


Detailed explanation of using mod_status module to monitor apache service instances
##Parameter description:
字段 说明 Server Version Apache 服务器的版本。 Server Built Apache 服务器编译安装的时间。 Current Time 目前的系统时间。 Restart Time Apache 重新启动的时间。 Parent Server Generation Apache 父程序 (parent process) 的世代编号,就是 httpd 接收到 SIGHUP 而重新启动的次数。 Server uptime Apache 启动后到现在经过的时间。 Total accesses 到目前为此 Apache 接收的联机数量及传输的数据量。 CPU Usage 目前 CPU 的使用情形。 _SWSS.... 所有 Apache process 目前的状态。每一个字符表示一个程序,最多可以显示 256 个程序的状态。 Scoreboard Key 上述状态的说明。以下为每一个字符符号所表示的意义: * _:等待连结中。 * S:启动中。 * R:正在读取要求。 * W:正在送出回应。 * K:处于保持联机的状态。 * D:正在查找DNS。 * C:正在关闭连结。 * L:正在写入记录文件。 * G:进入正常结束程序中。 * I:处理闲置。 * .:尚无此程序。 Srv 本程序与其父程序的世代编号。 PID 本程序的process id。 Acc 分别表示本次联机、本程序所处理的存取次数。 M 该程序目前的状态。 CPU 该程序所耗用的CPU资源。 SS 距离上次处理要求的时间。 Req 最后一次处理要求所耗费的时间,以千分之一秒为单位。 Conn 本次联机所传送的数据量。 Child 由该子程序所传送的数据量。 Slot 由该 Slot 所传送的数据量。 Client 客户端的地址。 VHost 属于哪一个虚拟主机或本主机的IP。 Request 联机所提出的要求信息。
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Absolute session timeout starts at the time of session creation, while an idle session timeout starts at the time of user's no operation. Absolute session timeout is suitable for scenarios where strict control of the session life cycle is required, such as financial applications; idle session timeout is suitable for applications that want users to keep their session active for a long time, such as social media.

The server session failure can be solved through the following steps: 1. Check the server configuration to ensure that the session is set correctly. 2. Verify client cookies, confirm that the browser supports it and send it correctly. 3. Check session storage services, such as Redis, to ensure that they are running normally. 4. Review the application code to ensure the correct session logic. Through these steps, conversation problems can be effectively diagnosed and repaired and user experience can be improved.

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