Tomcat经过Redis实现session共享的完整部署记录 Tomcat经过Redis实现session共享的完整部署记录

Tomcat经过Redis实现session共享的完整部署记录

 

 

对于生产环境有了必定规模的tomcat集群业务来讲,要实现session会话共享,比较稳妥的方式就是使用数据库持久化session.为何要持久化session（共享session）呢？由于在客户端每一个用户的Session对象存在Servlet容器中，若是Tomcat服务器重启或者宕机的话，那么该session就会丢失，而客户端的操做会因为session丢失而形成数据丢失；若是当前用户访问量巨大，每一个用户的Session里存放大量数据的话，那么就很占用服务器大量的内存，进而导致服务器性能受到影响。数据库持久化session，分为物理数据库和内存数据库。物理数据库备份session，因为其性能缘由，不推荐；内存数据库能够使用redis和memcached，以前已经介绍了memcached方式实现session共享了,下面说下redis方式:

可是有一点须要清楚:就是Redis这种方式目前还暂不支持Tomcat8环境(由于如今网上插件不支持tomcat8,非要支持tomcat8,则需修改插件jar包的源代码)!下面就先说下Tomcat7+Redis+Nginx实现session会话共享的操做记录:

实现达到的效果
当客户端访问Nginx服务器时，Nginx负载均衡会自动将请求转发到Tomcat1节点或Tomcat2节点服务器，以减轻Tomcat压力，从而达到Tomcat集群化部署，为了使各Tomcat之间共享同一个Session，将采用Redis缓存服务来集中管理Session存储。Nginx实现负载均衡，并使用Redis实现session共享。本案例采用的是redis单点方式(能够给这个redis节点配置一个从节点,采用redis主从模式,链接redis的master节点.redis默认不支持主主模式)，若是使用redis集群方式,则采用Sentinels链接。

1) 基础信息

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ip                 主机名           应用                       端口 192.168.10.200     Nginx-node       nginx1.12.2                80 192.168.10.201     Tomcat-node1     java8.13一、tomcat7.0.90    8080 192.168.10.202     Tomcat-node2     java8.13一、tomcat7.0.90    8080 192.168.10.203     redis-node       redis4.0.1                6379   下面操做在三台机器上一样执行： [root@Nginx-node ~] # cat /etc/redhat-release CentOS release 6.9 (Final)       为了方便测试，关闭iptables防火墙和selinux。若是是生产环境，开启iptables后，须要开放对应的应用端口。 [root@Nginx-node ~] # setenforce 0 [root@Nginx-node ~] # getenforce disabled [root@Nginx-node ~] # cat /etc/sysconfig/selinux |grep "SELINUX=disabled" SELINUX=disabled [root@Nginx-node ~] # /etc/init.d/iptables stop   本案例环境部署中所需的软件下载地址：https: //pan .baidu.com /s/1f9GM4iVAzfJsjskpAwv8Og 提取密码:dsfs 下载到服务器上的 /usr/local/src 目录下.另外:节点服务器的系统时间必定要保持一致!!

