On 11/04/13 00:27, Michael Beatty wrote:
All of the hosts that I will be monitoring have a backup. This backup is, for most all practical purposes, idle. It does nothing but sits and wait for someone to move it into production. The primary system copies files and database exports over to this backup system. I had no intention on running a Xymon client on these backup systems (though one would be installed and waiting to be started), the only monitoring is a ping test.
With that said, one exposure that exists on these backup systems is that the disk space in the file system has the potential to fill up. Is there any functionality built into xymon that would let me check the disk space on this remote system and report it back from the primary system?
My initial thought was to write an extension script that does an 'rsh backup du /home/user/' and parsing the results and test against a threshold, but I would prefer to utilize what is built into xymon before recreating the wheel.
Just mount the backup FS onto the live machine? Use sshfs, NFS, or whatever else is convenient. Make sure xymon is configured to report this type of remote mounted filesystems (I think the default is to not check remote mounts).
Personally, I'd prefer to install an actual xymon client, and monitor the backup machine fully to ensure that it will be fully operational when you need it. Nothing worse than having a problem on the live server, and then find the backup machine died last week but is still pingable, or whatever. Just consider Murphy's Law, it will fail in the worst possible way, at the worst possible time. (Or whatever he actually said).
Oh, going back to your original question... Adjust the xymonclient to call a local script instead of /usr/bin/df or whatever. Make that script call the local /usr/bin/df, as well as collect the data from the backup machine. Prepend "backup" to all device names and mountpoints on the backup server, and then combine the local and remote data together. This allows you to differentiate the backup system within xymon (ie, 75% full for production and 90% full for backup systems, etc).
Hope one of the above helps....
Regards, Adam
-- Adam Goryachev Website Managers www.websitemanagers.com.au