linux open files矽谷牛的耕田筆記在Facebook 的評價

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linux open files 在矽谷牛的耕田筆記 Facebook 的精選貼文

2021-07-09 08:00:07 有 50 人按讚

ref: https://medium.com/100-days-of-linux/how-to-deal-with-too-many-open-files-log-storm-c617ba84143b

本文是一個經驗分享文，作者分享其 HTTP Server 遇到 599: Network Connection Timed out Error 錯誤時的除錯經驗。

作者發現到該錯時，趕緊檢查 Server 的錯誤訊息然後得到了下列內容
HTTP: Accept error: accept tcp [::]:: accept4: too many open files

這個錯誤訊息非常明確，告知該 Server 開啟太多檔案了，導致沒有辦法繼續處理後續的網路請求。
不過對於不熟悉 Linux 系統設計的使用者來說這個錯誤訊息就不夠明顯，實際上 Linux 系統內所有的網路 Socket 底層都是一個又一個檔案結構(FD)，所以該錯誤訊息也可以解釋為該 Server 開啟了過多的 Socket ，已經超過系統設定上限。

作者使用下列指令來找到當前開啟的 Socket(FD) 數量
lsof -u | wc -l

為了解決這個問題，作者認為有兩個方向可以去嘗試
1. 提高整個 Server 能夠開啟的 Socket 數量上限
2. 確保 Server 將所有卡住沒使用的 Socket 都清除收回

後半部分文章作者介紹如何使用 ulimit 這個指令來觀察系統當前的設定，包含soft limit 以及 hard limit 兩種類型的差別，如何針對 socket 的部分來調高設定。

對於這方面有興趣的讀者可以閱讀一下，本篇文章滿短的，很快就可以消化完畢

Tags: linux open files

矽谷牛的耕田筆記

About author

目前工作內容主要以 DevOps 為主，本身是微軟 Cloud and Datacenter Management MVP，閒暇之餘會透過文章記錄所學，記錄於 https://www.hwchiu.com. 喜歡參加社群活動來學習不同的經驗，藉此增廣見聞目前主要參加的社群是 CNTUG，偶而會參加線上 Meetup ，透過網路的方式分享一些心得，並且錄影分享於 Youtube 上

工作與閒暇之餘的學習筆記，紀錄各式各樣的科技文章，同時分享自身部落格文章，線上社群演講以及線上課程資訊

社群媒體上有些相關的討論：

linux open files 在 How to open files using terminal - YouTube 的推薦與評價

Transcript · 60 Linux Commands you NEED to know (in 10 minutes) · 40 Windows Commands you NEED to know (in 10 Minutes) · 50 macOS Tips and Tricks ... ... <看更多>

linux open files 在 how to find the number of open files per process 的推薦與評價

On Linux, /proc/<pid>/fd is a special directory that contains one magic symlink file for each fd that the process has opened. ... <看更多>

linux open files 在 Too many open files in linux we are closing file descriptor 的推薦與評價

... <看更多>

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