2) 安装Nginx（在192.168.10.200机器上操做）

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[root@Nginx-node ~] # cd /usr/local/src/ [root@Nginx-node src] # ll total 8920 -rw-rw-r--. 1 root root  981687 Oct 27  2017 nginx-1.12.2. tar .gz -rw-rw-r--. 1 root root 5453234 Aug 23  2018 openssl-1.1.0i. tar .gz -rw-rw-r--. 1 root root 2081413 Aug 23  2018 pcre-8.42. tar .gz -rw-rw-r--. 1 root root  607698 Jan 16  2017 zlib-1.2.11. tar .gz    安装依赖包 [root@Nginx-node src] # yum -y install gcc gcc-c++    安装pcre库 [root@Nginx-node src] # tar -zvxf pcre-8.42.tar.gz [root@Nginx-node src] # cd pcre-8.42 [root@Nginx-node pcre-8.42] # ./configure && make && make install    安装zlib库 [root@Nginx-node pcre-8.42] # cd /usr/local/src/ [root@Nginx-node src] # tar -zvxf zlib-1.2.11.tar.gz [root@Nginx-node src] # cd zlib-1.2.11 [root@Nginx-node zlib-1.2.11] # ./configure && make && make install    安装openssl [root@Nginx-node zlib-1.2.11] # cd /usr/local/src/ [root@Nginx-node src] # tar -zvxf openssl-1.1.0i.tar.gz [root@Nginx-node src] # cd openssl-1.1.0i [root@Nginx-node openssl-1.1.0i] # ./config && make && make install    安装nginx，特别注意要指定prce zlib openssl原码包位置 [root@Nginx-node openssl-1.1.0i] # cd /usr/local/src/ [root@Nginx-node src] # tar -zvxf nginx-1.12.2.tar.gz [root@Nginx-node src] # cd nginx-1.12.2                [root@Nginx-node nginx-1.12.2] # ./configure --prefix=/usr/local/nginx --with-http_ssl_module --with-pcre=/usr/local/src/pcre-8.42 --with-zlib=/usr/local/src/zlib-1.2.11  --with-openssl=/usr/local/src/openssl-1.1.0i [root@Nginx-node nginx-1.12.2] # make && make install    安装成功后配置nginx [root@Nginx-node nginx-1.12.2] # cd /usr/local/nginx/conf/ [root@Nginx-node conf] # cp nginx.conf nginx.conf.bak [root@Nginx-node conf] # cat nginx.conf #user  nobody; worker_processes  8;     #error_log  logs/error.log; #error_log  logs/error.log  notice; #error_log  logs/error.log  info;     #pid        logs/nginx.pid;     worker_rlimit_nofile 65535; events {     use epoll;      worker_connections  65535; }     http {      include       mime.types;      default_type  application /octet-stream ;      charset utf-8;                  ######      ## set access log format      ######      log_format  main  '$http_x_forwarded_for $remote_addr $remote_user [$time_local] "$request" '                        '$status $body_bytes_sent "$http_referer" '                        '"$http_user_agent" "$http_cookie" $host $request_time' ;          #######      ## http setting      #######      sendfile       on;      tcp_nopush     on;      tcp_nodelay    on;      keepalive_timeout  65;      fastcgi_connect_timeout 30000;      fastcgi_send_timeout 30000;      fastcgi_read_timeout 30000;      fastcgi_buffer_size 256k;      fastcgi_buffers 8 256k;      fastcgi_busy_buffers_size 256k;      fastcgi_temp_file_write_size 256k;      fastcgi_intercept_errors on;          ##cache##      client_header_timeout 60s;      client_body_timeout 60s;      client_max_body_size 10m;      client_body_buffer_size 1m;      proxy_connect_timeout 5;      proxy_read_timeout 60;      proxy_send_timeout 5;                  proxy_buffer_size 64k;      proxy_buffers 4 128k;      proxy_busy_buffers_size 128k;      proxy_temp_file_write_size 1m;      proxy_temp_path /home/temp_dir ;      proxy_cache_path /home/cache levels=1:2 keys_zone=cache_one:200m inactive=1d max_size=30g;      ##end##          gzip  on;      gzip_min_length  1k;      gzip_buffers     4 16k;      gzip_http_version 1.1;      gzip_comp_level 9;      gzip_types       text /plain application /x-javascript text /css application /xml text /javascript application /x-httpd-php ;      gzip_vary on;          ## includes vhosts      include vhosts/*.conf; }    [root@Nginx-node conf] # mkdir vhosts [root@Nginx-node conf] # cd vhosts/ [root@Nginx-node vhosts] # vim lb_tomcat.conf    upstream tomcat-lb {        server 192.168.10.201:8080;        server 192.168.10.202:8080;        }                              server {        listen  80;        server_name www.kevin.com;        location / {            proxy_pass http: //tomcat-lb ;            proxy_set_header  X-Real-IP $remote_addr;            proxy_set_header  REMOTE-HOST $remote_addr;            proxy_set_header  Host $host;            proxy_set_header  X-Forwarded-For $proxy_add_x_forwarded_for;          }          location ~ .*\.(gif|jpg|png|htm|html|css|ico|flv|swf)(.*) {                proxy_pass http: //tomcat-lb ;                proxy_redirect off;                proxy_set_header Host $host;                proxy_cache cache_one;                proxy_cache_valid 200 302 1h;                proxy_cache_valid 301 1d;                proxy_cache_valid any 10m;                expires 30d;                proxy_cache_key $host$uri$is_args$args;          } }    [root@Nginx-node vhosts] # /usr/local/nginx/sbin/nginx -t nginx: the configuration file /usr/local/nginx/conf/nginx .conf syntax is ok nginx: configuration file /usr/local/nginx/conf/nginx .conf test is successful [root@Nginx-node conf] # /usr/local/nginx/sbin/nginx [root@Nginx-node conf] # lsof -i:80 COMMAND   PID   USER   FD   TYPE   DEVICE SIZE /OFF NODE NAME nginx   25292   root    6u  IPv4 19679665      0t0  TCP *:http (LISTEN) nginx   25293 nobody    6u  IPv4 19679665      0t0  TCP *:http (LISTEN) nginx   25294 nobody    6u  IPv4 19679665      0t0  TCP *:http (LISTEN) nginx   25295 nobody    6u  IPv4 19679665      0t0  TCP *:http (LISTEN) nginx   25296 nobody    6u  IPv4 19679665      0t0  TCP *:http (LISTEN) nginx   25297 nobody    6u  IPv4 19679665      0t0  TCP *:http (LISTEN) nginx   25298 nobody    6u  IPv4 19679665      0t0  TCP *:http (LISTEN) nginx   25299 nobody    6u  IPv4 19679665      0t0  TCP *:http (LISTEN) nginx   25300 nobody    6u  IPv4 19679665      0t0  TCP *:http (LISTEN)    将域名www.kevin.com解析到192.168.10.200上，访问http: //www .kevin.com，发现访问请求结果会负载到192.168.10.201和192.168.10.202的tomcat上了。

