ObjectWeb Consortium
Search ObjectWeb Mail Archive: 

Advanced Search - Powered by Google


Mail Archive Home | enhydra List | December 2005 Index

<--  Date Index  --> <--  Thread Index  -->

Re: [enhydra] FW: Load balancing Enhydra6.5 via apache


Hi,

You should try with setting the domain name (or IP number) for 'localhost' machine!

Instead this:
<Application prefix="/GolfShop">
<AppServer host="localhost"/>
<AppServer host="test02"/>
</Application>

Use this:
<Application prefix="/GolfShop">
<AppServer host="test01"/>
<AppServer host="test02"/>
</Application>

Hope this helps!

BTW, Enhydra Director has its own mailing list (director@xxxxxxxxxxxxx) :)

Regards,
 Slobodan Vujasinovic
Enhydra Development Team



Majid A. Latif wrote:

Hello

I seem to have encountered a stumbling block with Enhydra Director I hope you are able to help me.

I have apache running on one machine and also an instance of Enhydra server 6.5 and Enhydra Director 6.5 on the same machine which is running the GolfShop example.

On my second remote machine I have Enhydra server and Director running with another GolfShop application running.

Im trying to see the load balancing in action and I have seen it in action using the calculator example, but with this it doesn’t seem to want to load balance. When I go to http://locahost/GolfShop it always, and I mean ALWAYS, goes to the remote instance of the GolfShop application.

How do I know this? Because I have repainted some of the images on each GolfShop instance to differentiate between the two.

I have even added some weighting to the enhydra configuration file within apache but it has no affect.

The only time it runs the local instance of the GolfShop is when I close down the Enhydra server on the remote machine so it is forced to use the second instance.

My main aim of this testing is to eventually incorporate Enhydra Director in to our current jetty-based VPN application with apache as the front-end which is why I am not using jOnAS.

Any help to get this balancing would be greatly appreciated and before you say it, I too am certain I am doing something very silly which is causing this problem.

I attach a copy of my apache/enhydra_director.conf file and the Enhydra6.5/multiserver/conf/server.xml, if you require anything else please let me know.

Thanks in advance*

*

**********************************************************************************
This email and any files transmitted with it are confidential, and may be subject to legal privilege, and are intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error or think you may have done so, you may not peruse, use, disseminate, distribute or copy this message. Please notify the sender immediately and delete the original e-mail from your system.
**********************************************************************************

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

<!-- Example Server Configuration File -->
<!-- Note that component elements are nested corresponding to their
    parent-child relationships with each other -->

<!-- A "Server" is a singleton element that represents the entire JVM,
    which may contain one or more "Service" instances.  The Server
    listens for a shutdown command on the indicated port.

    Note:  A "Server" is not itself a "Container", so you may not
    define subcomponents such as "Valves" or "Loggers" at this level.
-->

<Server port="8005" shutdown="SHUTDOWN">

<!-- Comment these entries out to disable JMX MBeans support used for the administration web application -->
 <Listener className="org.apache.catalina.mbeans.ServerLifecycleListener" />
 <Listener 
className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener" />
 <Listener 
className="org.apache.catalina.storeconfig.StoreConfigLifecycleListener"/>

 <Listener className="org.enhydra.listener.AdaptorListener" 
propertiesFile="conf/adaptor.properties" />

 <!-- Global JNDI resources -->
 <GlobalNamingResources>

   <!-- Test entry for demonstration purposes -->
   <Environment name="simpleValue" type="java.lang.Integer" value="30"/>

   <!-- Editable user database that can also be used by
        UserDatabaseRealm to authenticate users -->
   <Resource name="UserDatabase" auth="Container"
             type="org.apache.catalina.UserDatabase"
      description="User database that can be updated and saved"
          factory="org.apache.catalina.users.MemoryUserDatabaseFactory"
         pathname="conf/tomcat-users.xml" />

 </GlobalNamingResources>

 <!-- A "Service" is a collection of one or more "Connectors" that share
      a single "Container" (and therefore the web applications visible
      within that Container).  Normally, that Container is an "Engine",
      but this is not required.

