[users@httpd] Setting Directive ServerName in VirtualHost to the full qualified domain of the request

[Jakob M <ja...@googlemail.com.INVALID>]

Hello together,

I need a little bit help setting up my apache to support a dynamic
ServerName.

Use-Case:
I have a DNS server which forwards all requests *.server.de to my apache.
This leads to these 3 example domains (In fact we talk about 600-800
Subdomains):

- subomain1.server.de
- subomain2.server.de
- subomain3.server.de

What I want to achiev is to only configure one VirtualHost but set the
ServerName on each request based on the subdomain which was used to access
the apache.

Therefore I thought I could use variables to pass them to the directive.
Unfortunately the variable is not resolved in my configuration.

Is there any way to pass an env variable to the directive ServerName, so I
can achiev the dynamic setup of ServerName based on the subdomain used?

Example Config:

<VirtualHost *:80>
UseCanonicalName Off
ProxyPreserveHost On
RewriteEngine on
ProxyRequests Off

SetEnvIf Host "^([^.]*).server.de$" SUBDOMAIN=$1
SetEnvIf Host "^([^.]*)-([^.]*).server.de$" HOSTNAME=$1
SetEnvIf Host "^([^.]*)-([^.]*) .server.de$" PORTNUMBER=:$2

ProxyPassInterpolateEnv On
ProxyPass        "/"  "http://${HOSTNAME}${PORTNUMBER}/" interpolate
ProxyPassReverse "/"  "http://${HOSTNAME}${PORTNUMBER}/" interpolate

ServerName %{SUBDOMAIN}e.server.de
</VirtualHost *:80>

Problem: The ServerName is now " %{SUBDOMAIN}e.server.de " -> The variable
gets not resolved.

Kind regards,
Jakob

Re: [users@httpd] Setting Directive ServerName in VirtualHost to the full qualified domain of the request

["Gillis J. de Nijs" <gi...@jink.net.INVALID>]

The ServerName doesn't matter, since it's not used in the ProxyPass.  Just
make that server.de or whatever.  Then create a ServerAlias *.server.de.
Keep in mind that this setup allows something like a request to
localhost-80.server.de which then gets proxied to localhost:80 and might
serve things that were supposed to only be accessed locally.  I'm not sure
why you want to proxy.  Is this something that could be solved using
mod_vhost_alias ?

On Thu, Feb 28, 2019 at 1:04 AM Jakob M
<ja...@googlemail.com.invalid> wrote:

> Hello together,
>
> I need a little bit help setting up my apache to support a dynamic
> ServerName.
>
> Use-Case:
> I have a DNS server which forwards all requests *.server.de to my apache.
> This leads to these 3 example domains (In fact we talk about 600-800
> Subdomains):
>
> - subomain1.server.de
> - subomain2.server.de
> - subomain3.server.de
>
> What I want to achiev is to only configure one VirtualHost but set the
> ServerName on each request based on the subdomain which was used to access
> the apache.
>
> Therefore I thought I could use variables to pass them to the directive.
> Unfortunately the variable is not resolved in my configuration.
>
> Is there any way to pass an env variable to the directive ServerName, so I
> can achiev the dynamic setup of ServerName based on the subdomain used?
>
> Example Config:
>
> <VirtualHost *:80>
> UseCanonicalName Off
> ProxyPreserveHost On
> RewriteEngine on
> ProxyRequests Off
>
> SetEnvIf Host "^([^.]*).server.de$" SUBDOMAIN=$1
> SetEnvIf Host "^([^.]*)-([^.]*).server.de$" HOSTNAME=$1
> SetEnvIf Host "^([^.]*)-([^.]*) .server.de$" PORTNUMBER=:$2
>
> ProxyPassInterpolateEnv On
> ProxyPass        "/"  "http://${HOSTNAME}${PORTNUMBER}/" interpolate
> ProxyPassReverse "/"  "http://${HOSTNAME}${PORTNUMBER}/" interpolate
>
> ServerName %{SUBDOMAIN}e.server.de
> </VirtualHost *:80>
>
> Problem: The ServerName is now " %{SUBDOMAIN}e.server.de " -> The
> variable gets not resolved.
>
> Kind regards,
> Jakob
>