centos环境停apache集群tomcat与负载均衡配置笔记

2012-07-16

centos环境下apache集群tomcat与负载均衡配置笔记系统环境：centos4.8应用版本：apache：2.2.3tomcat：7.0.14

centos环境下apache集群tomcat与负载均衡配置笔记
系统环境：centos4.8
应用版本：
apache：2.2.3
tomcat：7.0.14
配置要点：
1.tomcat session复制：
server.xml,在<Engine>节点下添加:

<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"                 channelSendOptions="8">          <Manager className="org.apache.catalina.ha.session.DeltaManager"                   expireSessionsOnShutdown="false"                   notifyListenersOnReplication="true"/>          <Channel className="org.apache.catalina.tribes.group.GroupChannel">            <Membership className="org.apache.catalina.tribes.membership.McastService"                        address="228.0.0.4"  <!-- 此地址不变 -->                        port="45564"                        frequency="500"                        dropTime="3000"/>            <Receiver className="org.apache.catalina.tribes.transport.nio.NioReceiver"                      address="auto"//tcpListenPort如果是同一机器部署两个tomcat7应用，则修改tomcat7_b为4001，以免冲突. 不同机器下，不用更改此项.                      port="4000"                      autoBind="100"                      selectorTimeout="5000"                      maxThreads="6"/>            <Sender className="org.apache.catalina.tribes.transport.ReplicationTransmitter">              <Transport className="org.apache.catalina.tribes.transport.nio.PooledParallelSender"/>            </Sender>            <Interceptor className="org.apache.catalina.tribes.group.interceptors.TcpFailureDetector"/>            <Interceptor className="org.apache.catalina.tribes.group.interceptors.MessageDispatch15Interceptor"/>          </Channel>          <Valve className="org.apache.catalina.ha.tcp.ReplicationValve"                 filter=""/>          <Valve className="org.apache.catalina.ha.session.JvmRouteBinderValve"/>// 如果tomcat启动出现：严重: FarmWarDeployer can only work as host cluster subelement! 可以将此节点去掉           <Deployer className="org.apache.catalina.ha.deploy.FarmWarDeployer"                    tempDir="/tmp/war-temp/"                    deployDir="/tmp/war-deploy/"                    watchDir="/tmp/war-listen/"                    watchEnabled="false"/>          <ClusterListener className="org.apache.catalina.ha.session.JvmRouteSessionIDBinderListener"/>          <ClusterListener className="org.apache.catalina.ha.session.ClusterSessionListener"/>        </Cluster>

2. 为tomcat增加唯一标示（个人理解），添加jvmRoute属性，apache负载均衡用到
<Engine name="Catalina" defaultHost="localhost" jvmRoute="tomcat7_1">
<Engine name="Catalina" defaultHost="localhost" jvmRoute="tomcat7_2">

3.同一机子上有多个tomcat，SHUTDOWN 端口不能冲突。
tomcat7_1：<Server port="8006" shutdown="SHUTDOWN">
tomcat7_2：<Server port="8007" shutdown="SHUTDOWN">

4.同理，http端口和ajp端口都不能冲突：
eg：
<connector port="8082" protocol="HTTP/1.1" onnectionTimeout="20000" edirectPort="8443" />
<Connector port="8009" protocol="AJP/1.3" redirectPort="8443" />

5. 为了方便测试，直接用到了webapps 中的examples工程，
tomcat7_1\webapps\examples\WEB-INF\web.xml中加入<distributable/>
tomcat7_2\webapps\examples\WEB-INF\web.xml中加入<distributable/>
两个tomcat中examples工程都加入test.jsp
代码如下：

<%@ page contentType="text/html; charset=UTF-8" %><%@ page import="java.util.*" %><html><head><title>Cluster Test</title></head><body><%  //HttpSession session = request.getSession(true);  System.out.println(session.getId());  out.println("<br> SESSION ID:" + session.getId()+"<br>");      String name = request.getParameter("name");  if (name != null && name.length() > 0) {     String value = request.getParameter("value");     session.setAttribute(name, value);  }  out.print("<b>Session List:</b>");  Enumeration<String> names = session.getAttributeNames();while (names.hasMoreElements()) {String sname = names.nextElement(); String value = session.getAttribute(sname).toString();out.println( sname + " = " + value+"<br>");        System.out.println( sname + " = " + value);   }%>  <form action="test.jsp" method="post">    session名称:<input type=text size=20 name="name">     <br>    session值:<input type=text size=20 name="value">     <br>    <input type=submit value="提交">   </form></body></html>

在此，session复制工作完毕，测试：
访问tomcat7_1输入session名称和值提交以后再访问tomcat7_2，如果session列表中有tomcat7_1的名称和值说明session同步工作成功！

6.负载均衡配置：

负载方式有jk和 mod_proxy
jk方式曾经已经做过，本次尝试mod_proxy

配置步骤：
httpd.conf中增加以下模块：

LoadModule proxy_module modules/mod_proxy.so  LoadModule proxy_ajp_module modules/mod_proxy_ajp.so  LoadModule proxy_balancer_module modules/mod_proxy_balancer.so  LoadModule proxy_connect_module modules/mod_proxy_connect.so  LoadModule proxy_ftp_module modules/mod_proxy_ftp.so  LoadModule proxy_http_module modules/mod_proxy_http.so

再增加：

#虚拟机配置,负载均衡配置
<VirtualHost *:80>
ServerAdmin xxxx@qq.com
ServerName localhost
ServerAlias localhost
ProxyPass / balancer://cluster/ stickysession=JSESSIONID|jsessionid nofailover=On
ProxyPassReverse / balancer://cluster/
#ErrorLog "logs/error.log"
#CustomLog "logs/access.log" common
</VirtualHost>

ProxyRequests Off
<proxy balancer://cluster>
BalancerMember ajp://内网ip:8009 loadfactor=1 route=tomcat7_1 smax=5 max=20 ttl=120 retry=300 timeout=15
BalancerMember ajp://内网ip:8010 loadfactor=1 route=tomcat7_2 smax=5 max=20 ttl=120 retry=300 timeout=15

# status=+H为配置热备，当所有机器都over时，才会请求该机器
#BalancerMember http://xxxxxxx:8009 status=+H

#lbmethod=byrequests 按照请求次数均衡(默认)
#lbmethod=bytraffic 按照流量均衡
#lbmethod=bybusyness 按照繁忙程度均衡(总是分配给活跃请求数最少的服务器)
ProxySet lbmethod=bytraffic
</proxy>

配置完毕。将今天的奋战结果记录下来，方便以后参考。好记性不如iteye的博客，

热点排行

操作系统

centos环境停apache集群tomcat与负载均衡配置笔记