nrpe check_disk

[crechet51]

Hello.
I have a ubuntu-server that I want to use as a monitoring server.

I installed nagios and nrpe on it.

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# /usr/local/nagios/libexec/check_nrpe -H localhost
NRPE v2.15

I need to check the remaining disk space on remote PCs.

Locally, the command looks something like this:

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# /usr/local/nagios/libexec/check_disk -w 20% -c 10% -p /
DISK OK - free space: / 14223 MB (72.35% inode=94%);| /=5433MB;15738;17705;0;19673

However, on the remote host (with nagios + nrpe installed):

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# ./check_nrpe -H remotehost -t 30 -c check_disk -a '30 10 /'
CHECK_NRPE: Receive header underflow - only 0 bytes received (4 expected).

Wherein:

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# /usr/local/nagios/libexec/check_nrpe -H remotehost
NRPE v2.15

That is, nrpe on the remote pc responds on server's requests.

I think that the matter is in the disk check command. How exactly does the check_disk call happen? Do I need an alias for this? Or what?

Thank you in advance.

[crechet51]

Found a problem.

It turns out that I did not describe the commands in commands.cfg
However, now a second problem has appeared - on the monitoring web page:

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NRPE: Command 'check_disk' not defined

[scottwilkerson]

Can you show the check_disk command you defined in the nrpe.cfg on the remote server?

[mbellerue]

Excellent that you got it moved forward! Can you post your command definition, and your service definition? We'll see if there's something in there stopping it from running correctly.

[crechet51]

Hello scottwilkerson and mbellerue.

Both on the server and on the remote PC, nagios.cfg pulls the commands from commands.cfg

In the commands.cfg check_disk is:

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define command {
    command_name    check_disk
    command_line    /usr/local/nagios/libexec/check_disk -w 10% -c 5% -p /
}

Am I doing something wrong?

[scottwilkerson]

Both on the server and on the remote PC, nagios.cfg pulls the commands from commands.cfg

that's not how check_nrpe works

When you run

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./check_nrpe -H remotehost -t 30 -c check_disk

the nagios server reaches out to remotehost on port 5666 (the NRPE port) and asks it to execute the command defined in it's nrpe.cfg that starts like

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command[check_disk]=...

If it is not found, you will get an error like

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NRPE: Command 'check_disk' not defined

It will often look something like this

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command[check_disk]=/usr/local/nagios/libexec/check_disk $ARG1$

you would execute this like

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./check_nrpe -H remotehost -t 30 -c check_disk -a '-w 20% -c 10% -p /'

[crechet51]

Yes! Thanks guys, you're right.

I just needed to enter the command in nrpe.cfg

Thanks a lot!

[scottwilkerson]

Yes! Thanks guys, you're right.

I just needed to enter the command in nrpe.cfg

Thanks a lot!

Glad you got it working!

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