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Posted to users@tomcat.apache.org by "Alston, Brian (US SSA)" <br...@baesystems.com> on 2009/03/10 13:21:06 UTC
Need Hellp With Tomcat 6 / Apache 2.2 Cluster Problem
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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Re: Need Hellp With Tomcat 6 / Apache 2.2 Cluster Problem
Posted by Rainer Jung <ra...@kippdata.de>.
On 11.03.2009 16:28, Alston, Brian (US SSA) wrote:
> Filip
>
> I was under the assumption, from my reading, that "load balancing" was a component of "clustering". At least that's how the O'Reilly book makes me feel.
>
> I added the option to the end of the line and it now looks like this:
>
> BalancerMember http://192.168.1.101:8080 loadfactor=1 disablereuse=On
> BalancerMember http://192.168.1.102:8080 loadfactor=1 disablereuse=On
> BalancerMember http://192.168.1.103:8080 loadfactor=1 disablereuse=On
>
> I restarted Apache and got the following error:
>
> - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> Starting httpd: Syntax error on line 25 of /etc/httpd/conf.d/proxy-balancer.conf:
> BalancerMember unknown Worker parameter
> - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Attribute "disablereuse" has been added in httpd 2.2.9. When using
mod_proxy_balancer or mod_proxy_ajp you should use the most recent
version of httpd (at the moment 2.2.11), because those modules are still
developing faster than most other, older modules.
Regards,
Rainer
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RE: Need Hellp With Tomcat 6 / Apache 2.2 Cluster Problem
Posted by "Alston, Brian (US SSA)" <br...@baesystems.com>.
Filip
I was under the assumption, from my reading, that "load balancing" was a component of "clustering". At least that's how the O'Reilly book makes me feel.
I added the option to the end of the line and it now looks like this:
BalancerMember http://192.168.1.101:8080 loadfactor=1 disablereuse=On
BalancerMember http://192.168.1.102:8080 loadfactor=1 disablereuse=On
BalancerMember http://192.168.1.103:8080 loadfactor=1 disablereuse=On
I restarted Apache and got the following error:
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Starting httpd: Syntax error on line 25 of /etc/httpd/conf.d/proxy-balancer.conf:
BalancerMember unknown Worker parameter
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Thank you
________________________________________
From: Filip Hanik - Dev Lists [devlists@hanik.com]
Sent: Wednesday, March 11, 2009 11:10 AM
To: Tomcat Users List
Subject: Re: Need Hellp With Tomcat 6 / Apache 2.2 Cluster Problem
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 [devlists@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 [devlists@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 [devlists@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.
>>>> ---------------------------------------------------------------------
>>>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>>>> For additional commands, e-mail: users-help@tomcat.apache.org
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>> ---------------------------------------------------------------------
>>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>>> For additional commands, e-mail: users-help@tomcat.apache.org
>>>
>>>
>>> ---------------------------------------------------------------------
>>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>>> For additional commands, e-mail: users-help@tomcat.apache.org
>>>
>>>
>>>
>>>
>>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>> For additional commands, e-mail: users-help@tomcat.apache.org
>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>> For additional commands, e-mail: users-help@tomcat.apache.org
>>
>>
>>
>>
>
>
> ---------------------------------------------------------------------
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>
>
> ---------------------------------------------------------------------
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>
>
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Re: Need Hellp With Tomcat 6 / Apache 2.2 Cluster Problem
Posted by Filip Hanik - Dev Lists <de...@hanik.com>.
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 [devlists@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 [devlists@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 [devlists@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.
>>>> ---------------------------------------------------------------------
>>>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>>>> For additional commands, e-mail: users-help@tomcat.apache.org
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>> ---------------------------------------------------------------------
>>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>>> For additional commands, e-mail: users-help@tomcat.apache.org
>>>
>>>
>>> ---------------------------------------------------------------------
>>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>>> For additional commands, e-mail: users-help@tomcat.apache.org
>>>
>>>
>>>
>>>
>>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>> For additional commands, e-mail: users-help@tomcat.apache.org
>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>> For additional commands, e-mail: users-help@tomcat.apache.org
>>
>>
>>
>>
>
>
> ---------------------------------------------------------------------
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>
>
> ---------------------------------------------------------------------
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RE: Need Hellp With Tomcat 6 / Apache 2.2 Cluster Problem
Posted by "Alston, Brian (US SSA)" <br...@baesystems.com>.
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 [devlists@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 [devlists@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 [devlists@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.
>>> ---------------------------------------------------------------------
>>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>>> For additional commands, e-mail: users-help@tomcat.apache.org
>>>
>>>
>>>
>>>
>>>
>> ---------------------------------------------------------------------
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>>
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>>
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Re: Need Hellp With Tomcat 6 / Apache 2.2 Cluster Problem
Posted by Filip Hanik - Dev Lists <de...@hanik.com>.
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 [devlists@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 [devlists@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.
>>> ---------------------------------------------------------------------
>>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>>> For additional commands, e-mail: users-help@tomcat.apache.org
>>>
>>>
>>>
>>>
>>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>> For additional commands, e-mail: users-help@tomcat.apache.org
>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>> For additional commands, e-mail: users-help@tomcat.apache.org
>>
>>
>>
>>
>
>
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>
>
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RE: Need Hellp With Tomcat 6 / Apache 2.2 Cluster Problem
Posted by "Alston, Brian (US SSA)" <br...@baesystems.com>.
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?
Again, thank you very much for your help.
________________________________________
From: Filip Hanik - Dev Lists [devlists@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 [devlists@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.
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>> For additional commands, e-mail: users-help@tomcat.apache.org
>>
>>
>>
>>
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
>
> ---------------------------------------------------------------------
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> For additional commands, e-mail: users-help@tomcat.apache.org
>
>
>
---------------------------------------------------------------------
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---------------------------------------------------------------------
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Re: Need Hellp With Tomcat 6 / Apache 2.2 Cluster Problem
Posted by Filip Hanik - Dev Lists <de...@hanik.com>.
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 [devlists@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.
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>> For additional commands, e-mail: users-help@tomcat.apache.org
>>
>>
>>
>>
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
>
>
---------------------------------------------------------------------
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RE: Need Hellp With Tomcat 6 / Apache 2.2 Cluster Problem
Posted by "Alston, Brian (US SSA)" <br...@baesystems.com>.
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 [devlists@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.
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
>
>
---------------------------------------------------------------------
To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
For additional commands, e-mail: users-help@tomcat.apache.org
---------------------------------------------------------------------
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For additional commands, e-mail: users-help@tomcat.apache.org
Re: Need Hellp With Tomcat 6 / Apache 2.2 Cluster Problem
Posted by Filip Hanik - Dev Lists <de...@hanik.com>.
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.
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
>
>
---------------------------------------------------------------------
To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
For additional commands, e-mail: users-help@tomcat.apache.org