mac下nginx+tomcat+memcached集群配置和共享session

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mac下nginx+tomcat+memcached集群配置和共享session

参考文档 http://blog.csdn.net/shirdrn/article/details/9731215

首先分别安装nginx（版本1.5.8）、tomcat（版本7.0）、memcached（版本1.4.17），具体安装说明请分别参考下面的文章。

nginx安装说明 http://stephen830.iteye.com/blog/2002195

tomcat安装说明 http://stephen830.iteye.com/blog/2001939

部署多个tomcat http://stephen830.iteye.com/blog/2008789

在同一台机器上部署多个tomcat，请取消环境变量CATALINA_HOME

memcached安装说明 http://stephen830.iteye.com/blog/2009678

启动memcached ，开3个后台进程。

sudo ./memcached -p 11211 -m 64 -u root -d
sudo ./memcached -p 11311 -m 64 -u root -d
sudo ./memcached -p 11411 -m 64 -u root -d

Tomcat集群配置

Tomcat 集群配置，集群中各个结点通过共享存储在缓存Memcached中session来实现session的共享：如果有一台机器上的Tomcat服务停掉了，对于其他对等服务器上的session数据仍然可以从Memcached缓存中读取，从而不会发生session丢失的问题。

对于满足这种配置的实现方案，可以在https://code.google.com/p/memcached-session-manager和https://spymemcached.googlecode.com上下载相关的jar文件。因为基于不同的序列化方案，可以有多种配置方法，下面是选择Javolution序列化框架，需要提供如下库文件：

下载上述jar文件，拷贝到$CATALINA_HOME/lib目录下，然后需要配置$CATALINA_HOME/conf/server.xml文件。

Tomcat集群中，每个结点的$CATALINA_HOME/conf/server.xml基本配置都是相同的，不同配置内容分别如下：

如果在同一台机器上，要保证各个服务端口不相冲突
<Manager>元素中failoverNodes属性值不同

tomcat－01

   <Engine name="Catalina" defaultHost="localhost" jvmRoute="tomcat01">
      <Realm className="org.apache.catalina.realm.LockOutRealm">
        <Realm className="org.apache.catalina.realm.UserDatabaseRealm"
               resourceName="UserDatabase"/>
      </Realm>

      <Host name="localhost"  appBase="" unpackWARs="true" autoDeploy="true">
          <Context path="" docBase="/PROJECT_demo/demo" debug="0" reloadable="true">
              <!-- MySQL DBCP -->
              <Resource name="jdbc/demo" auth="Container" type="javax.sql.DataSource"
              driverClassName="com.mysql.jdbc.Driver" url="jdbc:mysql://localhost:3306/demo?useUnicode=true"
              username="demo" password="12345678" maxActive="100" maxIdle="30"
              maxWait="10000" />
<Manager className="de.javakaffee.web.msm.MemcachedBackupSessionManager"  
                                            memcachedNodes="n1:127.0.0.1:11211,n2:127.0.0.1:11311,n3:127.0.0.1:11411"  
                                            failoverNodes="n1"  
                                            requestUriIgnorePattern=".*\.(png|gif|jpg|css|js)$"  
                                            sessionBackupAsync="false"  
                                            sessionBackupTimeout="100"  
                             transcoderFactoryClass="de.javakaffee.web.msm.serializer.javolution.JavolutionTranscoderFactory"  
                             copyCollectionsForSerialization="false" />
          
          </Context>
        <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"
               prefix="www.nowagame.com." suffix=".txt"
               pattern="%h %l %u %t &quot;%r&quot; %s %b" />
      </Host>
    </Engine>

内容中的

<Engine name="Catalina" defaultHost="localhost" jvmRoute="tomcat01">

配置jvmRoute参数

memcachedNodes="n1:127.0.0.1:11211,n2:127.0.0.1:11311,n3:127.0.0.1:11411"

n1,n2,n3是对应的3个节点，127.0.0.1为ip，11211、11311、11411分别为memcached的端口号，与上面memcached的启动相对应。

failoverNodes="n1"

表明该tomcat的Memcached结点是n1，也就是说，如果tomcat01和n1在同一台机器上的话，session数据会优先复制到存储到Memcached结点n2、n3，这样即使n1所在的结点宕机了，n2、n3所在结点仍然存储了之前的session数据。

同样配置tomcat-02

   <Engine name="Catalina" defaultHost="localhost" jvmRoute="tomcat02">
      <Realm className="org.apache.catalina.realm.LockOutRealm">
        <Realm className="org.apache.catalina.realm.UserDatabaseRealm"
               resourceName="UserDatabase"/>
      </Realm>

