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Posted to users@tomcat.apache.org by Edwin Walsh <ed...@esat.kuleuven.be> on 2008/01/14 15:37:36 UTC
strange forwarding problem with jkmount
Hi,
I have the most peculiar problem (at least in my point of view) with
forwarding with jkmount. JkMount has always worked on my server, but
suddenly, without changing anything but the mod_jk settings (adding a
new jkmount and some rewriterules), JkMount suddenly only works if I
connect to my server from localhost and not from any other location.
I can't post the entire configuration of the server here, only the
section of mod_jk which you can find below.
Is there anybody that could give me a hint on where I might start
looking for the problem? What I suspect myself is that there might be
some virtualhost or directory that eats the incoming external request so
that I never get to the mod_jk section. And that it doesn't do this when
I connect from localhost. But it beats me why it would do that.
The error that I get from the apache logs is :
[Mon Jan 14 15:30:06 2008] [error] [client 10.33.132.252] File does not
exist: /volume1/www/htdocs/esat/jsp-examples
which makes me thing that the section in the configuration that is
'eating' my requests has a document base of /volume1/www/htdocs/esat/,
but I am not sure if that is a right presumption.
Greetings,
Edwin
<IfModule jk_module>
JkWorkersFile conf/extra/workers.properties
JkLogFile /volume1/www/logs/mod_jk.log
JkLogLevel info
JkLogStampFormat "[%a %d %b %Y %H:%M:%S] "
JkShmFile /volume1/www/logs/mod_jk-runtime-status
JkMount /jsp-examples/* tomcat
RewriteEngine On
JkMount /bench_* cartagen
</IfModule>
<Location /jkmanager/>
JkMount jkstatus
Order deny,allow
Deny from all
Allow from 127.0.0.1
</Location>
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Re: strange forwarding problem with jkmount
Posted by Edwin Walsh <ed...@esat.kuleuven.be>.
Hi,
It was as I expected and a virtual server was 'eating' my requests. The
JkMount was actually already set up in the global server, but by adding
the line JkMountCopy All it got forwarded to all the virtualhosts as
well. Since this is only a temporary problem for us, it will have to do...
Greetings
Edwin
Rainer Jung wrote:
> Hi Edwin,
>
> Edwin Walsh wrote:
>> Hi,
>>
>> I have the most peculiar problem (at least in my point of view) with
>> forwarding with jkmount. JkMount has always worked on my server, but
>> suddenly, without changing anything but the mod_jk settings (adding a
>> new jkmount and some rewriterules), JkMount suddenly only works if I
>> connect to my server from localhost and not from any other location.
>> I can't post the entire configuration of the server here, only the
>> section of mod_jk which you can find below.
>>
>> Is there anybody that could give me a hint on where I might start
>> looking for the problem? What I suspect myself is that there might be
>> some virtualhost or directory that eats the incoming external request
>> so that I never get to the mod_jk section. And that it doesn't do
>> this when I connect from localhost. But it beats me why it would do
>> that.
>
> I actually didn't read your config, but the description reminds me of
> a problem I had to analyze a few weeks ago. Customer had a SuSE linux
> system, which included an entry into /etc/hosts like
>
> 127.0.0.2 myserver
>
> and myserver was the name of the machine.
>
> Now if you configure a virtual host myserver:80 in your httpd
> configuration, what will happen?
>
> When httpd starts, it will resolve myserver, and by the usual
> configuration, /etc/hosts will come first and resolve into 127.0.0.2.
> So requests will be mapped to this vhost, if they actually talk to
> 127.0.0.2.
>
> Clients connection from local to myserver:80 will also resolve the
> name into 127.0.0.2, and thus the request will be successfully mapped
> by httpd to the vhost.
>
> Clients connecting from remote, will find myserver in DNS etc. and
> resolve the official address. Even if httpd listens to it, it will not
> associate the request with the myserver vhost.
>
> Check your /etc/hosts, if there is a nonsense entry for the name of
> your server in there. Also check your /etc/nsswitch.conf (assuming
> it's *nix), and go through those name services, checking for your
> server entries in them.
>
> If you are not allowed to control/fix those name services, you can put
> the JkMount into the global server and JkMountCopy On into each vhost,
> which is suspect to catch the request. That might not be what you
> want, though.
>
> Regards,
>
> Rainer
>
> P.S.: If you want to debug, which virtual server (or even the global
> server) catches a request, configure a different access log for each
> vhost and the global server. That way you can easily find out, which
> vhost handles your request.
