CentOS 7 tomcat 7.0.54 的功能实现及详解

[toc]

一、 jdk 安装配置

 # yum install java-1.8.0-openjdk-devel (依赖的java-1.8.0-openjdk,java-1.8.0-openjdk,headless也会被安装 )
# alternatives -h
# vim /etc/profile.d/java.sh
   # 加入 export JAVA_HOME=/usr
# . /etc/profile.d/java.sh 
# printenv 查看环境变量
#用rpm包安装 
 
# wget ftp://172.16.0.1/pub/Sources/7.x86_64/jdk/jdk-8u25-linux-x64.rpm
# rpm -ivh jdk-8u25-linux-x64.rpm
# rpm -ql jdk1.8.0_25-1.8.0_25-fcs
# cd /usr/java/default
# vim /etc/profile.d/javad.sh
JAVA_HOME=/usr/java/latest
PATH=$JAVA_HOME/bin:$PATH
export JAVA_HOME PATH
# . /etc/profile.d/javad.sh 
# java -version

tomcat:运行于JDK之上，表现为一个独立而完整的java进程，可与用户交互的web服务器
使用Java语言编写
Tomcat的核心组件:server.xml，其配置的格式为

 <Server>
<Serivce>
<connector/>
<connecotr/>
...
<Engine>
<Host>
<Context/>
<Context/>
</Host>
<Host>
...
</Host>
...
</Engine>
</service>
</Server>

说明：

顶级组件:Server
服务类组件:Service
类连接类组件:http,https,ajp t
容器类:Engine,Host,Context
被嵌套类:value,logger,realm,loader,manager
集群类组件:listener,cluster,…
cluster,…

二、Tomcat安装配置

1、安装tomcat:

a、二进制格式安装

 # tar xvf apache-tomcat-VERSION.tar.gz -C /usr/local/ 
# cd /usr/local/ 
# ln -sv apache-tomcat-VERSION tomcat 
#vim /etc/profile.d/tomcat.sh 
export CATALINA_BASE=/usr/local/tomcat 
export PATH=$CATALINA_BASE/bin:$PATH
# . /etc/profile.d/tomcat.sh

b、yum源安装

 # yum -y install tomcat-webapps tomcat-docs-webapp tomcat-admin-webapps tomcat tomcat-lib
# 安装完后可以使用命令
# systemctl start tomcat && ss -tnl

启动tomcat服务并且查看8080端口是否启用
在浏览器中进行测试 http://172.16.254.248:8080/

2、tomcat程序目录结构

bin:脚本及启动时用到的类
conf:配置文件目录
lib:库文件，java类库
logs:日志文件目录
temp:临时文件目录
webapps:webapp的默认目录
work:工作目录

3、tomcat的配置文件说明

server.xml：主配置文件;
web.xml：每个webapp只有部署后才能被访问，它的部署方式通过由web.xml进行定义，其存位置为WEB-INF/目录中，此文件为所有的webapps提供默认配置;
context.xml:每个web都可专用的配置文件，它通常由专用的配置文件context.xml来定义，其存放位置为WEB-INF/目录中，此文件为所有的webapps提供默认配置;
tomcat-users.xml:用户的账号和文件;
catalina.policy:当使用security选项启动tomcat时，用于为tomcat设置安全策略；
catalina.propreteis:java物定义文件，用于设定类加载器路径，以及一些与JVM高估相关参数；
logging.properties:日志系统相关的配置 ;

4、tomcat-users.xml配置

 # vim /etc/tomcat/tomcat-users.xml

在段中加入以五内容

 <role rolename="manager-gui"/>
<user username="centos" password="centos" roles="manager-gui"/>
<role rolename="admin-gui"/>
<user username="centos" password="centos" roles="admin-gui"/>

重启服务后并重新访问http://172.16.254.248:8080/

点Server Status、Manager App、 Host Manager时输入用户名centos密码centos进行访问

5、提供一测试类应用，并冷部署；

 #mkdir -pv /usr/share/tomcat/webapps/test/{classes,lib,WEB-INF}

 # vim /usr/share/tomcat/webapps/test/index.jsp 
 <%@ page language="java" %>
 <%@ page import="java.util.*" %>
 <html>
 <head>
<title> Test Page </title>
</head>
<body>
<% out.println("hellow world");
%>
  </body>
   </html>
重新访问http://172.16.254.248:8080/test/时会显示hellow world

