[{"data":1,"prerenderedAt":231},["ShallowReactive",2],{"tag-打开文件数-1":3},{"title":4,"articles":5,"hot_article":16,"month_arch":79,"total":227,"cover":228},"打开文件数 - 独孤影的博客",[6],{"id":7,"title":8,"uri":8,"author":9,"tags":10,"created_at":13,"view_count":14,"content":15},54,"linux打开文件数太多","duguying",[11,12],"linux","打开文件数","2017-04-28 17:36:42",3116,"\u003Cp>今天dus服务并发量稍高，然后程序内部不停地报错&nbsp;too many open files ，linux 系统对打开文件数是有限制的。介绍这个的文章很多。查看服务器上系统设置的最大限制，运维设置的是 102400，列出所有进程的打开文件数目&nbsp;\u003Cspan style=\"color: rgb(44, 44, 44); font-family: Arial; font-size: 14px; background-color: rgb(255, 255, 255);\">lsof -n|awk &#39;{print $2}&#39;|sort|uniq -c |sort -nr|more ，服务程序打开文件数最大时也才1w多，所有进程打开文件最大值加起来也才五六万，远远没有达到 102400，一直不解为何报这个错误，最后查看程序进程的限制 cat \u002Fproc\u002F32523\u002Flimits ，发现限定值居然是 1024\u003C\u002Fspan>\u003C\u002Fp>\u003Cpre class=\"brush:plain;toolbar:false\">Limit&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Soft&nbsp;Limit&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Hard&nbsp;Limit&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Units&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\nMax&nbsp;cpu&nbsp;time&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;unlimited&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;unlimited&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;seconds&nbsp;&nbsp;&nbsp;\nMax&nbsp;file&nbsp;size&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;unlimited&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;unlimited&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;bytes&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\nMax&nbsp;data&nbsp;size&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;unlimited&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;unlimited&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;bytes&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\nMax&nbsp;stack&nbsp;size&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8388608&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;unlimited&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;bytes&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\nMax&nbsp;core&nbsp;file&nbsp;size&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;unlimited&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;bytes&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\nMax&nbsp;resident&nbsp;set&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;unlimited&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;unlimited&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;bytes&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\nMax&nbsp;processes&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;31170&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;31170&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;processes&nbsp;\nMax&nbsp;open&nbsp;files&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1024&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4096&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;files&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\nMax&nbsp;locked&nbsp;memory&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;65536&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;65536&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;bytes&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\nMax&nbsp;address&nbsp;space&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;unlimited&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;unlimited&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;bytes&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\nMax&nbsp;file&nbsp;locks&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;unlimited&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;unlimited&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;locks&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\nMax&nbsp;pending&nbsp;signals&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;31170&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;31170&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;signals&nbsp;&nbsp;&nbsp;\nMax&nbsp;msgqueue&nbsp;size&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;819200&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;819200&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;bytes&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\nMax&nbsp;nice&nbsp;priority&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\nMax&nbsp;realtime&nbsp;priority&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;\nMax&nbsp;realtime&nbsp;timeout&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;unlimited&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;unlimited&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;us\u003C\u002Fpre>\u003Cp>\u003Cspan style=\"color: rgb(44, 44, 44); font-family: Arial; font-size: 14px; background-color: rgb(255, 255, 255);\">\u003C\u002Fspan>服务是通过 systemd 启动的，原来在 service 中有个设置项可以设置程序能打开的最大文件数，可是我的 service 文件中没有设置，于是默认限定为 1024，很容易就超了。修改添加配置项\u003C\u002Fp>\u003Cpre class=\"brush:plain;toolbar:false\">[Service]\nLimitCORE=infinity\nLimitNOFILE=102400\nLimitNPROC=102400\u003C\u002Fpre>\u003Cp>\u003Cspan style=\"color: rgb(44, 44, 44); font-family: Arial; font-size: 14px; background-color: rgb(255, 255, 255);\">重启服务，再次查看&nbsp;\u003Cspan style=\"color: rgb(44, 44, 44); font-family: Arial; font-size: 14px; background-color: rgb(255, 255, 255);\">cat \u002Fproc\u002F\u003C\u002Fspan>\u003Cspan style=\"color: rgb(44, 44, 44); font-family: Arial; font-size: 14px; background-color: rgb(255, 255, 255);\">32523\u002Flimits ，Max open files 成功变为 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