Re: [Perfparse-users] perfparsed & pipe

[Yves <yme...@pe...>]

> Has anyone managed to use 'method 4' , i.e. make nagios write to a
> pipe that is read by perfparsed?
>
> I managed to get it to work once, but then I killed perfparsed and
> tried to restart it and it never comes up again. In the error log I
> see this:
> 2004/11/22 10:11:18 [log_reader.c:370   9800  ] Could not create fifo
> '/usr/local/nagios/var/perfparse.pipe'
>
> The problem is that perfparse.pipe still exists from the previous run.
> But you can't get rid of it, because nagios is constantly writing to
> it. If you remove it, it instantly reappears as a regular file!

Yes, of course. In a perfect world, nagios (the nagios command that outpu=
ts to the pipe)
should test if the file exists and if it is a pipe, or raise an error.
In our world, what can we do ?

> OK, I could shutdown nagios and restart perfparsed first and then
> nagios again, but this is not really an acceptable solution.

What version of nagios are you using ? Any version with some command that=
 printf >>
perfparse.pipe ? Or nagios-2.0cvs with the new feature : output perfdata =
to a pipe ?

In the second case, this would be a bug in nagios and should be addressed=
 to nagios
developers.
In the first case...
1 update your command to get closer from the perfect world ? You can do i=
t, but will
others do it too ?
2 update perfparsed to take care of this ? But fixing somewhere a bug of =
somewhere else
is never a good solution. We get away from the perfect world.
3 ask the user to reboot nagios at the same time as perfparsed restarts ?=
 But is this a
good solution ?


I have an idea for (2) : when perfparsed starts and finds the existing fi=
le
perfparse.pipe, it can rename it and create the fifo. Then it's your work=
 to cat
perfparse.pipe.old > perfparse.pipe. And it supposes that nagios closes t=
he file and
reopens it every time there is something to write. Otherwise, the only wa=
y is to reboot
nagios.

Is this a correct workaround ?


> My perfparse.cfg:
> nagios@naxos:~/etc$ cat perfparse.cfg

Please run perfparsed --show_config instead :)
In next version, I will write at the beginning of the exemple config file=
 to run the
binary with --show_config instead of showing the config file.
However, thanks for sending the config file that usually helps us to find=
 good things :)

Yves

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