Apache+Tomcat+JK配置负载均衡
这一节讲述Apache+Tomcat+JK配置
运行环境：
WindowXP
Tomcat6.0.18
Apache2.2.15
mod_jk mod_jk-1.2.30-httpd-2.2.3.so
一、负载均衡配置
配置步骤：
1、安装apache2.2.15
2、安装tomcat6.0.18
3、在apache2/conf下创建一个文件mod_jk.conf
mod_jk.conf
引用
#加载mod_jk Module
LoadModule jk_module modules/mod_jk.so
#指定 workers.properties文件路径
JkWorkersFile conf/workers.properties
#指定那些请求交给tomcat处理,”lbcontroller”为在workers.propertise里指定的负载分配控制器
JkMount /* lbcontroller
#JkMount /*.jsp lbcontroller
#JkMount /*.do lbcontroller
4、修改httpd.conf,增加下面一句代码
Include conf/mod_jk.conf
5、创建一个workers.properties文件
workers.properties
引用
#server 列表
worker.list = lbcontroller
#========tomcat1========
#ajp13 端口号，在tomcat下server.xml配置,默认8009
worker.tomcat1.port=8029
#tomcat的主机地址，如不为本机，请填写ip地址
worker.tomcat1.host=130.120.2.147
worker.tomcat1.type=ajp13
#server的加权比重，值越高，分得的请求越多
worker.tomcat1.lbfactor = 1
#========tomcat2========
#ajp13 端口号，在tomcat下server.xml配置,默认8009
worker.tomcat2.port=8019
#tomcat的主机地址，如不为本机，请填写ip地址
worker.tomcat2.host=130.120.2.147
worker.tomcat2.type=ajp13
#server的加权比重，值越高，分得的请求越多
worker.tomcat2.lbfactor = 1
#========controller,负载均衡控制器========
worker.lbcontroller.type=lb
#指定分担请求的tomcat
worker.lbcontroller.balanced_workers=tomcat1,tomcat2
worker.lbcontroller.sticky_session=1
6、修改tomcat sever.xml文件
server.xml
<Connector port=”8029″ protocol=”AJP/1.3″ redirectPort=”8443″ />
<Engine name=”Catalina” defaultHost=”localhost” jvmRoute=”tomcat1″>
AJP端口与workers.properties文件中对应的tomcat AJP端口
7、启动tomcat1，tomcat2,Apache2.2
8、访问一下系统检查一下是否配置成功
配置过程中可能会遇到下列问题：
问题1：
引用
Service Temporarily Unavailable
The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later.
解决方案：
引用
1、直接通过tomcat端口访问系统，访问成功，则问题出来apache配置文件，如mod_jk,workers.properties文件，如下面配置文件就存在一个问题。
worker.controller.type=lb
#指定分担请求的tomcat
worker.lbcontroller.balanced_workers=tomcat1,tomcat2
worker.lbcontroller.sticky_session=1
worker.list = lbcontroller
首先查看apache日志文件
mok_jk.log
引用
[Fri Oct 08 17:10:42.921 2010] [3900:812] [warn] jk_map.c (411): The attribute ‘worker.lbcontroller.balanced_workers’ is deprecated – please check the documentation for the correct replacement.
[Fri Oct 08 17:10:42.921 2010] [3900:812] [info] mod_jk.c (3189): mod_jk/1.2.30 initialized
[Fri Oct 08 17:10:42.984 2010] [3900:812] [warn] jk_map.c (411): The attribute ‘worker.lbcontroller.balanced_workers’ is deprecated – please check the documentation for the correct replacement.
[Fri Oct 08 17:10:42.984 2010] [3900:812] [info] mod_jk.c (3189): mod_jk/1.2.30 initialized
[Fri Oct 08 17:10:43.093 2010] [1876:5440] [warn] jk_map.c (411): The attribut
