Nginx配置代理

nginx安装在上一篇博文。https://www.cnblogs.com/AganRun/p/12951618.html

演示如何用nginx分发前端请求和后端请求。

部署前端

1. 首先，随便找个前端模板，放到服务器的目录下。我这里放到了nginx安装目录下的html文件夹

[root@learn200 html]# pwd
/usr/local/nginx/html
[root@learn200 html]# ll
total 56
-rw-r--r--. 1 root root   537 May 24 16:45 50x.html
-rw-r--r--. 1 root root  6620 May 24 17:57 about.html
-rw-r--r--. 1 root root 12575 May 24 17:57 blog.html
-rw-r--r--. 1 root root  5791 May 24 17:57 contact.html
drwxr-xr-x. 2 root root   104 May 24 17:57 css
drwxr-xr-x. 4 root root    38 May 24 17:57 fonts
drwxr-xr-x. 2 root root   183 May 24 17:57 images
-rw-r--r--. 1 root root 11012 May 24 17:57 index.html
drwxr-xr-x. 2 root root   230 May 24 17:57 js
-rw-r--r--. 1 root root  7608 May 24 17:57 portfolio.html

2. 打开浏览器，访问本地80端口,发现首页可以被正常访问

部署后端

1. 简单写两个flask Demo

from flask import Flask

server=Flask(__name__)

@server.route('/api/test')
def test():
    return "Hello AganRun 8081"

server.run(port=8081, host='0.0.0.0')

同样复制了一个Demo，端口起在了8082,为了访问区分访问，我返回了8082

2. 启动服务

[root@learn200 python]# python3 demo1.py 
 * Serving Flask app "demo1" (lazy loading)
 * Environment: production
   WARNING: This is a development server. Do not use it in a production deployment.
   Use a production WSGI server instead.
 * Debug mode: off
 * Running on http://0.0.0.0:8081/ (Press CTRL+C to quit)

访问

[root@learn200 python]# curl localhost:8081/api/test
Hello AganRun 8081


[root@learn200 python]# curl localhost:8082/api/test
Hello AganRun 8082

NGINX代理

上面的后端访问是直接通过端口访问的，现在由nginx代理请求，
把80端口上的/api开头的请求，负载均衡的代理到flask项目。

1. 编辑nginx.conf,设置为如下内容。重点关注upstream

user nobody nobody;
worker_processes 1; #设置值和CPU核心数一致
error_log /usr/local/nginx/logs/nginx_error.log crit; #日志位置和日志级别
pid /usr/local/nginx/logs/nginx.pid;
#Specifies the value for maximum file descriptors that can be opened by this process.
worker_rlimit_nofile 65535;
events
{
  use epoll;
  worker_connections 65535;
}
http
{
  include mime.types;
  default_type application/octet-stream;
  log_format main  '$remote_addr - $remote_user [$time_local] "$request" '
               '$status $body_bytes_sent "$http_referer" '
               '"$http_user_agent" $http_x_forwarded_for';
  
  #charset gb2312;
     
  server_names_hash_bucket_size 128;
  client_header_buffer_size 32k;
  large_client_header_buffers 4 32k;
  client_max_body_size 8m;
  
  sendfile on;
  tcp_nopush on;
  keepalive_timeout 60;
  tcp_nodelay on;
  fastcgi_connect_timeout 300;
  fastcgi_send_timeout 300;
  fastcgi_read_timeout 300;
  fastcgi_buffer_size 64k;
  fastcgi_buffers 4 64k;
  fastcgi_busy_buffers_size 128k;
  fastcgi_temp_file_write_size 128k;
  gzip on;      #开启压缩
  gzip_min_length 1k;
  gzip_buffers 4 16k;
  gzip_http_version 1.0;
  gzip_comp_level 2;
  gzip_types text/plain application/x-javascript text/css application/xml;
  gzip_vary on;
 
  upstream mysvr {   # flask项目地址
    server 127.0.0.1:8081;
    server 127.0.0.1:8082;
  }
  #limit_zone crawler $binary_remote_addr 10m;
  #下面是server虚拟主机的配置
  server
  {
    listen 80;#监听端口
    server_name localhost;#域名
    location / {
      root /usr/local/nginx/html;
      index index.html index.htm;
    }
    location ~ .*.(gif|jpg|jpeg|png|bmp|swf|ico)$  #静态资源
    {
      root /usr/local/nginx/html;
      expires 30d;
    }
    location ~ .*.(js|css|html)$   #前端文件
    {
      root /usr/local/nginx/html;
      expires 15d;
    }
    location ~ /api/            # 后端请求
    {
      proxy_pass http://mysvr;
      proxy_redirect default;
      proxy_connect_timeout 3;
      proxy_send_timeout 30;
      proxy_read_timeout 30;			
      proxy_set_header X-Forwarded-Host $host;
      proxy_set_header X-Forwarded-Server $host;
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; 
      client_max_body_size 100m;
    }
    access_log logs/access.log;
  }

}

2. 重启

检验配置无误后重启nginx

[root@learn200 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@learn200 conf]# nginx -s reload

3. 请求

可以看到，请求以及被代理，并分发到不同的节点

[root@learn200 conf]# curl localhost/api/test
Hello AganRun 8081[root@learn200 conf]# curl localhost/api/test
Hello AganRun 8082[root@learn200 conf]# curl localhost/api/test
Hello AganRun 8081[root@learn200 conf]# curl localhost/api/test
Hello AganRun 8082[root@learn200 conf]#