      Note:  A "Service" is not itself a "Container", so you may not
      define subcomponents such as "Valves" or "Loggers" at this level.
  -->

 <!-- Define the Tomcat Stand-Alone Service -->
 <Service name="Catalina">

   <!-- A "Connector" represents an endpoint by which requests are received
        and responses are returned.  Each Connector passes requests on to the
        associated "Container" (normally an Engine) for processing.

        By default, a non-SSL HTTP/1.1 Connector is established on port 8080.
        You can also enable an SSL HTTP/1.1 Connector on port 8443 by
        following the instructions below and uncommenting the second Connector
        entry.  SSL support requires the following steps (see the SSL Config
        HOWTO in the Tomcat 5 documentation bundle for more detailed
        instructions):
        * If your JDK version 1.3 or prior, download and install JSSE 1.0.2 or
          later, and put the JAR files into "$JAVA_HOME/jre/lib/ext".
        * Execute:
            %JAVA_HOME%/bin/keytool -genkey -alias tomcat -keyalg RSA 
(Windows)
            $JAVA_HOME/bin/keytool -genkey -alias tomcat -keyalg RSA  (Unix)
          with a password value of "changeit" for both the certificate and
          the keystore itself.

        By default, DNS lookups are enabled when a web application calls
        request.getRemoteHost().  This can have an adverse impact on
        performance, so you can disable it by setting the
        "enableLookups" attribute to "false".  When DNS lookups are disabled,
        request.getRemoteHost() will return the String version of the
        IP address of the remote client.
   -->

   <!-- Define a non-SSL HTTP/1.1 Connector on port 8080 -->
   <Connector port="8080" maxHttpHeaderSize="8192"
              maxThreads="150" minSpareThreads="25" maxSpareThreads="75"
              enableLookups="false" redirectPort="8443" acceptCount="100"
              connectionTimeout="20000" disableUploadTimeout="true" 
useBodyEncodingForURI="true" />
   <!-- Note : To disable connection timeouts, set connectionTimeout value
    to 0 -->
        
        <!-- Note : To use gzip compression you could set the following 
properties :
        
compression="on" compressionMinSize="2048" noCompressionUserAgents="gozilla, traviata" compressableMimeType="text/html,text/xml"
        -->

   <!-- Define a SSL HTTP/1.1 Connector on port 8443 -->
   <Connector port="8443" maxHttpHeaderSize="8192"
              maxThreads="150" minSpareThreads="25" maxSpareThreads="75"
              enableLookups="false" disableUploadTimeout="true"
              acceptCount="100" scheme="https" secure="true"
clientAuth="false" sslProtocol="TLS" keystoreFile="conf/enhydraKey.store" keystorePass="enhydra"/>
   <!-- Define an AJP 1.3 Connector on port 9009 -->
   <Connector port="9009"  propertiesFile="conf/jk2.properties"
              enableLookups="false" redirectPort="8443" protocol="AJP/1.3" />

<!-- Define a Tomcat - Enhydra Director Connector on port 9003 -->
   <Connector port="9003" threadTimeout = "300" clientTimeout = "30"
              
protocol="org.enhydra.servlet.connectionMethods.EnhydraDirector.DirectorProtocol"
              sessionAffinity = "true" queueSize = "400" numThreads = "200"
bindAddress = "(All Interfaces)" authKey = "(Unauthenticated)" allowTrace="false" scheme="http" secure="false" acceptCount="50" tcpNoDelay="true" enableLookups="false" redirectPort="8443" URIEncoding="ISO-8859-1"
              useBodyEncodingForURI="true" />

   <!-- Define a Proxied HTTP/1.1 Connector on port 8082 -->
   <!-- See proxy documentation for more information about using this. -->
   <!--
<Connector port="8082" maxThreads="150" minSpareThreads="25" maxSpareThreads="75"
              enableLookups="false" acceptCount="100" 
connectionTimeout="20000"
              proxyPort="80" disableUploadTimeout="true" />
   -->

