nginx + tomcat + redis 部署项目，解决session共享问题。

 最近自己搭了一套nginx的环境，集群部署了公司的一个项目，中间解决了session共享的问题。记录如下，以备日后查看。

1.环境  

 windows10 家庭中文版，jdk 7, tomcat 7.0.27 ,  nginx-1.10.1 windows,  Redis-x64-2.8.2402 windows.

tomcat 我拷贝了一份，并修改server.xml:

<Server port="8006" shutdown="SHUTDOWN">
  <!-- Security listener. Documentation at /docs/config/listeners.html
  <Listener className="org.apache.catalina.security.SecurityListener" />
  -->
  <!--APR library loader. Documentation at /docs/apr.html -->
  <Listener className="org.apache.catalina.core.AprLifecycleListener" SSLEngine="on" />
  <!--Initialize Jasper prior to webapps are loaded. Documentation at /docs/jasper-howto.html -->
  <Listener className="org.apache.catalina.core.JasperListener" />
  <!-- Prevent memory leaks due to use of particular java/javax APIs-->
  <Listener className="org.apache.catalina.core.JreMemoryLeakPreventionListener" />
  <Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener" />
  <Listener className="org.apache.catalina.core.ThreadLocalLeakPreventionListener" />

  <!-- Global JNDI resources
       Documentation at /docs/jndi-resources-howto.html
  -->
  <GlobalNamingResources>
    <!-- Editable user database that can also be used by
         UserDatabaseRealm to authenticate users
    -->
    <Resource name="UserDatabase" auth="Container"
              type="org.apache.catalina.UserDatabase"
              description="User database that can be updated and saved"
              factory="org.apache.catalina.users.MemoryUserDatabaseFactory"
              pathname="conf/tomcat-users.xml" />
  </GlobalNamingResources>

  <!-- A "Service" is a collection of one or more "Connectors" that share
       a single "Container" Note:  A "Service" is not itself a "Container",
       so you may not define subcomponents such as "Valves" at this level.
       Documentation at /docs/config/service.html
   -->
  <Service name="Catalina">

    <!--The connectors can use a shared executor, you can define one or more named thread pools-->
    <!--
    <Executor name="tomcatThreadPool" namePrefix="catalina-exec-"
        maxThreads="150" minSpareThreads="4"/>
    -->


    <!-- A "Connector" represents an endpoint by which requests are received
         and responses are returned. Documentation at :
         Java HTTP Connector: /docs/config/http.html (blocking & non-blocking)
         Java AJP  Connector: /docs/config/ajp.html
         APR (HTTP/AJP) Connector: /docs/apr.html
         Define a non-SSL HTTP/1.1 Connector on port 8080
    -->
    <Connector port="8081" protocol="HTTP/1.1"
               connectionTimeout="20000"
               redirectPort="8443" />
    <!-- A "Connector" using the shared thread pool-->
    <!--
    <Connector executor="tomcatThreadPool"
               port="8080" protocol="HTTP/1.1"
               connectionTimeout="20000"
               redirectPort="8443" />
    -->
    <!-- Define a SSL HTTP/1.1 Connector on port 8443
         This connector uses the JSSE configuration, when using APR, the
         connector should be using the OpenSSL style configuration
         described in the APR documentation -->
    <!--
    <Connector port="8443" protocol="HTTP/1.1" SSLEnabled="true"
               maxThreads="150" scheme="https" secure="true"
               clientAuth="false" sslProtocol="TLS" />
    -->

    <!-- Define an AJP 1.3 Connector on port 8009 -->
    <Connector port="8010" protocol="AJP/1.3" redirectPort="8443" />

这样，两个tmcat启起来就时两台服务器。

注意事项：windows用户必须用Administrator, 否则redis不能正常使用

2. redis依赖包

commons-pool2-2.2，jedis-2.5.2，tomcat-redis-session-manager-2.0.0 ，

注意事项：

如果使用jdk 6，启动时会提示 “java.lang.UnsupportedClassVersionError: com/orangefunction/tomcat/redissessions/RedisSessionHandlerValve : Unsupported major.minor version 51.0” , jdk7的版本号时51，所以应该是最小支持jdk7，其他版本的tomcat-redis-session-manager可能支持jdk的其他版本，大家自行实验。

3. nginx 主要配置

	#设定负载均衡的服务器列表
    upstream mysvr {
		server localhost:8080;
		server localhost:8081;
		#ip_hash;
	}
	
    server {
        listen       80; #监听端口 
        server_name  cq.demo.com; #域名可以有多个，用空格隔开  
        charset utf-8;
		
        #access_log  logs/host.access.log  main;

        location / {
			proxy_pass  http://mysvr;  #请求转向mysvr 定义的服务器列表
			proxy_set_header Host $host;
			proxy_set_header X-Real-IP $remote_addr;
			proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
			proxy_connect_timeout 10;
			proxy_read_timeout 10;
			proxy_send_timeout 10;
        }

        # redirect server error pages to the static page /50x.html
        #
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }
		
		#静态文件，nginx自己处理
		location ~ .*.(html|gif|jpg|jpeg|bmp|png|ico|txt|js|css|woff2|woff|ttf)$
		{	root html/static;
			#过期30天，静态文件不怎么更新，过期可以设大一点，如果频繁更新，则可以设置得小一点。
			expires 30d;
			#proxy_pass  http://mysvr; 
		}
    }

4. tomcat修改context.xml配置

Context标签加入：

<Valve className="com.orangefunction.tomcat.redissessions.RedisSessionHandlerValve" />
	<Manager className="com.orangefunction.tomcat.redissessions.RedisSessionManager"
			 host="localhost" 
			 port="6379" 
			 database="0" 
			 maxInactiveInterval="60" />

　　

先写到这，比较乱，没有按照操作顺序，只是记录了操作中的重点，其实操作顺序是次要的，解决操作中遇到的问题才是最重要的。