最近由于工作需要，公司需要部署 tomcat 集群，忙活了几天，终于配置了好了，做个笔记以后备用。
1. 下载 apache2 源码 http2.4.6
2. 配置 apache2
./configure --prefix=/usr/local/apache2 --enable-modules=shared --enable-mods-shared=all \
--enable-proxy --enable-proxy-connect --enable-proxy-ftp --enable-proxy-http \
--enable-proxy-ajp --enable-proxy-balancer --enable-rewrite \
--with-apr=/usr/local/apr \
--with-apr-util=/usr/local/apr-util/ \
--with-pcre=/usr/local/pcre
其中 apr ,apr-util, pcre 是安装依赖包，需要提前安装
3. 安装 apache2
root@qlserver03:/home/ryanwang/http2.4.6# make && make install
4 配置 load balance
修改 httpd.conf，文件末尾插入如下内容
ProxyRequests Off
<Proxy balancer://mycluster>
BalancerMember :8080 loadfactor=1 route=jvm1
BalancerMember :8080 loadfactor=1 route=jvm2
</Proxy>
ProxyPass / balancer://mycluster/
正向代理需要关闭，主要是为了安全，“ProxyPass / balancer://mycluster/”
表示所有请求都交给 mycluster 来处理。
5 配置 tomcat7
修改 tomcat/conf/server.xml
<!-- You should set jvmRoute to support load-balancing via AJP ie :
<Engine defaultHost="localhost" jvmRoute="jvm1">
<Engine defaultHost="localhost">-->
<Engine defaultHost="localhost" jvmRoute="jvm1">
另外一台服务器配置成 jvmRoute="jvm2"
6 应用的web.xml 文件需要增加一个元素 <distributable/>
到此 tomcat集群load balance 已经配置完成。下面配置 session 复制
<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"
channelSendOptions="8">
<Manager className="org.apache.catalina.ha.session.BackupManager"
expireSessionsOnShutdown="false"
notifyListenersOnReplication="true"
mapSendOptions="6"/>
<Channel className="org.apache.catalina.tribes.group.GroupChannel">
<Membership className="org.apache.catalina.tribes.membership.McastService"
address="228.0.0.4"
port="45564"
frequency="500"
dropTime="3000"/>
<Receiver className="org.apache.catalina.tribes.transport.nio.NioReceiver"
address="192.168.1.202"
port="4000"
autoBind="100"
selectorTimeout="5000"
maxThreads="6"/>
<Sender className="org.apache.catalina.tribes.transport.ReplicationTransmitter">
<Transport className="org.apache.catalina.tribes.transport.nio.PooledParallelSender"/>
</Sender>
<Interceptor className="org.apache.catalina.tribes.group.interceptors.TcpFailureDetector"/>
<Interceptor className="org.apache.catalina.tribes.group.interceptors.MessageDispatch15Interceptor"/>
</Channel>
<Valve className="org.apache.catalina.ha.tcp.ReplicationValve"
filter=""/>
<Valve className="org.apache.catalina.ha.session.JvmRouteBinderValve"/>
<Deployer className="org.apache.catalina.ha.deploy.FarmWarDeployer"
tempDir="/tmp/war-temp/"
deployDir="/tmp/war-deploy/"
watchDir="/tmp/war-listen/"
watchEnabled="false"/>
<ClusterListener className="org.apache.catalina.ha.session.JvmRouteSessionIDBinderListener"/>
<ClusterListener className="org.apache.catalina.ha.session.ClusterSessionListener"/>
</Cluster>
其中修改把 manager元素的
<Manager className="org.apache.catalina.ha.session.DeltaManager"
修改为
<Manager className="org.apache.catalina.ha.session.BackupManager"
表示只有相同应用的tomcat之间才复制session。
<Receiver className="org.apache.catalina.tribes.transport.nio.NioReceiver"
address="192.168.1.202"
port="4000"
autoBind="100"
selectorTimeout="5000"
maxThreads="6"/>
修改 receiver IP 地址和端口。