On Monday, 13 August 2012 15:51:23 UTC+2, GADSDON Paul  wrote:
> Hi Folks
> 
> 
> 
> I was wondering if anyone could help with the configuration of kerberos in an 
> apache load balanced environment
> 
> 
> 
> We have an external apache http gateway in the DMZ and an Apache load 
> balancer in the Back Office.  The gateway is set up to proxypass requests for 
> an internal address to the http gateway in the DMZ. So if a user goes to 
> http://ourapacheserverinthedmz.com/us they will be proxypassed to our load 
> balancer using the gateways FQDM
> 
> 
> 
> This preserves the FQDN in the DMZ and masks the internal addresses of our 
> load balancer and two Apache web servers.
> 
> 
> 
> We have Kerberos working on one server, when the LB is shut down. To do this 
> we got our Windows techies to create a service principle for 
> http://webserver1.com and a corresponding keytab.
> 
> 
> 
> This works fine if we access the server directly via its own URL, i.e 
> http://webserver1.com, but how do we do this for two servers when the 
> originating URL is that of the Apache gateway, i.e 
> http://ourapacheserverinthedmz.com/us.
> 
> 
> 
> Do we create one keytab for http://ourapacheserverinthedmz.com/us and have 
> this added to the SPN“s for both apache web servers? Or do we simply have one 
> keytab created for http://ourapacheserverinthedmz.com/us and then have SPN 
> for our load balancer.
> 
> 
> 
> http gateway
> 
>                 |
> 
> Load balancer
> 
>                 |
> 
> -----------------------
> 
>     |                      |
> 
> WS1              WS2 ---------------|
> 
> KDC
> 
>     |-------------------------------|
> 
> 
> 
> Cheers
> 
> Albert
> 
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Hi Richard and thanks for your help.

Things have slightly changed insofar as we have a hack that keeps internal 
people internal.  So the proxy in the DMZ will not be used now for internal 
people.

So now what I have is an apache load balancer, with two apache web servers, 
both have Kerberos working alone.

Do I need to create keytabs for all three servers or just the two apache web 
servers?

Would this be correct

webserver1 Apache keytab: 
- HTTP/ourapacheloadbalancer.com@REALM 
- HTTP/webserver1.com@REALM 

webserver2 Apache keytab: 
- HTTP/ourapacheloadbalancer.com@REALM 
- HTTP/webserver2.com@REALM 

I will probably test it for now with just one webserver being servered by the 
load balancer
Many thanks for your help

Albert

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