6、nginx + tomcat cluster

用nginx 反代两台tomcat主机，cluster(172.16.254.248[nginx]) ,node1(172.16.251.232[Tomcat A]),node2(172.16.251.74[Tomcat B])

 cluster# yum -y install nginx && systemctl start nginx 
# vim /etc/nginx/nginx.conf
# 在http段中加入
upstream tomcat {
server 172.16.251.232:8080;
server 172.16.251.74:8080;
}
# vim /etc/nginx/conf.d/default.conf
# 在location中加入 
proxy_pass http://tomcat/;
nod1    # mkdir -pv /usr/share/tomcat/webapps/test/{WEB-INF,classes,lib}

 # vim /usr/share/tomcat/pwebapps/test/index.jsp 
<%@ page language="java" %>
<html>
  <head><title>TomcatA</title></head>
  <body>
<h1><font color="red">TomcatA.rj.com</font></h1>
<table align="centre" border="1">
  <tr>
<td>Session ID</td>
<% session.setAttribute("magedu.com","magedu.com"); %>
<td><%= session.getId() %></td>
  </tr>
  <tr>
<td>Created on</td>
<td><%= session.getCreationTime() %></td>
 </tr>
</table>
  </body>
</html>
nod2    # mkdir -pv /usr/share/tomcat/webapps/test/{WEB-INF,classes,lib}

 # vim /usr/share/tomcat/pwebapps/test/index.jsp 
<%@ page language="java" %>
<html>
  <head><title>TomcatA</title></head>
  <body>
<h1><font color="red">TomcatB.rj.com</font></h1>
<table align="centre" border="1">
  <tr>
<td>Session ID</td>
<% session.setAttribute("magedu.com","magedu.com"); %>
<td><%= session.getId() %></td>
  </tr>
  <tr>
<td>Created on</td>
<td><%= session.getCreationTime() %></td>
 </tr>
</table>
  </body>
</html>

访问http://172.16.254.248/test/时效果如果下

7、 httpd(proxy_http_module) + tomcat cluster

 cluster#systemctl disable nginx && systemctl stop nginx
   # yum -y install httpd

 # vim /etc/httpd/conf.d/tomcat.conf 
<proxy balancer://tomcat>
BalancerMember http://172.16.251.232:8080
BalancerMember http://172.16.251.74:8080
ProxySet  lbmethod=byrequests
</proxy>
<VirtualHost *:80>
ServerName www.rj.com
ProxyVia On
ProxyRequests Off
ProxyPreserveHost On
<Proxy *>
Require all granted
</Proxy>
ProxyPass / balancer://tomcat/
ProxyPassReverse / balancer://tomcat/
<Location />
Require all granted
</Location>
</VirtualHost>

访问http://172.16.254.248/test/时效果如下

启用balancer管理接口

 cluster# vim /etc/httpd/conf.d/balancer-manager.conf 
<Location /balancer-manager>
Sethandler balancer-manager 
ProxyPass !
Require all granted 
</Location>

 `访问其管理接口http://172.16.254.248/balancer-manager效果如下`

8、 httpd(proxy_ajp_module)+tomcat cluster

 # cp /etc/httpd/conf.d/tomcat.conf /etc/httpd/conf.d/tomcat.conf.bak

 # vim /etc/httpd/conf.d/tomcat.conf 
<proxy balancer://tomcat>
BalancerMember ajp://172.16.251.232:8009
BalancerMember ajp://172.16.251.74:8009
ProxySet  lbmethod=byrequests
</proxy>
<VirtualHost *:80>
ServerName www.rj.com
ProxyVia On 
ProxyRequests Off 
ProxyPreserveHost On 
<Proxy *>
Require all granted 
</Proxy>
ProxyPass / balancer://tomcat/
ProxyPassReverse / balancer://tomcat/
<Location />
Require all granted 
</Location>
</VirtualHost>

