any errors or
omissions in the contents of this message which arise as a result of e-mail
transmission, which cannot be guaranteed to be secure or error-free as
information could be intercepted, corrupted, lost, destroyed, arrive late or
incomplete, arrive at wrong address or contain viruses. If verification
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------------------------------------------------------------------------------
Re: [users@httpd] conditonal listen???
Posted by Joshua Slive <js...@gmail.com>.
On Thu, 10 Mar 2005 15:21:46 +0530, Benjamin <be...@netyantra.com> wrote:
> Is there any way to tell apache to check the existence of the IP, if not
> do something else.
Not that I know of. I would simply write a simple script that checked
if the IP was available and started apache with, for example
"apachectl -D IPAvailable". Then you can include in your config an
<IfDefine IPAvailable> section that will only be used in that case.
Joshua.
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