Nginx负载均衡配置

场景描述

单机缺点

当量上来后由于单机请求压力大，存在单点故障等问题

负载优点

降低单点故障

提高服务器处理能力

灵活控制请求流量

隐藏真实服务器地址

负载均衡

Nginx配置

#user  nobody;
worker_processes  8;
worker_rlimit_nofile 65535;

events {
use epoll;
worker_connections  8192;
}

#http核心
http {
include       mime.types;
default_type  application/octet-stream;
client_max_body_size 10M;
client_body_buffer_size 256k;

#日志格式
log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
'"$status" $body_bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for" '
'"$gzip_ratio" $request_time $bytes_sent $request_length';

access_log  logs/access.log  main;
sendfile        on;
keepalive_timeout  65;

upstream backend{
server 192.168.1.1 weight=1;
server 192.168.1.1 weight=1;
}

#虚拟服务器
server {
listen       80;
server_name  www.go008.com;

location / {
root   html;
index  index.html index.htm;
proxy_pass http://backend; proxy_redirect off;
proxy_set_header Host $http_host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Cookie $http_cookie;
chunked_transfer_encoding off;
proxy_pass_header Set-Cookie;
}

#error_page  404              /404.html;

error_page   500 502 503 504  /50x.html;
location = /50x.html {
root   html;
}
}
}

白话描述

当用户请求www.go008.com的时候，由于该域名IP地址解析到负载均衡nginx所在服务器

由于虚拟服务器server配置了监听www.go008.com:80

请求被分发到proxy_pass配置的反向代理模块backend

upstream根据配置将请求分发到后端真实服务器