linux下 nginx监控问题

rpm -ivh http://nginx.org/packages/centos/6/noarch/RPMS/nginx-release-centos-6-0.el6.ngx.noarch.rpm

user nginx;
worker_processes 1;
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 liuhao  '$remote_addr^A$msec^A$http_host^A$request_uri';
  access_log /var/log/nginx/access.log main;
  sendfile    on;
  #tcp_nopush   on;
  keepalive_timeout 65;
  #gzip on;
 #  include /etc/nginx/conf.d/*.conf;
server {
  listen    80;
  server_name localhost;
  #access_log /var/log/nginx/host.access.log main;
location ~ .jpg {
    root  /data/www/web;
    index index.html index.htm;
 access_log /var/log/nginx/gp1918.log liuhao;
  }
  location ~ / {
    root  /usr/share/nginx/html;
    index index.html index.htm;
 access_log /var/log/nginx/access.log main;
  }
}
}

tail -f /var/log/nginx/access.log
tail -f /var/log/nigx/gp1918.log