基于nginx tomcat redis分布式web应用的session共享配置

　　nginx 作为目前最流行的开源反向代理HTTP Server，用于实现资源缓存、web server负载均衡等功能，由于其轻量级、高性能、高可靠等特点在互联网项目中有着非常普遍的应用，相关概念网上有丰富的介绍。分布式web server集群部署后需要实现session共享，针对 tomcat 服务器的实现方案多种多样，比如 tomcat cluster session 广播、nginx IP hash策略、nginx sticky module等方案，本文主要介绍了使用 redis 服务器进行 session 统一存储管理的共享方案。

　　相关应用结构参照下图：

　　

 

二、环境配置

　　测试环境基于 Linux CentOS 6.5，请先安装 tomcat、redis、nginx 相关环境，不作详细描述，本文测试配置如下：

	Version	IP_Port
nginx	1.6.2	10.129.221.70:80
tomcat_1	7.0.54	10.129.221.70:8080
tomcat_2	7.0.54	10.129.221.70:9090
redis	2.8.19	10.129.221.70:6379

 

三、构建 tomcat-redis-session-manager-master

　　1、由于源码构建基于 gradle，请先配置 gradle 环境。

　　2、从 github 获取 tomcat-redis-session-manager-master 源码，地址如下：

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

　　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: '7.0.27'
  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: '7.0.27'
}

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'
          }
        }
      }
    }
  }
}

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