nagios.cmd over nfs

[kyle.odonnell at gmail.com]

I was thinking of changing the cgi.cgi source to write to an actual
file on the nfs mount, and then have tail -f nfswrittenfile.cmd-pipe >
/path/to/nagios.cmd

On 1/22/08, Thomas Guyot-Sionnest <dermoth at aei.ca> wrote:
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> On 22/01/08 03:38 PM, kyle.odonnell at gmail.com wrote:
> > ... not so much
> >
> > It solves the web page spinning, but since nagios never picks up the
> > data nothing happens.
>
> Yep. As it was already said on the thread fifos only works locally. It
> implemented in the kernel, not in the FS code. The FS is only involved
> in giving it a name and permissions (and this trivial task is properly
> implemented by NFS: each server can use the pipe ... locally).
>
> A trivial (hacky) workaround could be using Netcat (nc):
>
> On the webserver:
>
> cat /path/to/nagios.cmd | nc <nagios_host> <some_port>
>
> On the Nagios server:
>
> nc -lp <some_port> >/path/to/nagios.cmd
>
> Since NC can die you should ideally run in with Daniel J Bernstein's
> Daemontools:
>
> http://cr.yp.to/daemontools.html
>
> Also try in UDP mode (nc -u host post / nc -lup port) if you have problems.
>
>
> The solution I'd go for though would be using Perl daemons for relaying
> the commands using code similar to these daemons:
>
> http://www.nagioscommunity.org/wiki/index.php/OCP_Daemon#OCP_daemon_code
> http://nagiosexchange.altinity.org/nagiosexchange/NPDaemon/
>
> It requires good Perl knowledge, especially since these daemons doesn't
> include any non-blocking sending function. Since the command pipe isn't
> much solicited you can just go blocking too (while (<FIFO>)/blocking
> send on the web server, blocking listen/blocking write to the nagios
> server), but make sure you implement timeouts with alarm() in the
> network code to avoid jamming there.
>
> Thomas
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