tomcat 之 httpd session stiky
# 注释中心主机 [root@nginx ~]# vim /etc/httpd/conf/httpd.conf #DocumentRoot "/var/www/html" #：配置虚拟主机 [root@nginx ~]# vim /etc/httpd/conf.d/tomcat.conf <VirtualHost *:80> ServerName node1.magedu.com ProxyRequests Off ProxyVia On ProxyPreserveHost On ProxyPass / balancer://lbtomcats/ ProxyPassReverse / balancer://lbtomcats/ </VirtualHost> <Proxy balancer://lbtomcats> BalancerMember http://node1.magedu.com:8080 loadfactor=1 BalancerMember http://node2.magedu.com:8080 loadfactor=2 </Proxy> #：分别配置tomcat [root@node1 ~]# vim /usr/local/tomcat/conf/server.xml <Engine name="Catalina" defaultHost="node1.magedu.com" jvmRoute="Tomcat1"> [root@node2 ~]# vim /usr/local/tomcat/conf/server.xml <Engine name="Catalina" defaultHost="node2.magedu.com" jvmRoute="Tomcat2"> #观察结果是轮询的
#：使用session粘性 [root@nginx ~]# vim /etc/httpd/conf.d/tomcat.conf Header add Set-Cookie "ROUTEID=.%{BALANCER_WORKER_ROUTE}e; path=/" env=BALANCER_ROUTE_CHANGED <VirtualHost *:80> ServerName node1.magedu.com ProxyRequests Off ProxyVia On ProxyPreserveHost On ProxyPass / balancer://lbtomcats/ ProxyPassReverse / balancer://lbtomcats/ </VirtualHost> <Proxy balancer://lbtomcats> BalancerMember http://node1.magedu.com:8080 loadfactor=1 route=Tomcat1 BalancerMember http://node2.magedu.com:8080 loadfactor=2 route=Tomcat2 ProxySet stickysession=ROUTEID </Proxy>
#
发现Session不变了，一直找的同一个Tomcat服务器
#：api [root@nginx ~]# vim /etc/httpd/conf.d/tomcat.conf <VirtualHost *:80> ServerName node1.magedu.com ProxyRequests Off ProxyVia On ProxyPreserveHost On ProxyPass / balancer://lbtomcats/ ProxyPassReverse / balancer://lbtomcats/ </VirtualHost> <Proxy balancer://lbtomcats> BalancerMember ajp://node1.magedu.com:8009 loadfactor=1 route=Tomcat1 BalancerMember ajp://node2.magedu.com:8009 loadfactor=2 route=Tomcat2 ProxySet stickysession=ROUTEID </Proxy>
虽然，上面的做法实现客户端在一段时间内找同一台Tomcat，从而避免切换后导致的Session丢失。但是如果
Tomcat节点挂掉，那么Session依旧丢失。
假设有A、B两个节点，都将Session持久化。如果Tomcat A服务下线期间用户切换到了Tomcat B上，就获得了Tomcat B的Session，就算持久化Session的Tomcat A上线了，也没用了。