      <Host name="localhost"  appBase="" unpackWARs="true" autoDeploy="true">
          <Context path="" docBase="/PROJECT_demo/demo" debug="0" reloadable="true">
              <!-- MySQL DBCP -->
              <Resource name="jdbc/demo" auth="Container" type="javax.sql.DataSource"
              driverClassName="com.mysql.jdbc.Driver" url="jdbc:mysql://localhost:3306/demo?useUnicode=true"
              username="demo" password="12345678" maxActive="100" maxIdle="30"
              maxWait="10000" />
<Manager className="de.javakaffee.web.msm.MemcachedBackupSessionManager"  
                                            memcachedNodes="n1:127.0.0.1:11211,n2:127.0.0.1:11311,n3:127.0.0.1:11411"  
                                            failoverNodes="n2"  
                                            requestUriIgnorePattern=".*\.(png|gif|jpg|css|js)$"  
                                            sessionBackupAsync="false"  
                                            sessionBackupTimeout="100"  
                             transcoderFactoryClass="de.javakaffee.web.msm.serializer.javolution.JavolutionTranscoderFactory"  
                             copyCollectionsForSerialization="false" />
          
          </Context>
        <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"
               prefix="www.nowagame.com." suffix=".txt"
               pattern="%h %l %u %t &quot;%r&quot; %s %b" />
      </Host>
    </Engine>

配置tomcat-03

   <Engine name="Catalina" defaultHost="localhost" jvmRoute="tomcat03">
      <Realm className="org.apache.catalina.realm.LockOutRealm">
        <Realm className="org.apache.catalina.realm.UserDatabaseRealm"
               resourceName="UserDatabase"/>
      </Realm>

      <Host name="localhost"  appBase="" unpackWARs="true" autoDeploy="true">
          <Context path="" docBase="/PROJECT_demo/demo" debug="0" reloadable="true">
              <!-- MySQL DBCP -->
              <Resource name="jdbc/demo" auth="Container" type="javax.sql.DataSource"
              driverClassName="com.mysql.jdbc.Driver" url="jdbc:mysql://localhost:3306/demo?useUnicode=true"
              username="demo" password="12345678" maxActive="100" maxIdle="30"
              maxWait="10000" />
<Manager className="de.javakaffee.web.msm.MemcachedBackupSessionManager"  
                                            memcachedNodes="n1:127.0.0.1:11211,n2:127.0.0.1:11311,n3:127.0.0.1:11411"  
                                            failoverNodes="n3"  
                                            requestUriIgnorePattern=".*\.(png|gif|jpg|css|js)$"  
                                            sessionBackupAsync="false"  
                                            sessionBackupTimeout="100"  
                             transcoderFactoryClass="de.javakaffee.web.msm.serializer.javolution.JavolutionTranscoderFactory"  
                             copyCollectionsForSerialization="false" />
          
          </Context>
        <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"
               prefix="www.nowagame.com." suffix=".txt"
               pattern="%h %l %u %t &quot;%r&quot; %s %b" />
      </Host>
    </Engine>

配置nginx.conf参数

user root owner;
worker_processes  1;

#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

#pid        logs/nginx.pid;

events {
    worker_connections  1024;
}

http {
    include       mime.types;
    default_type  application/octet-stream;

    #log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
    #                  '$status $body_bytes_sent "$http_referer" '
    #                  '"$http_user_agent" "$http_x_forwarded_for"';

    #access_log  logs/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    #keepalive_timeout  0;
    keepalive_timeout  65;

    #gzip  on;
    

	upstream tomcat_server {
	   server   127.0.0.1:8080;
           server   127.0.0.1:8081;
           server   127.0.0.1:8082;
	}
	
    server {
    	
    	
        listen       80;
        server_name  localhost;
        root    /PROJECT_demo/demo;
        
        location /{
        	index index.jsp;
        }
        
        location ~ \.(jsp|do)?$ {
	        proxy_set_header Host  $host;
	        proxy_set_header X-Forwarded-For  $remote_addr;
	        proxy_pass http://tomcat_server;
    	}
    	
    	location ~ .*\.(js|css|gif|jpg|jpeg|png|bmp|swf)$ {
	        expires 24h;
	    }
	    
        if (!-e $request_filename){
        	rewrite "^/games/game_([0-9]+)\.html$" /games/game_show.jsp?id=$1 last;
        	rewrite "^/games/page_([0-9]+)\.html$" /games/index.jsp?p=$1 last;
        	rewrite "^/games/category_([0-9]+)\.html$" /games/index.jsp?c=$1 last;
        	rewrite "^/games/category_([0-9]+)/page_([0-9]+)\.html$" /games/index.jsp?c=$1&p=$2 last;
        	rewrite "^/blogs/blog_([0-9]+)\.html$" /blogs/blog_show.jsp?id=$1 last;
        	rewrite "^/blogs/page_([0-9]+)\.html$" /blogs/index.jsp?p=$1 last;
        	rewrite "^/blogs/category_([0-9]+)\.html$" /blogs/index.jsp?c=$1 last;
        	rewrite "^/blogs/category_([0-9]+)/page_([0-9]+)\.html$" /blogs/index.jsp?c=$1&p=$2 last;
        	rewrite "^/links/category_([0-9]+)\.html$" /links/index.jsp?c=$1 last;
        }
    }
}

分别启动tomcat01,tomcat02,tomcat03,nginx，然后制作一个web页面，配合tomcat日志来观察session的变化情况。

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