Software to monitor domains

[Ray Parrish]

Loïc Grenié wrote:
> 2008/11/17 Ray Parrish <crp at cmc.net>:
>   
>> Ray Parrish wrote:
>>     
>>> Ray Parrish wrote:
>>>
>>>       
>>>> Derek Broughton wrote:
>>>>
>>>>
>>>>         
>>>>> You won't find a Linux packaged solution to just do that because it's as
>>>>> simple as running a script that uses "wget" to get anything from the
>>>>> site (outputting it to /dev/null) and echos a message if wget fails,
>>>>> being careful to create no output at all when the wget succeeds.  Stick
>>>>> the script in cron, and you'll get an email every time it fails.
>>>>>
>>>>>
>>>>>
>>>>>           
>>>>         
>>> Hello,
>>>
>>> Well, it took me a little while, but I've come up with a solution that
>>> seems to work. Following is my code for two scripts I created. One
>>> starts the polling of the web site, and the other stops the polling script.
>>>
>>> [start of PollWebSite.sh]
>>> #!/bin/sh
>>> cd ~/SiteCheck
>>> touch go.txt
>>> while [ -e go.txt ]
>>> do
>>>     wget --connect-timeout=20 "$1" 2>/dev/null || xmessage "$1 is down";
>>>     rm index.html
>>>     sleep 10;
>>> done
>>> xmessage "Exiting Poll Web Site"
>>> [end of PollWebSite.sh]
>>>
>>> [start of StopPoll.sh]
>>> #!/bin/sh
>>> cd ~/SiteCheck
>>> rm go.txt
>>> [end of StopPoll.sh]
>>>
>>> I'm going to change the polling interval in actual use, I set it to loop
>>> fast so I could test the loop exit to be sure it worked. I of course
>>> created a folder named ~/SiteCheck first, but a person could add that to
>>> the script as well.
>>>
>>> Later, Ray Parrish
>>>
>>>
>>>       
>> Hello again,
>>
>> I've modified the script to play a sound file if the web site goes down,
>> as well as popping up a message. I tried with the cat command first, but
>> it only works with .au files, and try as I might I couldn't create an
>> .au file with any software I already had, or that I installed tonight. I
>> had to install the bplay command line sound file player so my script
>> could play a .wav file instead. Here is the modified code -
>>
>> [start of PollWebSite.sh]
>> #!/bin/sh
>> cd ~/SiteCheck;
>> touch go.txt;
>> while [ -e go.txt ]
>> do
>>    wget --connect-timeout=20 "$1" 2>/dev/null || xmessage -nearmouse
>> "$1 is down";
>>    if [ -e index.html ]
>>       then rm index.html;
>>       else bplay 1>/dev/null 2>/dev/null sitedown.wav;
>>    fi
>>    sleep 60;
>> done
>> xmessage "Exiting Web Site Monitor";
>> [end of PollWebSite.sh]
>>
>> This version tests to see if index.html was successfully downloaded, if
>> it was, it deletes it and goes to sleep, if the file doesn't exist it
>> plays the site down sound file, and of course the wget line pops up the
>> message box as well.
>>     
>
>     You'll get the sound only if you dismiss the xmessage box I think. You could
>   modify things that way:
>
> while [ -e go.txt ]
> do
>    if wget -o /dev/null --connect-timeout=20 "$1"
>    then
>        rm index.html
>    else
>        bplay sitedown.wav >/dev/null 2>&1
>        xmessage -nearmouse "$1 is down"
>    fi
>    sleep 60
> done
>
>         Loïc Grenié
>
>   
Thanks for the tip, I was forgetting that the call to xmessage would 
stop the script until the message was acknowledged. I have modified the 
script to close to what you have there now.

Later, Ray Parrish

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