Nginx+Tomcat配置集群session共享

纯属转载同事YHM的博客，只为自己好找一点

tomcat自带session共享功能 不必非集成第三方软件 只需配置即可 http://tomcat.apache.org/tomcat-8.5-doc/cluster-howto.html

为什么选择Nginx？

Nginx 是一个很强大的高性能Web和反向代理服务器，它具有很多非常优越的特性：
在连接高并发的情况下，Nginx是Apache服务器不错的替代品：Nginx在美国是做虚拟主机生意的老板们经常选择的软件平台之一。能够支持高达 50,000 个并发连接数的响应，感谢Nginx为我们选择了 epoll and kqueue作为开发模型。

配置结构图

1、下载地址

http://nginx.org/en/download.html ，这里我们推荐下载稳定版（stable versions），本文采用nginx/Windows-1.12.0。

2、目录结构

Nginx-
| conf 配置目录
| contrib
| docs 文档目录
| logs 日志目录
| temp 临时文件目录
| html 静态页面目录
|_ nginx.exe 主程序
window下安装Nginx极其简单，解压缩到一个无空格的英文目录即可（个人习惯，担心中文出问题），双击nginx启动，这里我安装到：D: ginx目录，下面涉及到的tomcat也安装在此目录。

Nginx  命令

start nginx
nginx -s stop
nginx -s quit

3、nginx.conf配置

Nginx配置文件默认在conf目录，主要配置文件为nginx.conf

#user  nobody;
worker_processes  1;

#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

#pid        logs/nginx.pid;


events {
    worker_connections  1024;
}


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;

    sendfile        on;
    #tcp_nopush     on;

    #keepalive_timeout  0;
    keepalive_timeout  65;

    #gzip  on;

    upstream suroot{
        server 127.0.0.1:8090 max_fails=2 fail_timeout=30s;
        server 127.0.0.1:9091 max_fails=2 fail_timeout=30s;
    }

    server {
        listen       80;
        server_name  localhost;

        #charset koi8-r;

        #access_log  logs/host.access.log  main;

        location / {
            root   html;
            index  index.html index.htm index.jsp login.jsp; #定义首页索引文件的名称
            proxy_pass http://suroot/;#请求转向suroot定义的服务器列表
            #以下是一些反向代理的配置可删除.
            proxy_redirect off;
            proxy_set_header   Host $host;
            proxy_set_header   X-Real-IP $remote_addr;
            proxy_set_header   X-Forwarded-For $proxy_add_x_forwarded_for;
            client_max_body_size   10m;#允许客户端请求的最大单文件字节数
            client_body_buffer_size   128k;#缓冲区代理缓冲用户端请求的最大字节数，
            proxy_connect_timeout   600;#nginx跟后端服务器连接超时时间(代理连接超时)
            proxy_send_timeout   600; #后端服务器数据回传时间(代理发送超时)
            proxy_read_timeout   600; #连接成功后，后端服务器响应时间(代理接收超时)
            proxy_buffer_size   8k; #设置代理服务器（nginx）保存用户头信息的缓冲区大小
            proxy_buffers   4 64k;#proxy_buffers缓冲区，网页平均在32k以下的话，这样设置
            proxy_busy_buffers_size   128k;#高负荷下缓冲大小（proxy_buffers*2）
            proxy_temp_file_write_size  128k;#设定缓存文件夹大小，大于这个值，将从upstream服务器传
        }

        #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;
        }

        # proxy the PHP scripts to Apache listening on 127.0.0.1:80
        #
        #location ~ .php$ {
        #    proxy_pass   http://127.0.0.1;
        #}

        # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
        #
        #location ~ .php$ {
        #    root           html;
        #    fastcgi_pass   127.0.0.1:9000;
        #    fastcgi_index  index.php;
        #    fastcgi_param  SCRIPT_FILENAME  /scripts$fastcgi_script_name;
        #    include        fastcgi_params;
        #}

