nginx配置详解与优化-优快云博客

本文链接：https://blog.youkuaiyun.com/YSTWD_WY/article/details/120983160

本文详细介绍了nginx的配置文件结构，包括默认配置文件、服务控制方式、配置参数解析。重点讲解了nginx.conf中的main、event和http配置段，以及如何调整worker_processes、worker_connections等关键参数以优化性能。同时，文章还提到了错误日志的管理和fastcgi的相关配置，对于理解和配置nginx服务器具有指导意义。

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nginx配置

nginx默认配置文件

[root@server1 conf]# pwd
/usr/local/nginx/conf
[root@server1 conf]# ls
fastcgi.conf            nginx.conf
fastcgi.conf.default    nginx.conf.default
fastcgi_params          scgi_params
fastcgi_params.default  scgi_params.default
koi-utf                 uwsgi_params
koi-win                 uwsgi_params.default
mime.types              win-utf
mime.types.default

nginx服务控制方式

//服务控制方式，使用nginx命令
    -t  //检查配置文件语法
    -v  //输出nginx的版本
    -c  //指定配置文件的路径
    -s  //发送服务控制信号，可选值有{stop|quit|reopen|reload}

检查语法：-t

[root@server1 ~]# 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
[root@server1 ~]#

nginx版本：-v

[root@server1 ~]# nginx -v
nginx version: nginx/1.20.1

指定配置文件路径： -c

[root@server1 conf]# pwd
/usr/local/nginx/conf
#把默认配置文件备份到另一个目录
[root@server1 conf]# cp nginx.conf mime.types /opt/test/
[root@server1 conf]# ls /opt/test/
mime.types  nginx.conf

#查看默认配置文件有4个worker_processes进程
[root@server1 conf]# head -5 nginx.conf

#user  nobody;
worker_processes  4;

#error_log  logs/error.log;


[root@server1 conf]# ps -ef | grep nginx
root      255627       1  0 16:06 ?        00:00:00 nginx: master process nginx
nginx     255628  255627  0 16:06 ?        00:00:00 nginx: worker process
nginx     255629  255627  0 16:06 ?        00:00:00 nginx: worker process
nginx     255630  255627  0 16:06 ?        00:00:00 nginx: worker process
nginx     255631  255627  0 16:06 ?        00:00:00 nginx: worker process
root      263190    1511  0 16:08 pts/0    00:00:00 grep --color=auto nginx



[root@server1 ~]# head -5 /opt/test/nginx.conf 

#user  nobody;
worker_processes  1;

#error_log  logs/error.log;

[root@server1 ~]# nginx -s stop;nginx -c /opt/test/nginx.conf 
[root@server1 ~]# ps -ef | grep nginx
root      266383       1  0 16:09 ?        00:00:00 nginx: master process nginx -c /opt/test/nginx.conf
nginx     266384  266383  0 16:09 ?        00:00:00 nginx: worker process
root      266766    1511  0 16:09 pts/0    00:00:00 grep --color=auto nginx

发送服务控制信号：-s

停止服务 stop

[root@server1 ~]# nginx -s stop
[root@server1 ~]# ps -ef | grep nginx
root      333600    1511  0 16:27 pts/0    00:00:00 grep --color=auto nginx
[root@server1 ~]# ss -antl
State    Recv-Q   Send-Q       Local Address:Port                     Peer Address:Port                 
LISTEN   0        128                0.0.0.0:22                            0.0.0.0:*                    
LISTEN   0        128                   [::]:22                               [::]:*

退出服务：quit

[root@server1 ~]# ps -ef | grep nginx
root      341196       1  0 16:30 ?        00:00:00 nginx: master process nginx
nginx     341197  341196  0 16:30 ?        00:00:00 nginx: worker process
nginx     341198  341196  0 16:30 ?        00:00:00 nginx: worker process
nginx     341199  341196  0 16:30 ?        00:00:00 nginx: worker process
nginx     341200  341196  0 16:30 ?        00:00:00 nginx: worker process
root      341923    1511  0 16:30 pts/0    00:00:00 grep --color=auto nginx

[root@server1 ~]# nginx -s quit
[root@server1 ~]# ps -ef | grep nginx
root      346758    1511  0 16:31 pts/0    00:00:00 grep --color=auto nginx

