NRPE: Unable to read output

[sachinmw]

output from local host

Code: Select all

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

Code: Select all

 /usr/local/nagios/libexec/check_init_service sshd  openssh-daemon (pid  5643) is running...

output from nagios server

Code: Select all

/usr/local/nagios/libexec/check_nrpe -H 172.166.255.30
NRPE v2.15

Code: Select all

/usr/local/nagios/libexec/check_nrpe -H 172.166.255.30 -c check_init_service -a sshd
NRPE: Unable to read output

contents of /etc/xinted.d/nrpe

Code: Select all

# 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       = Server.IP 127.0.0.1
}

I have tried all solutions I could find about this issue

any ideas what I am missing?

[tgriep]

The error you are receiving usually comes from either the plugin is not installed on the remote system or that the command settings in the nrpe.cfg is not setup correctly.
Make sure that the plugin is installed on the remote system and that the path for the command is defined correctly.
Also, that plugin's owner and group is the nagios user and that the nagios user can run it.
You also need to add the following in the /etc/sudoers file.

Code: Select all

nagios ALL=NOPASSWD: /usr/local/nagios/libexec/check_init_service

Try that and let us know if this fixes the issue.

[sachinmw]

nagios is installed

Code: Select all

#find / -name nrpe
/usr/local/nagios/bin/nrpe
/usr/local/nagios/etc/nrpe
/etc/xinetd.d/nrpe

netstat

Code: Select all

#netstat -at | grep nrpe
tcp        0      0 *:nrpe                      *:*                         LISTEN

since nrpe is running via xinetd
/usr/local/nagios/etc/nrpe/common.cfg file

common.cfg.txt

(1.49 KiB) Downloaded 356 times

/usr/local/nagios/etc/nrpe.cfg file

nrpe.cfg.txt

(7.24 KiB) Downloaded 391 times

permissions and ownership

Code: Select all

ls -l /usr/local/nagios/libexec/check_init_service
-rwxr-xr-x 1 nagios nagios 748 Feb  9  2016 /usr/local/nagios/libexec/check_init_service

sudoers file

Code: Select all

# grep nagios /etc/sudoers
User_Alias NAGIOS_USERS = %nagios
User_Alias NAGIOSXI_USERS=nagios
Cmnd_Alias NAGIOS_CMDS = /usr/local/nagios/libexec/check_init_service, /usr/local/nagios/libexec/check_mountpoints.sh
Cmnd_Alias NAGIOSXI_CMDS  = /etc/init.d/nagios *, /etc/init.d/ndo2db *, /etc/init.d/npcd *, /usr/bin/php /usr/local/nagiosxi/html/includes/components/autodiscovery/scripts/autodiscover_new.php *, /usr/local/nagiosxi/html/includes/components/profile/getprofile.sh, /usr/local/nagiosxi/scripts/upgrade_to_latest.sh, /usr/local/nagiosxi/scripts/change_timezone.sh, /usr/local/nagiosxi/scripts/manage_services.sh *, /usr/local/nagiosxi/scripts/reset_config_perms.sh
Cmnd_Alias NAGIOSXIWEB_CMDS = /usr/bin/tail -100 /var/log/messages, /usr/bin/tail -100 /var/log/httpd/error_log, /usr/bin/tail -100 /var/log/mysqld.log, /usr/bin/php /usr/local/nagiosxi/html/includes/components/autodiscovery/scripts/autodiscover_new.php *, /usr/local/nagiosxi/html/includes/components/profile/getprofile.sh, /etc/init.d/snmptt restart, /usr/local/nagiosxi/scripts/repair_databases.sh, /usr/local/nagiosxi/scripts/manage_services.sh *
Defaults:nagios !requiretty

Code: Select all

# grep NAGIOS_CMDS /etc/sudoers
Cmnd_Alias NAGIOS_CMDS = /usr/local/nagios/libexec/check_init_service, /usr/local/nagios/libexec/check_mountpoints.sh
NAGIOS_USERS ALL=NOPASSWD: NAGIOS_CMDS

[tgriep]

Can you login to the remote server as the nagios user and run the command?
Run the following and post the output.

Code: Select all

chage -l nagios
su nagios
/usr/local/nagios/libexec/check_init_service sshd
sudo /usr/local/nagios/libexec/check_init_service sshd

[sachinmw]

Code: Select all

[[email protected] ~]# chage -l nagios
Last password change                                    : Feb 02, 2016
Password expires                                        : May 02, 2016
Password inactive                                       : never
Account expires                                         : never
Minimum number of days between password change          : 0
Maximum number of days between password change          : 90
Number of days of warning before password expires       : 5
[[email protected] ~]# su nagios
[[email protected] root]$ /usr/local/nagios/libexec/check_init_service sshd
openssh-daemon (pid  5643) is running...
[[email protected] root]$ sudo /usr/local/nagios/libexec/check_init_service sshd
openssh-daemon (pid  5643) is running...

[tgriep]

Edit the common.cfg file and change this line from

Code: Select all

command[check_init_service]=sudo /usr/local/nagios/libexec/check_init_service $ARG1$

to

Code: Select all

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

Let us know if this works for you.