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Apache和tomcat負載均衡配置mod_jk

1. 操作系統(tǒng)

RedHat Linux AS 4

2. 所需軟件

httpd-2.2.4.tar.gz

jakarta-tomcat-5.0.28.tar.gz 

tomcat-connectors-1.2.25-src.tar.gz

j2sdk-1_4_2_15-linux-i586-rpm.bin

備注：下載時將所需軟件包文件保存在/usr/local目錄下

3. 安裝步驟

   先安裝JDK和TOMCAT；

A 安裝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

將Listen 80 修改為Listen :80

將ServerName 修改為ServerName :80

# cd /usr/local/apache/bin/

# ./apachectl configtest

若顯示Syntax ok則表明安裝成功

#./apachectl start

啟動apache服務，訪問本機80端口，查看端口是否正常

# ./apachectl stop

關閉服務

備注：prefix定義apache的安裝路徑

B 安裝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 系統(tǒng)整合

#vi /usr/local/apache/conf/httpd.conf

在文件最末尾加上如下語句

# 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
<Connector　port="8009" 
protocolHandlerClassName="org.apache.jk.server.JkCoyoteHandler"  
redirectPort="8443" protocol="AJP/1.3" />
在120行左右加入如下語句
<Engine name="Catalina" defaultHost="localhost" jvmRoute="tomcat1"></Engine>
若第二臺tomcat，將jvmRoute的修改為tomcat2

集群配置：

將兩中tomcat服務器的/usr/local/tomcat/conf/server.xml中<Cluster>元素的注澤去掉。

至此，系統(tǒng)已經(jīng)整個完畢
啟動apache和tomcat服務
# /usr/local/apache/bin/apachectl start
#/usr/local/tomcat/bin/catalina.sh start

設置自動啟動：
將如下內容添加至/etc/rc.d/rc.local文件末尾，以便系統(tǒng)啟動后開啟apache,tomcat服務
/usr/local/tomcat/bin/catalina.sh start
/usr/local/apache/bin/apachectl start