重新加载文件：reload

[root@server1 ~]# ps -ef | grep nginx
root      355450       1  0 16:33 ?        00:00:00 nginx: master process nginx
nginx     355451  355450  0 16:33 ?        00:00:00 nginx: worker process
nginx     355452  355450  0 16:33 ?        00:00:00 nginx: worker process
nginx     355453  355450  0 16:33 ?        00:00:00 nginx: worker process
nginx     355454  355450  0 16:33 ?        00:00:00 nginx: worker process
root      355606    1511  0 16:34 pts/0    00:00:00 grep --color=auto nginx
[root@server1 ~]# vim /usr/local/nginx/conf/nginx.conf
[root@server1 ~]# head -5 /usr/local/nginx/conf/nginx.conf

#user  nobody;
worker_processes  2;  #原本有四个worker process进程现在改为两个

#error_log  logs/error.log;
[root@server1 ~]# nginx -s reload    #重新加载
[root@server1 ~]# ps -ef | grep nginxroot      355450       1  0 16:33 ?        00:00:00 nginx: master process nginx
nginx     358912  355450  0 16:34 ?        00:00:00 nginx: worker process
nginx     358913  355450  0 16:34 ?        00:00:00 nginx: worker process
root      359145    1511  0 16:34 pts/0    00:00:00 grep --color=auto nginx

nginx的配置文件详解

主配置文件：/usr/local/nginx/conf/nginx.conf

默认启动nginx时，使用的配置文件是：安装路径/conf/nginx.conf文件
可以在启动nginx时通过-c选项来指定要读取的配置文件

nginx常见的配置文件及其作用

配置文件	作用
nginx.conf	nginx的基本配置文件
mime.types	MIME类型关联的扩展文件
fastcgi.conf	与fastcgi相关的配置
proxy.conf	与proxy相关的配置
sites.conf	配置nginx提供的网站，包括虚拟主机

nginx.conf配置详解

nginx.conf的内容分为以下几段：

main配置段：全局配置段。其中main配置段中可能包含event配置段
event {}：定义event模型工作特性
http {}：定义http协议相关的配置

配置指令：要以分号结尾，语法格式如下：

derective value1 [value2 ...];

支持使用变量：

内置变量：模块会提供内建变量定义
自定义变量：set var_name value

用于调试、定位问题的配置参数

daemon {on|off};    //是否以守护进程方式运行nginx，调试时应设置为off
master_process {on|off};    //是否以master/worker模型来运行nginx，调试时可以设置为off
error_log 位置 级别;    //配置错误日志

error_log里的位置和级别能有以下可选项：

位置	级别
file stderr syslog:server=address[,parameter=value] memory:size	debug：若要使用debug级别，需要在编译nginx时使用–with-debug选项 info notice warn error crit alert emerg

开启错误日志

[root@serevr1 ~]# vim   /usr/local/nginx/conf/nginx.conf
#user  nobody;
worker_processes  2;

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

查看错误日志位置

[root@serevr1 nginx]# pwd
/var/log/nginx
[root@serevr1 nginx]# ls
access.log  cat  error.log
[root@serevr1 nginx]# cat  error.log 
2021/10/26 17:08:47 [notice] 373309#0: signal process started
2021/10/26 19:29:56 [notice] 227608#0: signal process started
2021/10/26 19:30:33 [error] 227612#0: *1 open() "/usr/local/nginx/html/favicon.ico" failed (2: No such file or directory), client: 192.168.244.1, server: localhost, request: "GET /favicon.ico HTTP/1.1", host: "192.168.244.133", referrer: "http://192.168.244.133/"

清空错误日志并改日志级别为debug

[root@serevr1 nginx]# > error.log 
[root@serevr1 nginx]# cat error.log 

[root@serevr1 ~]# vim   /usr/local/nginx/conf/nginx.conf
#user  nobody;
worker_processes  2;

#error_log  logs/error.log;
#error_log  logs/error.log  notice;
error_log  logs/error.log error ;
#重启服务
[root@serevr1 ~]# systemctl restart nginx
#查看错误日志
[root@serevr1 nginx]# cat error.log 
2021/10/26 20:16:18 [notice] 331720#0: signal process started
2021/10/26 20:18:21 [notice] 343000#0: signal process started

正常运行必备的配置参数

user USERNAME [GROUPNAME];    //指定运行worker进程的用户和组
pid /path/to/pid_file;    //指定nginx守护进程的pid文件
worker_rlimit_nofile number;    //设置所有worker进程最大可以打开的文件数，默认为1024
worker_rlimit_core size;    //指明所有worker进程所能够使用的总体的最大核心文件大

user 指定运行worker进程的用户和组

[root@serevr1 ~]# head -5  /usr/local/nginx/conf/nginx.conf

user  nginx nginx;  #修改为nginx用户  nginx组
worker_processes  2;