   <!-- An Engine represents the entry point (within Catalina) that processes
        every request.  The Engine implementation for Tomcat stand alone
        analyzes the HTTP headers included with the request, and passes them
        on to the appropriate Host (virtual host). -->

   <!-- You should set jvmRoute to support load-balancing via AJP ie :
<Engine name="Standalone" defaultHost="localhost" jvmRoute="jvm1"> --> <!-- Define the top level container in our container hierarchy -->
   <Engine name="Catalina" defaultHost="localhost">

     <!-- The request dumper valve dumps useful debugging information about
          the request headers and cookies that were received, and the response
          headers and cookies that were sent, for all requests received by
          this instance of Tomcat.  If you care only about requests to a
          particular virtual host, or a particular application, nest this
          element inside the corresponding <Host> or <Context> entry instead.

          For a similar mechanism that is portable to all Servlet 2.4
          containers, check out the "RequestDumperFilter" Filter in the
          example application (the source for this filter may be found in
          "$CATALINA_HOME/webapps/examples/WEB-INF/classes/filters").

          Request dumping is disabled by default.  Uncomment the following
          element to enable it. -->
     <!--
     <Valve className="org.apache.catalina.valves.RequestDumperValve"/>
     -->

     <!-- Because this Realm is here, an instance will be shared globally -->

     <!-- This Realm uses the UserDatabase configured in the global JNDI
          resources under the key "UserDatabase".  Any edits
          that are performed against this UserDatabase are immediately
          available for use by the Realm.  -->
     <Realm className="org.apache.catalina.realm.UserDatabaseRealm"
            resourceName="UserDatabase"/>

     <!-- Comment out the old realm but leave here for now in case we
          need to go back quickly -->
     <!--
     <Realm className="org.apache.catalina.realm.MemoryRealm" />
     -->

     <!-- Replace the above Realm with one of the following to get a Realm
          stored in a database and accessed via JDBC -->

     <!--
     <Realm  className="org.apache.catalina.realm.JDBCRealm"
            driverName="org.gjt.mm.mysql.Driver"
         connectionURL="jdbc:mysql://localhost/authority"
        connectionName="test" connectionPassword="test"
             userTable="users" userNameCol="user_name" userCredCol="user_pass"
         userRoleTable="user_roles" roleNameCol="role_name" />
     -->

     <!--
     <Realm  className="org.apache.catalina.realm.JDBCRealm"
            driverName="oracle.jdbc.driver.OracleDriver"
         connectionURL="jdbc:oracle:thin:@ntserver:1521:ORCL"
        connectionName="scott" connectionPassword="tiger"
             userTable="users" userNameCol="user_name" userCredCol="user_pass"
         userRoleTable="user_roles" roleNameCol="role_name" />
     -->

     <!--
     <Realm  className="org.apache.catalina.realm.JDBCRealm"
            driverName="sun.jdbc.odbc.JdbcOdbcDriver"
         connectionURL="jdbc:odbc:CATALINA"
             userTable="users" userNameCol="user_name" userCredCol="user_pass"
         userRoleTable="user_roles" roleNameCol="role_name" />
     -->

     <!-- Define the default virtual host
          Note: XML Schema validation will not work with Xerces 2.2.
      -->
     <Host name="localhost" appBase="webapps"
      unpackWARs="true" autoDeploy="false"
      xmlValidation="false" xmlNamespaceAware="false">