访问http://172.16.254.248/test/时效果如下

三、常用组件配置

Server:代表tomcat instance, 即表现出一个Java进程：监听在8005端口，只接收“SHUTDOWN”；
各server监听的端口不能相同，因此，在同一物理主机启动多个实例时，需要个改其监听端口为不同的端口；

service：用于实现将一个或多个connector组件关联至一个engine组件；
Connector组件
负责接收请求，常见的有三类http/https/ajp:
进入tomcat的请求可分为两类；

(1)standalone:请求来自于客户端的反代理服务器：

nginx —> http connector —> tomcat
httpd(proxy_http_module) —> http connector —> tomcat
httpd(proxy_ajp_module) —> ajp connecetor —> tomcat

属性：

port=”8080”
protocol=”HTTP/1.1”
connectionTimeout=”20000”
address：监听的IP地址；默认为本机所有可用地址；
maxThreads：最大并发连接数，默认为150；
enableLookups：是否启用DNS查询功能；
acceptCount：等待队列的最大长度；
secure：
sslProtocol：

Engine组件：Servlet实例，即servlet引擎，其内部可以一个或多个host组件来定义站点；通常需要通过defaultHost来定义默认的虚拟主机；

属性：

name=
defaultHost=”localhost”
jvmRoute=

Host组件：位于engine内部用于接收请求并进行相应处理的主机或虚拟主机，示例：

 <Host name="localhost"  appBase="webapps"
unpackWARs="true" autoDeploy="true">
</Host>

常用属性说明：

(1) appBase：此Host的webapps的默认存放目录，指存放非归档的web应用程序的目录或归档的WAR文件目录路径；可以使用基于$CATALINA_BASE变量所定义的路径的相对路径；

(2) autoDeploy：在Tomcat处于运行状态时，将某webapp放置于appBase所定义的目录中时，是否自动将其部署至tomcat；

示例：

 <Host name="tc1.magedu.com" appBase="/appdata/webapps" unpackWARs="true" autoDeploy="true">
</Host>

 # mkdir -pv /appdata/webapps
# mkdir -pv /appdata/webapps/ROOT/{lib,classes,WEB-INF}

提供一个测试页即可；

四、tomcat cluster 升级为session cluster，使用deltaManager

配置node1,和node2

 node1# vim /etc/tomcat/server.xml

  <Engine name="Catalina" defaultHost="localhost" jvmRoute="TomcatA">
<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"
channelSendOptions="8">
<Manager className="org.apache.catalina.ha.session.DeltaManager"
expireSessionsOnShutdown="false"
notifyListenersOnReplication="true"/>
<Channel className="org.apache.catalina.tribes.group.GroupChannel">
<Membership className="org.apache.catalina.tribes.membership.McastService"
address="228.0.32.4"
port="45564"
frequency="500"
dropTime="3000"/>
<Receiver className="org.apache.catalina.tribes.transport.nio.NioReceiver"
address="192.168.254.130"
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>

 # scp /etc/tomcat/server.xml 172.16.251.74:/etc/tomcat/server.xml
# cp /etc/tomcat/web.xml /var/lib/tomcat/webapps/test/WEB-INF/

 # vim /var/lib/tomcat/webapps/test/WEB-INF/web.xml
在 <!--                       listings is enabled? [true]                    -->的后面加入
<distributable/>
# scp /var/lib/tomcat/webapps/test/WEB-INF/web.xml 172.16.251.74:/var/lib/tomcat/webapps/test/WEB-INF/
   node2# vim /etc/tomcat/server.xml 
更改  <Engine name="Catalina" defaultHost="localhost" jvmRoute="TomcatB">
address="172.16.251.74"
node1,2 #systemctl restart tomcat

进入页测试http://172.16.254.248/test/

五、cluster将会话保存至memcached中

node1,2需要的操作
将deltaManager的配置还原

   # cd /usr/share/tomcat/lib/
   # wget ftp://172.16.0.1/pub/Sources/7.x86_64/msm/* && rm -rf memcached-session-manager-tc8-1.8.3.jar
   # yum -y install memcached libmemcached 
   # systemctl start memcached 
   # sustemctl enable memcached
node1(tomcat1,memcached1)

