nginx负载均衡搭建及测试

#user  nobody;  # user  root root #Nginx所在的用户和用户组
user  root root; #Nginx所在的用户和用户组
worker_processes  1;# 启动的工作进程数量
#错误日志存放路径  
#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;
error_log  logs/error.log  info;  #add by olddoor-----------
#pid        logs/nginx.pid;
#add by olddoor-----------
#add end------------------
events {
    worker_connections  1024;
}
http {
    include       mime.types;
    default_type  application/octet-stream;
    #定义日志格式  
    #log_format  main  ‘$remote_addr - $remote_user [$time_local] "$request" ‘
    #                  ‘$status $body_bytes_sent "$http_referer" ‘
    #                  ‘"$http_user_agent" "$http_x_forwarded_for"‘;
    #access_log  logs/access.log  main;
    sendfile        on;
    #tcp_nopush     on;
    #keepalive_timeout  0;
    keepalive_timeout  65;
    #gzip  on;
	#add by olddor---------------------
	upstream localhost { 
	#发到localhost上的请求，通过Nginx转发到实际处理请求的服务器
           server 192.168.64.132:8080 weight=1;
           server 192.168.64.132:8081 weight=1;
		   server 192.168.64.132:8082 weight=1;
    }
	#add by olddor over----------------
    server {
        listen       80;
        server_name  localhost;
        #charset koi8-r;
        #access_log  logs/host.access.log  main;
        location / {
			proxy_connect_timeout   3; #add by olddoor  
			proxy_send_timeout      30; #add by olddoor 
			proxy_read_timeout      30; #add by olddoor 
            proxy_pass http://localhost;  #add by olddoor
            #root   html; #ignore by olddoor 	
            #index  index.html index.htm; #ignore by olddoor 	
        }
		location  /test/jpgs/ {
            alias /data/imgs/;
        }		
		
		#location /jpgs
		
        #error_page  404              /404.html;
        # redirect server error pages to the static page /50x.html
        #
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }
        # deny access to .htaccess files, if Apache‘s document root
        # concurs with nginx‘s one
        #
        #location ~ /\.ht {
        #    deny  all;
        #}
    }
    # another virtual host using mix of IP-, name-, and port-based configuration
    #
    #server {
    #    listen       8000;
    #    listen       somename:8080;
    #    server_name  somename  alias  another.alias;
    #    location / {
    #        root   html;
    #        index  index.html index.htm;
    #    }
    #}
    # HTTPS server
    #
    #server {
    #    listen       443;
    #    server_name  localhost;
    #    ssl                  on;
    #    ssl_certificate      cert.pem;
    #    ssl_certificate_key  cert.key;
    #    ssl_session_timeout  5m;
    #    ssl_protocols  SSLv2 SSLv3 TLSv1;
    #    ssl_ciphers  HIGH:!aNULL:!MD5;
    #    ssl_prefer_server_ciphers   on;
    #    location / {
    #        root   html;
    #        index  index.html index.htm;
    #    }
    #}
}

apt-get install apache2-utils

#用于描述每个请求处理时间的分布情况，例如：50% 28 50%请求处理时间不超过28毫秒 （这里所指的处理时间是指：Time per request ）
Percentage of the requests served within a certain time (ms)
  50%     28
  66%     32
  75%     34
  80%     35
  90%     53
  95%     62
  98%     65
  99%     66
 100%   1823 (longest request)
second表示当前测试的服务器每秒可以处理16.54个静态html的请求事务，后面的mean表示平均。这个数值表示当前机器的整体性能，值越大越好。
Requests per second:    547.04 [#/sec] (mean)
Time per request:       1828.016 [ms] (mean)
Time per request:       1.828 [ms] (mean, across all concurrent requests)
Transfer rate:          76.93 [Kbytes/sec] received

This is ApacheBench, Version 2.3 <$Revision: 1528965 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/
Benchmarking localhost (be patient)
Total of 9967 requests completed

Server Software:        nginx/1.4.2
Server Hostname:        localhost
Server Port:            80
Concurrency Level:      1000
Time taken for tests:   1.145 seconds
Complete requests:      1000
Failed requests:        551
   (Connect: 0, Receive: 0, Length: 551, Exceptions: 0)
Non-2xx responses:      1000
Keep-Alive requests:    0
Total transferred:      254220 bytes
HTML transferred:       105792 bytes
second表示当前测试的服务器每秒可以处理16.54个静态html的请求事务，后面的mean表示平均。这个数值表示当前机器的整体性能，值越大越好。
Requests per second:    873.38 [#/sec] (mean)
Time per request:       1144.983 [ms] (mean)
Time per request:       1.145 [ms] (mean, across all concurrent requests)
Transfer rate:          216.83 [Kbytes/sec] received
Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:       16   26   4.6     27      33
Processing:    16  155 174.5     88    1101
Waiting:       13  155 174.6     88    1101
Total:         44  181 172.5    107    1118
Percentage of the requests served within a certain time (ms)
  50%    107
  66%    201
  75%    243
  80%    257
  90%    334
  95%    360
  98%   1116
  99%   1117
 100%   1118 (longest request)

ab -kc 1000 -n 1000 http://192.168.64.132:80/test/ |tee /usr/111.txt  #将结果保存到/usr/111.txt中