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	<title>lizongbo at 618119.com &#187; distributable</title>
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		<title>对tomcat cluster集群配置中session复制用法的一个误解</title>
		<link>http://618119.com/archives/2007/11/13/26.html</link>
		<comments>http://618119.com/archives/2007/11/13/26.html#comments</comments>
		<pubDate>Tue, 13 Nov 2007 00:34:48 +0000</pubDate>
		<dc:creator>lizongbo</dc:creator>
				<category><![CDATA[Apache]]></category>
		<category><![CDATA[Tomcat]]></category>
		<category><![CDATA[Web Server]]></category>
		<category><![CDATA[Cluster]]></category>
		<category><![CDATA[distributable]]></category>
		<category><![CDATA[JGroups]]></category>
		<category><![CDATA[jvmRoute]]></category>
		<category><![CDATA[loadbalancer]]></category>
		<category><![CDATA[mod_jk]]></category>
		<category><![CDATA[session复制]]></category>
		<category><![CDATA[Tribes]]></category>
		<category><![CDATA[负载均衡]]></category>
		<category><![CDATA[集群]]></category>

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		<description><![CDATA[一直以来，我误解认为启动了n个tomcat，则Session需要同步复制到n个Tomcat中存在，因此在启动了6个以上的Tomcat，性能会大大下降。 而实际情况下，采取Apache 加Tomcat进行负载均衡集群的时候，是可以不用将Session复制到所有的节点里， 比如有六个Tomcat实例 Tomcat1,Tomcat2,Tomcat3,Tomcat4,Tomcat5,Tomcat6 是可以配置成 三组互相复制Session的群组， 比如Tomcat1和Tomcat2互相同步Session, 比如Tomcat3和Tomcat4互相同步Session, 比如Tomcat5和Tomcat6互相同步Session. 再在Apache的mod_jk模块里，对每个worker配置上redirect和activation属性。 将Tomcat1,Tomcat3,Tomcat5做为对外正常提供服务器的Tomcat, Tomcat2,Tomcat4,Tomcat6作为分别对应的灾难恢复的备份Tomcat. 即比如Tomcat1当机之后，Apache会自动将发给Tomcat1的请求转发到Tomcat2上， 而Tomcat2因为同步了Tomcat1的Session信息，因此从用户的角度，是感觉不出任何差异的。 单纯的Tomcat测试如下： Tomcat配置： Tomcat1. port=&#8221;15080&#8243;, jvmRoute=&#8221;tomcat1&#8243;, &#60;Membership className=&#8221;org.apache.catalina.tribes.membership.McastService&#8221; address=&#8221;228.0.0.5&#8243; port=&#8221;45564&#8243; frequency=&#8221;500&#8243; dropTime=&#8221;3000&#8243;/&#62; Tomcat2. port=&#8221;16080&#8243;, jvmRoute=&#8221;tomcat2&#8243;, &#60;Membership className=&#8221;org.apache.catalina.tribes.membership.McastService&#8221; address=&#8221;228.0.0.5&#8243; port=&#8221;45564&#8243; frequency=&#8221;500&#8243; dropTime=&#8221;3000&#8243;/&#62; Tomcat3. port=&#8221;17080&#8243;, jvmRoute=&#8221;tomcat3&#8243;, &#60;Membership className=&#8221;org.apache.catalina.tribes.membership.McastService&#8221; address=&#8221;228.0.0.6&#8243; port=&#8221;45564&#8243; frequency=&#8221;500&#8243; dropTime=&#8221;3000&#8243;/&#62; Tomcat4. port=&#8221;18080&#8243;, jvmRoute=&#8221;tomcat4&#8243;, &#60;Membership className=&#8221;org.apache.catalina.tribes.membership.McastService&#8221; address=&#8221;228.0.0.6&#8243; port=&#8221;45564&#8243; frequency=&#8221;500&#8243; dropTime=&#8221;3000&#8243;/&#62; Tomcat5. port=&#8221;19080&#8243;, [...]]]></description>
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