>
>>
>> The error that I get from the apache logs is :
>> [Mon Jan 14 15:30:06 2008] [error] [client 10.33.132.252] File does
>> not exist: /volume1/www/htdocs/esat/jsp-examples
>> which makes me thing that the section in the configuration that is
>> 'eating' my requests has a document base of
>> /volume1/www/htdocs/esat/, but I am not sure if that is a right
>> presumption.
>>
>> Greetings,
>> Edwin
>>
>> <IfModule jk_module>
>> JkWorkersFile conf/extra/workers.properties
>> JkLogFile /volume1/www/logs/mod_jk.log
>> JkLogLevel info
>> JkLogStampFormat "[%a %d %b %Y %H:%M:%S] "
>> JkShmFile /volume1/www/logs/mod_jk-runtime-status
>> JkMount /jsp-examples/* tomcat
>>
>> RewriteEngine On
>> JkMount /bench_* cartagen
>> </IfModule>
>>
>> <Location /jkmanager/>
>> JkMount jkstatus
>> Order deny,allow
>> Deny from all
>> Allow from 127.0.0.1
>> </Location>
>
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Re: strange forwarding problem with jkmount
Posted by Rainer Jung <ra...@kippdata.de>.
Hi Edwin,
Edwin Walsh wrote:
> Hi,
>
> I have the most peculiar problem (at least in my point of view) with
> forwarding with jkmount. JkMount has always worked on my server, but
> suddenly, without changing anything but the mod_jk settings (adding a
> new jkmount and some rewriterules), JkMount suddenly only works if I
> connect to my server from localhost and not from any other location.
> I can't post the entire configuration of the server here, only the
> section of mod_jk which you can find below.
>
> Is there anybody that could give me a hint on where I might start
> looking for the problem? What I suspect myself is that there might be
> some virtualhost or directory that eats the incoming external request so
> that I never get to the mod_jk section. And that it doesn't do this when
> I connect from localhost. But it beats me why it would do that.
I actually didn't read your config, but the description reminds me of a
problem I had to analyze a few weeks ago. Customer had a SuSE linux
system, which included an entry into /etc/hosts like
127.0.0.2 myserver
and myserver was the name of the machine.
Now if you configure a virtual host myserver:80 in your httpd
configuration, what will happen?
When httpd starts, it will resolve myserver, and by the usual
configuration, /etc/hosts will come first and resolve into 127.0.0.2. So
requests will be mapped to this vhost, if they actually talk to 127.0.0.2.
Clients connection from local to myserver:80 will also resolve the name
into 127.0.0.2, and thus the request will be successfully mapped by
httpd to the vhost.
Clients connecting from remote, will find myserver in DNS etc. and
resolve the official address. Even if httpd listens to it, it will not
associate the request with the myserver vhost.
Check your /etc/hosts, if there is a nonsense entry for the name of your
server in there. Also check your /etc/nsswitch.conf (assuming it's
*nix), and go through those name services, checking for your server
entries in them.
If you are not allowed to control/fix those name services, you can put
the JkMount into the global server and JkMountCopy On into each vhost,
which is suspect to catch the request. That might not be what you want,
though.
Regards,
Rainer
P.S.: If you want to debug, which virtual server (or even the global
server) catches a request, configure a different access log for each
vhost and the global server. That way you can easily find out, which
vhost handles your request.
>
> The error that I get from the apache logs is :
> [Mon Jan 14 15:30:06 2008] [error] [client 10.33.132.252] File does not
> exist: /volume1/www/htdocs/esat/jsp-examples
> which makes me thing that the section in the configuration that is
> 'eating' my requests has a document base of /volume1/www/htdocs/esat/,
> but I am not sure if that is a right presumption.
>
> Greetings,
> Edwin
>
> <IfModule jk_module>
> JkWorkersFile conf/extra/workers.properties
> JkLogFile /volume1/www/logs/mod_jk.log
> JkLogLevel info
> JkLogStampFormat "[%a %d %b %Y %H:%M:%S] "
> JkShmFile /volume1/www/logs/mod_jk-runtime-status
> JkMount /jsp-examples/* tomcat
>
> RewriteEngine On
> JkMount /bench_* cartagen
> </IfModule>
>
> <Location /jkmanager/>
> JkMount jkstatus
> Order deny,allow
> Deny from all
> Allow from 127.0.0.1
> </Location>
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