8、旋转日志文件-阅读官方文档

官网： Controlling nginx

翻译部分：Rotating Log-files

开始！

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In order to rotate log files, they need to be renamed first.

 为了旋转日志文件，需要首先重命名它们。

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After that USR1 signal should be sent to the master process.

 之后，USR1信号应发送至主进程。

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The master process will then re-open all currently open log files and assign them an unprivileged user under which the worker processes are running, as an owner.

然后，主进程将重新打开所有当前打开的日志文件，并为它们分配一个工作进程运行时所使用的非特权用户作为所有者。 

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After successful re-opening, the master process closes all open files and sends the message to worker process to ask them to re-open files.

 成功重新打开后，主进程关闭所有打开的文件，并将消息发送给工作进程，要求它们重新打开文件。

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Worker processes also open new files and close old files right away.

 工作进程也立即打开新文件和关闭旧文件。

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As a result, old files are almost immediately available for post processing, such as compression.

 因此，旧文件几乎可以立即用于post处理，如压缩。