说起JBoss集群好像很高深的样子,其实一点也不恐怖,建立一个集群很简单,难的是怎么针对具体的应用优化服务器和实现负载均衡(学习中^o^)。本文将带领大家在JBoss的default目录下建立一个简单的Web方面的JBoss集群。
搭建环境
两台电脑 //其实一台也够了,不过需要修改其中一个JBoss监听的端口,要不然有冲突
jboss-4.0.4.GA
apache_2.0.59 //我使用的是apache_2.0.59-win32-x86-no_ssl,其实无所谓的
mod_jk-apache-2.0.59.so //Apache请求分发的模块,官网上可以找到
首先安装JBoss,我用的是zip格式的,直接解压缩就可以了,在两台电脑里分别安装。
接下来在其中一台电脑上(这里是192.168.0.2)安装Apache(其实应该再找一台电脑来安装的),很简单,略过^o^(偶是不是很懒^o^)
配置JBoss
假设两台电脑的IP分别为192.168.0.2和192.168.0.3。我们这里使用JBoss的default目录。
将如下文件从%JBoss_Home%/server/all/lib里面拷到%JBoss_Home%/server/default/lib目录下:
jbossha.jar(加载org.jboss.ha.framework.server.ClusterPartition)
jgroups.jar(JBoss集群底层通信协议)
jboss-cache.jar(加载org.jboss.cache.aop.TreeCacheAop)
还要从%JBoss_Home%/server/all/deploy里把cluster-service.xml和tc5-cluster.sar拷贝到%JBoss_Home%/server/default/deploy里面。
编辑192.168.0.2的%JBoss_Home%/server/default/deploy/jbossweb-tomcat55.sar/server.xml
修改下面代码:
修改为:
其中 jvmRoute是用来让apache识别的节点名称,一个节点一个名称,注意不要有重复的(可以结合IP设置)。
同理编辑192.168.0.3的%JBoss_Home%/server/default/deploy/jbossweb-tomcat55.sar/server.xml
注意把jvmRoute设置为node2,可以设置成别的只要和192.168.0.2的不重复就行,但是要和Apache的workers.properties(稍后介绍)下的配置一致。
在%JBoss_Home%/server/default/deploy/jbossweb-tomcat55.sar/ROOT.war/目录下添加一个新文件夹/test,并在里面添加如下3个jsp文件:
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test_action.jsp
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session.jsp
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编辑%JBoss_Home%/server/default/deploy/jbossweb-tomcat55.sar/ROOT.war/WEB-INF/web.xml在<web-app>节点下增加如下代码:
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到这里JBoss就配置完成了^o^
配置Apache
JBoss 的Web集群使用apache的mod_jk,浏览器请求apache服务器,apache服务器根据workers.properties中的配置进行 request分发,apache服务器和Jboss中的Tomcat可以用ajp1.3进行通信的,request通过ajp1.3协议的包装被发送到 Jboss,Jboss执行后返回结果。
将下载到的mod_jk-apache-2.0.59.so保存到%Apache%/modules/目录下,并去掉版本号重命名为“mod_jk.so”,如果不改也可以在mod-jk.conf文件(稍后介绍)里修改配置。
在%Apache%/conf/目录下新建mod-jk.conf,并将如下代码添加进去:
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编辑%Apache%/conf/httpd.conf在最后一行添加如下代码:
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在 %Apache%/conf/目录下添加workers.properties文件,该文件就是配置Apache所要将request转发到的JBoss的路径信息,代码如下:
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上述代码中:
port是配置JBoss AJP所监听的端口号,可以在%JBoss_Home%/server/default/deploy/jbossweb-tomcat55.sar/server.xml 看到,如下
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lbfactor定义该节点的权重,数字越大分发到该节点的request越多
cachesize是servlet线程池的大小(对session复制有影响)
到这里所有的配置就全部完成啦^o^
启动192.168.0.2上的apache和两台机器上的JBoss。
打开浏览器,输入网址访问apache: http://192.168.0.2/test/index.jsp ,回车!看到了吧?
页面上有JBoss所在机器的IP地址,刷新页面还能看到IP在变化,说明apache将request分发到了不同的JBoss上,在输入框中输入随便一个字符串并提交还能测试JBoss 的session复制情况。
^o^