基于Redis实现Apache和Tomcat集群的Session共享配置

发表时间:2016-08-15 12:17 | 分类:Apache, Tomcat | 浏览:237 次

之前博主文章有介绍过apache和tomcat主备的配置步骤,在那个架构中,为了解决负载均衡时的session问题,apache配置里强制把session sticky在某个tomcat,或者直接使用主备。这样虽然可以解决不同的需求,但是如果项目更新或者重启tomcat,session肯定丢失,而且也不能实现项目的平滑更新。所以为了让tomcat可以承受更多并发,或者让tomcat更加高可用,或者对用户更加友好,维持session的方式有同步和共享两种。博主这里介绍session共享的配置,搭建统一session服务器。

一、安装Redis

安装参考上一篇文章:http://www.sijitao.net/2478.html

二、安装apache,两台tomcat

参考文章:

http://www.sijitao.net/1743.html

http://www.sijitao.net/1702.html

三、获取tomcat redis session manager

从网上下载下来的还是觉得不怎么靠谱,所以决定自己从源码打包。

1、获取第三方插件源码

git clone https://github.com/jcoleman/tomcat-redis-session-manager.git

2、源码构建基于gradle,所以需要先配置gradle环境,不要使用ubuntu下的apt方式安装。

root@ubuntu:~/softbak/# wget https://services.gradle.org/distributions/gradle-2.14.1-all.zip
root@ubuntu:~/softbak/# unzip gradle-2.14.1-all.zip
root@ubuntu:~/softbak/# mv gradle-2.14.1 /usr/local/
root@ubuntu:~/softbak/# cd /usr/local/
root@ubuntu:/usr/local# ln -s gradle-2.14.1 gradle
root@ubuntu:/usr/local# vi /etc/profile
root@ubuntu:/usr/local# #添加gradle的环境变量
root@ubuntu:/usr/local# gradle -v

------------------------------------------------------------
Gradle 2.14.1
------------------------------------------------------------

Build time:   2016-07-18 06:38:37 UTC
Revision:     d9e2113d9fb05a5caabba61798bdb8dfdca83719

Groovy:       2.4.4
Ant:          Apache Ant(TM) version 1.9.6 compiled on June 29 2015
JVM:          1.7.0_45 (Oracle Corporation 24.45-b08)
OS:           Linux 3.5.0-23-generic amd64

3、找到源码中的 build.gradle 文件,由于作者使用了第三方仓库(sonatype),需要注册帐号,太麻烦,注释后直接使用maven中央仓库,同时注释签名相关脚本并增加依赖包的输出脚本 copyJars(dist目录),修改后的 build.gradle 文件如下:

apply plugin: 'java'
apply plugin: 'maven'
apply plugin: 'signing'

group = 'com.orangefunction'
version = '2.0.0'

repositories {
  mavenCentral()
}

compileJava {
  sourceCompatibility = 1.7
  targetCompatibility = 1.7
}

dependencies {
  compile group: 'org.apache.tomcat', name: 'tomcat-catalina', version: '7.0.52'
  compile group: 'redis.clients', name: 'jedis', version: '2.5.2'
  compile group: 'org.apache.commons', name: 'commons-pool2', version: '2.2'
  //compile group: 'commons-codec', name: 'commons-codec', version: '1.9'

  testCompile group: 'junit', name: 'junit', version: '4.+'
  testCompile 'org.hamcrest:hamcrest-core:1.3'
  testCompile 'org.hamcrest:hamcrest-library:1.3'
  testCompile 'org.mockito:mockito-all:1.9.5'
  testCompile group: 'org.apache.tomcat', name: 'tomcat-coyote', version: '7.0.52'
}

task javadocJar(type: Jar, dependsOn: javadoc) {
  classifier = 'javadoc'
  from 'build/docs/javadoc'
}

task sourcesJar(type: Jar) {
  from sourceSets.main.allSource
  classifier = 'sources'
}

artifacts {
  archives jar

  archives javadocJar
  archives sourcesJar
}

//signing {
//  sign configurations.archives
//}

task copyJars(type: Copy) {
  from configurations.runtime
  into 'dist'  
}

uploadArchives {
  repositories {
    mavenDeployer {
      beforeDeployment { MavenDeployment deployment -> signing.signPom(deployment) }

