打开文件：如何配置Nginx每个进程最多打开的文件数量

#查看目前资源限制的设定
ulimit -a
core file size   (blocks, -c) 0
data seg size   (kbytes, -d) unlimited
scheduling priority    (-e) 0
file size    (blocks, -f) unlimited
pending signals     (-i) 7268
max locked memory  (kbytes, -l) 64
max memory size   (kbytes, -m) unlimited
open files      (-n) 1024
pipe size   (512 bytes, -p) 8
POSIX message queues  (bytes, -q) 819200
real-time priority    (-r) 0
stack size    (kbytes, -s) 8192
cpu time    (seconds, -t) unlimited
max user processes    (-u) 7268
virtual memory   (kbytes, -v) unlimited
file locks      (-x) unlimited
#查看系统打开文件的最大限制数
ulimit -n
1024

#永久设置系统打开文件的最大限制数
vi /etc/security/limits.conf
#在最后添加参数
......
* soft nofile 102400
* hard nofile 102400

#临时设置系统打开文件的最大限制数
ulimit -n 102400

#测试操作，是否重启后永久加载配置
#系统重启
init 6
#测试成功，设置打开文件的最大限制数正确
ulimit -n
102400

vi /usr/local/nginx/conf/nginx.conf
user nginx;
worker_processes 4;
worker_cpu_affinity 0001 0010 0100 1000;
worker_rlimit_nofile 102400;
......
#检查nginx配置是否有问题
nginx -t
nginx: the configuration file /usr/local/nginx/conf/nginx.conf syntax is ok
nginx: configuration file /usr/local/nginx/conf/nginx.conf test is successful
#重新加载nginx
nginx -s reload