  # memcached 1配置 
# vim /etc/tomcat/server.xml
# 修改 
<Engine name="Catalina" defaultHost="localhost" jvmRoute="rjTomcat1">
在Host段中添加
        <Context path="/test" docBase="test" reloadable="true">
<Manager className="de.javakaffee.web.msm.MemcachedBackupSessionManager"
memcachedNodes="n1:172.16.251.232:11211,n2:172.16.251.74:11211"
failoverNodes="n1"
requestUriIgnorePattern=".*\.(ico|png|gif|jpg|css|js)$"
transcoderFactoryClass="de.javakaffee.web.msm.serializer.javolution.JavolutionTranscoderFactory"
/>
</Context>
node2(tomcat,memcached2)
 # memcached 2配置 
<Engine name="Catalina" defaultHost="localhost" jvmRoute="rjTomcat2">
# 在Host段中添加
 <Context path="/test" docBase="test" reloadable="true">
<Manager className="de.javakaffee.web.msm.MemcachedBackupSessionManager"
memcachedNodes="n1:172.16.251.232:11211,n2:172.16.251.74:11211"
failoverNodes="n1"
requestUriIgnorePattern=".*\.(ico|png|gif|jpg|css|js)$"
transcoderFactoryClass="de.javakaffee.web.msm.serializer.javolution.JavolutionTranscoderFactory"
/>
</Context>

关于tomcat memcached session绑定配置详解地址

https://github.com/magro/memcached-session-manager/wiki/SetupAndConfiguration#configure-memcached-session-manager-as--context-manager
此时cluster将会话保存于memcached 中

访问http://172.16.254.248/test/效果如下

六、Tomcat的常用优化配置

（1）内存空间：

 #vim /etc/sysyconfig/tomcat 
JAVA_OPTS="-server -Xms -Xmx -XX:NewSize= -XX:MaxNewSize= -XX:PermSize= -XX:MaxPermSize="

-server:服务器模型
-Xms:堆内存初始化大小；
-Xmx:堆内存空间上限；
-XX:NewSize=:新生代空间初始化大小；
-XX:MaxNewSize=:新生代空间最大值；
-XX:PermSize=:持久代空间初始化大小；
-XX:MaxPermSize=:持久代空间最大值；

（2）线程池设置：

 <Connector port="8080" protocol="HTTP/1.1" connectionTimeout="200000" redirectPort="8443" />

常用属性：

maxThreads:最大线程数；
minSpareThreads:最小空闲线程数；
maxSpareThreads:最大空闲线程数；
acceptCount:等待队列的最大长度；
URIEnconding:URI地址编码格式，建议使用UTF-8；
enableLookups:是否启用dns解析，建议禁用；
compression:是否启用传输压缩机制，建议”on”;
compressionMinSize:启用压缩传输的数据流最小值，单位是字节；
compressableMimeType:定义启用压缩功能的MIME类型;
text/html,text/xml,text/css,text/javascript;

（3）禁用8005端口

 <Server port="-1" shutdown="SHUTDOWN"> 
Server="SOME STRING"

（4）隐藏版本信息

 <Connector port="8080" protocol="HTTP/1.1" connection Timeout="20000" redirectPort="8443" />
Server="SOME STRING"

	# yum install java-1.8.0-openjdk-devel (依赖的java-1.8.0-openjdk,java-1.8.0-openjdk,headless也会被安装 )
	# alternatives -h
	# vim /etc/profile.d/java.sh
	# 加入 export JAVA_HOME=/usr
	# . /etc/profile.d/java.sh
	# printenv 查看环境变量
	#用rpm包安装

	# wget ftp://172.16.0.1/pub/Sources/7.x86_64/jdk/jdk-8u25-linux-x64.rpm
	# rpm -ivh jdk-8u25-linux-x64.rpm
	# rpm -ql jdk1.8.0_25-1.8.0_25-fcs
	# cd /usr/java/default
	# vim /etc/profile.d/javad.sh
	JAVA_HOME=/usr/java/latest
	PATH=$JAVA_HOME/bin:$PATH
	export JAVA_HOME PATH
	# . /etc/profile.d/javad.sh
	# java -version