3）安装tomcat（在192.168.10.201和192.168.10.202两台机器上操做）

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安装java8环境。先卸载掉系统自带的java7，而后安装java8 [root@Tomcat-node1 ~] # java -version java version "1.7.0_131" OpenJDK Runtime Environment (rhel-2.6.9.0.el6_8-x86_64 u131-b00) OpenJDK 64-Bit Server VM (build 24.131-b00, mixed mode) [root@Tomcat-node1 ~] # yum -y remove java-1.7.0-openjdk* [root@Tomcat-node1 ~] # yum -y remove tzdata-java.noarch [root@Tomcat-node1 ~] # java -version                 - bash : /usr/bin/java : No such file or directory      [root@Tomcat-node1 ~] # ll /usr/local/src/jdk-8u131-linux-x64_.rpm -rw-rw-r--. 1 root root 169983496 Nov 19  2017 /usr/local/src/jdk-8u131-linux-x64_ .rpm [root@Tomcat-node1 ~] # rpm -ivh /usr/local/src/jdk-8u131-linux-x64_.rpm --force [root@Tomcat-node1 ~] # vim /etc/profile ...... JAVA_HOME= /usr/java/jdk1 .8.0_131 JAVA_BIN= /usr/java/jdk1 .8.0_131 /bin PATH= /usr/local/sbin : /usr/local/bin : /usr/sbin : /usr/bin : /root/bin : /bin : /sbin/ CLASSPATH=.: /lib/dt .jar: /lib/tools .jar export JAVA_HOME JAVA_BIN PATH CLASSPATH      [root@Tomcat-node1 ~] # source /etc/profile [root@Tomcat-node1 ~] # java -version java version "1.8.0_131" Java(TM) SE Runtime Environment (build 1.8.0_131-b11) Java HotSpot(TM) 64-Bit Server VM (build 25.131-b11, mixed mode) You have new mail in /var/spool/mail/root      安装配置tomcat7 [root@Tomcat-node1 ~] # cd /usr/local/src/ [root@Tomcat-node1 src] # ll apache-tomcat-7.0.90.tar.gz -rw-rw-r--. 1 root root 9472492 Nov  9  2017 apache-tomcat-7.0.90. tar .gz [root@Tomcat-node1 src] # tar -zvxf apache-tomcat-7.0.90.tar.gz [root@Tomcat-node1 src] # mv apache-tomcat-7.0.90 /usr/local/tomcat7      配置tomcat7 [root@Tomcat-node1 ~] # cd /usr/local/tomcat7/conf/ [root@Tomcat-node1 conf] # cp server.xml server.xml.bak [root@Tomcat-node1 conf] # vim server.xml .......   <Engine name= "Catalina" defaultHost= "localhost" >                #这一行不须要修改,不必动 .......   <Host name= "localhost" appBase= "/data/webapps/" unpackWARS= "true" autoDeploy= "true" >          <Context path= "" docBase= "/data/webapps" reloadable= "true" /> ......          <Valve className= "org.apache.catalina.valves.AccessLogValve" directory= "/data/logs"                 prefix= "web1_access_log." suffix= ".txt"                 pattern= "%h %l %u %t " %r " %s %b" />    < /Host >     建立项目目录 [root@Tomcat-node1 conf] # mkdir -p /data/webapps/{WEB-INF,META-INF,classes,lib} [root@Tomcat-node1 conf] # mkdir /data/logs   建立测试文件 [root@Tomcat-node1 ~] # touch /data/webapps/index.jsp [root@Tomcat-node1 ~] # vim /data/webapps/index.jsp         <html>      <body bgcolor= "green" >          <center>         <%=  request.getSession().getId()  %>         <h1>192.168.10.201< /h1 >      <h1>port:8080< /h1 >      <h1>this is Tomcat-node1! < /h1 >      < /center >      < /body > < /html >    <%@ page contentType= "text/html;charset=UTF-8" isELIgnored= "false" %> SessionID:<%=session.getId()%><BR> SessionIP:<%=request.getServerName()%> <BR> SessionPort:<%=request.getServerPort()%> <%     