tomcat msm部署

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本篇讲述tomcat msm，实现由memcached集中式管理会话模式。

实验环境

主机

端口

开源软件

192.168.161.73

8081

tomcat

192.168.161.73

8080

tomcat

192.168.161.73

11213

memcached

192.168.161.73

11214

memcached

192.168.161.73

8888

nginx

说明：

8080、8081 分别为tomcat两实例;

11212、11213 分别为 memcached两实例;

web应用示例工程casdemo部署在tomcat两实例上。

Nginx 8888端口，如果为非80端口，用ngnix分发tomcat中J2ee应用重定向会自动跳转到80端口，需要做特殊处理。

MSM介绍

传统tomcat集群，会话复制随着结点数增多，扩展性成为瓶颈。Msm使用memcached完成统一管理tomcat会话，避免tomcat结点间过多会话复制。MSM会话分为sticky与no-ticky模式。

sticky ：会话粘连模式。客户端在一台tomcat实例上完成登录后，以后的请求均会根据IP直接绑定到该tomcat实例。

no-sticky:会话非粘连模式。客户端的请求是随机分发，多台tomcat实例均会收到请求。

MSM依赖包

spymemcached-2.11.1.jar

reflectasm-1.01.jar

msm-kryo-serializer-1.8.3.jar

msm-javolution-serializer-1.8.3.jar

msm-flexjson-serializer-1.8.3.jar

minlog-1.2.jar

memcached-session-manager-tc8-1.8.3.jar --tc8为tomcat的版本号。不同版本号tomcat，对应的包不同。此处为tomcat8的jar包

memcached-session-manager-1.8.3.jar

kryo-serializers-0.11.jar

kryo-1.04.jar

asm-3.2.jar

放到tomcat/lib下

tomcat配置

1. 8080 端口tomcat 实例关键配置

修改tomcat目录下conf/server.xml。修改的内容下面用红色加粗标注。

<Server port="8005" shutdown="SHUTDOWN">             <Connector port="8080" protocol="HTTP/1.1"               connectionTimeout="20000"               redirectPort="8443" />        <Connector port="8009" protocol="AJP/1.3" redirectPort="8443" />       <Engine name="Catalina" defaultHost="localhost" jvmRoute="tomcat1">   ---非必选 ，只有选择了sticky模式才加入jvmRoute属性。不同的tomcat实例 jvmRoute取值不能相同。例：8080端口的tomcat实例jvmRoute=tomcat1,8081端口的tomcat实例jvmRoute=tomcat2

2. 8081 端口tomcat 实例关键配置

<Server port="9005" shutdown="SHUTDOWN">             <Connector port="8081" protocol="HTTP/1.1"               connectionTimeout="20000"               redirectPort="8443" />        <Connector port="9009" protocol="AJP/1.3" redirectPort="8443" />       <Engine name="Catalina" defaultHost="localhost" jvmRoute="tomcat2">   ---非必选 ，只有选择了sticky模式才加入jvmRoute属性。不同的tomcat实例 jvmRoute取值不能相同。例：8080端口的tomcat实例jvmRoute=tomcat1,8081端口的tomcat实例jvmRoute=tomcat2

3. msm配置

修改tomcat目录下conf/context.xml。修改的内容下面用红色加粗标注。

No-Stick模式

<Manager className="de.javakaffee.web.msm.MemcachedBackupSessionManager"memcachedNodes="n1:192.168.161.73:11213,n2:192.168.161.73:11214" lockingMode="auto" sticky="false" requestUriIgnorePattern=".*\.(png|gif|jpg|css|js|ico|jpeg|htm|html)$"  sessionBackupAsync="false" sessionBackupTimeout="1800000" copyCollectionsForSerialization="false" transcoderFactoryClass="de.javakaffee.web.msm.serializer.kryo.KryoTranscoderFactory" />

Stick模式

<Manager  className="de.javakaffee.web.msm.MemcachedBackupSessionManager"      memcachedNodes="n1:192.168.161.73:11213,n2:192.168.161.73:11214"  lockingMode="auto"sticky="true" failoverNodes="n1" requestUriIgnorePattern=".*\.(png|gif|jpg|css|js|ico|jpeg|htm|html)$"  transcoderFactoryClass="de.javakaffee.web.msm.serializer.kryo.KryoTranscoderFactory" />

