nginx+tomcat9+redisson+redis+jdk1.8简单实现session共享

一、环境安装

由于资源限制，在虚拟机中模拟测试，一台虚拟机，所有软件均安装到该虚拟机内

安装系统：CentOS Linux release 7.4.1708 (Core)

CentOS安装选择版本：Basic Web Server

redis版本：5.0.2

jdk版本：1.8.0_191

nginx版本：1.14.1

tomcat版本：9.0.13

1、安装gcc

yum -y installed gcc

2、安装redis

2.1、解压

tar -zxvf redis-5.0..tar.gz -C /usr/local/

2.2、进入redis安装目录

cd /usr/local/redis-5.0.

2.3、安装

make && make install

2.4、启动redis

/usr/local/redis-5.0./src/redis-server --protected-mode no &

3、安装jdk

3.1、查询已安装jdk

rpm -qa | grep jdk | grep -v grep

3.2、若为openjdk或者非1.8版本，则卸载

rpm -e --nodeps “具体安装jdk”

3.3、安装

rpm -ivh jdk-8u191-linux-x64.rpm

3.4、设置环境变量

/etc/profile中添加如下配置

export JAVA_HOME=/usr/java/jdk1..0_191-amd64/
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$PATH:$JAVA_HOME/bin/

3.5、使配置生效

source /etc/profile

4、安装tocmat

4.1、新建两个tocmat

tar -zxvf apache-tomcat-9.0..tar.gz -C /usr/local/
cd /usr/local/
mv apache-tomcat-9.0. tocmat1

tar -zxvf apache-tomcat-9.0..tar.gz -C /usr/local/
cd /usr/local/
mv apache-tomcat-9.0. tocmat2

4.2、配置tomcat端口

tomcat1 Connector port改为8081
tomcat2  server port改为8006，Connector port改为8082，AJP Connector port改为8010

如果有需要，可在tomcat/bin目录下新建setenv.sh文件，来设置内存大小等参数，也可在catalina.sh中直接设置,本例属于测试，未进行该设置

CATALINA_PID="$CATALINA_BASE/tomcat.pid"
JAVA_OPTS="-server -Xms1000m -Xmx1000m -XX:PermSize=128M -XX:MaxPermSize=128M"
export JAVA_OPTS
export JAVA_HOME=$JAVA_HOME

5、安装nginx

5.1、安装依赖包

yum install -y pcre pcre-devel
yum install -y zlib zlib-devel
yum install -y openssl openssl-devel

5.2、解压

tar -zxvf nginx-1.14..tar.gz

5.3、进入安装目录

cd nginx-1.14.

5.4、测试安装环境，默认将安装在/usr/local/nginx下

./configure

若configure未通过，则需要处理出现的异常，否则直接make && make install也是会出错

5.5、编译安装

make && install

5.6、检查是否安装成功

http://192.168.3.12

若启动正常，页面不能访问，则检查是否防火墙未关闭或者80端口未允许访问，关闭防火墙方法

systemctl stop firewalld

二、session共享和负载均衡配置

1、tocmat配置

1.1、在tomcat/conf/context.xml中增加RedissonSessionManager，tomcat1和tomcat2都要配置

<Manager className="org.redisson.tomcat.RedissonSessionManager"
configPath="${catalina.base}/redisson.conf" readMode="MEMORY" updateMode="DEFAULT"/>

具体参数可参考：

https://github.com/redisson/redisson/blob/dfcf183fb99e2718a748148942926256f650ee24/redisson-tomcat/README.md

配置redisson

1.2、在tomcat安装目录下新建redisson.conf,添加如下配置

{
   "singleServerConfig":{
      "idleConnectionTimeout":,
      "pingTimeout":,
      "connectTimeout":,
      "timeout":,
      "retryAttempts":,
      "retryInterval":,
      "password":null,
      "subscriptionsPerConnection":,
      "clientName":null,
      "address": "redis://127.0.0.1:6379",
      "subscriptionConnectionMinimumIdleSize":,
      "subscriptionConnectionPoolSize":,
      "connectionMinimumIdleSize":,
      "connectionPoolSize":,
      "database":,
      "dnsMonitoringInterval":
   },
   "threads":,
   "nettyThreads":,
   "codec":{
      "class":"org.redisson.codec.JsonJacksonCodec"
   },
   "transportMode":"NIO"
}

本例中使用的为单实例redis，具体参数配置可参考：
https://github.com/redisson/redisson/wiki/2.-Configuration#26-single-instance-mode
redis集群可参考如下链接中其他配置
https://github.com/redisson/redisson/wiki/2.-Configuration

1.3、拷贝jar包

https://github.com/redisson/redisson/tree/dfcf183fb99e2718a748148942926256f650ee24/redisson-tomcat下载redisson-all-3.9.1.jar和redisson-tomcat-9-3.9.1.jar，拷贝到${catalina.base}/lib下

分别启动tomcat1和tomcat2，验证是否可正常访问

http://192.168.3.12:8081/mytest/index.jsp
http://192.168.3.12:8082/mytest/index.jsp

1.4、nginx配置

修改nginx.conf配置

http节点中添加如下配置

upstream backend {
        server 127.0.0.1: max_fails= fail_timeout=10s;
        server 127.0.0.1: max_fails= fail_timeout=10s;
}

location节点中增加proxy_pass项

location / {
            root   html;
            index  index.html index.htm;
            proxy_pass http://backend;
        }

三、测试

1、tomcat1/webapps/新建目录mytest,mytest目录下新建index.jsp，内容如下

<%@ page language="java" %>
<html>
  <head><title>tomcat1</title></head>
  <body>
    <table align="centre" border="">
      <tr>
        <td>SessionID</td>
        <td><%= session.getId() %></td>
      </tr>
      <tr>
        <td>SessionCreatedTime</td>
        <td><%= session.getCreationTime() %></td>
     </tr>
     <tr>
        <td>ServerName</td>
        <td><%=request.getServerName()%></td>
     </tr>
     <tr>
        <td>SessionPort</td>
        <td><%=request.getServerPort()%></td>
     </tr>
      <tr>
        <td>CustomString</td>
        <td>This is the first tomcat</td>
     </tr>
    </table>
  </body>
</html>

2、tomcat2/webapps/新建目录mytest,mytest目录下新建index.jsp，内容如下

<%@ page language="java" %>
<html>
  <head><title>tomcat2</title></head>
  <body>
    <table align="centre" border="">
      <tr>
        <td>SessionID</td>
        <td><%= session.getId() %></td>
      </tr>
      <tr>
        <td>SessionCreatedTime</td>
        <td><%= session.getCreationTime() %></td>
     </tr>
     <tr>
        <td>ServerName</td>
        <td><%=request.getServerName()%></td>
     </tr>
     <tr>
        <td>SessionPort</td>
        <td><%=request.getServerPort()%></td>
     </tr>
      <tr>
        <td>CustomString</td>
        <td>This is the second tomcat</td>
     </tr>
    </table>
  </body>
</html>

3、重新启动redis，tomcat，nginx

4、输入地址访问

http://192.168.3.12/mytest/

5、结果

点击刷新按钮

可以发现，两次访问，SessionID都是相同的，并且title和自定义的字符串不一样，说明分别访问了tomcat1和tomcat2

登陆redis

redis-cli

输入以下命令可发现，session已经存放到了redis中，并且默认的超时时间为30 min