nginx的负载均衡主要是以下配置起作用

#负载均衡 upstream load_banance { #负载均衡方法,可选

,ip_hash等，不填写则为轮询方式; # 服务器的访问地址,最好使用服务器的私有IP以获得更好的性能和安全性。 server 172.163.32.125:8090 weight=1; server 172.163.32.165:8090 weight=1; }

以上配置表示当请求nginx时，会按照轮询的方式去172.163.32.125:8090和172.163.32.165:8090请求服务

以下是一个完整的nginx配置示例：

#user  nobody;
worker_processes  1;

#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

#pid        logs/nginx.pid;


events {
    worker_connections  1024;
}


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"';

    #access_log  logs/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    #keepalive_timeout  0;
    keepalive_timeout  65;

    #gzip  on;
#负载均衡
upstream load_banance {
     #负载均衡方法,可选:least_conn,ip_hash等，不填写则为轮询方式;
     # 服务器的访问地址,最好使用服务器的私有IP以获得更好的性能和安全性。
     server 172.163.32.125:8090 weight=1;
     server 172.163.32.165:8090 weight=1;
}

server {
                listen 80;
                charset utf-8;
                root /home/allen/mnt/cpc/dist;
     location = /index.html {
        add_header Cache-Control "no-cache, no-store";
     }
                location / {
                        try_files $uri $uri/ @router;
                        index  index.html index.htm;
                }
                location @router {
                        rewrite ^.*$ /index.html last;
                }
                        location /api {
                proxy_set_header Host $http_host;
                proxy_set_header X-Real-IP $remote_addr;
                proxy_set_header REMOTE-HOST $remote_addr;
                proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
                proxy_http_version 1.1;
                        proxy_set_header Connection "";
                proxy_pass http://load_banance;
                rewrite "^/api/(.*)$" /$1 break;
        }
                client_max_body_size 10M;
}
    # another virtual host using mix of IP-, name-, and port-based configuration
    #
    #server {
    #    listen       8000;
    #    listen       somename:8080;
    #    server_name  somename  alias  another.alias;

    #    location / {
    #        root   html;
    #        index  index.html index.htm;
    #    }
    #}


    # HTTPS server
    #
    #server {
    #    listen       443 ssl;
    #    server_name  localhost;

    #    ssl_certificate      cert.pem;
    #    ssl_certificate_key  cert.key;

    #    ssl_session_cache    shared:SSL:1m;
    #    ssl_session_timeout  5m;

    #    ssl_ciphers  HIGH:!aNULL:!MD5;
    #    ssl_prefer_server_ciphers  on;

    #    location / {
    #        root   html;
    #        index  index.html index.htm;
    #    }
    #}

}