#error_log  logs/error.log;

重启nginx服务
[root@serevr1 ~]# systemctl restart nginx



[root@serevr1 ~]# ps -ef  | grep nginx
root      367359       1  0 20:22 ?        00:00:00 nginx: master process /usr/local/nginx/sbin/nginx
nginx     367360  367359  0 20:22 ?        00:00:00 nginx: worker process
nginx     367361  367359  0 20:22 ?        00:00:00 nginx: worker process
root      368896  300727  0 20:23 pts/2    00:00:00 grep --color=auto nginx

pid 指定nginx守护进程的pid文件

[root@serevr1 ~]# head -10   /usr/local/nginx/conf/nginx.conf

user  nginx nginx;
worker_processes  2;

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

pid        logs/nginx.pid;

[root@serevr1 ~]# nginx -s reload
[root@serevr1 ~]# 
[root@serevr1 ~]# ls /usr/local/nginx/logs/
error.log  nginx.pid
[root@serevr1 ~]# nginx -s stop
[root@serevr1 ~]# ls /usr/local/nginx/logs/
error.log

worker_rlimit_nofile number 设置所有worker进程最大可以打开的文件数，默认为1024

修改worker进程的最大打开文件数限制(RLIMIT_NOFILE)在不重启主进程的情况下增加限制。

一个worker进程可以处理的请求数量



user  nginx nginx;
worker_processes  2;

worker_rlimit_nofile 10240; #一般设置为10240

优化性能的配置参数

worker_processes n;    //启动n个worker进程，这里的n为了避免上下文切换，通常设置为cpu总核心数-1或等于总核心数
worker_cpu_affinity cpumask ...;    //将进程绑定到某cpu中，避免频繁刷新缓存
//cpumask：使用8位二进制表示cpu核心，如：
    0000 0001   //第一颗cpu核心
    0000 0010   //第二颗cpu核心
    0000 0100   //第三颗cpu核心
    0000 1000   //第四颗cpu核心
    0001 0000   //第五颗cpu核心
    0010 0000   //第六颗cpu核心
    0100 0000   //第七颗cpu核心
    1000 0000   //第八颗cpu核心
timer_resolution interval;    //计时器解析度。降低此值，可减少gettimeofday()系统调用的次数
worker_priority number;    //指明worker进程的nice值

[root@serevr1 ~]# head -10  /usr/local/nginx/conf/nginx.conf

user  nginx nginx;
worker_processes  2;

worker_rlimit_nofile 10240;
worker_cpu_affinity auto ;     #添加此行

[root@serevr1 conf]# vim  nginx.conf
[root@serevr1 conf]# 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
[root@serevr1 conf]# 
[root@serevr1 conf]# nginx -s reload

添加核心数

[root@serevr1 ~]# vim /usr/local/nginx/conf/nginx.conf
.......
worker_cpu_affinity 0001 0010 0100;
[root@serevr1 ~]# nginx -s stop 
[root@serevr1 ~]# nsinx

查看nginx在哪个核心上运行

[root@serevr1 ~]# top 
top - 21:15:45 up 24 min,  6 users,  load average: 0.47, 0.27, 0.19
Tasks: 243 total,   3 running, 240 sleeping,   0 stopped,   0 zombie
%Cpu(s):  2.1 us,  6.0 sy,  0.0 ni, 91.2 id,  0.0 wa,  0.3 hi,  0.3 si,  0.0 st
MiB Mem :   2807.5 total,   2056.3 free,    445.9 used,    305.3 buff/cache
MiB Swap:   2092.0 total,   2092.0 free,      0.0 used.   2196.1 avail Mem 
Locate string      #按 L(大写)  搜索nginx       

Locate string nginx


top - 21:17:46 up 26 min,  6 users,  load average: 0.45, 0.31, 0.20
Tasks: 241 total,   1 running, 240 sleeping,   0 stopped,   0 zombie
%Cpu(s):  1.2 us,  4.1 sy,  0.0 ni, 94.4 id,  0.0 wa,  0.2 hi,  0.2 si,  0.0 st
MiB Mem :   2807.5 total,   2058.1 free,    443.5 used,    306.0 buff/cache
MiB Swap:   2092.0 total,   2092.0 free,      0.0 used.   2198.5 avail Mem 

