Redis+Tomcat实现session绑定

时间 2020-10-24

标签 html java nginx git github web redis apache vim centos 栏目 Redis 繁體版

原文原文链接

1.实验环境

实验系统：四台CentOS7.4，其中一台Nginx反向代理服务器，两台Tomcat服务器，一台Redis
实验目的：为了可以让客户端访问时，无论反向代理服务器代理到哪一个服务器上均可以上客户端获得相同的数据，因此就应该有专用于存放session的服务器，Redis就能够充当次服务器
实现拓扑图：

实验步骤：html

Nginx代理配置

[root@nginx ~]# yum install -y nginx
[root@nginx ~]# vim /etc/nginx/conf.d/nginx.conf
upstream web {
        server 192.168.1.162:8080;
        server 192.168.1.161:8080;
}
server {
        listen 80;
        server_name nginx.lin.com;
        root /app/web/;
        index index.jsp index.html;
        location / {
                proxy_pass http://web;
        }
}
[root@nginx ~]# systemctl start nginx

Tomcat1

[root@tomcat1 ~]# yum install -y tomcat tomcat-admin-webapps.noarch tomcat-webapps.noarch tomcat-docs-webapp.noarch java-1.8.0-openjdk-devel 
[root@tomcat1 ~]# vim /etc/tomcat/server.xml
    <Engine name="Catalina" defaultHost="tomcat2.lin.com" jvmRoute="jvm2">
    <Host name="tomcat2.lin.com" appBase="/app/web/"
                unpackWARs="true" autoDeploy="true">
   </Host>
[root@tomcat1 ~]# mkdir /app/web/ROOT/META-INF/ -p
[root@tomcat1 ~]# cp /etc/tomcat/context.xml /app/web/ROOT/META-INF/
[root@tomcat1 ~]# vim /app/web/ROOT/META-INF/context.xml 
<Context>

    <!-- Default set of monitored resources -->
    <WatchedResource>WEB-INF/web.xml</WatchedResource>
<Valve className="com.orangefunction.tomcat.redissessions.RedisSessionHandlerValve" />
<Manager className="com.orangefunction.tomcat.redissessions.RedisSessionManager"
         host="192.168.1.149"
         port="6379" 
         database="0"
        password="123456" 
         maxInactiveInterval="60" />
    <!-- Uncomment this to disable session persistence across Tomcat restarts -->
    <!--
    <Manager pathname="" />
    -->

    <!-- Uncomment this to enable Comet connection tacking (provides events
         on session expiration as well as webapp lifecycle) -->
    <!--
    <Valve className="org.apache.catalina.valves.CometConnectionManagerValve" />
    -->

</Context>

测试页面建立java

[root@tomcat1 ROOT]# vim /app/web/ROOT/index.jsp 
<%@ page language="java" %>
                                        <html>
                                                <head><title>TomcatA</title></head>
                                                <body>
                                                        <h1><font color="red">TomcatA.magedu.com</font></h1>
                                                        <table align="centre" border="1">
                                                                <tr>
                                                                        <td>Session ID</td>
                                                                <% session.setAttribute("magedu.com","magedu.com"); %>
                                                                        <td><%= session.getId() %></td>
                                                                </tr>
                                                                <tr>
                                                                        <td>Created on</td>
                                                                        <td><%= session.getCreationTime() %></td>
                                                                </tr>
                                                        </table>
                                                </body>
                                        </html>

Tomcat2

[root@tomcat2 ~]# yum install -y tomcat tomcat-admin-webapps.noarch tomcat-webapps.noarch tomcat-docs-webapp.noarch java-1.8.0-openjdk-devel 
[root@tomcat2 ~]# vim /etc/tomcat/server.xml
    <Engine name="Catalina" defaultHost="tomcat2.lin.com" jvmRoute="jvm2">
    <Host name="tomcat2.lin.com" appBase="/app/web/"
                unpackWARs="true" autoDeploy="true">
   </Host>
[root@tomcat2 ~]# mkdir /app/web/ROOT/META-INF/ -p
[root@tomcat2 ~]# cp /etc/tomcat/context.xml /app/web/ROOT/META-INF
[root@tomcat2 ~]# vim /app/web/ROOT/META-INF/context.xml 
<Context>

    <!-- Default set of monitored resources -->
    <WatchedResource>WEB-INF/web.xml</WatchedResource>
<Valve className="com.orangefunction.tomcat.redissessions.RedisSessionHandlerValve" />
<Manager className="com.orangefunction.tomcat.redissessions.RedisSessionManager"
         host="192.168.1.149"
         port="6379" 
         database="0"
        password="123456" 
         maxInactiveInterval="60" />
    <!-- Uncomment this to disable session persistence across Tomcat restarts -->
    <!--
    <Manager pathname="" />
    -->

    <!-- Uncomment this to enable Comet connection tacking (provides events
         on session expiration as well as webapp lifecycle) -->
    <!--
    <Valve className="org.apache.catalina.valves.CometConnectionManagerValve" />
    -->

</Context>

测试页面建立nginx

[root@tomcat1 ROOT]# vim /app/web/ROOT/index.jsp 
<%@ page language="java" %>
                                        <html>
                                                <head><title>TomcatB</title></head>
                                                <body>
                                                        <h1><font color="red">TomcatB.magedu.com</font></h1>
                                                        <table align="centre" border="1">
                                                                <tr>
                                                                        <td>Session ID</td>
                                                                <% session.setAttribute("magedu.com","magedu.com"); %>
                                                                        <td><%= session.getId() %></td>
                                                                </tr>
                                                                <tr>
                                                                        <td>Created on</td>
                                                                        <td><%= session.getCreationTime() %></td>
                                                                </tr>
                                                        </table>
                                                </body>
                                        </html>

tomcat两台服务器上须要的jar包有：tomcat-redis-session-manager-2.0.0.jar、jedis-2.9.0.jar、commons-pool2-2.2.jar，能够从github中下载
将以上的三个jar包复制到/usr/share/tomcat/lib/目录下
最后重启服务git

Redis缓存

[root@redis ~]# yum install -y redis
[root@redis ~]# vim /etc/redis.conf
bind 0.0.0.0
requirepass centos
[root@tomcat2 ~]# systemctl start redis

测试结果

redis服务器查询github

127.0.0.1:6379> KEYS *
1) "2089214D59A2D2B1A76EE031C4D73FA8.jvm1.jvm1"
2) "8B8BA3B5715A5F0AC08E7223800E356C.jvm1.jvm1"
3) "9A9631C00441246A879E52A09295846C.jvm1.jvm1"
4) "61B59A937639E0CE8629A82A239BEE1B.jvm1.jvm1"
5) "mykey"
6) "905A1924350D75D599A4723F5D2D6CC9.jvm1.jvm1"

注意项说明：
1.注意三个jar包的版本，有些版本可能会不支持
2.注意redis是能够让其余服务器的访问web