Apache负载均衡之mod_proxy模块实现
实验环境：一台虚拟机，IP：192.168.1.117实验目的：学习mod_proxy的负载功能，实现Apache反代并且负载到后端两个tomcat。实验步骤：在/etc/httpd/conf.d目录下增加配置文件，实现Apache的负载均衡。# cd /etc/httpd/conf.d
# vim mod_proxy.conf
BalancerMember http://192.168.1.117:8080 loadfactor=1 route=TomcatA
BalancerMember http://192.168.1.117:9080 loadfactor=1 route=TomcatB
ProxySet lbmethod=byrequests
ProxyPass / balancer://lbcluser1/
ProxyPassReverse / balancer://lbcluser/
保存退出
在上面配置文件和ProxyPass / balancer://lbcluser1/ 的中间中添加如下,这样可以访问其status页面。
SetHander balancer-manager
ProxyPass !
Order allow,deny
Allow from all
即是下面配置， # vim mod_proxy.conf
BalancerMember http://192.168.1.117:8080 loadfactor=1 route=TomcatA
BalancerMember http://192.168.1.117:9080 loadfactor=1 route=TomcatB
ProxySet lbmethod=byrequests
SetHander balancer-manager
ProxyPass !
Order allow,deny
Allow from all
ProxyPass / balancer://lbcluster1/
ProxyPassReverse / balancer://lbcluster/
保存退出之后
# httpd -t
# service httpd restart
下面在tomcat下创建test测试页
现在两个tomcat上做测试页，即在/usr/local/tomcatA/webapps/目录下
创建# mkdir -pv ./test/WEB-INF/{classes,lib},并且在test目录下穿件文件
# vim index.jsp
<%@ page language="java" %>
TomcatA
TomcatA. .just a test page
<% session.setAttribute("changyu.com","changyu.com"); %>
Session ID<%= session.getId() %>
Created on<%= session.getCreationTime() %>
同理在tomcatB同位置处
演示效果，在TomcatB上某context中（如/test），提供如下页面
<%@ page language="java" %>
TomcatB
TomcatB.just a test page
<% session.setAttribute("changyu.com","changyu.com"); %>
Session ID<%= session.getId() %>
Created on<%= session.getCreationTime() %>
还有一步就是在/usr/local/tomcat{1,2}/webpapps/test/WEB-INF/的目录下加一个web.xml文件并且在其任意位置添加。
对于tomcatA来说
# cp ./web.xml /usr/local/tomcatA/webapps/test/WEB-INF/
# cd /usr/local/tomcatA/webapps/test/WEB-INF/
# ls
classeslibweb.xml
#
# vim web.xml //任意位置加入下信息
对于tomcatB来说
# cp ./web.xml /usr/local/tomcatA/webapps/test/WEB-INF/
# cd /usr/local/tomcatB/webapps/test/WEB-INF/
# ls
classeslibweb.xml
# vim web.xml //任意位置加入下信息。
分别重新启动。
# ./catalina.sh stop
Using CATALINA_BASE: /usr/local/tomcatB
Using CATALINA_HOME: /usr/local/tomcatB
Using CATALINA_TMPDIR: /usr/local/tomcatB/temp
Using JRE_HOME: /opt/jdk1.7.0_71/
Using CLASSPATH: /usr/local/tomcatB/bin/bootstrap.jar:/usr/local/tomcatB/bin/tomcat-juli.jar
# ./catalina.sh start
Using CATALINA_BASE: /usr/local/tomcatB
Using CATALINA_HOME: /usr/local/tomcatB
Using CATALINA_TMPDIR: /usr/local/tomcatB/temp
Using JRE_HOME: /opt/jdk1.7.0_71/
Using CLASSPATH: /usr/local/tomcatB/bin/bootstrap.jar:/usr/local/tomcatB/bin/tomcat-juli.jar
Tomcat started.
#
重新启动，并且访问http://192.168.1.117/test
刷新页面
将上面test应用定义成集群会话管理器，将下面文件拷贝到两个文件中
<cluster classname="org.apache.catalina.ha.tcp.SimpleTcpCluster" [="" font]
channelSendOptions="8">
<manager classname="org.apache.catalina.ha.session.DeltaManager" [="" font]
expireSessionsOnShutdown="false"
notifyListenersOnReplication="true"/>
<membership classname="org.apache.catalina.tribes.membership.McastService" [="" font]
address="228.0.0.4"
port="45564"
frequency="500"
dropTime="3000"/>
<receiver classname="org.apache.catalina.tribes.transport.nio.NioReceiver" [="" font]
address="auto"
port="4000"
autoBind="100"
selectorTimeout="5000"
maxThreads="6"/>
<valve classname="org.apache.catalina.ha.tcp.ReplicationValve" [="" font]
filter=""/>
<deployer classname="org.apache.catalina.ha.deploy.FarmWarDeployer" [="" font]
tempDir="/tmp/war-temp/"
deployDir="/tmp/war-deploy/"
watchDir="/tmp/war-listen/"
watchEnabled="false"/>
之后再次访问，会话保持
刷新一下，不难发现SessionID 没有变化。
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