    PID USER      PR  NI    VIRT    RES    SHR S  %CPU  %MEM     TIME+ COMMAND                                            
  41416 nginx     20   0  111724   6260   4660 S   0.0   0.2   0:00.00 nginx                                              
  41417 nginx     20   0  111724   5884   4536 S   0.0   0.2   0:00.00 nginx                                              
  52985 root      20   0       0      0      0 I   0.0   0.0   0:00.25 kworker/1:1-mm_percpu_wq                           
  75633 root      20   0       0      0      0 I   0.0   0.0   0:00.06 kworker/2:3-events_freezable                       
  81214 root      20   0       0      0      0 I   0.0   0.0   0:00.02 kworker/3:2-xfs-cil/dm-0                           
  84670 root      20   0       0      0      0 I   0.0   0.0   0:00.14 kworker/1:2-events_power_efficient                 
  95367 root      20   0       0      0      0 I   0.0   0.0   0:00.05 kworker/u256:1-events_unbound                      
 111598 root      20   0       0      0      0 I   0.0   0.0   0:00.01 kworker/3:1-xfs-sync/dm-0                          
 113156 root      20   0       0      0      0 I   0.0   0.0   0:00.26 kworker/1:0-events                                 
 122477 root      20   0   61736   4580   3672 R   0.0   0.2   0:00.06 top                                                
 133755 root      20   0   15128   3328   3000 S   0.0   0.1   0:00.00 bash                                               
 133756 root      20   0   15128   3336   3000 S   0.0   0.1   0:00.00 bash                                               
 133757 root      20   0   15128   3324   2988 S   0.0   0.1   0:00.00 bash                                               
 133800 root      20   0    4732    856    784 S   0.0   0.0   0:00.00 sleep

然后按 f 键

Fields Management for window 1:Def, whose current so
   Navigate with Up/Dn, Right selects for move then 
   'd' or <Space> toggles display, 's' sets sort.  U

* PID     =    SUID    =    nDRT    =    nsPID   = 
* USER    =    SUSER   =    WCHAN   =    nsUSER  = 
* PR      =    GID     =    Flags   =    nsUTS   = 
* NI      =    GROUP   =    CGROUPS =    LXC     = 
* VIRT    =    PGRP    =    SUPGIDS =    RSan    = 
* RES     =    TTY     =    SUPGRPS =    RSfd    = 
* SHR     =    TPGID   =    TGID    =    RSlk    = 
* S       =    SID     =    OOMa    =    RSsh    = 
* %CPU    =    nTH     =    OOMs    =    CGNAME  = 
* %MEM    =    P       =    ENVIRON =    NU      = 
* TIME+   =    TIME    =    vMj     = 
* COMMAND =    SWAP    =    vMn     = 
  PPID    =    CODE    =    USED    = 
  UID     =    DATA    =    nsIPC   = 
  RUID    =    nMaj    =    nsMNT   = 
  RUSER   =    nMin    =    nsNET   =

找到 P 后空格选中

Fields Management for window 1:Def, whose current so
   Navigate with Up/Dn, Right selects for move then 
   'd' or <Space> toggles display, 's' sets sort.  U

* PID     =    SUID    =    nDRT    =    nsPID   = 
* USER    =    SUSER   =    WCHAN   =    nsUSER  = 
* PR      =    GID     =    Flags   =    nsUTS   = 
* NI      =    GROUP   =    CGROUPS =    LXC     = 
* VIRT    =    PGRP    =    SUPGIDS =    RSan    = 
* RES     =    TTY     =    SUPGRPS =    RSfd    = 
* SHR     =    TPGID   =    TGID    =    RSlk    = 
* S       =    SID     =    OOMa    =    RSsh    = 
* %CPU    =    nTH     =    OOMs    =    CGNAME  = 
* %MEM    =  * P       =    ENVIRON =    NU      = 
* TIME+   =    TIME    =    vMj     = 
* COMMAND =    SWAP    =    vMn     = 
  PPID    =    CODE    =    USED    = 
  UID     =    DATA    =    nsIPC   = 
  RUID    =    nMaj    =    nsMNT   = 
  RUSER   =    nMin    =    nsNET   = 
#就会选中

q 键返回显示结果

top - 21:22:21 up 30 min,  6 users,  load average: 0.79, 0.47, 0.29
Tasks: 241 total,   1 running, 240 sleeping,   0 stopped,   0 zombie
%Cpu(s):  1.4 us,  4.3 sy,  0.0 ni, 94.0 id,  0.0 wa,  0.2 hi,  0.2 si,  0.0 st
MiB Mem :   2807.5 total,   2056.2 free,    444.3 used,    307.0 buff/cache
MiB Swap:   2092.0 total,   2092.0 free,      0.0 used.   2197.9 avail Mem 

