基于Redis实现Apache和Tomcat集群的Session共享配置

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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

安装参考文章:http://paynexss.iteye.com/admin/blogs/2344807

二、安装apache,两台tomcat

参考文章:

http://paynexss.iteye.com/admin/blogs/2344076

http://paynexss.iteye.com/admin/blogs/2344075

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------------------------------------------------------------Gradle2.14.1------------------------------------------------------------Build time:2016-07-1806:38:37 UTC
Revision:     d9e2113d9fb05a5caabba61798bdb8dfdca83719

Groovy:2.4.4Ant:ApacheAnt(TM) version 1.9.6 compiled on June292015
JVM:1.7.0_45(OracleCorporation24.45-b08)
OS:Linux3.5.0-23-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:[email protected]: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 '[email protected]'
            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

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:

className="com.orangefunction.tomcat.redissessions.RedisSessionHandlerValve"/>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
    ProxyPreserveHostOn#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=1BalancerMember ajp://192.168.188.112:9009 route=node2 loadfactor=1#ProxySet stickysession=JSESSIONID#ProxySet stickysession=ROUTEID#byrequests(default),bytraffic,bybusynessProxySet lbmethod=byrequests
        ProxySet nofailover=OnProxy>#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
        Allowfrom all
    Location><Proxy*>Order allow,deny
        Allowfrom 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" %>
</span><span class="pln" style="margin: 0px; padding: 0px; color: #000000;">Tomcat 1</span><span class="tag" style="margin: 0px; padding: 0px; color: #000088;">

color="green">Tomcat 1

align="centre"border="1">Session ID<% session.setAttribute("www.sijitao.net","www.sijitao.net"); %> <%= session.getId() %>Created on<%= session.getCreationTime() %>

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。

 

redis中可以看到保存的session 。

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

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