httpd-users mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From David Multer <da...@multer.com>
Subject Re: [users@httpd] httpd 2.2.10 mod_proxy bug?
Date Thu, 06 Nov 2008 16:27:54 GMT
The problem just started happening again after a day with absolutely  
no changes of any kind.

On Nov 5, 2008, at 5:46 PM, David Multer wrote:

> I've done some more testing of this problem, and here's some more  
> detail:
>
> - I re-installed 2.2.10 and the problem went away.
>
> - I tried switching to mod_proxy_ajp by changing the "http:" prefix  
> in the ProxyPass and ProxyPassReverse to "ajp:" After restarting  
> Apache, I started to get the DNS errors again. Reinstalling Apache  
> (sudo make install) fixed the problem.
>
> - Note that the DNS lookup for subdomain.domain.com is only  
> registered on my internal DNS (BIND9) server. This is because the  
> subdomains are meant only to be publicized behind my firewall.  
> Performing a "dig" for subdomain.domain.com works fine. And of  
> course I can get to Tomcat/Hudson just fine until the problem happens.
>
> - When in the error state, I get this DNS failure regardless of  
> whether Tomcat is running.
>
> - I've never seen this problem before even across many Apache/Tomcat  
> config file changes and restarts.
>
> - I had initially assumed the problem was introduced by the 2.2.10  
> change as it's the only difference and I noticed the changelog had a  
> number of mod_proxy changes.
>
> Questions:
>
> - Is Apache caching some proxy DNS requests?
> - I assume the error is purely inside Apache and mod_proxy right?
> - What could cause this error?
> - Why would an install clear up the problem?
>
> Thanks,
> David
>
> On Nov 4, 2008, at 10:30 PM, David Multer wrote:
>
>> I just installed the latest 2.2.10 version of Apache web server and  
>> noticed it's broken my Tomcat+Hudson setup. I've confirmed that  
>> falling back to 2.2.9 eliminates the problem. I suppose it could be  
>> an issue in my config that was only uncovered with the latest  
>> version, but for now I'll assume it's a real problem.
>>
>> My httpd.conf:
>> ...
>> LoadModule proxy_module modules/mod_proxy.so
>> ...
>> ProxyRequests off
>> ...
>> ProxyPass /hudson/ http://subdomain.domain.com:8080/hudson/
>> ProxyPassReverse /hudson/ http://subdomain.domain.com:8080/hudson/
>>
>> Using 2.2.10, when I navigate to http://subdomain.domain.com:8080/hudson/ 
>>  everything works fine. So Tomcat+Hudson is good. When I go to http://subdomain.domain.com/hudson/

>>  I get a 502 GET /hudson/ error reporting a DNS failure for  
>> subdomain.domain.com. Again, both approaches work fine under 2.2.9.
>>
>> Here's what shows up in my Apache error log:
>> [Tue Nov 04 16:04:55 2008] [error] [client X.X.X.X] proxy: DNS  
>> lookup failure for: subdomain.domain.com returned by /hudson/
>>
>> Thanks for any help. I wanted to ask before filing a bug report.
>>
>> -David
>>
>>
>> ---------------------------------------------------------------------
>> 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
>>
>
>
> ---------------------------------------------------------------------
> 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
>


---------------------------------------------------------------------
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


Mime
View raw message