[Help] Fix NRPE: Command 'check_swap' not defined

[bkavpro]

Hi everyone,


I'm sorry for my bad english.

My problem: I have 5 server linux, I already install "nagios-plugins-all nagios-plugins-nrpe nrpe" and config nagios on /etc/nagios/nrpe.cfg

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command[check_users]=/usr/lib64/nagios/plugins/check_users -w 5 -c 10
command[check_load]=/usr/lib64/nagios/plugins/check_load -w 15,10,5 -c 30,25,20
command[check_hda1]=/usr/lib64/nagios/plugins/check_disk -w 10% -c 5% -p /
command[check_hda2]=/usr/lib64/nagios/plugins/check_disk -w 15% -c 10% -p /mnt/data
command[check_zombie_procs]=/usr/lib64/nagios/plugins/check_procs -w 5 -c 10 -s Z
command[check_total_procs]=/usr/lib64/nagios/plugins/check_procs -w 300 -c 350
command[check_swap]=/usr/lib64/nagios/plugins/check_swap -w 50% -c 30%

Only 2 Server have check_swap working

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CPU Load
OK	12-20-2019 04:16:13	10d 16h 19m 19s	1/3	OK - load average: 0.12, 0.21, 0.34 
Check Disk_2
OK	12-20-2019 04:24:09	10d 16h 21m 23s	1/3	DISK OK - free space: /mnt/data 44034 MB (61% inode=97%): 
Check Root Partition
OK	12-20-2019 04:16:25	10d 14h 39m 7s	1/3	DISK OK - free space: / 4805 MB (48% inode=82%): 
Check Swap
OK	12-20-2019 04:15:40	10d 16h 19m 51s	1/3	SWAP OK - 100% free (5119 MB out of 5119 MB) 
Check Zombies
OK	12-20-2019 04:24:07	10d 16h 21m 23s	1/3	PROCS OK: 0 processes with STATE = Z 
Total Processes
OK	12-20-2019 04:18:14	10d 16h 17m 17s	1/3	PROCS OK: 101 processes 
Users Load
OK	12-20-2019 04:15:46	10d 16h 19m 45s	1/3	USERS OK - 1 users currently logged in 

But last 3 server get error with check_swap

CRITICAL 12-20-2019 04:17:20 0d 2h 12m 11s 3/3 NRPE: Command 'check_swap' not defined

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CPU Load
OK	12-20-2019 04:19:04	0d 2h 16m 27s	1/3	OK - load average: 0.18, 0.14, 0.16 
Check Disk_2
OK	12-20-2019 04:20:29	0d 2h 15m 2s	1/3	DISK OK - free space: /mnt/data 50892 MiB (71.06% inode=96%): 
Check Root Partition
OK	12-20-2019 04:21:55	0d 2h 13m 36s	1/3	DISK OK - free space: / 9781 MiB (32.59% inode=94%): 
Check Swap
CRITICAL	12-20-2019 04:17:20	0d 2h 12m 11s	3/3	NRPE: Command 'check_swap' not defined 
Check Zombies
OK	12-20-2019 04:24:46	0d 2h 10m 45s	1/3	PROCS OK: 0 processes with STATE = Z 
Total Processes
OK	12-20-2019 04:16:11	0d 2h 9m 20s	1/3	PROCS OK: 145 processes 
Users Load
OK	12-20-2019 04:17:37	0d 2h 7m 54s	1/3	USERS OK - 1 users currently logged in 

I try fix: Update nagios plugin, change URL plugin from /usr/lib64/nagios/plugins/ to /usr/local/nagios/libexec/ but still not work. I try go forum and read many post but can not fix it.

Please, anyone can help me to fix that problem, thank you.
Have a nice day,

=================================================================================

Thanks to @scottwilkerson for help me fix it,

Ok, you were making edits to /etc/nagios/nrpe.cfg but NRPE is running under xinetd using /usr/local/nagios/etc/nrpe.cfg

Maike your changes in /usr/local/nagios/etc/nrpe.cfg then restart xinetd

[scottwilkerson]

On one of the servers that isn't working can you show the output of the following

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ps -ef|grep nrpe

[bkavpro]

On one of the servers that isn't working can you show the output of the following

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ps -ef|grep nrpe

Hi scottwilkerson,

This is output :

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[root@test-1 ~]# ps -ef|grep nrpe
root      2378  2360  0 01:34 pts/0    00:00:00 grep --color=auto nrpe

I also check other server and output same ,

Thanks,

[scottwilkerson]

Can you show the output of the following on a server that isn't working
netstat -nlp|grep 5666

[bkavpro]

Can you show the output of the following on a server that isn't working
netstat -nlp|grep 5666

Hi scottwilkerson, port 5666 still listen by xinetd

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[root@test-1 ~]# netstat -nlp|grep 5666
tcp        0      0 :::5666                     :::*                        LISTEN      28257/xinetd

[scottwilkerson]

Ok, so let's look at the following and see what the location of the nrpe.cfg the xinetd process is using for nrpe

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cat /etc/xinetd.d/nrpe

[bkavpro]

Ok, so let's look at the following and see what the location of the nrpe.cfg the xinetd process is using for nrpe

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cat /etc/xinetd.d/nrpe

Yes, This is my config :

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[root@test-1 ~]# cat /etc/xinetd.d/nrpe
# default: on
# description: NRPE (Nagios Remote Plugin Executor)
service nrpe
{
        flags           = REUSE
        socket_type     = stream
        port            = 5666
        wait            = no
        user            = nagios
        group           = nagios
        server          = /usr/local/nagios/bin/nrpe
        server_args     = -c /usr/local/nagios/etc/nrpe.cfg --inetd
        log_on_failure  += USERID
        disable         = no
#       only_from       = 127.0.0.1
}

Thanks,

[scottwilkerson]

Ok, you were making edits to /etc/nagios/nrpe.cfg but NRPE is running under xinetd using /usr/local/nagios/etc/nrpe.cfg

Maike your changes in /usr/local/nagios/etc/nrpe.cfg then restart xinetd

[bkavpro]

Ok, you were making edits to /etc/nagios/nrpe.cfg but NRPE is running under xinetd using /usr/local/nagios/etc/nrpe.cfg

Maike your changes in /usr/local/nagios/etc/nrpe.cfg then restart xinetd

Hi scottwilkerson,

Thank you so much, that way to fix my problem.

But now I have new problem: 2 server can not upgrade NRPE from v2.15 to v3.2.1, I use this post for upgrade my NRPE: https://support.nagios.com/kb/article/n ... e-515.html , it's work on 3 server and other still show

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[root@wama2 plugins]# /usr/lib64/nagios/plugins/check_nrpe -H 127.0.0.1
NRPE v2.15

I try copy new file NRPE v3.2.1 and still show older version, Do you know how to fix it ?

Thanks for your help.

Have a nice day,

[scottwilkerson]

If you upgraded using those instructions the file is likely located in /usr/local/nagios/bin/nrpe

and uses the service command vs. xinetd

What you would need to do is remove /etc/xinetd.d/nrpe then restart xinetd
service xinetd restart

then start the nrpe service

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service nrpe start

One note is that this will also likely expect to use the config located at /usr/local/nagios/etc/nrpe.cfg and you will need to add your nagios server to the allowed_hosts section of that configuration file.