Nginx serves as a static resource web service and performs static resource compression

This article introduces to you about Nginx as a static resource web service and static resource compression. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

1. Static resource web service

##1. Static resource type

2. Static resource service scenario-CDN

## 2. Static resource core configuration

1. File reading sendfile

Sendfile is set to on to indicate efficient startup The mode for transferring files. sendfile allows Nginx to transfer data directly between disk and tcp socket when transferring files. If this parameter is not enabled, it will first apply for a buffer in the user space (Nginx process space), use the read function to read the data from the disk to the cache, then read the buffer in the user space from the cache, and then use the write function to read the data from the user space. The space buffer is written to the kernel buffer and finally to the tcp socket. After turning on this parameter, the data does not need to go through the user buffer.

#Grammar

Syntax:        sendfile on | off;
Default:    sendfile off;
Context:    http, server, location, if in location

improves the transmission efficiency of network data packets when sendfile is turned on.

That is to say, when tcp_nopush=on, the result is that the data packet will not be transmitted immediately. When the data packet is the largest, it will be transmitted at once. This will help solve the network congestion, although there is a slight delay.

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

Under the keepalive connection, improve the real-time transmission of network data packets.

Syntax:        tcp_nodelay on | off;
Default:    tcp_nodelay off;
Context:    server, location

Turning on compression can speed up resource response and save network bandwidth resources.

##ngx_http_gzip_module

Syntax

Turn compression on and off

Syntax:        gzip on | off;
Default:    gzip off;
Context:    http, server, location, if in location

Syntax:    gzip_comp_level level;
Default:    gzip_comp_level 1;
Context:    http, server, location

Syntax:    gzip_http_version 1.0 | 1.1;
Default:    gzip_http_version 1.1;
Context:    http, server, location

Compression extension module

Pre-read gzip function ngx_http_gzip_static_module

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

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

Syntax:    gunzip_buffers number size;
Default:    gunzip_buffers 32 4k|16 8k;
Context:    http, server, location

1. vim /etc/nginx/conf.d/static.conf

server {
    #开启sendfile，提高网络包的传输效率
    sendfile on;

    #配置txt|xml资源的路径
    location ~ .*\.(txt|xml)$ {
        #开启压缩
        gzip on;
        gzip_http_version 1.1;
        gzip_comp_level 1;
        gzip_types text/plain application/xml;
        root /vagrant/doc;
    }
}

3. Create the /vagrant/doc/a.txt file and check the file size

[root/etc/nginx]# curl http://www.sina.com.cn/ > /vagrant/doc/a.txt
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  557k  100  557k    0     0   488k      0  0:00:01  0:00:01 --:--:--  488k

[root/etc/nginx]# ll /vagrant/doc/a.txt
-rwxrwxrwx 1 vagrant vagrant 558K 7月  11 10:57 /vagrant/doc/a.txt*

4. Access 192.168.33.88/a.txt through curl and check the http response header information

[root/etc/nginx]# curl -I 192.168.33.88/a.txt -H Accept-Encoding:gzip,defalte
HTTP/1.1 200 OK
Server: nginx/1.14.0
Date: Wed, 11 Jul 2018 11:01:43 GMT
Content-Type: text/plain
Last-Modified: Wed, 11 Jul 2018 10:57:22 GMT
Connection: keep-alive
ETag: W/"5b45e292-8b47f"
Content-Encoding: gzip

5. Access 192.168.33.88/a.txt through a browser and use developer tools to check the size of the requested file

It can be seen that after gzip compression, the requested file is compressed from 558K to 148K, and the compression ratio is very high.

6. In addition, you can also check the size of the transferred file through the nginx access.log log

[root/etc/nginx]# tail /var/log/nginx/access.log
192.168.33.1 - - [11/Jul/2018:11:02:46 +0000] "GET /a.txt HTTP/1.1" 200 151549 "-" "Chrome/67.0.3396.99" "-"

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