Redis学习笔记~StackExchange.Redis实现分布式Session

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对于多WEB的环境现在已经是必须的了，很难想像一台WEB服务器面对百万并发的响应，所以，我们需要多台WEB服务器集群合作，来缓解这种高并发，高吞吐的场景，而对于多WEB的场景又会有个问题出现，即session存储的问题，如一个用户登陆后，把一个状态信息存储到当前WEB服务器的session里，而你请求其它页面时，很可能就被路由到另一台服务器了，这时，session也就丢了，而对于这种情况，有人把redis这个存储中间件想了起来，对它进行了封装，就有了今天基于redis的session共享机制。

下面说下安装方法

1 使用nuget安装redis缓存 StackExchange.Redis
2 使用nuget安装RedisSession服务　 RedisSessionStateProvider
3 从nuget添加RedisSession之后，它会在你的config文件中写入以下内容，主要是对session进行持久化设置的

<sessionState mode="Custom" customProvider="MySessionStateStore" timeout="30">
      <providers>
        <!-- Either use 'connectionString' and provide all parameters as string OR use 'host','port','accessKey','ssl','connectionTimeoutInMilliseconds' and 'operationTimeoutInMilliseconds'. -->
        <!-- 'throwOnError','retryTimeoutInMilliseconds','databaseId' and 'applicationName' can be used with both options. -->
        <!--
          <add name="MySessionStateStore"
            host = "127.0.0.1" [String]
            port = "" [number]
            accessKey = "" [String]
            ssl = "false" [true|false]
            throwOnError = "true" [true|false]
            retryTimeoutInMilliseconds = "5000" [number]
            databaseId = "0" [number]
            applicationName = "" [String]
            connectionTimeoutInMilliseconds = "5000" [number]
            operationTimeoutInMilliseconds = "1000" [number]
            connectionString = "<Valid StackExchange.Redis connection string>" [String]
            loggingClassName = "<Assembly qualified class name that contains logging method specified below>" [String]
            loggingMethodName = "<Logging method should be defined in loggingClass. It should be public, static, does not take any parameters and should have a return type of System.IO.TextWriter.>" [String]
          />
        -->
        <add name="MySessionStateStore" type="Microsoft.Web.Redis.RedisSessionStateProvider" host="127.0.0.1" accessKey="" ssl="false" />
      </providers>
    </sessionState>