This article mainly introduces the commonly used official modules of Nginx, which has certain reference value. Now I share it with everyone. Friends in need can refer to it

Nginx commonly used official modules

Nginx采用模块化的架构，Nginx中大部分功能都是通过模块方式提供的，比如HTTP模块、Mail模块等。

Nginx official module documentation

1. ngx_http_stub_status_module

Compilation options

--with-http_stub_status_module

Function

Provide Nginx Currently processing access to basic status information such as connections

Syntax

Syntax:        stub_status;
Default:    —
Context:    server, location

Usage

• In nginx Configuration under server in the configuration file

server {
    # 添加的配置
    location /nginx_status {
        stub_status;
    }
    
    ...其它代码省略...
}

• Reload the configuration file after modificationnginx -s reload

• Accesshttp:///nginx_status in the browser, the following content will be returned

Active connections: 3 
server accepts handled requests
 7 7 16 
Reading: 0 Writing: 1 Waiting: 2

Active connections: Nginx’s current number of active connections
accepts: The total number of client connections received
handled: The total number of client connections processed. Generally speaking, this parameter value is the same as accepts, unless some resource limit has been reached (such as worker_connections limit)
requests: The total number of client requests
Reading : The number of connections for which nginx is currently reading request headers
Writing: The number of connections for which nginx is currently writing responses
Reading: The number of idle clients currently waiting for requests Number of connections. It usually occurs when nginx turns on long connections (keep alive).

2. ngx_http_random_index_module

Compile options

--with-http_random_index_module

Function

Select a random number in the home directory File as homepage

Syntax

Syntax:        random_index on | off;
Default:    random_index off;
Context:    location

Usage

• Under server in nginx configuration file Configuration

server {
    location / {
        root /usr/share/nginx/html;
        #添加这一行开启随机主页模块
        random_index on;
        #把指定的主页注释掉
        #index index.html index.htm;
    }
    
    ...其它代码省略...
}

3. ngx_http_sub_module

Compilation options

--with-ngx_http_sub_module

Function

Modify the response by replacing a specified string

Syntax

Specify the replaced characters and replacement characters

Syntax:    sub_filter string replacement;
Default:   —
Context:    http, server, location

Last-Modified, use To verify whether the server content has changed, it is mainly used in caching scenarios

Syntax:       sub_filter_last_modified on | off;
Default:   sub_filter_last_modified off;
Context:    http, server, location

By default, only the first string found is replaced. If all matching strings in the text are replaced, it is set to off

Syntax:       sub_filter_once on | off;
Default:    sub_filter_once on;
Context:    http, server, location

In addition to "text/html", you can also replace strings with specified MIME types. The special value '*' matches any MIME type

Syntax:       sub_filter_types mime-type ...;
Default:    sub_filter_types text/html;
Context:    http, server, location

Usage

• Configure under server in the nginx configuration file

server {
    location / {
        root   /usr/share/nginx/html;
        index  index.html;
        # 将首页的nginx替换为home
        sub_filter 'nginx' 'home';
        # 不止替换第一个，而是替换response中所有的nginx
        sub_filter_once off;
    }
    
    ...其它代码省略...
}

• Reload the configuration file after modificationnginx -s reload

• curl localhost , return the following content, you will find that all nginx in the response has been replaced by home

[vagrant/etc/nginx]$ curl localhost







Welcome to home!
If you see this page, the home web server is successfully installed and
working. Further configuration is required.

For online documentation and support please refer to
home.org.

Commercial support is available at
home.com.

Thank you for using home.

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