hi Brian, this is not really tomcat clustering, but more httpd load
balancing. Disable reuse is available on two modules, mod_jk and
mod_proxy, that is why you get hits for mod_jk as well when you google.
syntax is case sensitive, and yes, you would add it to the end of the
BalancerMember
Filip
Alston, Brian (US SSA) wrote:
Ok ... I feel like a moron but I cannot figure out how to use "disablereuse" option. When I google for examples on
"disablereuse", what I find is that in my httpd.conf file I need to add the line "JkOptions +DisableReuse".
However, reading the information here (http://httpd.apache.org/docs/2.2/mod/mod_proxy.html) it looks like I need to add
"disablereuse=On" to the end of the line "BalancerMember http://192.168.1.101:8080 loadfactor=1". I am
extremely new at this Tomcat clustering process, so any leniency and help will be very much appreciated.
Thanks
Have a great day.
________________________________________
From: Filip Hanik - Dev Lists [devli...@hanik.com]
Sent: Tuesday, March 10, 2009 1:22 PM
To: Tomcat Users List
Subject: Re: Need Hellp With Tomcat 6 / Apache 2.2 Cluster Problem
Alston, Brian (US SSA) wrote:
Filip
Thank you for your help. I made the changes like you suggested:
changed "stickysession-jsessionid" to
"stickysession=JSESSIONID|jsessionid"
I already had "stickysession=jsessionid" (it was a typo here in my post) but I added the
"pipe" and uppercase "JSESSIONID"
my "server.xml" already had the line you suggested.
If I use "disablereuse=On" won't I then have problems with my cookies
and sessions?
disable reuse will not affect your cookies or sessions
Filip
Again, thank you very much for your help.
________________________________________
From: Filip Hanik - Dev Lists [devli...@hanik.com]
Sent: Tuesday, March 10, 2009 12:42 PM
To: Tomcat Users List
Subject: Re: Need Hellp With Tomcat 6 / Apache 2.2 Cluster Problem
hi Brian,
your stickysession attribute is wrong, it should look like
|stickysession=JSESSIONID|jsessionid
then you must set jvmRoute in server.xml (<Engine name="xxx"
jvmRoute="tc1") the jvmRoute has to be unique across the tc nodes.
stickyness will only apply to request that have sessions
remove smax/max, better to use the defaults
I would also set the property disablereuse to On if it is supported in
your httpd version, right now it may try to use a connection that is
dead, and it seems its not trying another node, there may be some other
attributes that can help with that too
documentation is here
http://httpd.apache.org/docs/2.2/mod/mod_proxy.html
Filip
|Alston, Brian (US SSA) wrote:
Like the example in the book, I created a file called "proxy-balancer.conf" and put
it in the "conf.d" directory. Here is what the file looks like (I retyped it so there may
be mistakes):
<IfModule !proxy_module>
LoadModule proxy_module modules/mod_proxy.so
</IfModule>
# <IfModule !proxy_ajp_module>
# LoadModule proxy_ajp_module modules/mod_proxy_ajp.so
# </IfModule>
<IfModule !proxy_http_module>
LoadModule proxy_http_module modules/mod_proxy_http.so
</IfModule>
<IfModule !proxy_balancer_module>
LoadModule proxy_balancer_module modules/mod_proxy_balancer.so
</IfModule>
<IfModule !status_module>
LoadModule status_module modules/mod_status.so
</IfModule>
<IfModule !proxy_balancer_module>
ProxyRequests Off
<Proxy balancer://tccluster>
BalancerMember http://192.168.1.101:8080 loadfactor=1 max=150 smax=145
BalancerMember http://192.168.1.102:8080 loadfactor=1 max=150 smax=145
BalancerMember http://192.168.1.103:8080 loadfactor=1 max=150 smax=145
Order Deny,Allow
Allow from all
</Proxy>
<Location /balancer-manager>
SetHandler balancer-manager
Order Deny,Allow
Allow from all
</Location>
<Location /my-webapp>
ProxyPass balancer://tccluster/my-webapp stickysession-jsessionid
ProxyPassReverse balancer://tccluster/my-webapp
Order Deny,Allow
Allow from all
</Location>
<Location /examples>
ProxyPass balancer://tccluster/examples stickysession-jsessionid
ProxyPassReverse balancer://tccluster/examples
Order Deny,Allow
Allow from all
</Location>
</IfModule>
________________________________________
From: Filip Hanik - Dev Lists [devli...@hanik.com]
Sent: Tuesday, March 10, 2009 11:29 AM
To: Tomcat Users List
Subject: Re: Need Hellp With Tomcat 6 / Apache 2.2 Cluster Problem
what does the cluster section of your httpd look like?
Alston, Brian (US SSA) wrote:
I have one Apache http server version 2.2.3 (on Red Hat Enterprise Linux 5) and three Tomcat 6 version 6.0.18 servers
(on Windows Server 2003) running in my cluster. Everything "appears" to be working well. It looks like it is
using RoundRobin because every time I refresh the page it goes from web001 -> web002 -> web003 -> web001 ->
etc. I used some of the examples that are provided with Tomcat in the "examples" directory - specifically the
"Sessions" servlet and it looks like my sessions are staying the same and holding information. My issue is
this. When I stop one of the Tomcat servers (let's say web002), I will sometimes get the following error message when I
refresh the page:
- - - - - - - - - -
Proxy Error
The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request GET /examples/instance.html.
Reason: Error reading from remote server
Apache/2.2.3 (Red Hat) Server at 150.37.0.20 Port 80
- - - - - - - - - -
I don't receive this error message every single time I refresh the page but I
do get it often. It looks like Apache http server is still trying to access the
Tomcat server web002 even though it is down. Does this sound like I have an
incorrect configuration to anybody or is this normal? I would not think that it
was normal, as clustering is supposed to prevent errors like this.
I have been following the examples in the O'Reilly book "Tomcat: The Definitive Guide" in
chapter 10 - "Tomcat Clustering".
Any help anybody can provide will be greatly appreciated.
Thank you for reading, have a good day.
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