nginx配置负载均衡 实现反向代理

1 nginx.conf（常用的配置如下）
#user nobody;
worker_processes 1;

#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;
#error_log  "pipe:rollback logs/error_log interval=1d baknum=7 maxsize=2G";

#pid        logs/nginx.pid;


events {
    worker_connections  1024;
}

# load modules compiled as Dynamic Shared Object (DSO)
#
#dso {
#    load ngx_http_fastcgi_module.so;
#    load ngx_http_rewrite_module.so;
#}

http {
    include       mime.types;
    default_type  application/octet-stream;
    sendfile        on;
    #tcp_nopush     on;
    keepalive_timeout  65;
    tcp_nopush     on;
    server_tokens off;
    tcp_nodelay on;
    server_names_hash_bucket_size 128;
    server_names_hash_max_size 512;
    client_header_timeout 15s;
    client_body_timeout 15s;

    gzip  on;
    gzip_min_length  16k;
    gzip_buffers 4 16k;
    gzip_comp_level 9;
    gzip_types  text/plain text/css application/x-javascript text/javascript application/javascript; 
    gzip_vary on;
    gzip_http_version 1.1;
    
    client_max_body_size 50m;
    client_header_buffer_size    128k;
    large_client_header_buffers  4 128k; 
    
    upstream tt.com{
    server 127.0.0.1:18080 weight=9 max_fails=2 fail_timeout=30s;
    }
    upstream cc.com{
    server 127.0.0.1:19000 weight=9 max_fails=2 fail_timeout=30s;
    }

    add_header X-XSS-Protection "1; mode=block";


    server {
        listen       80;
        server_name  www.baidu.com;
        #ssl on;
    	ssl_certificate /etc/ssl/1_www.yytaliance.com_bundle.crt;
   	ssl_certificate_key /etc/ssl/2_www.yytaliance.com.key;
	
	location  ~* \.(htm|html|js|css|png|jpg|gif|json|ico)$ {	  
           root /ercloud;
           expires 30d;
           charset utf-8;
        }

        location / {
            proxy_pass         http://tt.com;
            proxy_set_header   Host             $host;
            proxy_set_header   X-Real-IP        $remote_addr;
            proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;
            proxy_set_header   X-Forwarded-Scheme  $scheme;
	    proxy_buffer_size 4k;
            proxy_buffers 4 32k;
            proxy_busy_buffers_size 64k;
            proxy_temp_file_write_size 64k;
        }
    }

 server {
        listen       80;
        server_name 10.8.0.6;
        location  ~* \.(htm|html|js|css|png|jpg|gif|json|ico)$ {	  
           root /ercloud;
           expires 30d;
           charset utf-8;
        }

        location / {
            proxy_pass         http://tt.com;
            proxy_set_header   Host             $host;
            proxy_set_header   X-Real-IP        $remote_addr;
            proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;
            proxy_set_header   X-Forwarded-Scheme  $scheme;
	    proxy_buffer_size 4k;
            proxy_buffers 4 32k;
            proxy_busy_buffers_size 64k;
            proxy_temp_file_write_size 64k;
        }
    }



    server {
        listen       8080;
        server_name  127.0.0.1;

        location / {
            proxy_pass         http://127.0.0.1:8090;
            proxy_set_header   Host             $host;
            proxy_set_header   X-Real-IP        $remote_addr;
            proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;
            proxy_set_header   X-Forwarded-Scheme  $scheme;
	    proxy_buffer_size 4k;
            proxy_buffers 4 32k;
            proxy_busy_buffers_size 64k;
            proxy_temp_file_write_size 64k;
        }
    }
    server {
        listen       80;
        server_name  fu.com;
	#ssl on;
    	ssl_certificate /etc/ssl/1_fu.com_bundle.crt;
   	ssl_certificate_key /etc/ssl/2_fu.com.key;
	

        location / {
            proxy_pass         http://cc.com;
            proxy_set_header   Host             $host;
            proxy_set_header   X-Real-IP        $remote_addr;
            proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;
            proxy_set_header   X-Forwarded-Scheme  $scheme;
	    proxy_buffer_size 4k;
            proxy_buffers 4 32k;
            proxy_busy_buffers_size 64k;
            proxy_temp_file_write_size 64k;
        }
    }

}

2 实现反向代理

圈里面是 nginx监听的url 和端口 框里面就是nginx 反向代理之后 转发的 url(https://img-blog.csdnimg.cn/20190313152000239.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3N1blJlc3Q=,size_16,color_FFFFFF,t_70)

3.负载均衡
负载均衡需要配合 upstream模块 这里可以配置一些分配策略（权重,hash,访问量,自定义等(https://img-blog.csdnimg.cn/20190313152146886.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3N1blJlc3Q=,size_16,color_FFFFFF,t_70)

以上配置完成 即可完成反向代理 和负载均衡功能。