    PID USER      PR  NI    VIRT    RES    SHR S  %CPU  %MEM     TIME+ COMMAND                                          P 
  41416 nginx     20   0  111724   6260   4660 S   0.0   0.2   0:00.00 nginx                                            1 
  41417 nginx     20   0  111724   5884   4536 S   0.0   0.2   0:00.00 nginx                                            2 
  75633 root      20   0       0      0      0 I   0.0   0.0   0:00.10 kworker/2:3-events                               2 
  81214 root      20   0       0      0      0 I   0.0   0.0   0:00.02 kworker/3:2-xfs-cil/dm-0                         3 
  84670 root      20   0       0      0      0 I   0.0   0.0   0:00.14 kworker/1:2-events_power_efficient               1 
  95367 root      20   0       0      0      0 I   0.0   0.0   0:00.09 kworker/u256:1-events_unbound                    2 
 111598 root      20   0       0      0      0 I   0.0   0.0   0:00.02 kworker/3:1-xfs-cil/dm-0                         3 
 113156 root      20   0       0      0      0 I   0.0   0.0   0:00.37 kworker/1:0-events_power_efficient               1 
 142043 root      20   0       0      0      0 I   0.0   0.0   0:00.01 kworker/3:0-events                               3 
 143159 root      20   0       0      0      0 I   0.0   0.0   0:00.19 kworker/1:1-events                               1 
 152990 root      20   0   61736   4584   3672 R   0.0   0.2   0:00.07 top                                              3 
 158998 root      20   0   15128   3276   2940 S   0.0   0.1   0:00.00 bash                                             0 
 158999 root      20   0   15128   3300   2968 S   0.0   0.1   0:00.00 bash                                             3 
 159000 root      20   0   15128   3320   2992 S   0.0   0.1   0:00.00 bash                                             0

worker_priority number; //指明worker进程的nice值

就是程序执行的优先级值越小执行就先执行

[root@serevr1 ~]# head -10 /usr/local/nginx/conf/nginx.conf

user  nginx nginx;
worker_processes  3;

worker_rlimit_nofile 10240;
worker_cpu_affinity 0001 0010 0100;
worker_priority -20;  

[root@serevr1 ~]# ps -elf  | grep nginx
1 S root      191471       1  0  80   0 - 20064 -      21:28 ?        00:00:00 nginx: master process nginx
5 S nginx     191472  191471  0  60 -20 - 27931 do_epo 21:28 ?        00:00:00 nginx: worker process
5 S nginx     191473  191471  0  60 -20 - 27931 do_epo 21:28 ?        00:00:00 nginx: worker process
5 S nginx     191474  191471  0  60 -20 - 27931 do_epo 21:28 ?        00:00:00 nginx: worker process
0 S root      199092    6690  0  80   0 -  2301 -      21:29 pts/2    00:00:00 grep --color=auto nginx

事件相关的配置：event{}段中的配置参数

accept_mutex {off|on};    //master调度用户请求至各worker进程时使用的负载均衡锁；on表示能让多个worker轮流地、序列化地去响应新请求
lock_file file;    //accept_mutex用到的互斥锁锁文件路径
use [epoll | rtsig | select | poll];    //指明使用的事件模型，建议让nginx自行选择
worker_connections #;    //每个进程能够接受的最大连接数

worker_processes 的值乘以worker_connections 的值（3*20480/2）

user  nginx nginx;
worker_processes  3;

worker_rlimit_nofile 10240;
worker_cpu_affinity 0001 0010 0100;
worker_priority -20;



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

pid        logs/nginx.pid;


events {
    worker_connections  20480;
}

测试

[root@serevr1 ~]# yum -y install httpd-tools
[root@serevr1 ~]# ab  -n 30000 http://192.168.244.133/index.html
This is ApacheBench, Version 2.3 <$Revision: 1843412 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking 192.168.244.133 (be patient)
Completed 3000 requests
Completed 6000 requests
Completed 9000 requests
Completed 12000 requests
Completed 15000 requests
Completed 18000 requests
Completed 21000 requests
Completed 24000 requests
Completed 27000 requests
Completed 30000 requests
Finished 30000 requests