        # deny access to .htaccess files, if Apache's document root
        # concurs with nginx's one
        #
        #location ~ /.ht {
        #    deny  all;
        #}
    }


    # another virtual host using mix of IP-, name-, and port-based configuration
    #
    #server {
    #    listen       8000;
    #    listen       somename:8080;
    #    server_name  somename  alias  another.alias;

    #    location / {
    #        root   html;
    #        index  index.html index.htm;
    #    }
    #}


    # HTTPS server
    #
    #server {
    #    listen       443 ssl;
    #    server_name  localhost;

    #    ssl_certificate      cert.pem;
    #    ssl_certificate_key  cert.key;

    #    ssl_session_cache    shared:SSL:1m;
    #    ssl_session_timeout  5m;

    #    ssl_ciphers  HIGH:!aNULL:!MD5;
    #    ssl_prefer_server_ciphers  on;

    #    location / {
    #        root   html;
    #        index  index.html index.htm;
    #    }
    #}

}

4、Tomcat配置

对于tomcat大家都很熟悉，只需要修改server.xml配置文件即可;

这里我们以apache-tomcat-8.5.5为例，分别在server目录，解压缩并命名为：apache-tomcat-8.5.5-8090、apache-tomcat-8.5.5-8091

第一处端口修改：
Xml代码 :

<!--  修改port端口：8006 俩个tomcat不能重复，端口随意，别太小-->
<Server port="8006" shutdown="SHUTDOWN">

第二处端口修改：
Xml代码 :

<!-- port="8090" tomcat监听端口，随意设置，别太小 -->
<Connector port="8090" protocol="HTTP/1.1"
               connectionTimeout="20000"
               redirectPort="8443" />

第三处端口修改：

<Connector port="8009" protocol="AJP/1.3" redirectPort="8443" />

第四处session共享配置

<!--
<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"/>
-->
  <Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"
           channelSendOptions="6">

    <Manager className="org.apache.catalina.ha.session.BackupManager"
             expireSessionsOnShutdown="false"
             notifyListenersOnReplication="true"
             mapSendOptions="6"/>
    <!--
    <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="228.0.0.4"
                  port="45564"
                  frequency="500"
                  dropTime="3000"/>
      <Receiver className="org.apache.catalina.tribes.transport.nio.NioReceiver"
                address="auto"
                port="5000"
                selectorTimeout="100"
                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.MessageDispatchInterceptor"/>
      <Interceptor className="org.apache.catalina.tribes.group.interceptors.ThroughputInterceptor"/>
    </Channel>

    <Valve className="org.apache.catalina.ha.tcp.ReplicationValve"
           filter=".*.gif|.*.js|.*.jpeg|.*.jpg|.*.png|.*.htm|.*.html|.*.css|.*.txt"/>

    <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.ClusterSessionListener"/>
  </Cluster>

官方文档地址：http://tomcat.apache.org/tomcat-8.5-doc/cluster-howto.html

其次验证tomcat，启动两个tomcat，不出现端口冲突即为成功。

java项目web.xml需要配置加入

<distributable/>

验证页面session是否相同

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
  String path = request.getContextPath();
  String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
  <base href="<%=basePath%>">

  <title>My JSP 'index.jsp' starting page</title>
  <meta http-equiv="pragma" content="no-cache">
  <meta http-equiv="cache-control" content="no-cache">
  <meta http-equiv="expires" content="0">
  <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
  <meta http-equiv="description" content="This is my page">
  <!--
  <link rel="stylesheet" type="text/css" href="styles.css">
  -->
</head>

<body>
  SessionID:<%=session.getId()%>
  <BR>
  SessionIP:<%=request.getServerName()%>
  <BR>
  SessionPort:<%=request.getServerPort()%>
  <%
    out.println("This is Tomcat Server 11111");
  %>
</body>
</html>

参考文章地址：http://www.jianshu.com/p/47a94a3bff34