运行memcached

1. 运行11213端口memcached实例

./memcached -d -m 128 -p 11213 -u root

2. 运行11214端口memcached实例

./memcached -d -m 128 -p 11214 -u root

运行ngnix

cd sbin

./ngnix

conf/nginx.conf供参考

#user  nobody;user root root;worker_processes  2;worker_rlimit_nofile 65535;#error_log  logs/error.log;error_log  logs/error.log  notice;#error_log  logs/error.log  info; #pid        logs/nginx.pid;  events {    use epoll;    worker_connections  65535;} http {    include       mime.types;    default_type  application/octet-stream;     log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '                      '$status $body_bytes_sent "$http_referer" '                      '"$http_user_agent" "$http_x_forwarded_for"';          access_log  logs/access.log  main;#控制缓冲区溢出攻击client_body_buffer_size  1K;client_header_buffer_size 1k;client_max_body_size 1k;large_client_header_buffers 2 1k;##cache##proxy_connect_timeout 5;proxy_read_timeout 60;proxy_send_timeout 5;proxy_buffer_size 16k;proxy_buffers 4 64k;gzip_proxied any;  proxy_busy_buffers_size 128k;proxy_temp_file_write_size 128k;proxy_temp_path /home/temp_dir;proxy_cache_path /home/cache levels=1:2 keys_zone=cache_one:200m inactive=1d max_size=1g;      #gzip#gzip    on;gzip_vary on;gzip_min_length   1k;gzip_buffers   4 8k;gzip_comp_level 4;gzip_http_version  1.0;    gzip_types   text/plain  text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript;gzip_disable "MSIE [1-6]\.";      sendfile        on;    #tcp_nopush     on;     #keepalive_timeout  0;    keepalive_timeout  65;     #gzip  on;    upstream tc{#ip_hash;         server 192.168.161.73:8080;       server 192.168.161.73:8081;    }    server {        listen       8888;        server_name  localhost;        charset utf-8;         #access_log  logs/host.access.log  main;         location /casdemo {proxy_pass http://tc/casdemo/;# $server_port 可以不要，只有nginx的端口是非80情况下有效proxy_set_header        Host $host:$server_port; #proxy_set_header        X-Real-IP $remote_addr;#proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;}location ~ .*\.(jsp|do|action)?${# $server_port 可以不要，只有nginx的端口是非80情况下有效proxy_set_header Host $host:$server_port;#proxy_set_header        X-Real-IP $remote_addr;#proxy_set_header X-Forwarded-For $remote_addr;proxy_pass http://tc;}# location ~ .*\.(js)?$# {# proxy_pass http://tc;        #                proxy_redirect off;        #                proxy_cache_key $host$uri$is_args$args;        #                proxy_set_header Host $host;         #               proxy_cache cache_one;          #              proxy_cache_valid 200 302 1h;           #             proxy_cache_valid 301 1d;            #            proxy_cache_valid any 1m;# expires   1h;# }          #error_page  404              /404.html;         # redirect server error pages to the static page /50x.html        #        error_page   500 502 503 504  /50x.html;        location = /50x.html {            root   html;        }         } }

casdemo应用

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"    pageEncoding="ISO-8859-1"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Insert title here</title></head><body>  <h1>TOMCAT实例1</h1>     <!--此处在不同8080与8081端口tomcat实例上分别为TOMCAT实例1 、TOMCAT实例2--><form action="login" method="post" ><input type="text" name="username"/><input type="submit" name="login" value="login" /></form></body></html> usr/index.jsp<%@ page language="java" contentType="text/html; charset=ISO-8859-1"    pageEncoding="ISO-8859-1"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Insert title here</title></head><body><h1>TOMCAT实例2</h1>     <!--此处在不同8080与8081端口tomcat实例上分别为TOMCAT实例1 、TOMCAT实例2-->Hello <%=request.getSession().getAttribute("user")%>!!!<a href="../login">exit</a></body></html>

web.xml

<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">  <display-name>casdemo</display-name>  <welcome-file-list>    <welcome-file>index.html</welcome-file>    <welcome-file>index.htm</welcome-file>    <welcome-file>index.jsp</welcome-file>    <welcome-file>default.html</welcome-file>    <welcome-file>default.htm</welcome-file>    <welcome-file>default.jsp</welcome-file>  </welcome-file-list>   <filter>    <filter-name>CheckLoginFilter</filter-name>    <filter-class>casdemo.CheckLoginFilter</filter-class>  </filter>  <listener>    <listener-class>casdemo.DebugSessionListener</listener-class>  </listener>  <servlet>     <servlet-name>login</servlet-name>     <servlet-class>casdemo.Login</servlet-class></servlet>   <servlet-mapping>     <servlet-name>login</servlet-name>     <url-pattern>/login</url-pattern></servlet-mapping>  <filter-mapping>    <filter-name>CheckLoginFilter</filter-name>    <url-pattern>/usr/*</url-pattern>  </filter-mapping></web-app>

