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RedHat linux+apache+tomcat+mod_jk 负载均衡安装说明

1. 操作系统

RedHat Linux 9.0

2. 所需软件

Apache 2.0.54 
http://apache.freelamp.com/httpd/httpd-2.0.54.tar.gz

Tomcat5.5.9
http://apache.justdn.org/jakarta/tomcat-5/v5.5.9/bin/jakarta-tomcat-5.5.9.tar.gz

Mod_jk 1.2.14
http://apache.justdn.org/jakarta/tomcat-connectors/jk/source/jk-1.2.14/jakarta-tomcat-connectors-1.2.14-src.tar.gz

Jdk 1_5_0_04
http://java.sun.com/j2se/1.5.0/download.jsp

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

A 安装JDK

# cd /usr/local/
# chmod +x jdk-1_5_0_04-linux-i586-rpm.bin
# ./jdk-1.5.0_04-linux-i586-rpm.bin
# cd /usr/java/
# ln -s /usr/java/jdk-1_5_0_04 /usr/local/java
# vi /etc/profile
#添加如下内容

JAVA_HOME=/usr/local/java/
CLASSPATH=/usr/local/java/lib/dt.jar:/usr/local/java/lib/tools.jar
PATH=/usr/local/java/bin:$PATH
export PATH JAVA_HOME CLASSPATH

B 安装Apache

# cd /usr/local/
# tar xvfz httpd-2.0.54.tar.gz
# cd httpd-2.0.54
#./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

在DirectoryIndex中添加 index.jsp
# 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

C 安装Tomcat

  # cd /usr/local/
  # tar xvfz jakarta-tomcat-5.5.9.tar.gz
  # ln –s /usr/local/jakarta-tomcat-5.5.9　/usr/local/tomcat
  # vi /usr/local/tomcat/bin/catalina.sh

      JAVA_HOME=/usr/local/java

 启动服务后，访问本机8080端口，查看端口是否正常

# /usr/local/tomcat/bin/startup.sh /startup.bat

  关闭服务

# /usr/local/tomcat/bin/shutdown.sh /shutdown.bat

D 安装JK

#cd /usr/local/
# tar xzvf jakarta-tomcat-connectors-1.2.14-src.tar.gz
#cd jakarta-tomcat-connectors-1.2.14-src/jk/native
#chmod 755 buildconf.sh
#./buildconf.sh
#./configure --with-apxs=/usr/local/apache/bin/apxs
#make
#make install
#cd /usr/local/ jakarta-tomcat-connectors- jk1.2.14-src/jk/native/apache-2.0/
#cp mod_jk.so /usr/local/apache/modules/

E 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 /*.jsp loadbalancer
JkMount /servlet/* loadbalancer
JkMount /application/* loadbalancer

#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
<Connector　port="8009" 
protocolHandlerClassName="org.apache.jk.server.JkCoyoteHandler"  
redirectPort="8443" protocol="AJP/1.3" />
在120行左右加入如下语句
<Engine name="Standalone" defaultHost="localhost" jvmRoute="tomcat1"></Engine>
若第二台tomcat，将jvmRoute的修改为tomcat2
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
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