测试环境
host1 192.168.30.1host2 192.168.30.2
准备环境
在host1和host2的tomcat目录下（/var/lib/tomcat/webapps/）部署cas.war
高可用方案
在cas/WEB-INF/classes下新建文件ehcache-replicated.xml:
<ehcache name="ehCacheTicketRegistryCache"
updateCheck="false"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="http://ehcache.org/ehcache.xsd">
<diskStore path="java.io.tmpdir/cas"/>
<!-- Automatic Peer Discovery
<cacheManagerPeerProviderFactory
class="net.sf.ehcache.distribution.RMICacheManagerPeerProviderFactory"
properties="peerDiscovery=automatic, multicastGroupAddress=230.0.0.1, multicastGroupPort=4446, timeToLive=32"
propertySeparator="," />
-->
<!-- Manual Peer Discovery -->
<!-- 注意，这里配置远程ehcache主机的ip -->
<cacheManagerPeerProviderFactory
class="net.sf.ehcache.distribution.RMICacheManagerPeerProviderFactory"
properties="peerDiscovery=manual,
rmiUrls=//remotehost:40001/org.jasig.cas.ticket.ServiceTicket|//remotehost:40001/org.jasig.cas.ticket.TicketGrantingTicket" />
<!-- 这里配置本机ehcache的port -->
<cacheManagerPeerListenerFactory
class="net.sf.ehcache.distribution.RMICacheManagerPeerListenerFactory"
properties="port=40001" />
</ehcache>
备份原来的/cas/WEB-INF/spring-configuration/ticketRegistry.xml，重新建一个ticketRegistry.xml，内容如下：
<?xml version="1.0" encoding="UTF-8"?>
<!--
Licensed to Jasig under one or more contributor license
agreements. See the NOTICE file distributed with this work
for additional information regarding copyright ownership.
Jasig licenses this file to you under the Apache License,
Version 2.0 (the "License"); you may not use this file
except in compliance with the License. You may obtain a
copy of the License at the following location:
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied. See the License for the
specific language governing permissions and limitations
under the License.
-->
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.1.xsd">
<description>
Configuration for the EhCache TicketRegistry which stores the tickets in a distributed EhCache and cleans
them out as specified intervals.
</description>
<bean id="cacheManager" class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean">
<property name="configLocation" value="classpath:ehcache-replicated.xml" />
<property name="shared" value="false" />
<property name="cacheManagerName" value="ticketRegistryCacheManager" />
</bean>
<bean id="ticketRegistry" class="org.jasig.cas.ticket.registry.EhCacheTicketRegistry"
p:serviceTicketsCache-ref="serviceTicketsCache"
p:ticketGrantingTicketsCache-ref="ticketGrantingTicketsCache" />
<bean id="abstractTicketCache" class="org.springframework.cache.ehcache.EhCacheFactoryBean" abstract="true">
<property name="cacheManager" ref="cacheManager" />
<property name="diskExpiryThreadIntervalSeconds" value="0" />
<property name="diskPersistent" value="false" />
<property name="eternal" value="false" />
<property name="maxElementsInMemory" value="10000" />
<property name="maxElementsOnDisk" value="0" />
<property name="memoryStoreEvictionPolicy" value="LRU" />
<property name="overflowToDisk" value="false" />
<property name="bootstrapCacheLoader">
<ref local="ticketCacheBootstrapCacheLoader"/>
</property>
</bean>
<bean id="serviceTicketsCache" class="org.springframework.cache.ehcache.EhCacheFactoryBean" parent="abstractTicketCache">
<description>
Service Tickets (ST) and Proxy Tickets are only valid for short amount of time (default is 10 seconds), and
most often are removed from the cache when the ST is validated. The ST cache must be replicated quickly
since validation is expected within a few second after its creation. The CAS instance validating the ST may
not be one that created the ST, since validation is a back-channel service-to-CAS call that is not aware of
user session affinity. Synchronous mode is used to ensure all CAS nodes can validate the ST.
</description>
<property name="cacheName" value="org.jasig.cas.ticket.ServiceTicket" />
<property name="cacheEventListeners">
<ref local="ticketRMISynchronousCacheReplicator"/>
</property>
<!--
The maximum number of seconds an element can exist in the cache without being accessed.
The element expires at this limit and will no longer be returned from the cache.
The default value is 0, which means no TTI eviction takes place (infinite lifetime).
-->
<property name="timeToIdle" value="0" />
<!--
The maximum number of seconds an element can exist in the cache regardless of use.
The element expires at this limit and will no longer be returned from the cache.
The default value is 0, which means no TTL eviction takes place (infinite lifetime).
-->
<property name="timeToLive" value="300" />
</bean>
<bean id="ticketGrantingTicketsCache" class="org.springframework.cache.ehcache.EhCacheFactoryBean" >
<description>
Ticket Granting Tickets (TGT) are valid for the lifetime of the SSO Session. They become invalid either
by expiration policy (default 2 hours idle, 8 hours max) or by explicit user sign off via /cas/login.
The TGT cache can be replicated slowly because TGT are only manipulated via web user started operations
(mostly grant service ticket) and thus benefit of web session affinity.
</description>
<property name="cacheName" value="org.jasig.cas.ticket.TicketGrantingTicket" />
<property name="cacheEventListeners">
<ref local="ticketRMIAsynchronousCacheReplicator"/>
</property>
<!--
The maximum number of seconds an element can exist in the cache regardless of use.
The element expires at this limit and will no longer be returned from the cache.
The default value is 0, which means no TTL eviction takes place (infinite lifetime).
For this sample configuration, 2 hours of inactivity before ticket granting tickets
are expired automatically
-->
<property name="timeToIdle" value="7201" />
<!--
The maximum number of seconds an element can exist in the cache without being accessed.
The element expires at this limit and will no longer be returned from the cache.
The default value is 0, which means no TTI eviction takes place (infinite lifetime).
-->
<property name="timeToLive" value="0" />
</bean>
<bean id="ticketRMISynchronousCacheReplicator" class="net.sf.ehcache.distribution.RMISynchronousCacheReplicator">
<constructor-arg name="replicatePuts" value="true"/>
<constructor-arg name="replicatePutsViaCopy" value="true"/>
<constructor-arg name="replicateUpdates" value="true"/>
<constructor-arg name="replicateUpdatesViaCopy" value="true"/>
<constructor-arg name="replicateRemovals" value="true"/>
</bean>
<bean id="ticketRMIAsynchronousCacheReplicator" class="net.sf.ehcache.distribution.RMIAsynchronousCacheReplicator" parent="ticketRMISynchronousCacheReplicator">
<constructor-arg name="replicationInterval" value="10000"/>
<constructor-arg name="maximumBatchSize" value="100"/>
</bean>
<bean id="ticketCacheBootstrapCacheLoader" class="net.sf.ehcache.distribution.RMIBootstrapCacheLoader">
<constructor-arg name="asynchronous" value="true"/>
<constructor-arg name="maximumChunkSize" value="5000000"/>
</bean>
</beans>
在/cas/WEB-INF/lib下加入jars:
cas-server-integration-ehcache-3.5.2.1.jarehcache-core.jar
重启两台主机的tomcat，done!
如果是源码编译
在cas-server-webapp的pom.xml中加入：
<dependency>
<groupId>org.jasig.cas</groupId>
<artifactId>cas-server-integration-ehcache</artifactId>
<version>${project.version}</version>
</dependency>
然后重新打包，done!
相关资源：CAS负载均衡实战
