Re: [Sheflug] Software watchdog

["Chris J/#6" <nospam [at] nccnet.co.uk>]

> 	yes, something like that, but having the possibility of dealing
> with individual tasks (let's say that it checks apache, mysql and the
> network; if any of those ain't right, it takes the brute force approach
> of rebooting, or restarting the process if feasible).

In theory you should be able to do something like that with a simple shell 
script. Depending on how often you want the daemons checked, a crude watchdog 
(for say httpd) could conist of doing a wget on a certain page, and if the 
wget fails, the script can stop and restart the httpd daemon.

It doesn't matter if the script doesn't run ... if the httpd deamon's locked 
up, then there's a good chance most of the machine will have locked up, so the 
kernel watchdog can do a system reboot.

It depends how robust you want the thing in the end :) Monitoring daemons is 
much more a user-space issue rather than kernel-space, IMO.

Alternatively, you could try doing something with Linux-HA, which gives 
mirroring, heartbeats, IP address take over, etc ... I don't know how mature 
it is though - I've been asked my a friend to look into it, so I'll see :)

Chris...


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