Nginx core configuration files and common commands

1 Core configuration

Setting the user of the worker process refers to the user in linux, which involves some permissions for nginx to manipulate directories or files. The default is nobody
```
user root;
```
Set the number of worker processes. Generally speaking, if there are a few CPUs, just set a few, or set it to N-1.
```
worker_processes 1;
```
nginx log level debug | info | notice | warn | error | crit | alert | emerg , the error level increases from left to right
Set nginx process pid
```
pid logs/nginx.pid;
```

Set working mode

events {
	# 默认使用epoll
	use epoll;
	# 每个worker允许连接的客户端最大连接数
	worker_connections 10240;
}

http is a command block, some command configuration for http network transmission
```
http {
}
```
include introduces external configuration to improve readability and avoid too large a single configuration file
```
include mime.types;
```

Set the log format, maina format defined name, so access_logyou can directly use the variables

parameter name	Parameter meaning
$remote_addr	Client ip
$remote_user	Remote client user name, generally:'-'
$time_local	Time and time zone
$request	Requested url and method
$status	Response status code
$body_bytes_send	Response client content bytes
$http_referer	Record which link the user jumped from
$http_user_agent	The proxy used by the user usually comes from a browser
$http_x_forwarded_for	Record the client's ip through the proxy server

sendfileUse efficient file transfer to improve transfer performance. It can be used only after it tcp_nopushis enabled , which means that the data table is sent only after it has accumulated a certain size, which improves the efficiency.
```
sendfile on;
tcp_nopush on;
```
keepalive_timeout sets the timeout time between client and server requests to ensure that new connections will not be repeatedly established when the client requests multiple times, saving resource consumption.
```
#keepalive_timeout 0;
keepalive_timeout 65;
```

2 Common commands

2.1 Stop

1 Stop violence ( 不推荐)

[root@localhost ~]# /usr/local/nginx/sbin
[root@localhost sbin]# ./nginx -s stop

2 Wait for the request to end, and then close (only for http 推荐)

[root@localhost sbin]# ./nginx -s quit

2.2 Verify configuration file

[root@localhost sbin]# ./nginx -t

2.3 View version number and specific information

[root@localhost sbin]# ./nginx -v
nginx version: nginx/1.16.1

[root@localhost sbin]# ./nginx -V
nginx version: nginx/1.16.1
built by gcc 4.8.5 20150623 (Red Hat 4.8.5-44) (GCC) 
configure arguments: --prefix=/usr/local/nginx --conf-path=/usr/local/nginx/conf/nginx.conf --pid-path=/var/run/nginx/nginx.pid --lock-path=/var/lock/nginx.lock --error-log-path=/var/log/nginx/error.log --http-log-path=/var/log/nginx/access.log --with-http_gzip_static_module --http-client-body-temp-path=/var/temp/nginx/client --http-proxy-temp-path=/var/temp/nginx/proxy --http-fastcgi-temp-path=/var/temp/nginx/fastcgi --http-uwsgi-temp-path=/var/temp/nginx/uwsgi --http-scgi-temp-path=/var/temp/nginx/scgi

2.4 Prompt command

[root@localhost sbin]# ./nginx -h
nginx version: nginx/1.16.1
Usage: nginx [-?hvVtTq] [-s signal] [-c filename] [-p prefix] [-g directives]

Options:
  -?,-h         : this help
  -v            : show version and exit
  -V            : show version and configure options then exit
  -t            : test configuration and exit
  -T            : test configuration, dump it and exit
  -q            : suppress non-error messages during configuration testing
  -s signal     : send signal to a master process: stop, quit, reopen, reload
  -p prefix     : set prefix path (default: /usr/local/nginx/)
  -c filename   : set configuration file (default: /usr/local/nginx/conf/nginx.conf)
  -g directives : set global directives out of configuration file

2.5 Reload the configuration file

[root@localhost sbin]# ./nginx -s reload

2.5 Specify the core configuration file

[root@localhost sbin]# ./nginx -c test.conf

3 Related information

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