Apache和tomcat负载均衡

Apache和tomcat负载均衡配置mod_jk
1. 操作系统
RedHat Linux AS 4
2. 所需软件
httpd-2.2.4.tar.gz
jakarta-tomcat-5.0.28.tar.gz
tomcat-connectors-1.2.25-src.tar.gz
备注：下载时将所需软件包文件保存在/usr/local目录下
3. 安装步骤
先安装JDK和TOMCAT；
A 安装Apache
# cd /usr/local/
# tar xvfz httpd-2.2.4.tar.gz
# cd httpd-2.2.4
#./configure --prefix=/usr/local/apache --enable-module=so
# make
# make install
# cd /usr/local/apache/conf
# vi ./httpd.conf
将Listen 80 修改为Listen :80
将ServerName 修改为ServerName :80
# cd /usr/local/apache/bin/
# ./apachectl configtest
若显示Syntax ok则表明安装成功
#./apachectl start
启动apache服务，访问本机80端口，查看端口是否正常
# ./apachectl stop
关闭服务
备注：prefix定义apache的安装路径
B 安装JK
#cd /usr/local/
# tar xzvf tomcat-connectors-1.2.25-src.tar.gz
#cd tomcat-connectors-1.2.25-src /jk/native
#chmod 755 buildconf.sh
#./buildconf.sh
#./configure --with-apxs=/usr/local/apache/bin/apxs
#make
#make install
#cd /usr/local/tomcat-connectors-1.2.25-src/jk/native/apache-2.0/
#cp mod_jk.so /usr/local/apache/modules/
C 系统整合
#vi /usr/local/apache/conf/httpd.conf
在文件最末尾加上如下语句
# Load mod_jk
LoadModule jk_module modules/mod_jk.so
# Configure mod_jk
JkWorkersFile conf/workers.properties
JkLogFile logs/mod_jk.log
JkLogLevel info
JkMount /* loadbalancer
增加workers.properties文件:
# vi /usr/local/apache/conf/workers.properties
#
# workers.properties
#
# In Unix, we use forward slashes:
ps=/
# list the workers by name
worker.list=tomcat1, tomcat2, loadbalancer
# ------------------------
# First tomcat server
# ------------------------
worker.tomcat1.port=8009
worker.tomcat1.host=127.0.0.1
worker.tomcat1.type=ajp13
# Specify the size of the open connection cache.
#worker.tomcat1.cachesize
#
# Specifies the load balance factor when used with
# a load balancing worker.
# Note:
# ----> lbfactor must be > 0
# ----> Low lbfactor means less work done by the worker.
worker.tomcat1.lbfactor=100
# ------------------------
# Second tomcat server
# ------------------------
worker.tomcat2.port=8009
worker.tomcat2.host=192.168.1.34
worker.tomcat2.type=ajp13
# Specify the size of the open connection cache.
#worker.tomcat2.cachesize
#
# Specifies the load balance factor when used with
# a load balancing worker.
# Note:
# ----> lbfactor must be > 0
# ----> Low lbfactor means less work done by the worker.
worker.tomcat2.lbfactor=100
# ------------------------
# Load Balancer worker
# ------------------------
# The loadbalancer (type lb) worker performs weighted round-robin
# load balancing with sticky sessions.
# Note:
# ----> If a worker dies, the load balancer will check its state
# once in a while. Until then all work is redirected to peer
# worker.
worker.loadbalancer.type=lb
worker.loadbalancer.balanced_workers=tomcat1, tomcat2
#
# END workers.properties
#
#vi /usr/local/tomcat/conf/server.xml
protocolHandlerClassName="org.apache.jk.server.JkCoyoteHandler"
redirectPort="8443" protocol="AJP/1.3" />
在120行左右加入如下语句

若第二台tomcat，将jvmRoute的修改为tomcat2
集群配置：
将两中tomcat服务器的/usr/local/tomcat/conf/server.xml中元素的注泽去掉。
至此，系统已经整个完毕
启动apache和tomcat服务
# /usr/local/apache/bin/apachectl start
#/usr/local/tomcat/bin/catalina.sh start
设置自动启动：
将如下内容添加至/etc/rc.d/rc.local文件末尾，以便系统启动后开启apache,tomcat服务
/usr/local/tomcat/bin/catalina.sh start
/usr/local/apache/bin/apachectl start