CentOS下Apache + Tomcat集群

1.以下几个包是需要下载的
Tomcat http://apache.etoak.com/tomcat/tomcat-7/v7.0.27/bin/apache-tomcat-7.0.27.tar.gz
Apr  http://labs.renren.com/apache-mirror//apr/apr-1.4.6.tar.gz
Apr Util http://apache.etoak.com//apr/apr-util-1.4.1.tar.gz
Apache Http Server http://labs.renren.com/apache-mirror//httpd/httpd-2.2.22.tar.gz
Connector    http://www.apache.org/dist/tomcat/tomcat-connectors/jk/tomcat-connectors-1.2.35-src.tar.gz

2.安装APR
[root@localhost app]#tar -zxvf apr-1.4.6.tar.gz
[root@localhost app]#cd apr-1.4.6

[root@localhost apr-1.4.6]#./buildconf
buildconf: checking installation...
buildconf: python version 2.6.5 (ok)
buildconf: autoconf not found.
           You need autoconf version 2.59 or newer installed
           to build APR from SVN.
[root@localhost apr-1.4.6]#yum install autoconf

[root@localhost apr-1.4.6]#./buildconf
buildconf: libtool not found.
           You need libtool version 1.4 or newer installed
           to build APR from SVN.
[root@localhost apr-1.4.6]#yum install libtool

[root@localhost apr-1.4.6]#./configure

[root@localhost apr-1.4.6]# make
-bash: make: command not found
[root@localhost apr-1.4.6]#yum install make

[root@localhost apr-1.4.6]# make
[root@localhost apr-1.4.6]# make install

3.安装APR Utils

[root@localhost app]# tar -zxvf apr-util-1.4.1.tar.gz
[root@localhost app]# cd apr-util-1.4.1
[root@localhost apr-util-1.4.1]#./buildconf --with-apr=/app/apr-1.4.6
[root@localhost apr-util-1.4.1]# ./configure --with-apr=/app/apr-1.4.6
[root@localhost apr-util-1.4.1]#make
[root@localhost apr-util-1.4.1]#make install

4.安装Apache Http Server

[root@localhost app]# tar -zxvf httpd-2.2.22.tar.gz
[root@localhost app]# cd httpd-2.2.22
[root@localhost httpd-2.2.22]# ./buildconf
[root@localhost httpd-2.2.22]# ./configure
[root@localhost httpd-2.2.22]# make
[root@localhost httpd-2.2.22]# make install

5.安装Apache 和 Tomcat 的连接器Connector

[root@localhost app]tar -zxvf tomcat-connectors-1.2.35-src.tar.gz
[root@localhost app]cd tomcat-connectors-1.2.35-src/native
[root@localhost native]# ./configure --with-apxs=/usr/local/apache2/bin/apxs
[root@localhost native]#make
[root@localhost native]#make install

注意：该tar.gz文件里面其实有很多关于配置的详细文档，如果出现问题可以再其中进行查阅,另外，我的编译应该说是成功了，但是生成的文件却不能用，后来是去网上下载了个已经编译好了的才解决的


6.配置Apache Http Server
原文是说Apache 的httpd.conf是在/usr/local/apache2/conf/目录下面，但是实际上我发现控制Apache的文件却是在/etc/httpd/conf/目录下面，这点还请高手赐教

在文件最后加上下面一句话就可以了

Include conf/mod_jk.conf

7.在httpd.conf文件同一目录下建立mod_jk.conf文件，内容如下：

#load mod_jk Module
LoadModule jk_module /usr/local/apache2/modules/mod_jk.so

#arrange workers.properties path
JkWorkersFile conf/workers.properties
JkLogFile /usr/local/apache2/logs/mod_jk.log
JkLogLevel info

JkMount /* controller
JkMount /*.jsp controller
JkMount /*.action controller
JkMount /*.do controller
#JkMount /jkstatus status

