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PHP Web应用程序抛出“打开的文件太多”

[英]PHP web application throwing “Too many open files”

原文 2012-11-15 06:30:24 8 2 php/ apache/ exec/ fopen/ shell-exec

I have a web application which uses php's native functions to write to files eg fopen() , fwrite() after writing to files at the end of the process, I close the file handle by doing fclose() . 我有一个Web应用程序，该程序使用php的本机函数在过程结束后写入文件后使用fopen() ， fwrite()文件进行写入，我通过执行fclose()关闭文件句柄。

The web application also uses exec() and shell_exec() at some places to execute external programs. 该Web应用程序还在某些地方使用exec()和shell_exec()来执行外部程序。

This web application is mostly deployed on Linux servers. 该Web应用程序主要部署在Linux服务器上。 Recently on a production server, we noted an issue where it was not able to write to a file and was throwing this error: 最近在生产服务器上，我们注意到了一个无法写入文件并引发此错误的问题：

"Too many open files" “打开的文件太多”

So my question is: Is it possible that doing the above operations (file writing and executing external commands via PHP) may have caused this and opened too many open files and I am getting this error now? 所以我的问题是：进行上述操作（通过PHP编写文件和执行外部命令）是否可能导致此问题并打开了太多打开的文件，而我现在收到此错误？

I have made sure that upon opening the file handles for writing / reading, I close them. 我确保打开用于写/读的文件句柄后，将它们关闭。

2 个解决方案

It is because you are exceeding the default number of open files. 这是因为您超出了打开文件的默认数量。 You can increase the maximum number of open files using ulimit . 您可以使用ulimit增加打开文件的最大数量。 Check this for more details. 检查此以获取更多详细信息。

Is it possible? 可能吗？ Sure. 当然。 It's even likely, since ulimit is a per-process limit. 甚至有可能，因为ulimit是每个进程的限制。

Maybe there's a flow issue that keeps your fclose code from running (like an exception, or an else block?). 也许有，让您的流量问题fclose代码运行（如异常，或者一个else块？）。

Do some debugging. 做一些调试。 Even something basic like incrementing a counter on fopen() and decrementing it on fclose() would be telling. 即使是一些基本的像递增）上的fopen计数器（和递减它FCLOSE（）会告诉。