	<Server>
	<Serivce>
	<connector/>
	<connecotr/>
	...
	<Engine>
	<Host>
	<Context/>
	<Context/>
	</Host>
	<Host>
	...
	</Host>
	...
	</Engine>
	</service>
	</Server>

	# tar xvf apache-tomcat-VERSION.tar.gz -C /usr/local/
	# cd /usr/local/
	# ln -sv apache-tomcat-VERSION tomcat
	#vim /etc/profile.d/tomcat.sh
	export CATALINA_BASE=/usr/local/tomcat
	export PATH=$CATALINA_BASE/bin:$PATH
	# . /etc/profile.d/tomcat.sh

	# yum -y install tomcat-webapps tomcat-docs-webapp tomcat-admin-webapps tomcat tomcat-lib
	# 安装完后可以使用命令
	# systemctl start tomcat && ss -tnl

	<role rolename="manager-gui"/>
	<user username="centos" password="centos" roles="manager-gui"/>
	<role rolename="admin-gui"/>
	<user username="centos" password="centos" roles="admin-gui"/>

	# vim /usr/share/tomcat/webapps/test/index.jsp
	<%@ page language="java" %>
	<%@ page import="java.util.*" %>
	<html>
	<head>
	<title> Test Page </title>
	</head>
	<body>
	<% out.println("hellow world");
	%>
	</body>
	</html>
	重新访问http://172.16.254.248:8080/test/时会显示hellow world

	cluster# yum -y install nginx && systemctl start nginx
	# vim /etc/nginx/nginx.conf
	# 在http段中加入
	upstream tomcat {
	server 172.16.251.232:8080;
	server 172.16.251.74:8080;
	}
	# vim /etc/nginx/conf.d/default.conf
	# 在location中加入
	proxy_pass http://tomcat/;
	nod1 # mkdir -pv /usr/share/tomcat/webapps/test/{WEB-INF,classes,lib}

	# vim /usr/share/tomcat/pwebapps/test/index.jsp
	<%@ page language="java" %>
	<html>
	<head><title>TomcatA</title></head>
	<body>
	<h1><font color="red">TomcatA.rj.com</font></h1>
	<table align="centre" border="1">
	<tr>
	<td>Session ID</td>
	<% session.setAttribute("magedu.com","magedu.com"); %>
	<td><%= session.getId() %></td>
	</tr>
	<tr>
	<td>Created on</td>
	<td><%= session.getCreationTime() %></td>
	</tr>
	</table>
	</body>
	</html>
	nod2 # mkdir -pv /usr/share/tomcat/webapps/test/{WEB-INF,classes,lib}

	cluster#systemctl disable nginx && systemctl stop nginx
	# yum -y install httpd

	# vim /etc/httpd/conf.d/tomcat.conf
	<proxy balancer://tomcat>
	BalancerMember http://172.16.251.232:8080
	BalancerMember http://172.16.251.74:8080
	ProxySet lbmethod=byrequests
	</proxy>
	<VirtualHost *:80>
	ServerName www.rj.com
	ProxyVia On
	ProxyRequests Off
	ProxyPreserveHost On
	<Proxy *>
	Require all granted
	</Proxy>
	ProxyPass / balancer://tomcat/
	ProxyPassReverse / balancer://tomcat/
	<Location />
	Require all granted
	</Location>
	</VirtualHost>

	cluster# vim /etc/httpd/conf.d/balancer-manager.conf
	<Location /balancer-manager>
	Sethandler balancer-manager
	ProxyPass !
	Require all granted
	</Location>

	# vim /etc/httpd/conf.d/tomcat.conf
	<proxy balancer://tomcat>
	BalancerMember ajp://172.16.251.232:8009
	BalancerMember ajp://172.16.251.74:8009
	ProxySet lbmethod=byrequests
	</proxy>
	<VirtualHost *:80>
	ServerName www.rj.com
	ProxyVia On
	ProxyRequests Off
	ProxyPreserveHost On
	<Proxy *>
	Require all granted
	</Proxy>
	ProxyPass / balancer://tomcat/
	ProxyPassReverse / balancer://tomcat/
	<Location />
	Require all granted
	</Location>
	</VirtualHost>

