nginx负载均衡的配置

nginx_lb.conf

user  nginx;
worker_processes  auto;

error_log  /var/log/nginx/error.log warn;
pid        /var/run/nginx.pid;


events {
    worker_connections  1024;
}


http {
    include       /etc/nginx/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"';

	log_format upstreamlog '$remote_addr - $http_x_forwarded_for - $remote_user [$time_local] '
                  ' $status $body_bytes_sent "$http_referer" "$http_user_agent"  ' 
                  ' "$request" : $request_time sec '
                  ' "$upstream_addr" : $upstream_response_time sec';

    access_log  /var/log/nginx/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    keepalive_timeout  65;

    #gzip  on;

    include /etc/nginx/conf.d/*.conf;

    # load balance backend servers
    upstream backend {
        least_conn;
        server **.**.**.**:8080;
        server **.**.**.**:8080;
    }

    # shicha app server
    server {
        listen       80;
        server_name  api.shichaapp.com;

        access_log   /opt/logs/nginx/timediff.access.log  upstreamlog;
		error_log 	/opt/logs/nginx/timediff.error.log warn;
        root         html;

        location / {
            proxy_pass http://backend;
			# when server returns http 502, redirect to another server
			proxy_next_upstream error timeout http_502;	
            proxy_set_header  X-Real-IP  $remote_addr;
			proxy_set_header  X-Forwarded-For $proxy_add_x_forwarded_for;
        }
    }

}