       <!-- Defines a cluster for this node,
            By defining this element, means that every manager will be 
changed.
            So when running a cluster, only make sure that you have webapps 
in there
            that need to be clustered and remove the other ones.
            A cluster has the following parameters:

            className = the fully qualified name of the cluster class

            name = a descriptive name for your cluster, can be anything

            mcastAddr = the multicast address, has to be the same for all the 
nodes

            mcastPort = the multicast port, has to be the same for all the 
nodes
mcastBindAddr = bind the multicast socket to a specific address mcastTTL = the multicast TTL if you want to limit your broadcast mcastSoTimeout = the multicast readtimeout
            mcastFrequency = the number of milliseconds in between sending a "I'm 
alive" heartbeat

            mcastDropTime = the number a milliseconds before a node is considered 
"dead" if no heartbeat is received

tcpThreadCount = the number of threads to handle incoming replication requests, optimal would be the same amount of threads as nodes tcpListenAddress = the listen address (bind address) for TCP cluster request on this host, in case of multiple ethernet cards.
                               auto means that address becomes
                               InetAddress.getLocalHost().getHostAddress()

            tcpListenPort = the tcp listen port

            tcpSelectorTimeout = the timeout (ms) for the Selector.select() 
method in case the OS
                                 has a wakup bug in java.nio. Set to 0 for no 
timeout

            printToScreen = true means that managers will also print to 
std.out

expireSessionsOnShutdown = true means that
            useDirtyFlag = true means that we only replicate a session after 
setAttribute,removeAttribute has been called.
                           false means to replicate the session after each 
request.
                           false means that replication would work for the 
following piece of code: (only for SimpleTcpReplicationManager)
                           <%
                           HashMap map = (HashMap)session.getAttribute("map");
                           map.put("key","value");
                           %>
            replicationMode = can be either 'pooled', 'synchronous' or 
'asynchronous'.
                              * Pooled means that the replication happens 
using several sockets in a synchronous way. Ie, the data gets replicated, 
then the request return. This is the same as the 'synchronous' setting except 
it uses a pool of sockets, hence it is multithreaded. This is the fastest and 
safest configuration. To use this, also increase the nr of tcp threads that 
you have dealing with replication.
                              * Synchronous means that the thread that 
executes the request, is also the
                              thread the replicates the data to the other 
nodes, and will not return until all
                              nodes have received the information.
                              * Asynchronous means that there is a specific 
'sender' thread for each cluster node,
                              so the request thread will queue the replication request 
into a "smart" queue,
                              and then return to the client.
                              The "smart" queue is a queue where when a 
session is added to the queue, and the same session
                              already exists in the queue from a previous 
request, that session will be replaced
in the queue instead of replicating two requests. This almost never happens, unless there is a large network delay. --> <!--
           When configuring for clustering, you also add in a valve to catch 
all the requests
           coming in, at the end of the request, the session may or may not 
be replicated.
           A session is replicated if and only if all the conditions are met:
           1. useDirtyFlag is true or setAttribute or removeAttribute has 
been called AND
           2. a session exists (has been created)
           3. the request is not trapped by the "filter" attribute

           The filter attribute is to filter out requests that could not 
modify the session,
           hence we don't replicate the session after the end of this request.
           The filter is negative, ie, anything you put in the filter, you 
mean to filter out,
           ie, no replication will be done on requests that match one of the 
filters.
           The filter attribute is delimited by ;, so you can't escape out ; 
even if you wanted to.

           filter=".*/.gif;.*/.js;" means that we will not replicate the 
session after requests with the URI
           ending with .gif and .js are intercepted.
The deployer element can be used to deploy apps cluster wide.
           Currently the deployment only deploys/undeploys to working members 
in the cluster
           so no WARs are copied upons startup of a broken node.
           The deployer watches a directory (watchDir) for WAR files when 
watchEnabled="true"
           When a new war file is added the war gets deployed to the local 
instance,
           and then deployed to the other instances in the cluster.
When a war file is deleted from the watchDir the war is undeployed locally and cluster wide
       -->
<!--
       <Cluster className="org.apache.catalina.cluster.tcp.SimpleTcpCluster"
                
managerClassName="org.apache.catalina.cluster.session.DeltaManager"
                expireSessionsOnShutdown="false"
                useDirtyFlag="true"
                notifyListenersOnReplication="true">