	<Host name="localhost" appBase="webapps"
	unpackWARs="true" autoDeploy="true">
	</Host>

	<Host name="tc1.magedu.com" appBase="/appdata/webapps" unpackWARs="true" autoDeploy="true">
	</Host>

	# mkdir -pv /appdata/webapps
	# mkdir -pv /appdata/webapps/ROOT/{lib,classes,WEB-INF}

	<Engine name="Catalina" defaultHost="localhost" jvmRoute="TomcatA">
	<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"
	channelSendOptions="8">
	<Manager className="org.apache.catalina.ha.session.DeltaManager"
	expireSessionsOnShutdown="false"
	notifyListenersOnReplication="true"/>
	<Channel className="org.apache.catalina.tribes.group.GroupChannel">
	<Membership className="org.apache.catalina.tribes.membership.McastService"
	address="228.0.32.4"
	port="45564"
	frequency="500"
	dropTime="3000"/>
	<Receiver className="org.apache.catalina.tribes.transport.nio.NioReceiver"
	address="192.168.254.130"
	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>

	# scp /etc/tomcat/server.xml 172.16.251.74:/etc/tomcat/server.xml
	# cp /etc/tomcat/web.xml /var/lib/tomcat/webapps/test/WEB-INF/

	# vim /var/lib/tomcat/webapps/test/WEB-INF/web.xml
	在 <!-- listings is enabled? [true] -->的后面加入
	<distributable/>
	# scp /var/lib/tomcat/webapps/test/WEB-INF/web.xml 172.16.251.74:/var/lib/tomcat/webapps/test/WEB-INF/
	node2# vim /etc/tomcat/server.xml
	更改 <Engine name="Catalina" defaultHost="localhost" jvmRoute="TomcatB">
	address="172.16.251.74"
	node1,2 #systemctl restart tomcat

	# cd /usr/share/tomcat/lib/
	# wget ftp://172.16.0.1/pub/Sources/7.x86_64/msm/* && rm -rf memcached-session-manager-tc8-1.8.3.jar
	# yum -y install memcached libmemcached
	# systemctl start memcached
	# sustemctl enable memcached
	node1(tomcat1,memcached1)

	# memcached 1配置
	# vim /etc/tomcat/server.xml
	# 修改
	<Engine name="Catalina" defaultHost="localhost" jvmRoute="rjTomcat1">
	在Host段中添加
	<Context path="/test" docBase="test" reloadable="true">
	<Manager className="de.javakaffee.web.msm.MemcachedBackupSessionManager"
	memcachedNodes="n1:172.16.251.232:11211,n2:172.16.251.74:11211"
	failoverNodes="n1"
	requestUriIgnorePattern=".*\.(ico\|png\|gif\|jpg\|css\|js)$"
	transcoderFactoryClass="de.javakaffee.web.msm.serializer.javolution.JavolutionTranscoderFactory"
	/>
	</Context>
	node2(tomcat,memcached2)
	# memcached 2配置
	<Engine name="Catalina" defaultHost="localhost" jvmRoute="rjTomcat2">
	# 在Host段中添加
	<Context path="/test" docBase="test" reloadable="true">
	<Manager className="de.javakaffee.web.msm.MemcachedBackupSessionManager"
	memcachedNodes="n1:172.16.251.232:11211,n2:172.16.251.74:11211"
	failoverNodes="n1"
	requestUriIgnorePattern=".*\.(ico\|png\|gif\|jpg\|css\|js)$"
	transcoderFactoryClass="de.javakaffee.web.msm.serializer.javolution.JavolutionTranscoderFactory"
	/>
	</Context>

	#vim /etc/sysyconfig/tomcat
	JAVA_OPTS="-server -Xms -Xmx -XX:NewSize= -XX:MaxNewSize= -XX:PermSize= -XX:MaxPermSize="

	<Connector port="8080" protocol="HTTP/1.1" connection Timeout="20000" redirectPort="8443" />
	Server="SOME STRING"