使用ab命令对网站进行压力测试

apache自带的一个网站压力测试工具，是ApacheBench的缩写，我们可以使用这个工具来对我们的网站进行压力测试

安装

在ubuntu上要安装下面这个包

sudo apt-get install apache2-utils

在centos下是下面这个包

sudo yum install httpd-tools -y

使用

可以直接输入ab来看参数和使用方法

root@iZwz99byk2t6ki0rkih9nqZ:~# ab
ab: wrong number of arguments
Usage: ab [options] [http[s]://]hostname[:port]/path
Options are:
    -n requests     Number of requests to perform
    -c concurrency  Number of multiple requests to make at a time
    -t timelimit    Seconds to max. to spend on benchmarking
                    This implies -n 50000
    -s timeout      Seconds to max. wait for each response
                    Default is 30 seconds
    -b windowsize   Size of TCP send/receive buffer, in bytes
    -B address      Address to bind to when making outgoing connections
    -p postfile     File containing data to POST. Remember also to set -T
    -u putfile      File containing data to PUT. Remember also to set -T
    -T content-type Content-type header to use for POST/PUT data, eg.
                    'application/x-www-form-urlencoded'
                    Default is 'text/plain'
    -v verbosity    How much troubleshooting info to print
    -w              Print out results in HTML tables
    -i              Use HEAD instead of GET
    -x attributes   String to insert as table attributes
    -y attributes   String to insert as tr attributes
    -z attributes   String to insert as td or th attributes
    -C attribute    Add cookie, eg. 'Apache=1234'. (repeatable)
    -H attribute    Add Arbitrary header line, eg. 'Accept-Encoding: gzip'
                    Inserted after all normal header lines. (repeatable)
    -A attribute    Add Basic WWW Authentication, the attributes
                    are a colon separated username and password.
    -P attribute    Add Basic Proxy Authentication, the attributes
                    are a colon separated username and password.
    -X proxy:port   Proxyserver and port number to use
    -V              Print version number and exit
    -k              Use HTTP KeepAlive feature
    -d              Do not show percentiles served table.
    -S              Do not show confidence estimators and warnings.
    -q              Do not show progress when doing more than 150 requests
    -l              Accept variable document length (use this for dynamic pages)
    -g filename     Output collected data to gnuplot format file.
    -e filename     Output CSV file with percentages served
    -r              Don't exit on socket receive errors.
    -m method       Method name
    -h              Display usage information (this message)
    -Z ciphersuite  Specify SSL/TLS cipher suite (See openssl ciphers)
    -f protocol     Specify SSL/TLS protocol
                    (TLS1, TLS1.1, TLS1.2 or ALL)

介绍一个最常用的使用方法,意思是模仿10个用户对网站进行1000次请求

root@iZwz99byk2t6ki0rkih9nqZ:~# ab -c 10 -n 100 http://caiyuyuan.top/
This is ApacheBench, Version 2.3 <$Revision: 1706008 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking caiyuyuan.top (be patient).....done


Server Software:        GitHub.com
Server Hostname:        caiyuyuan.top
Server Port:            80

Document Path:          /
Document Length:        121813 bytes

Concurrency Level:      10
Time taken for tests:   20.921 seconds
Complete requests:      100
Failed requests:        0
Total transferred:      12241041 bytes
HTML transferred:       12181300 bytes
Requests per second:    4.78 [#/sec] (mean)
Time per request:       2092.142 [ms] (mean)
Time per request:       209.214 [ms] (mean, across all concurrent requests)
Transfer rate:          571.38 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:      105  212 364.8    112    2137
Processing:   444 1431 1694.7    693    8960
Waiting:      106  170 139.3    113     828
Total:        552 1643 1886.4    816   11097

Percentage of the requests served within a certain time (ms)
  50%    816
  66%   1156
  75%   1644
  80%   2260
  90%   4188
  95%   6710
  98%   7747
  99%  11097
 100%  11097 (longest request)

其实你最主要看的输出参数是下面这几个

• Server Software 服务器软件
• Server Hostname 主机名
• Server Port 服务器端口
• Time taken for tests 测试时间
• Complete requests完成的请求
• Failed requests 失败的请求
• Time per request 每次请求的时间
• Transfer rate 传输速度