Server Software:        nginx/1.20.1
Server Hostname:        192.168.244.133
Server Port:            80

Document Path:          /index.html
Document Length:        612 bytes

Concurrency Level:      1
Time taken for tests:   3.229 seconds
Complete requests:      30000
Failed requests:        0
Total transferred:      25350000 bytes
HTML transferred:       18360000 bytes
Requests per second:    9290.96 [#/sec] (mean)
Time per request:       0.108 [ms] (mean)
Time per request:       0.108 [ms] (mean, across all concurrent requests)
Transfer rate:          7666.86 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    0   0.0      0       1
Processing:     0    0   0.1      0       2
Waiting:        0    0   0.1      0       2
Total:          0    0   0.1      0       2

Percentage of the requests served within a certain time (ms)
  50%      0
  66%      0
  75%      0
  80%      0
  90%      0
  95%      0
  98%      0
  99%      1
 100%      2 (longest request)

网络连接相关的配置参数

keepalive_timeout number;    //长连接的超时时长，默认为65s
keepalive_requests number;    //在一个长连接上所能够允许请求的最大资源数
keepalive_disable [msie6|safari|none];    //为指定类型的UserAgent禁用长连接
tcp_nodelay on|off;    //是否对长连接使用TCP_NODELAY选项，为了提升用户体验，通常设为on
client_header_timeout number;    //读取http请求报文首部的超时时长
client_body_timeout number;    //读取http请求报文body部分的超时时长
send_timeout number;    //发送响应报文的超时时长

fastcgi的相关配置参数

LNMP：php要启用fpm模型
配置示例如下：

location ~ \.php$ {
  root html;
  fastcgi_pass 127.0.0.1:9000;      //定义反向代理
  fastcgi_index index.php;
  fastcgi_param SCRIPT_FILENAME /scripts$fastcgi_script_name;
  include fastcgi_params;
}

常需要进行调整的参数

worker_processes
worker_connections
worker_cpu_affinity
worker_priority

nginx作为web服务器时使用的配置：http{}段的配置参数

http{…}：配置http相关，由ngx_http_core_module模块引入。nginx的HTTP配置主要包括四个区块，结构如下：

http {//协议级别
  include mime.types;
  default_type application/octet-stream;
  keepalive_timeout 65;
  gzip on;
  upstream {//负载均衡配置
    ...
  }
  server {//服务器级别，每个server类似于httpd中的一个<VirtualHost>
    listen 80;
    server_name localhost;
    location / {//请求级别，类似于httpd中的<Location>，用于定义URL与本地文件系统的映射关系
      root html;
      index index.html index.htm;
    }
  }
}

http{}段配置指令：
server {}：定义一个虚拟主机，示例如下：

server {
  listen 80;
  server_name www.idfsoft.com;
  root "/vhosts/web";
}

编写一个

    ......
    ......
    #gzip  on;
    server {
        listen 82;
        server_name  www.yyds.com;

        location / {
            root html/test;
            index index.html;
        }
    }
    server {
        listen       80;
        server_name  localhost;

        #charset koi8-r;

        #access_log  logs/host.access.log  main;

在指定位置写一个index.html文件

[root@serevr1 ~]# cd  /usr/local/nginx/
[root@serevr1 nginx]# ls
client_body_temp  html        sbin
conf              logs        scgi_temp
fastcgi_temp      proxy_temp  uwsgi_temp
[root@serevr1 nginx]# cd  html/
[root@serevr1 html]# ls
50x.html  index.html
[root@serevr1 html]# mkdir test
[root@serevr1 html]# cd  test/
[root@serevr1 test]# echo "paqiu" > index.html
[root@serevr1 test]# ls
index.html

重启nginx服务

[root@serevr1 test]# nginx -s stop;nginx
[root@serevr1 test]# ss -antl
State    Recv-Q   Send-Q       Local Address:Port                     Peer Address:Port                 
LISTEN   0        128                0.0.0.0:80                            0.0.0.0:*                    
LISTEN   0        128                0.0.0.0:82                            0.0.0.0:*                    
LISTEN   0        128                0.0.0.0:22                            0.0.0.0:*                    
LISTEN   0        80                       *:3306                                *:*                    
LISTEN   0        128                   [::]:22                               [::]:*                    
[root@serevr1 test]# 
[root@serevr1 test]# curl 192.168.244.133:82
paqiu