nginx的upstream目前支持4种方式的分配

1、轮询（默认）

每个请求按时间顺序逐一分配到不同的后端服务器，如果后端服务器down掉，能自动剔除。

2、weight

指定轮询几率，weight和访问比率成正比，用于后端服务器性能不均的情况。

例如：

upstream?bakend?{

server?192.168.0.14?weight=10;

server?192.168.0.15?weight=10;

}

2、ip_hash

每个请求按访问ip的hash结果分配，这样每个访客固定访问一个后端服务器，可以解决session的问题。

例如：

upstream?bakend?{

ip_hash;

server?192.168.0.14:88;

server?192.168.0.15:80;

}

##配置虚拟机

server

{

listen?80;

配置监听端口

server_name?image.***.com;

配置访问域名

location?~*?\.(mp3|exe)$?{

对以“mp3或exe”结尾的地址进行负载均衡

proxy_pass?http://img_relay$request_uri;

设置被代理服务器的端口或套接字，以及URL

proxy_set_header?Host?$host;

proxy_set_header?X-Real-IP?$remote_addr;

proxy_set_header?X-Forwarded-For?$proxy_add_x_forwarded_for;

以上三行，目的是将代理服务器收到的用户的信息传到真实服务器上

}

location?/face?{

if?($http_user_agent?~*?"xnp")?{

rewrite?^(.*)$?http://211.151.188.190:8080/face.jpg?redirect;

}

proxy_pass?http://img_relay$request_uri;

proxy_set_header?Host?$host;

proxy_set_header?X-Real-IP?$remote_addr;

proxy_set_header?X-Forwarded-For?$proxy_add_x_forwarded_for;

error_page?404?502?=?@fetch;

}

location?@fetch?{

access_log?/data/logs/face.log?log404;

rewrite?^(.*)$?http://211.151.188.190:8080/face.jpg?redirect;

}

location?/image?{

if?($http_user_agent?~*?"xnp")?{

rewrite?^(.*)$?http://211.151.188.190:8080/face.jpg?redirect;

}

proxy_pass?http://img_relay$request_uri;

proxy_set_header?Host?$host;

proxy_set_header?X-Real-IP?$remote_addr;

proxy_set_header?X-Forwarded-For?$proxy_add_x_forwarded_for;

error_page?404?502?=?@fetch;

}

location?@fetch?{

access_log?/data/logs/image.log?log404;

rewrite?^(.*)$?http://211.151.188.190:8080/face.jpg?redirect;

}

}

##其他举例

server

{

listen?80;

server_name?*.***.com?*.***.cn;

location?~*?\.(mp3|exe)$?{

proxy_pass?http://img_relay$request_uri;

proxy_set_header?Host?$host;

proxy_set_header?X-Real-IP?$remote_addr;

proxy_set_header?X-Forwarded-For?$proxy_add_x_forwarded_for;

}

location?/?{

if?($http_user_agent?~*?"xnp")?{

rewrite?^(.*)$?http://i1.***img.com/help/noimg.gif?redirect;

}

proxy_pass?http://img_relay$request_uri;

proxy_set_header?Host?$host;

proxy_set_header?X-Real-IP?$remote_addr;

proxy_set_header?X-Forwarded-For?$proxy_add_x_forwarded_for;

#error_page?404?http://i1.***img.com/help/noimg.gif;

error_page?404?502?=?@fetch;

}

location?@fetch?{

access_log?/data/logs/baijiaqi.log?log404;

rewrite?^(.*)$?http://i1.***img.com/help/noimg.gif?redirect;

}

}

server

{

listen?80;

server_name?*.***img.com;

location?~*?\.(mp3|exe)$?{

proxy_pass?http://img_relay$request_uri;

proxy_set_header?Host?$host;

proxy_set_header?X-Real-IP?$remote_addr;

proxy_set_header?X-Forwarded-For?$proxy_add_x_forwarded_for;

}

location?/?{

if?($http_user_agent?~*?"xnp")?{

rewrite?^(.*)$?http://i1.***img.com/help/noimg.gif;

}

proxy_pass?http://img_relay$request_uri;

proxy_set_header?Host?$host;

proxy_set_header?X-Real-IP?$remote_addr;

proxy_set_header?X-Forwarded-For?$proxy_add_x_forwarded_for;

#error_page?404?http://i1.***img.com/help/noimg.gif;

error_page?404?=?@fetch;

}

#access_log?off;

location?@fetch?{

access_log?/data/logs/baijiaqi.log?log404;

rewrite?^(.*)$?http://i1.***img.com/help/noimg.gif?redirect;

}

}

server

{

listen?8080;

server_name?ngx-ha.***img.com;

location?/?{

stub_status?on;

access_log?off;

}

nginx的upstream目前支持4种方式的分配

原文：https://www.cnblogs.com/hanby/p/14362652.html