https://forum.andowson.com/posts/list/16.page JForum - http://www.jforum.net [code]#! /bin/sh
# Name: webmon.sh
# Author: Andowson Chang (andowson [at] gmail [dot] com)
# Version: 0.2
# Created: 2008-02-16
# Last Modified: 2008-02-17
# Description: Web connection monitor (health check)
# If target web server failed, then notify its owner.
# Here email is used for the simplest and cheapest way.
# Usage: webmon.sh <hostname> <owner email>
# Example:
# 1. Single owner:
# /root/admin/webmon.sh www.yourcompany.com you@yourcompany.com
# 2.Multiple onwer:
# /root/admin/webmon.sh www.yourcompany.com you@yourcompany.com,yourboss@yourcompany.com
# 3. Set a cron job to keep checking a web site every few minutes.
# */5 * * * * root /root/admin/webmon.sh www.yourcompany.com you@yourcompany.com,yourboss@yourcompany.com
TARGET=$1
OWNER=$2
WEBMONLOG=/tmp/$TARGET.log
export LANG=en_US
wget -S -t 1 -T 5 http://$TARGET/ -O /tmp/index.html -o $WEBMONLOG
RESULT=`grep "HTTP/1." $WEBMONLOG | awk '{print $2}'`
TIMEOUT=`grep "timed out" $WEBMONLOG | wc -l`
if [ $TIMEOUT == 1 ] || [ ! $RESULT == 200 ]; then
mail -s "[ALERT]$TARGET HTTP connection fail" $OWNER < $WEBMONLOG
fi
# clean up
rm -rf /tmp/index.html
rm -rf $WEBMONLOG
[/code]
這裡用到了wget的幾個參數, 主要是要取得HTTP的回應代碼, 並控制重試次數及連線的Timeout時間, 詳細說明如下
-S
--server-response
Print the headers sent by HTTP servers and responses sent by FTP servers.

-t number
--tries=number
Set number of retries to number. Specify 0 or inf for infinite retrying. The default is to retry 20 times, with the exception of fatal errors
like connection refused or not found (404), which are not retried.

-T seconds
--timeout=seconds
Set the network timeout to seconds seconds. This is equivalent to specifying --dns-timeout, --connect-timeout, and --read-timeout, all at the same time.
另外,這邊使用了export LANG=en_US來控制wget輸出訊息時的編碼為英文,以便配合cron使用.
使用時, 只需將webmon.sh放到/root/admin目錄下, 並更改權限為可執行, 然後在/etc/crontab中新增一行即可:
[code]*/5 * * * * root /root/admin/webmon.sh www.yourcompany.com you@yourcompany.com,yourboss@yourcompany.com[/code]]]> https://forum.andowson.com/posts/preList/220/335.page https://forum.andowson.com/posts/preList/220/335.page GMT