Tomcat session remains to achieve session (b)

Tomcat on the back end of the sharing session through multicasting

Experimental architecture diagram:

Preparing the Environment

#清空防火墙规则
iptables -F
iptables -X

#临时设置关闭selinux
setenforce 0

#安装jdk，centos7的源默认最高支持jdk1.8
yum -y install java-1.8.0-openjdk-devel 

#更改主机名解析
vim /etc/hosts
192.168.8.161 tomcat2
192.168.8.160 tomcat1

Experimental deployment steps:

Nginx configuration

#安装并配置Nginx反向代理
[root@nginx ~]#yum -y instll nginx
#修改nginx配置文件
[root@nginx ~]#vim /etc/nginx/nginx.conf
user nginx;
worker_processes auto;
error_log /var/log/nginx/error.log;
pid /run/nginx.pid;

include /usr/share/nginx/modules/*.conf;

events {
    worker_connections 1024;
}

http {
    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  /var/log/nginx/access.log  main;

    sendfile            on;
    tcp_nopush          on;
    tcp_nodelay         on;
    keepalive_timeout   65;
    types_hash_max_size 2048;

    include             /etc/nginx/mime.types;
    default_type        application/octet-stream;

    include /etc/nginx/conf.d/*.conf;
}
upstream web {
        server 192.168.8.160:8080;
        server 192.168.8.161:8080;
}
server {
        listen 80 default_server;
        index index.jsp;
        location / {
                proxy_pass http://web/;
        }
}
#检查语法
[root@nginx ~]#nginx -t

#检查无误后启动nginx
[root@nginx ~]#systemctl start nginx

Configuration tomcat1

#安装tomcat以及对应的其他管理工具
[root@tomcat1 ~]#yum -y install tomcat tomcat-lib tomcat-admin-webapps tomcat-webapps tomcat-docs-webapp
#创建必要的文件夹
[root@tomcat1 ~]#mkdir -pv /data/app/ROOT/{WEB-INF,META-INF,classes,lib}
[root@tomcat1 ~]#vim /data/app/ROOT/index.jsp
<%@ page language="java" %>
        <html>
                <head><title>TomcatA</title></head>
                <body>
                        <h1><font color="red">TomcatA</font></h1>
            table align="centre" border="1">
                                <tr>
                                        <td>Session ID</td>
                                <% session.setAttribute("www.zd.com","www.zd.com"); %>
                                        <td><%= session.getId() %></td>
                                </tr>
                                <tr>
                    <td>Created on</td>
                    <td><%= session.getCreationTime() %></td>
                </tr>
            </table>
                </body>
        </html>
#编辑tomcat配置文件
[root@tomcat1 ~]#vim /etc/tomcat/server.xml 
<Host name="localhost"  appBase="/data/app"
            unpackWARs="true" autoDeploy="true">
        <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"
                        #广播地址
                        address="228.0.100.4"
                        port="45564"
                        frequency="500"
                        dropTime="3000"/>
            <Receiver className="org.apache.catalina.tribes.transport.nio.NioReceiver"
                    #本机能够监听的IP地址
                      address="192.168.8.160" 
                      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>
        <!-- SingleSignOn valve, share authentication between web applications
             Documentation at: /docs/config/valve.html -->
        <!--
        <Valve className="org.apache.catalina.authenticator.SingleSignOn" />
        -->

        <!-- Access log processes all example.
             Documentation at: /docs/config/valve.html
             Note: The pattern used is equivalent to using pattern="common" -->
        <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"
               prefix="localhost_access_log." suffix=".txt"
               pattern="%h %l %u %t "%r" %s %b" />
      </Host>
#修改tomcat-users.xml配置文件
[root@tomcat1 ~]#vim /etc/tomcat/tomcat-users.xml
<role rolename="admin-gui"/>
<role rolename="admin-script"/>
<role rolename="manager-gui"/>
<role rolename="manager-script"/>
<user username="tomcat" password="www.test.com" roles="manager-gui,manager-script,admin-gui,admin-script"/>
#拷贝web.xml文件
[root@tomcat1 ~]#cp /etc/tomcat/web.xml /data/app/ROOT/WEB-INF/web.xml 
<distributable/>
#启动tomcat服务
[root@tomcat1 ~]#systemctl restart tomcat

Configuration tomcat2

#创建必要的目录
[root@tomcat2 ~]#mkdir /data
#从tomcat1上拷贝相关文件
[root@tomcat1 ~]#scp -r /data/app/ 192.168.8.161:/data/ 
[root@tomcat1 ~]#scp /etc/tomcat/server.xml 192.168.8.161:/etc/tomcat/server.xml 
[root@tomcat1 ~]#scp /etc/tomcat/tomcat-users.xml 192.168.8.161:/etc/tomcat/tomcat-users.xml 
#编辑网页文件
[root@tomcat2 ~]#vim /data/app/ROOT/index.jsp
<%@ page language="java" %>
        <html>
                <head><title>TomcatB</title></head>
                <body>
                        <h1><font color="blue">TomcatB</font></h1>
            table align="centre" border="1">
                                <tr>
                                        <td>Session ID</td>
                                <% session.setAttribute("www.test.com","www.test.com"); %>
                                        <td><%= session.getId() %></td>
                                </tr>
                                <tr>
                    <td>Created on</td>
                    <td><%= session.getCreationTime() %></td>
                </tr>
            </table>
                </body>
        </html>
#更改tomcat配置文件
[root@tomcat2 ~]#vim /etc/tomcat/server.xml 
<Host name="localhost"  appBase="/data/app"
            unpackWARs="true" autoDeploy="true">
        <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"
                        #广播地址
                        address="228.0.100.4"
                        port="45564"
                        frequency="500"
                        dropTime="3000"/>
            <Receiver className="org.apache.catalina.tribes.transport.nio.NioReceiver"
                      #本机能够监听的IP地址
                      address="192.168.8.161" 
                      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>
        <!-- SingleSignOn valve, share authentication between web applications
             Documentation at: /docs/config/valve.html -->
        <!--
        <Valve className="org.apache.catalina.authenticator.SingleSignOn" />
        -->

        <!-- Access log processes all example.
             Documentation at: /docs/config/valve.html
             Note: The pattern used is equivalent to using pattern="common" -->
        <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"
               prefix="localhost_access_log." suffix=".txt"
               pattern="%h %l %u %t "%r" %s %b" />
      </Host>
#启动tomcat服务
[root@tomcat2 ~]#systemctl restart tomcat