out.println( "This is Tomcat server 201 !" );     %> You have new mail in /var/spool/mail/root     另外一个节点的测试文件为: [root@Tomcat-node2 ~] # vim /data/webapps/index.jsp <html>      <body bgcolor= "yellow" >          <center>         <%=  request.getSession().getId()  %>         <h1>192.168.10.202< /h1 >      <h1>port:8080< /h1 >      <h1>this is Tomcat-node2! < /h1 >      < /center >      < /body > < /html >    <%@ page contentType= "text/html;charset=UTF-8" isELIgnored= "false" %> SessionID:<%=session.getId()%><BR> SessionIP:<%=request.getServerName()%> <BR> SessionPort:<%=request.getServerPort()%> <%     out.println( "This is Tomcat server 202 !" );     %>     接着配置Redis+Session共享 [root@Tomcat-node1 ~] # cd /usr/local/tomcat7/conf/ [root@Tomcat-node1 conf] # cp context.xml context.xml.bak [root@Tomcat-node1 conf] # cat context.xml ......      <Valve className= "com.orangefunction.tomcat.redissessions.RedisSessionHandlerValve" />       <Manager className= "com.orangefunction.tomcat.redissessions.RedisSessionManager"                host= "192.168.10.203"                port= "6379"                database= "0"               maxInactiveInterval= "60" />     =============================================================== 舒适提示: 若是远程redis设置了密码,则就多加一行配置:password= "123456" ===============================================================     最后将依赖的三个jar包拷贝到tomcat7的lib目录下 [root@Tomcat-node1 jar] # pwd /usr/local/src/tomcat_redis_session/jar [root@Tomcat-node1 jar] # ll total 676 -rw-rw-r--. 1 root root 111969 Jul 29  2015 commons-pool2-2.4.2.jar -rw-rw-r--. 1 root root 553762 Oct 16  2017 jedis-2.9.0.jar -rw-rw-r--. 1 root root  20241 Aug 27 16:45 tomcat-redis-session-manager1.2.jar [root@Tomcat-node1 jar] # \cp -rf ./* /usr/local/tomcat7/lib/     启动tomcat [root@Tomcat-node1 src] # /usr/local/tomcat8/bin/startup.sh Using CATALINA_BASE:   /usr/local/tomcat8 Using CATALINA_HOME:   /usr/local/tomcat8 Using CATALINA_TMPDIR: /usr/local/tomcat8/temp Using JRE_HOME:        /usr/java/jdk1 .8.0_131 Using CLASSPATH:       /usr/local/tomcat8/bin/bootstrap .jar: /usr/local/tomcat8/bin/tomcat-juli .jar Tomcat started. You have new mail in /var/spool/mail/root [root@Tomcat-node1 src] # ps -ef|grep tomcat root      8477     1 87 03:11 pts /0    00:00:03 /usr/java/jdk1 .8.0_131 /bin/java -Djava.util.logging.config. file = /usr/local/tomcat8/conf/logging .properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djdk.tls.ephemeralDHKeySize=2048 -Djava.protocol.handler.pkgs=org.apache.catalina.webresources -classpath /usr/local/tomcat8/bin/bootstrap .jar: /usr/local/tomcat8/bin/tomcat-juli .jar -Dcatalina.base= /usr/local/tomcat8 -Dcatalina.home= /usr/local/tomcat8 -Djava.io.tmpdir= /usr/local/tomcat8/temp org.apache.catalina.startup.Bootstrap start root      8528  6829  0 03:11 pts /0    00:00:00 grep tomcat [root@Tomcat-node1 src] # lsof -i:8080 COMMAND  PID USER   FD   TYPE   DEVICE SIZE /OFF NODE NAME java    8477 root   49u  IPv6 12974768      0t0  TCP *:webcache (LISTEN)

