http://502245466.blog.51cto.com/7559397/1304050 Apache+Tomcat建構Tomcat負載均衡叢集(keepalived)
http://502245466.blog.51cto.com/7559397/1304712Apache代理Tomcat實作session共享建構網上商城系統
http://502245466.blog.51cto.com/7559397/1302343 LVS+Keepalived實作高可用負載均衡
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192.168.1.123/192.168.1.121為後端tomcat，mysql在192.168.1.121上，192.168.1.123沒有mysql。啟動121的mysql，121/123http不用啟動
192.168.1.122/192.168.1.23上安裝apache和keepalived
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配置apache反向代理tomcat時的mod_proxy.conf内容
vim /usr/local/apache/conf/extra/mod_proxy.conf
ProxyVia on
ProxyRequests Off
ProxyPreserveHost Off
<Proxy *>
Order allow,deny
Allow from all
</Proxy>
ProxyPass / ajp://192.168.1.123:8009/（或者）
ProxyPassReverse / ajp://192.168.1.123:8009/
配置apache負載均衡時的mod_proxy.conf内容
ProxyVia Off
<Proxy balancer://nba>
BalancerMember http://192.168.1.121:8080 loadfactor=1
BalancerMember http://192.168.1.123:8080 loadfactor=1
ProxySet lbmethod=bytraffic
ProxyPass / balancer://nba/ stickysession=JSESSIONID
ProxyPassReverse / balancer://nba/
配置Apache使用mod_jk子產品實作代理
配置apache反向代理tomcat時的mod_jk.conf内容
JkWorkersFile /tomcat/conf/workers.properties
JkLogFile /var/log/mod_jk.log
JkLogLevel info
JkMount /* tomcat1
另：配置apache反向代理tomcat時的workers.properties内容
worker.list=tomcat1
worker.tomcat1.port=8009
worker.tomcat1.host=192.168.1.121
worker.tomcat1.type=ajp13
worker.tomcat1.lbfactor=1
配置Apache使用mod_jk子產品實作負載均衡
配置apache負載均衡tomcat時的mod_jk.conf内容
JkMount /* controller
另：配置apache負載均衡tomcat時的workers.properties内容
worker.list=controller
#========tomcat1========
#========tomcat2========
worker.tomcat2.port=8009
worker.tomcat2.host=192.168.1.123
worker.tomcat2.type=ajp13
worker.tomcat2.lbfactor=1
#========controller=======
worker.controller.type=lb
worker.controller.balance_workers=tomcat1,tomcat2
worker.controller.sticky_session=1
測試jsp内容
<%@ page language="java" %>
<html>
<head><title>Tomcat1</title></head>
<body>
<h1><font color="red">Tomcat1 </font></h1>
<table align="centre" border="1">
<tr>
<td>Session ID</td>
<% session.setAttribute("abc","abc"); %>
<td><%= session.getId() %></td>
</tr>
<td>Created on</td>
<td><%= session.getCreationTime() %></td>
</table>
</body>
</html>
解決ProxySet: unknown lbmethod lbmethod=bytraffic; balancer://nba
httpd.conf裡有下面2個選項
LoadModule lbmethod_byrequests_module modules/mod_lbmethod_byrequests.so
LoadModule slotmem_shm_module modules/mod_slotmem_shm.so
常用指令：
ps aux|grep java
netstat -an|grep 80
killall -9 httpd
cd /usr/local/apache/bin/
./startup.sh;tail -f /tomcat/logs/catalina.out
![Apache2+tomcat6叢集+session同步[圖]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)