解决nginx 503 Service Temporarily Unavailable方法示例

#user nobody;
worker_processes 1;
#worker_rlimit_nofile 100000; 
#error_log logs/error.log;
#error_log logs/error.log notice;
#error_log logs/error.log info;
 
#pid    logs/nginx.pid;
 
events {
  worker_connections 1024;
}
 
http {
  include    mime.types;
  default_type application/octet-stream;
 
##cache##
 proxy_connect_timeout 5;
 proxy_read_timeout 60;
 proxy_send_timeout 5;
 proxy_buffer_size 16k;
 proxy_buffers 4 64k;
 proxy_busy_buffers_size 128k;
 proxy_temp_file_write_size 128k;
 proxy_temp_path /home/temp_dir;
 proxy_cache_path /usr/local/nginx/cache levels=1:2 keys_zone=cache_one:200m inactive=1d max_size=30g;
 ##end##
#limit per ip per second access times 10 
limit_req_zone $binary_remote_addr zone=allips:20m rate=20r/s;
 
  #log_format main '$remote_addr - $remote_user [$time_local] "$request" '
  #         '$status $body_bytes_sent "$http_referer" '
  #         '"$http_user_age