Linux 網路及系統檢測工具

Iptraf (網路流量測量工具)

Iperf (網路性能測量工具)

Iptstate (iptables 狀態 - 即時各 port 監控工具)

bandwidth (頻寬檢測軟體, web 管理)

tcpdump -i eth0 src host x.x.x.x dst host x.x.x.x port xx (tcp收集器)

vmstat -n 1 (監控系統狀態, 每秒監控)

檢查遠端網站是否正常運作

wget --no-cache --spider --connect-timeout=number(sec) --tries=(重試幾次) -q 網址

--no-cache : Disable server-side cache. 改為即時查詢

--spider : 不下載網站內容, 只單純做檢查.

apache 壓力測試

在 apache 本身的套件中, 有個叫 ab(ApacheBench) 的程式.
ApacheBench 主要是用來測試 apache 執行效率.

ab 參數:
Usage: /usr/sbin/ab [options] [http[s]://]hostname[:port]/path
Options are:
   -n requests     Number of requests to perform
  -c concurrency  Number of multiple requests to make
  -t timelimit    Seconds to max. wait for responses
  -p postfile     File containg data to POST
  -T content-type Content-type header for POSTing
  -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: zop'
                  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.
  -g filename     Output collected data to gnuplot format file.
  -e filename     Output CSV file with percentages served
  -s              Use httpS instead of HTTP (SSL)
  -h              Display usage information (this message)
ex: 要執行 1000 次的 connection, 20 次的 concurrent (並行, 同時).
語法: ab -n 1000 -c 20 http://localhost/abc.php
產生出來的結果. 主要要注意的是以下幾個.

Time taken for tests: 總共執行花了多久的時間.(以上 1000 次共多久)

Requests per second: 每秒平均可以處理多少個 connection.