      //repository(url: "https://oss.sonatype.org/service/local/staging/deploy/maven2/") {
      //  authentication(userName: sonatypeUsername, password: sonatypePassword)
      //}
      //repository(url: "https://oss.sonatype.org/content/repositories/snapshots") {
      //  authentication(userName: sonatypeUsername, password: sonatypePassword)
      //}

      pom.project {
        name 'tomcat-redis-session-manager'
        packaging 'jar'
        description 'Tomcat Redis Session Manager is a Tomcat extension to store sessions in Redis'
        url 'https://github.com/jcoleman/tomcat-redis-session-manager'

        issueManagement {
          url 'https://github.com:jcoleman/tomcat-redis-session-manager/issues'
          system 'GitHub Issues'
        }

        scm {
          url 'https://github.com:jcoleman/tomcat-redis-session-manager'
          connection 'scm:git:git://github.com/jcoleman/tomcat-redis-session-manager.git'
          developerConnection 'scm:git:git@github.com:jcoleman/tomcat-redis-session-manager.git'
        }

        licenses {
          license {
            name 'MIT'
            url 'http://opensource.org/licenses/MIT'
            distribution 'repo'
          }
        }

        developers {
          developer {
            id 'jcoleman'
            name 'James Coleman'
            email 'jtc331@gmail.com'
            url 'https://github.com/jcoleman'
          }
        }
      }
    }
  }
}

4、执行gradle命令构建源码,编译输出tomcat-redis-session-manager-master 及依赖jar包。

gradle build -x test  copyJars

tomcat-redis-session-manager

四、配置tomcat

1、分别将第三步生成的 tomcat-redis-session-manager-master 及依赖jar包覆盖到 tomcat 安装目录的 lib 文件夹。

2、分别修改2台 tomcat 的 context.xml 文件,使 tomcat-redis-session-manager-master 作为session管理器,同时指定redis地址和端口。

context.xml 增加类似以下配置:

    <!-- redis session manager -->
    <Valve className="com.orangefunction.tomcat.redissessions.RedisSessionHandlerValve" />
    <Manager className="com.orangefunction.tomcat.redissessions.RedisSessionManager"
        host="192.168.188.203"
        port="6379"
        database="0"
        maxInactiveInterval="60" />

有关配置的其他参数可以参考:https://github.com/izerui/tomcat-redis-session-manager

配置修改完成后分别重启tomcat 。

五、配置apache

apache的主要配置类似如下:

 
    #tomcat主备、负载均衡配置例子 开始
    ProxyRequests off
    ProxyPreserveHost On
    #Header add Set-Cookie "ROUTEID=.%{BALANCER_WORKER_ROUTE}e; path=/" env=BALANCER_ROUTE_CHANGED
    <Proxy balancer://www.sijitao.net>
        BalancerMember ajp://192.168.188.112:8009 route=node1 loadfactor=1
        BalancerMember ajp://192.168.188.112:9009 route=node2 loadfactor=1
        #ProxySet stickysession=JSESSIONID
        #ProxySet stickysession=ROUTEID
        #byrequests(default),bytraffic,bybusyness
        ProxySet lbmethod=byrequests
        ProxySet nofailover=On
    </Proxy>
    #不代理balancer目录
    ProxyPass /balancer !
    ProxyPass / balancer://www.sijitao.net/
    ProxyPassReverse / balancer://www.sijitao.net/
    #balancer目录,查看节点状态
    <Location /balancer>
        SetHandler balancer-manager
        Proxypass !
        Order allow,deny
        Allow from all
    </Location>
    <Proxy *>
        Order allow,deny
        Allow from all
    </Proxy>
    #tomcat主备、负载均衡配置例子 结束

重启apache服务。

六、添加测试页面

测试页面代码index.jsp:

<%@ page language="java" %>
<html>
  <head><title>Tomcat 1</title></head>
  <body>
    <h1><font color="green">Tomcat 1</font></h1>
    <table align="centre" border="1">
      <tr>
        <td>Session ID</td>
    <% session.setAttribute("www.sijitao.net","www.sijitao.net"); %>
        <td><%= session.getId() %></td>
      </tr>
      <tr>
        <td>Created on</td>
        <td><%= session.getCreationTime() %></td>
     </tr>
    </table>
  </body>
</html>

七、测试

创建好后就可以通过浏览器打开,可以看到tomcat集群生效,而且session保持不变。

20160815120638 20160815120659

redis中可以看到保存的session 。

20160815120902

参考连接:http://www.cnblogs.com/lengfo/p/4260363.html

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