[Sussex] Ping protocol

[Steve Dobson]

John

On 24 June 2003 at 17:10 John Crowhurst wrote:
> 
> > Do you know where I can learn about the Ping protocol, I can not find
> > it.
> >
> > All I want to do is write my own program so it informs me when something
> > has gone wrong with the connection.
> >
> > I have written an script to scan that IP address but that is rather
> > lame, keeping an shell running all the time.  I think more use full if I
> > get write an program that informed me when it goes wrong.
> 
> The simplest way is via a simple shell script:
> 
> if ping -c 1 host >/dev/null;
> then echo "OK"
> else echo "Not OK"
> #Do something about it here
> fi
> 
> All you need to do then is to place the script into your 
> crontab and it will check periodically.

What out for this.  I can be that the machine is still alive but
the application is dean.  This script will not tell you if Apache
has locked up.

Steve