更改nginx软件“进程最大可打开文件数”的设置

https://blog.csdn.net/huangbaokang/article/details/79917023 这篇博客只是操作系统级别的“进程最大可打开文件”的限制。

在nginx.conf文件中加入worker_rlimit_nofile配置

未加这个配置的时候，启动好了nginx服务，我们可以查看到当前nginx进程最大可打开的文件数。如下：

[root@localhost ~]# ps -ef|grep nginx
root        927      1  0 15:32 ?        00:00:00 nginx: master process /root/hbk/nginx2/sbin/nginx
root        928    927  0 15:32 ?        00:00:00 nginx: worker process
root        929    927  0 15:32 ?        00:00:00 nginx: worker process
root        930    927  0 15:32 ?        00:00:00 nginx: worker process
root        931    927  0 15:32 ?        00:00:00 nginx: worker process
root       1065   1049  0 15:34 pts/0    00:00:00 grep --color=auto nginx

在我这里，有1个master process和4个worker process,随便找一个进程查看：

[root@localhost ~]# cat /proc/928/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             3818                 3818                 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       3818                 3818                 signals   
Max msgqueue size         819200               819200               bytes     
Max nice priority         0                    0                    
Max realtime priority     0                    0                    
Max realtime timeout      unlimited            unlimited            us        

可以看出，未配置worker_rlimit_nofile，在我的linux下open files 显示的是

Max open files            1024                 4096   

配置改写

user 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 {
    worker_connections  65535;
}

主要是进行了两处改写，加上worker_rlimit_nofile 65535; 和设置worker_connections 65535;

重启nginx服务之后，再次验证。

[root@localhost nginx2]# sbin/nginx -s reload
[root@localhost nginx2]# ps -ef|grep nginx
root        927      1  0 15:32 ?        00:00:00 nginx: master process /root/hbk/nginx2/sbin/nginx
root       1098    927  2 15:52 ?        00:00:00 nginx: worker process
root       1099    927  2 15:52 ?        00:00:00 nginx: worker process
root       1100    927  2 15:52 ?        00:00:00 nginx: worker process
root       1101    927  2 15:52 ?        00:00:00 nginx: worker process
root       1103   1049  0 15:52 pts/0    00:00:00 grep --color=auto nginx
[root@localhost nginx2]# cat /proc/1100/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             3818                 3818                 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       3818                 3818                 signals   
Max msgqueue size         819200               819200               bytes     
Max nice priority         0                    0                    
Max realtime priority     0                    0                    
Max realtime timeout      unlimited            unlimited            us

可以看到，max open files 变成了65535了。温馨提示，在生产环境下，一定要确保Nginx工作进程的配置信息是经过优化的，否则Nginx对并发请求的处理能力将会大打折扣。