CheckLoginFilter

package casdemo; import java.io.IOException;import javax.servlet.Filter;import javax.servlet.FilterChain;import javax.servlet.FilterConfig;import javax.servlet.ServletException;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpServletResponseWrapper;import javax.servlet.http.HttpSession;public class CheckLoginFilter implements Filter { @Overridepublic void destroy() {// TODO Auto-generated method stub} @Overridepublic void doFilter(ServletRequest request, ServletResponse response,FilterChain chain) throws IOException, ServletException {//System.out.println("=====");HttpServletRequest req=((HttpServletRequest) request);//System.out.println("getRequestURL  :"+req.getRequestURL());//System.out.println("getQueryString  :"+req.getQueryString());System.out.println((req.getSession(false)==null)+"isRequestedSessionIdFromCookie :"+req.isRequestedSessionIdFromCookie());System.out.println((req.getSession(false)==null)+"isRequestedSessionIdValid :"+req.isRequestedSessionIdValid());if(req.getSession(false)!=null&&!req.isRequestedSessionIdValid()){System.out.println("====session is not valid");}HttpSession session=req.getSession();session.setMaxInactiveInterval(1000*60*30);if(session.getAttribute("user")!=null&&!session.getAttribute("user").equals("")){System.out.println("alreay login");chain.doFilter(request, response);}else{System.out.println("not login");//HttpServletResponse resp=((HttpServletResponse) response);HttpServletResponseWrapper wrapper = new HttpServletResponseWrapper((HttpServletResponse) response);wrapper.sendRedirect("/casdemo/login.jsp");}} @Overridepublic void init(FilterConfig arg0) throws ServletException {// TODO Auto-generated method stub} }

package casdemo; import java.io.IOException; import javax.servlet.ServletConfig;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;  /** * Servlet implementation class Login */public class Login extends HttpServlet {private static final long serialVersionUID = 1L;         /**     * @see HttpServlet#HttpServlet()     */    public Login() {            super();        // TODO Auto-generated constructor stub    }    private ApplicationContext applicationContext; /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {HttpSession session=request.getSession();session.invalidate();response.sendRedirect("login.jsp");}public void init(ServletConfig config) throws ServletException {        // TODO Auto-generatedmethod stub     super.init(config);   } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {HttpSession session=request.getSession();String username=request.getParameter("username");session.setAttribute("user",username);response.sendRedirect("usr/index.jsp");} }

DebugSessionListener

package casdemo;import javax.servlet.http.HttpSession;import javax.servlet.http.HttpSessionEvent;import javax.servlet.http.HttpSessionListener;public class DebugSessionListener  implements HttpSessionListener {public void sessionCreated(HttpSessionEvent event) {HttpSession session = event.getSession();String sessionId = session.getId();System.out.println(">>>>>>>>>>>create session id " + sessionId);}public void sessionDestroyed(HttpSessionEvent event) {HttpSession session = event.getSession();String sessionId = session.getId();System.out.println(">>>>>>>>>>>destory session id" + sessionId);}}

源码地址

部署测试

访问http://localhost:8888/casdemo

1. 测试负载分发：

测试网页是来自于tomcat1或者tomcat2的页面请求，如果是来自于tomcat1，登录页面（login.jsp）显示“TOMCAT1”，登录成功后跳转页面（index.jsp），显示“TOMCAT1”。

2. 测试tomcat单点故障

登录成功后跳转页面（index.jsp），根据网页上显示的tomcat实例号，手工关闭该tomcat实例。

刷新跳转页面（index.jsp），查看页面是否还能维持会话。如果跳转到登录页，说明会话丢失。如果不跳转，显示新tomcat实例，说明会话已经在新的tomcat实例完成共享。

3. 测试memcached单点故障

关闭某台memcached，测试会话是否正常。如果两台memcached没有保持同步,关闭会话没有缺失的memcached，会造成会话丢失,因为余下的memcached会话数据不完整。

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