nginx四层、七层负载均衡配置示例

所谓四层就是基于IP+端口的负载均衡，通过虚拟IP+端口接收请求，然后再分配到真实的服务器；七层通过虚拟的URL或主机名接收请求，然后再分配到真实的服务器七层就是基于URL等应用层信息的负载均衡。

七层负载

# 定义
upstream phpserver {
        server192.168.2.3;
        server192.168.2.4;
        }
upstream htmlserver {
        server192.168.2.1;
        server192.168.2.2;
    }
# 引用
location / {
    root  /usr/share/nginx/html;
    index  index.html index.htm;
    if ($request_uri ~*\.html$){
        proxy_pass http://htmlserver;
    }
    if ($request_uri~* \.php$){
        proxy_pass http://phpserver;
    }
}

四层负载

stream {
    log_format  proxy '$remote_addr $remote_port - [$time_local] $status $protocol '
                  '"$upstream_addr" "$upstream_bytes_sent" "$upstream_connect_time"' ;
    access_log /var/log/nginx/proxy.log proxy;
    upstream lb {
            server 172.16.1.5:80 weight=5 max_fails=3 fail_timeout=30s;
            server 172.16.1.6:80 weight=5 max_fails=3 fail_timeout=30s;
    }

    server {
            listen 80;
            proxy_connect_timeout 3s;
            proxy_timeout 3s;
            proxy_pass lb;
    }
}