一、规划

前端Apache:192.168.10.135

后端tomcat:192.168.10.132

                   192.168.10.133

二、配置Tomcat

①配置server.xml

# vi /usr/local/tomcat/conf/server.xml               ##位于103行TomcatA:
TomcatB:

②配置测试页

# cd /usr/local/tomcat/webapps/ROOT# mv index.jsp index.jsp.bak# vi index.jsp

TomcatA:

<%@ page language="java" %>  TomcatA      

TomcatA 

    
              Session ID    <% session.setAttribute("abc","abc"); %>        <%= session.getId() %>                    Created on        <%= session.getCreationTime() %>           

TomcatB:

<%@ page language="java" %>  TomcatB      

TomcatB 

    
              Session ID    <% session.setAttribute("abc","abc"); %>        <%= session.getId() %>                    Created on        <%= session.getCreationTime() %>           

三、基于mod_jk实现

①配置mod_jk配置文件

# vi /etc/httpd/conf/mod_jk.confJkWorkersFile  /etc/httpd/conf/workers.properties   ##指出mod_jk工作所需文件位置JkLogFile  logs/mod_jk.log                   ##指定日志输出文件位置JkLogLevel  debug                         ##指定日志级别JkLogStampFormat "[%a %b %d %H:%M:%S %Y]"JkOptions +ForwardKeySize +ForwardURICompat -ForwardDirectoriesJkRequestLogFormat "%w %V %T"JkMount  /*  lbcluster1                   ##指定负载均衡器名称JkMount  /status/  stat1                 ##指定状态信息

②配置worker.properties

# vi /etc/httpd/conf/workers.properties# workers 列表worker.list = lbcluster1,stat1#-------------------------------------------------# tomcat实例1#-------------------------------------------------worker.TomcatA.type = ajp13              ##定向包协议worker.TomcatA.host = 192.168.10.132     ##tomcat主机地址worker.TomcatA.port = 8009            ##TomcatA实例端口worker.TomcatA.lbfactor = 1             ##负载均衡权重为1#-------------------------------------------------# tomcat实例2#-------------------------------------------------worker.TomcatB.type = ajp13worker.TomcatB.host = 192.168.10.133worker.TomcatB.port = 8009worker.TomcatB.lbfactor = 1#-------------------------------------------------# load balancer worker --负载均衡控制器# ------------------------------------------------worker.lbcluster1.type = lb             ##负载均衡work,lb内置类worker.lbcluster1.sticky_session = 0       ##会话是否绑定worker.lbcluster1.balance_workers = TomcatA, TomcatB     ##指定集群拥有实例worker.stat1.type = status                    ##状态信息

③配置httpd

# vi /etc/httpd/conf/httpd.confLoadModule jk_module modules/mod_jk.so           ##加载mod_jk模块Include /etc/httpd/conf/mod_jk.conf             ##指定mod_jk配置文件

④测试

输入前端Apache地址查看

刷新后继续查看

前端输入http://localhost/status/查看集群状态

⑤实现会话复制

a.在 <Engine>或 <Host>元素节点下添加以下内容:

# vi /usr/local/tomcat/conf/server.xml
          
          
            
            
            
              
                        
            
                    
          
          
          
        

b.在启用集群功能的web应用程序的web.xml中添加<distributable/>以实现集群功能

# vi /usr/local/tomcat/conf/web.xml
# cp /usr/local/tomcat/conf/web.xml /usr/local/tomcat/webapps/ROOT/WEB-INF/

详情:

c.测试

输入前端Apache地址查看

刷新后继续查看

TomcatA和TomcatB已经实现了会话共享

四、基于mod_proxy实现

①查看相关代理模块是否装载(其中balancer为集群实现模块)

# httpd -D DUMP_MODULES | grep proxy          proxy_module (shared) proxy_ajp_module (shared) proxy_balancer_module (shared) proxy_connect_module (shared) proxy_express_module (shared) proxy_fcgi_module (shared) proxy_fdpass_module (shared) proxy_ftp_module (shared) proxy_http_module (shared) proxy_scgi_module (shared)

②配置httpd

# vi /etc/httpd/conf/httpd.conf
ServerAdmin localhostServerName localhostProxyPass / balancer://cluster1/ stickysession=jsessionidProxyPa***everse / balancer://cluster1/ProxyRequests Off
BalancerMember ajp://192.168.10.132:8009 loadfactor=1 route=TomcatABalancerMember ajp://192.168.10.133:8009 loadfactor=1 route=TomcatBProxySet  lbmethod=bytraffic

注:

ProxySet  lbmethod={byrequests|bytraffic|bybusyness}:负载均衡的实现方式

byrequests:按照请求次数负载均衡(默认)

bytraffic:按照流量负载均衡

bybusyness:安装繁忙程度负载均衡(总是分配给活跃请求数最少的服务器)

③测试

输入TomcatA地址查看:

输入TomcatB地址查看:

输入前端Apache地址查看:

刷新继续查看: