apache+tomcat 负载均衡

1 需求:
    apache-tomcat-5.5.27
    jdk1.6.0_10
    tomcat-connectors-1.2.27
    httpd-2.2.10

2 安装:
    1) 分别在三台机器上安装 tomcat,路径为/var/apps/apache-tomcat-5.5.27
    2) 分别在三台机器上配置JDK,JAVA_PATH=/var/apps/jdk1.6.0_10
    3) 在其中一台机器上安装apache,路径为/var/apps/httpd-2.2.10
    4) 配置生成mod_jk.so
        进入tomcat-connectors-1.2.27/native
        执行:./configure --with-apxs=/var/apps/httpd-2.2.10/bin/apxs
        make;make install

3 配置apache:
    httpd.conf:
       

LoadModule jk_module modules/mod_jk.so    
        JkWorkersFile conf/workers.properties
        JkLogFile logs/mod_jk.log
        # Set the jk log level [debug/error/info] 
        JkLogLevel info
        # Select the log format 
        JkLogStampFormat "[%a %b %d %H:%M:%S %Y]"
        # JkRequestLogFormat set the request format 
        JkRequestLogFormat "%w %V %T"
        # JkOptions indicate to send SSL KEY SIZE, 
        JkOptions +ForwardKeySize +ForwardURICompat -ForwardDirectories
        # 将所有servlet 和jsp请求通过ajp13的协议送给Tomcat，让Tomcat来处理
        JkMount /servlet/* loadbalancer
        JkMount /*.jsp loadbalancer

       
    注:也可以把配置文件写在mod_jk.conf 文件中,然后在httpd.conf中,加入include conf/mod_jk.conf

    workers.properties:
        (自tomcat-connectors-1.2.27/conf中复制到httpd-2.2.10/conf中)
      

 workers.tomcat_home=/var/apps/apache-tomcat-5.5.27
        workers.java_home=/var/apps/jdk1.6.0_10
        ps=/
        # The workers that your plugins should create and work with
        # Add 'inprocess' if you want JNI connector
        worker.list=loadbalancer ---不是tomcat服务器的Engine的名字
        # , inprocess
        #DEFAULT ajp12 WORKER DEFINITION 
        worker.ajp12.port=8009
        worker.ajp12.host=192.168.0.126
        #　worker.worker名字.type =<worker类型>,下面的ajp13是协议类型,ajp12太是名字.
        worker.ajp12.type=ajp13
        # a load balancing worker.Low lbfactor means less work done by the worker
        worker.ajp12.lbfactor=1
        #DEFAULT ajp13 WORKER DEFINITION 
        worker.ajp13.port=8009
        worker.ajp13.host=192.168.0.128
        worker.ajp13.type=ajp13
        worker.ajp13.lbfactor=1
        # Specify the size of the open connection pool.
        #worker.ajp13.connection_pool_size
        worker.loadbalancer.type=lb
        worker.loadbalancer.balance_workers=ajp12,ajp13
        # DEFAULT JNI WORKER DEFINITION
        # Defining a worker named inprocess and of type jni
        # Note that the name and the type do not have to match.
        worker.inprocess.type=jni
        # CLASSPATH DEFINITION 
        # Additional class path components.
        worker.inprocess.class_path=$(workers.tomcat_home)$(ps)lib$(ps)tomcat.jar
        # Setting the command line for tomcat.
        # Note: The cmd_line string may not contain spaces.
        worker.inprocess.cmd_line=start
        # Not needed, but can be customized.
        #worker.inprocess.cmd_line=-config
        #worker.inprocess.cmd_line=$(workers.tomcat_home)$(ps)conf$(ps)server.xml
        #worker.inprocess.cmd_line=-home
        #worker.inprocess.cmd_line=$(workers.tomcat_home)
        # The JVM that we are about to use
        # This is for Java2
        # Windows
        worker.inprocess.jvm_lib=$(workers.java_home)$(ps)jre$(ps)bin$(ps)classic$(ps)jvm.dll
        # IBM JDK1.3
        #worker.inprocess.jvm_lib=$(workers.java_home)$(ps)jre$(ps)bin$(ps)classic$(ps)libjvm.so
        # Unix - Sun VM or blackdown
        #worker.inprocess.jvm_lib=$(workers.java_home)$(ps)jre$(ps)lib$(ps)i386$(ps)classic$(ps)libjvm.so
        # And this is for jdk1.1.X
        #worker.inprocess.jvm_lib=$(workers.java_home)$(ps)bin$(ps)javai.dll
        # Setting the place for the stdout and stderr of tomcat
        worker.inprocess.stdout=$(workers.tomcat_home)$(ps)logs$(ps)inprocess.stdout
        worker.inprocess.stderr=$(workers.tomcat_home)$(ps)logs$(ps)inprocess.stderr
        # Setting the tomcat.home Java property
        #worker.inprocess.sysprops=tomcat.home=$(workers.tomcat_home)
        # Java system properties
        # worker.inprocess.sysprops=java.compiler=NONE
        # worker.inprocess.sysprops=myprop=mypropvalue
        # Additional path components.
        # worker.inprocess.ld_path=d:$(ps)SQLLIB$(ps)bin

4 配置tomcat:
    apache服务器的tomcat:不需要做什么修改
    tomcat服务器:
        ajp12:
          

 <Engine name="Catalina" defaultHost="localhost" jvmRoute="ajp12">

        ajp13:
          

 <Engine name="Catalina" defaultHost="localhost" jvmRoute="ajp13">

5 启动服务:
    启动tomcat,apache的服务

p.s.
    出现错误:org.apache.jk.common.MsgAjp processHeader
        严重: BAD packet signature 256
    解决方法:workers.properties文件中,tomcat服务器的协议类型错误,应都改为ajp13,即为ajp协议V13.