Linode + Livecode + Virtualmin

[Andre Garzia]

Bob,

I don't require a full server reboot. I just reboot the Apache server.
The watchdog is very simple but it requires an component running on a
different server. I will detail how I build it because it is dead
silly.

On the CentOS installation, I have a file called yes.txt whose content
is "YES". On my on-rev server, I have a Livecode script that tries to
load that yes.txt from my CentOS VPS. If it can read "YES" then it
will return true, if not, it will return false. Back on the CentOS
server, I have a cronjob running every five minutes. This cronjob will
load the script on the on-rev server and check to see if the result is
true or false. True means that the on-rev server is able to load a
page thru apache from the CentOS server, false usually means that
Apache is dead and no one noticed. If it receives true, nothing
happens but if it receives false, it runs an Apache reboot script that
has the following lines:

  pkill -9 httpd
  /etc/init.d/httpd start

The first line kills all Apache processes, the second restart it. It
also sends an email to my account telling me what happened.

=)

On Wed, Feb 8, 2012 at 2:39 PM, Bob Sneidar <bobs at twft.com> wrote:
> Hmmm... We use CentOS for a digital key system and we have the same problem. Randomly Apache will fail and we usually just restart the whole server to fix it. I would be interested in your watchdog app! You wouldn't mind sending that to me would you?
>
> Bob
>
>
> On Feb 7, 2012, at 7:20 PM, Andre Garzia wrote:
>
>> I don't like CentOS. I never did. I
>> think YUM is a bad manager and I don't like RPM based systems. But my
>> served worked fine up until some weeks ago when it started crashing
>> randomly. Every ten or so days, Apache would die. No log written. I
>> tried everything and I am yet to find what is causing the crash. The
>> correction is easy, I just need to reboot apache, so I built myself a
>> little watchdog that checks to see if Apache is actually serving my
>> page, if it stops, then my watchdog reboots it, the process takes less
>> than a minute.
>
>
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