4) redis安装

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[root@redis-node ~] # cd /usr/local/src/ [root@redis-node src] # ll redis-4.0.1.tar.gz -rw-rw-r-- 1 root root 1711660 Aug 27 16:19 redis-4.0.1. tar .gz   编写redis一键安装脚本 [root@redis-node src] # cat redis_install.sh #!/usr/bin/env bash # It's Used to be install redis. # Created on 2018/08/27 11:18. # @author: wangshibo. # Version: 1.0      function install_redis () { #################################################################################################          cd /usr/local/src          tar -zxvf /usr/local/src/redis-4 .0.1. tar .gz          cd redis-4.0.1          make PREFIX= /usr/local/redis install          mkdir -p /usr/local/redis/ {etc,var}          rsync -avz redis.conf  /usr/local/redis/etc/          sed -i 's@pidfile.*@pidfile /var/run/redis-server.pid@' /usr/local/redis/etc/redis .conf          sed -i "s@logfile.*@logfile /usr/local/redis/var/redis.log@" /usr/local/redis/etc/redis .conf          sed -i "s@^dir.*@dir /usr/local/redis/var@" /usr/local/redis/etc/redis .conf          sed -i 's/daemonize no/daemonize yes/g' /usr/local/redis/etc/redis .conf          sed -i 's/^# bind 127.0.0.1/bind 0.0.0.0/g' /usr/local/redis/etc/redis .conf   ################################################################################################# }      install_redis     赋予脚本执行权限,并进行安装 [root@redis-node src] # chmod 755 /usr/local/src/redis_install.sh [root@redis-node src] # /bin/bash -x /usr/local/src/redis_install.sh     编写redis-server启动脚本 [root@redis-node src] # cat /etc/init.d/redis-server #!/bin/bash # # redis - this script starts and stops the redis-server daemon # # chkconfig:   - 85 15 # description:  Redis is a persistent key-value database # processname: redis-server # config:      /usr/local/redis/etc/redis.conf # config:      /etc/sysconfig/redis # pidfile:     /usr/local/redis/var/redis-server.pid     # Source function library. . /etc/rc .d /init .d /functions     # Source networking configuration. . /etc/sysconfig/network     # Check that networking is up. [ "$NETWORKING" = "no" ] && exit 0     redis= "/usr/local/redis/bin/redis-server" prog=$( basename $redis)     REDIS_CONF_FILE= "/usr/local/redis/etc/redis.conf"     [ -f /etc/sysconfig/redis ] && . /etc/sysconfig/redis     lockfile= /var/lock/subsys/redis-server     start() {      [ -x $redis ] || exit 5      [ -f $REDIS_CONF_FILE ] || exit 6      echo -n $ "Starting $prog: "      daemon $redis $REDIS_CONF_FILE      retval=$?      echo      [ $retval - eq 0 ] && touch $lockfile      return $retval }     stop() {      echo -n $ "Stopping $prog: "      killproc $prog      retval=$?      echo      [ $retval - eq 0 ] && rm -f $lockfile      return $retval }     restart() {      stop      start }     reload() {      echo -n $ "Reloading $prog: "      killproc $redis -HUP      RETVAL=$?      echo }     force_reload() {      restart }     rh_status() {      status $prog }     rh_status_q() {      rh_status > /dev/null 2>&1 }     case "$1" in      start)          rh_status_q && exit 0          $1          ;;      stop)          rh_status_q || exit 0          $1          ;;      restart)          $1          ;;      reload)          rh_status_q || exit 7          $1          ;;      force-reload)          force_reload          ;;      status)          rh_status          ;;      condrestart|try-restart)          rh_status_q || exit 0              ;;      *)          echo $ "Usage: $0 {start|stop|status|restart|condrestart|try-restart|reload|force-reload}"          exit 2 esac     赋予脚本执行权限,并启动redis-server [root@redis-node src] # /etc/init.d/redis-server start [root@redis-node src] # lsof -i:6379 COMMAND     PID USER   FD   TYPE   DEVICE SIZE /OFF NODE NAME redis-ser 24439 root    6u  IPv4 24642923      0t0  TCP dns02.kevin.cn:6379 (LISTEN)   舒适提示: 须要将redis.conf文件中的bind改成本机ip.不能使用默认的127.0.0.1,不然远程链接该redis就会失败 [root@redis-node src] # vim /usr/local/redis/etc/redis.conf ..... bind 192.168.10.203   重启redis-server服务 [root@redis-node src] # /etc/init.d/redis-server restart Stopping redis-server:                                     [  OK  ] Starting redis-server:                                     [  OK  ] [root@redis-node src] # lsof -i:6379 COMMAND    PID USER   FD   TYPE   DEVICE SIZE /OFF NODE NAME redis-ser 8184 root    6u  IPv4 24688720      0t0  TCP dns02.kevin.cn:6379 (LISTEN)   最好在tomcat两个节点上使用 "telnet 192.168.10.203 6379" 验证下redis是否能成功链接

5) tomcat经过redis共享session测试
访问http://www.kevin.com,不断刷新页面,发现页面的其余信息改变,可是sessionid保持不变,即说明实现了session共享!

