设置Nginx进程最大可打开文件数

打开nginx.conf主配置文件。您需要配合worker_rlimit_nofile属性。如下：

user root root;
worker_processes 4;
worker_rlimit_nofile 65535;

#error_log logs/error.log;
#error_log logs/error.log notice;
#error_log logs/error.log info;

#pid logs/nginx.pid;
events {
        use epoll;
        worker_connections 65535;
}

请一定两个属性全部配置。配置完成后，请通过nginx -s reload命令重新启动Nginx。

验证是否生效

在linux系统中，所有的进程都会有一个临时的核心配置文件描述，存放路径在 /pro/进程号/limit。

首先我们来看一下，没有进行参数优化前的进程配置信息：

[root@localhost nginx]#  ps -elf | grep nginx
4 S root       2203   2031  0  80   0 - 46881 wait   22:18 pts/0    00:00:00 su nginx
4 S nginx      2204   2203  0  80   0 - 28877 wait   22:18 pts/0    00:00:00 bash
5 S root       2252      1  0  80   0 - 11390 sigsus 22:20 ?        00:00:00 nginx: master process /usr/local/nginx/sbin/nginx -c /usr/local/nginx/conf/nginx.conf
5 S nobody     2291   2252  0  80   0 - 11498 ep_pol 22:23 ?        00:00:00 nginx: worker process
5 S nobody     2292   2252  0  80   0 - 11498 ep_pol 22:23 ?        00:00:00 nginx: worker process
5 S nobody     2293   2252  0  80   0 - 11498 ep_pol 22:23 ?        00:00:00 nginx: worker process
5 S nobody     2294   2252  0  80   0 - 11498 ep_pol 22:23 ?        00:00:00 nginx: worker process
0 R root       2318   2299  0  80   0 - 28166 -      22:42 pts/0    00:00:00 grep --color=auto nginx

可以看到，nginx工作进程的进程号是：2291 2292 2293 2294。我们选择一个进程，查看其核心配置信息：

[root@localhost nginx]# cat /proc/2291/limits
Limit                     Soft Limit           Hard Limit           Units
Max cpu time              unlimited            unlimited            seconds
Max file size             unlimited            unlimited            bytes
Max data size             unlimited            unlimited            bytes
Max stack size            8388608              unlimited            bytes
Max core file size        0                    unlimited            bytes
Max resident set          unlimited            unlimited            bytes
Max processes             3829                 3829                 processes
Max open files            1024                 4096                 files
Max locked memory         65536                65536                bytes
Max address space         unlimited            unlimited            bytes
Max file locks            unlimited            unlimited            locks
Max pending signals       3829                 3829                 signals
Max msgqueue size         819200               819200               bytes
Max nice priority         0                    0
Max realtime priority     0                    0
Max realtime timeout      unlimited            unlimited            us

请注意其中的Max open files ，分别是1024和4096。那么更改配置信息，并重启Nginx后，配置信息就是下图所示了：

[root@localhost conf]# cat /proc/2351/limits
Limit                     Soft Limit           Hard Limit           Units
Max cpu time              unlimited            unlimited            seconds
Max file size             unlimited            unlimited            bytes
Max data size             unlimited            unlimited            bytes
Max stack size            8388608              unlimited            bytes
Max core file size        0                    unlimited            bytes
Max resident set          unlimited            unlimited            bytes
Max processes             3829                 3829                 processes
Max open files            65535                65535                files
Max locked memory         65536                65536                bytes
Max address space         unlimited            unlimited            bytes
Max file locks            unlimited            unlimited            locks
Max pending signals       3829                 3829                 signals
Max msgqueue size         819200               819200               bytes
Max nice priority         0                    0
Max realtime priority     0                    0
Max realtime timeout      unlimited            unlimited            us