nagios.cmd over nfs

[Thomas Guyot-Sionnest]

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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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