关闭两个节点中的任意一个tomcat服务,继续访问页面,发现sessionid任然保持不变!

而后在redis机器上查看有没有上面sessionid的key值存在

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[root@redis-node ~] # /usr/local/redis/bin/redis-cli -h 192.168.10.203 -p 6379 192.168.10.203:6379> keys * 1) "F7FE0AE8BD1654584A330A804A7BE5FE" 192.168.10.203:6379>

<Valve className="com.orangefunction.tomcat.redissessions.RedisSessionHandlerValve" />

     <Manager className= "com.orangefunction.tomcat.redissessions.RedisSessionManager"

              sentinels= "192.168.9.223:30001,192.168.9.223:30002" />          #这里是redis哨兵的地址,多个sentinels集群就写多个ip地址

              maxInactiveInterval= "60"

              sentinelMaster= "mymaster"                                       #这里是sentinel的master名称，必定不要写错

              password= "123456"                                               #还有认证密码

Tomcat+Redis Sentinel工做原理:
原此时咱们链接的不在是redis主从,而是直接链接哨兵，哨兵会监测后端的redis主从，当主挂掉以后，会挑选一台从当主机，而后在自身的状态中更新，此时，就不用担忧主挂掉以后，IP飘移的问题了，哨兵能够多个，当某个哨兵挂掉也不会影响。

网络拓扑图以下:

"com.naritech.nicole.gump.RedisSessionHandlerValve" />

<Manager className= "com.naritech.nicole.gump.RedisSessionManager"

     host= "192.168.10.203"

     port= "6379"

     database= "0"

     maxInactiveInterval= "60"

  />

案例中配置以下：

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[root@Tomcat-node1 ~] # cat /usr/local/tomcat8/conf/context.xml <?xml version= "1.0" encoding= "UTF-8" ?> <!--    Licensed to the Apache Software Foundation (ASF) under one or more    contributor license agreements.  See the NOTICE file distributed with    this work for additional information regarding copyright ownership.    The ASF licenses this file to You under the Apache License, Version 2.0    (the "License" ); you may not use this file except in compliance with    the License.  You may obtain a copy of the License at          http: //www .apache.org /licenses/LICENSE-2 .0      Unless required by applicable law or agreed to in writing, software    distributed under the License is distributed on an "AS IS" BASIS,    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.    See the License for the specific language governing permissions and    limitations under the License. --> <!-- The contents of this file will be loaded for each web application --> <Context>        <!-- Default set of monitored resources. If one of these changes, the    -->      <!-- web application will be reloaded.                                   -->      <WatchedResource>WEB-INF /web .xml< /WatchedResource >      <WatchedResource>${catalina.base} /conf/web .xml< /WatchedResource >      <Valve className= "com.naritech.nicole.gump.RedisSessionHandlerValve" />      <Manager className= "com.naritech.nicole.gump.RedisSessionManager"          host= "192.168.10.203"          port= "6379"          database= "0"          maxInactiveInterval= "60"       />      <!-- Uncomment this to disable session persistence across Tomcat restarts -->      <!--      <Manager pathname= "" />      --> < /Context >

重启tomcat服务

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[root@Tomcat-node1 ~] # chmod 755 /usr/local/tomcat8/bin/* [root@Tomcat-node1 ~] # ps -ef|grep tomcat|awk '{print $2}'|xargs kill -9 [root@Tomcat-node1 ~] # /usr/local/tomcat8/bin/startup.sh                [root@Tomcat-node1 ~] # lsof -i:8080 COMMAND   PID USER   FD   TYPE DEVICE SIZE /OFF NODE NAME java    13439 root   50u  IPv6 685905      0t0  TCP *:webcache (LISTEN)

最后访问http://www.kevin.com页面，不断刷新，发现页面内容发生改变了，可是sessionid一直不变！说明实现了session共享！！！