步骤：

1 编译nginx,加上参数 --with-http_stub_status_module

以我自己的编译选项为例：

配置指令

./configure --prefix=/usr/local
--user=nginx
--group=nginx
--with-http_ssl_module
--with-http_realip_module
--http-client-body-temp-path=/usr/local/var/tmp/nginx/client
--http-proxy-temp-path=/usr/local/var/tmp/nginx/proxy
--http-fastcgi-temp-path=/usr/local/var/tmp/nginx/fcgi
--http-scgi-temp-path=/usr/local/var/tmp/nginx/scgi
--http-uwsgi-temp-path=/usr/local/var/tmp/nginx/uwsgi
--with-http_geoip_module
--with-http_stub_status_module
2 修改nginx配置文件，添加监控状态配置

在nginx.conf的server块中添加如下代码

location /nginx_status {
# Turn on nginx stats
stub_status on;
# I do not need logs for stats
access_log off;
# Security: Only allow access from 192.168.1.100 IP #
#allow 192.168.1.100;
# Send rest of the world to /dev/null #
#deny all;
}
这段代码是加在默认的server里的，
假设默认server的配置为

listen 127.0.0.1:80;
server_name 127.0.0.1;
那么访问nginx的状态，就可以通过 curl 127.0.0.1/nginx_status访问了

返回结果类似于：

Active connections: 1
server accepts handled requests
655 655 1985
Reading: 0 Writing: 1 Waiting: 0