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Posted to users@tomcat.apache.org by Brian Barnett <br...@calcxml.com> on 2007/08/24 03:39:11 UTC
Need a way to identify tomcat instances at run-time
I have a struts-based application running on multiple tomcat instances, load balanced by a hardware load balancer, i.e., no Apache Web Server. I need a way at run-time to know which tomcat instance it is. Is there a way to access info in the server.xml or context.xml file at run-time? Can I specify some arbitrary value in either of those xml files that would be available at run-time? Is there some other way to identify the tomcat instance at run-time? Is there a way to access CATALINA_HOME or CATALINA_BASE at run-time?
Any ideas would be appreciated.
Thanks,
Brian Barnett
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RE: Need a way to identify tomcat instances at run-time
Posted by Brian Barnett <br...@calcxml.com>.
Chris,
I don't know what you mean by your response.
-----Original Message-----
From: Christopher Schultz [mailto:chris@christopherschultz.net]
Sent: Friday, August 24, 2007 6:43 AM
To: Tomcat Users List
Subject: Re: Need a way to identify tomcat instances at run-time
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Hash: SHA1
Brian,
Don't hijack threads. Please post a new question to the list.
- -chris
Brian Barnett wrote:
> I have a struts-based application running on multiple tomcat instances, load balanced by a hardware load balancer, i.e., no Apache Web Server. I need a way at run-time to know which tomcat instance it is. Is there a way to access info in the server.xml or context.xml file at run-time? Can I specify some arbitrary value in either of those xml files that would be available at run-time? Is there some other way to identify the tomcat instance at run-time? Is there a way to access CATALINA_HOME or CATALINA_BASE at run-time?
>
> Any ideas would be appreciated.
>
> Thanks,
> Brian Barnett
>
>
>
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Re: Need a way to identify tomcat instances at run-time
Posted by Christopher Schultz <ch...@christopherschultz.net>.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Brian,
Don't hijack threads. Please post a new question to the list.
- -chris
Brian Barnett wrote:
> I have a struts-based application running on multiple tomcat instances, load balanced by a hardware load balancer, i.e., no Apache Web Server. I need a way at run-time to know which tomcat instance it is. Is there a way to access info in the server.xml or context.xml file at run-time? Can I specify some arbitrary value in either of those xml files that would be available at run-time? Is there some other way to identify the tomcat instance at run-time? Is there a way to access CATALINA_HOME or CATALINA_BASE at run-time?
>
> Any ideas would be appreciated.
>
> Thanks,
> Brian Barnett
>
>
>
> ---------------------------------------------------------------------
> To start a new topic, e-mail: users@tomcat.apache.org
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
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=3Ack
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Re: java.net.SocketException: Invalid argument
Posted by Christopher Schultz <ch...@christopherschultz.net>.
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Aaron,
Don't hijack threads. Please post a new question to the list.
- -chris
Aaron wrote:
> I am running Tomcat 5.0.28 and Apache 2.2 using mod_jk. I am constantly seeing the following error show up in the catalina.log:
>
> WARNING: Exception executing accept
> java.net.SocketException: Invalid argument
> at java.net.PlainSocketImpl.socketSetOption(Native Method)
> at java.net.PlainSocketImpl.setOption(PlainSocketImpl.java:240)
> at java.net.Socket.setSoLinger(Socket.java:826)
> at org.apache.jk.common.ChannelSocket.accept(ChannelSocket.java:300)
> at org.apache.jk.common.ChannelSocket.acceptConnections(ChannelSocket.java:638)
> at org.apache.jk.common.SocketAcceptor.runIt(ChannelSocket.java:847)
> at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
> at java.lang.Thread.run(Thread.java:534)
>
> Is this something that I should be concerned with? I don't see any glaring performance issues with my site, but I still don't like the fact that my logs are filling up with errors. Thanks for your help and input.
>
> Aaron Steele
> Technology Manager
>
> Natural Wellness USA, Inc.
> http://www.veria.com
> 701 Highlander Blvd, Suite 200 | Arlington, Texas 76015
> p (817) 804-4646 | c (817) 879-7528 | f (817) 804-4696
>
>
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java.net.SocketException: Invalid argument
Posted by Aaron <aa...@veria.com>.
I am running Tomcat 5.0.28 and Apache 2.2 using mod_jk. I am constantly seeing the following error show up in the catalina.log:
WARNING: Exception executing accept
java.net.SocketException: Invalid argument
at java.net.PlainSocketImpl.socketSetOption(Native Method)
at java.net.PlainSocketImpl.setOption(PlainSocketImpl.java:240)
at java.net.Socket.setSoLinger(Socket.java:826)
at org.apache.jk.common.ChannelSocket.accept(ChannelSocket.java:300)
at org.apache.jk.common.ChannelSocket.acceptConnections(ChannelSocket.java:638)
at org.apache.jk.common.SocketAcceptor.runIt(ChannelSocket.java:847)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
at java.lang.Thread.run(Thread.java:534)
Is this something that I should be concerned with? I don't see any glaring performance issues with my site, but I still don't like the fact that my logs are filling up with errors. Thanks for your help and input.
Aaron Steele
Technology Manager
Natural Wellness USA, Inc.
http://www.veria.com
701 Highlander Blvd, Suite 200 | Arlington, Texas 76015
p (817) 804-4646 | c (817) 879-7528 | f (817) 804-4696
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Re: Need a way to identify tomcat instances at run-time
Posted by DJ...@desknetinc.com.
There may be better ways, but one approach which occurs to me is to set
unique jvmRoute values on the engines in the server.xml. Even though you
aren't using mod_jk, this will result in the provided values being
appended to the sessionid. Assuming that you are establishing sessions,
and that your hardware balancer has sticky session logic, so once a
session is established, the user's subsequent requests get sent to the
same backend, this would allow you to distinguish which tomcat instance is
being used when processing a request for a user. This would be apparent
within your webapp by examining the sessionid, but also from the client
side, by examining the jsessionid cookie value.
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Subject: Need a way to identify tomcat instances at run-time
I have a struts-based application running on multiple tomcat instances,
load balanced by a hardware load balancer, i.e., no Apache Web Server. I
need a way at run-time to know which tomcat instance it is. Is there a way
to access info in the server.xml or context.xml file at run-time? Can I
specify some arbitrary value in either of those xml files that would be
available at run-time? Is there some other way to identify the tomcat
instance at run-time? Is there a way to access CATALINA_HOME or
CATALINA_BASE at run-time?
Any ideas would be appreciated.
Thanks,
Brian Barnett
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