8.在httpd.conf同目录下新建 workers.properties文件，内容如下：

worker.list = controller,tomcat1,tomcat2  #server 列表

#========tomcat1========
worker.tomcat1.port=8009         #ajp13 端口号，在tomcat下server.xml配置,默认8009
worker.tomcat1.host=localhost  #tomcat的主机地址，如不为本机，请填写ip地址
worker.tomcat1.type=ajp13
worker.tomcat1.lbfactor = 1   #server的加权比重，值越高，分得的请求越多

#========tomcat2========
worker.tomcat2.port=9009       #ajp13 端口号，在tomcat下server.xml配置,默认8009
worker.tomcat2.host=localhost  #tomcat的主机地址，如不为本机，请填写ip地址
worker.tomcat2.type=ajp13
worker.tomcat2.lbfactor = 1   #server的加权比重，值越高，分得的请求越多

#========controller,负载均衡控制器========
worker.controller.type=lb
worker.controller.balance_workers=tomcat1,tomcat2   #指定分担请求的tomcat
worker.controller.sticky_session=1

9.解压apache-tomcat-7.0.27.tar.gz，并copy一份，home目录分别命名为tomcat1，tomcat2

[root@localhost app]# tar -zxvf apache-tomcat-7.0.27.tar.gz
[root@localhost app]# mv apache-tomcat-7.0.27 tomcat1
[root@localhost app]# cp -R tomcat1/ tomcat2

10.更改tomcat2的server.xml文件，由于我的两个tomcat是在同一个服务器上，所以要修改下面红颜色的端口，以防端口冲突.

<Server port="9005" shutdown="SHUTDOWN">

<Connector port="9080" protocol="HTTP/1.1"
               connectionTimeout="20000"
               redirectPort="8443" />

这个是APJ端口：

  <Connector port="9009" protocol="AJP/1.3" redirectPort="8443" />

11.下面是关于负载均衡的配置，在2个tomcat的server.xml中：

<!-- You should set jvmRoute to support load-balancing via AJP ie :
<Engine name="Catalina" defaultHost="localhost" jvmRoute="jvm1">
-->
<Engine name="Catalina" defaultHost="localhost" jvmRoute="tomcat2"><!--tomcat2将与tomcat1黏贴session 在这里指定黏贴对象-->

下面这段代码也是必须的，注意端口不能重复：

<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"  
     channelSendOptions="6"> 
      
      
     <Manager className="org.apache.catalina.ha.session.DeltaManager" 
         expireSessionsOnShutdown="false" 
         notifyListenersOnReplication="true"/> 
     <!-- 
     <Manager className="org.apache.catalina.ha.session.BackupManager" 
         expireSessionsOnShutdown="false" 
         notifyListenersOnReplication="true" 
         mapSendOptions="6"/> 
     --> 
     <Channel className="org.apache.catalina.tribes.group.GroupChannel"> 
         <Membership className="org.apache.catalina.tribes.membership.McastService" 
             address="228.0.0.5" 
             port="45564" 
             frequency="500" 
             dropTime="3000"/> 
        <Receiver className="org.apache.catalina.tribes.transport.nio.NioReceiver" 
             address="auto" 
             port="4000"  <!--tomcat1将与tomcat2的端口不同-->
             selectorTimeout="100" 
             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=".*/.gif;.*/.js;.*/.jpg;.*/.png;.*/.htm;.*/.html;.*/.css;.*/.txt;"/>  
     <ClusterListener className="org.apache.catalina.ha.session.JvmRouteSessionIDBinderListener"/> 
     <ClusterListener className="org.apache.catalina.ha.session.ClusterSessionListener"/> 
  </Cluster>

这是最后我遇到的问题和解决方法：
如果mod_jk.so权限组出现问题请使用一下命令：

chcon -t httpd_modules_t /usr/local/apache2/modules/mod_jk.so

错误: undefined symbol: ap_get_server_description
解决办法：下载编译好的文件http://archive.apache.org/dist/tomcat/tomcat-connectors/jk/binaries/linux/jk-1.2.30/i586/

如果启动Httpd失败但是没有错误信息，要检查/etc/httpd/logs下的error_log文件

如果是因为SELinux的问题，可以关闭之


转自：http://blog.csdn.net/daihui05/article/details/7524745