<Membership className="org.apache.catalina.cluster.mcast.McastService"
               mcastAddr="228.0.0.4"
               mcastPort="45564"
               mcastFrequency="500"
               mcastDropTime="3000"/>

<Receiver className="org.apache.catalina.cluster.tcp.ReplicationListener"
               tcpListenAddress="auto"
               tcpListenPort="4001"
               tcpSelectorTimeout="100"
               tcpThreadCount="6"/>

           <Sender
               
className="org.apache.catalina.cluster.tcp.ReplicationTransmitter"
               replicationMode="pooled"
               ackTimeout="15000"/>

           <Valve className="org.apache.catalina.cluster.tcp.ReplicationValve"
                  
filter=".*/.gif;.*/.js;.*/.jpg;.*/.png;.*/.htm;.*/.html;.*/.css;.*/.txt;"/>
<Deployer className="org.apache.catalina.cluster.deploy.FarmWarDeployer"
                     tempDir="/tmp/war-temp/"
                     deployDir="/tmp/war-deploy/"
                     watchDir="/tmp/war-listen/"
                     watchEnabled="false"/>
       </Cluster>
-->


       <!-- Normally, users must authenticate themselves to each web app
            individually.  Uncomment the following entry if you would like
            a user to be authenticated the first time they encounter a
            resource protected by a security constraint, and then have that
            user identity maintained across *all* web applications contained
            in this virtual host. -->
       <!--
       <Valve className="org.apache.catalina.authenticator.SingleSignOn" />
       -->

       <!-- Access log processes all requests for this virtual host.  By
            default, log files are created in the "logs" directory relative to
            $CATALINA_HOME.  If you wish, you can specify a different
            directory with the "directory" attribute.  Specify either a 
relative
            (to $CATALINA_HOME) or absolute path to the desired directory.
       -->
       <!--
       <Valve className="org.apache.catalina.valves.AccessLogValve"
                directory="logs"  prefix="localhost_access_log." suffix=".txt"
                pattern="common" resolveHosts="false"/>
       -->

       <!-- Access log processes all requests for this virtual host.  By
            default, log files are created in the "logs" directory relative to
            $CATALINA_HOME.  If you wish, you can specify a different
            directory with the "directory" attribute.  Specify either a 
relative
            (to $CATALINA_HOME) or absolute path to the desired directory.
            This access log implementation is optimized for maximum 
performance,
            but is hardcoded to support only the "common" and "combined" 
patterns.
       -->
       <!--
       <Valve className="org.apache.catalina.valves.FastCommonAccessLogValve"
                directory="logs"  prefix="localhost_access_log." suffix=".txt"
                pattern="common" resolveHosts="false"/>
       -->
       <!-- Access log processes all requests for this virtual host.  By
            default, log files are created in the "logs" directory relative to
            $CATALINA_HOME.  If you wish, you can specify a different
            directory with the "directory" attribute.  Specify either a 
relative
            (to $CATALINA_HOME) or absolute path to the desired directory.
            This access log implementation is optimized for maximum 
performance,
            but is hardcoded to support only the "common" and "combined" 
patterns.

            This valve use NIO direct Byte Buffer to asynchornously store the
            log.
       -->
       <!--
       <Valve className="org.apache.catalina.valves.ByteBufferAccessLogValve"
                directory="logs"  prefix="localhost_access_log." suffix=".txt"
                pattern="common" resolveHosts="false"/>
       -->

     </Host>

   </Engine>

 </Service>

</Server>
------------------------------------------------------------------------


--
You receive this message as a subscriber of the enhydra@xxxxxxxxxxxxx mailing 
list.
To unsubscribe: mailto:enhydra-unsubscribe@xxxxxxxxxxxxx
For general help: mailto:sympa@xxxxxxxxxxxxx?subject=help
ObjectWeb mailing lists service home page: http://www.objectweb.org/wws




<--  Date Index  --> <--  Thread Index  -->

Reply via email to:

Powered by MHonArc.

Copyright © 1999-2005, ObjectWeb Consortium | contact | webmaster.