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NRPE: Unable to read output
Posted: Tue Aug 30, 2016 2:39 am
by sachinmw
output from local host
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/usr/local/nagios/libexec/check_nrpe -H localhost
NRPE v2.15
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/usr/local/nagios/libexec/check_init_service sshd openssh-daemon (pid 5643) is running...
output from nagios server
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/usr/local/nagios/libexec/check_nrpe -H 172.166.255.30
NRPE v2.15
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/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
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# 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?
Re: NRPE: Unable to read output
Posted: Tue Aug 30, 2016 1:11 pm
by 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.
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nagios ALL=NOPASSWD: /usr/local/nagios/libexec/check_init_service
Try that and let us know if this fixes the issue.
Re: NRPE: Unable to read output
Posted: Tue Aug 30, 2016 6:40 pm
by sachinmw
nagios is installed
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#find / -name nrpe
/usr/local/nagios/bin/nrpe
/usr/local/nagios/etc/nrpe
/etc/xinetd.d/nrpe
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#netstat -at | grep nrpe
tcp 0 0 *:nrpe *:* LISTEN
since nrpe is running via xinetd
/usr/local/nagios/etc/nrpe/common.cfg file
/usr/local/nagios/etc/nrpe.cfg file
permissions and ownership
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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
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# 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
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# 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
Re: NRPE: Unable to read output
Posted: Wed Aug 31, 2016 10:47 am
by tgriep
Can you login to the remote server as the nagios user and run the command?
Run the following and post the output.
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chage -l nagios
su nagios
/usr/local/nagios/libexec/check_init_service sshd
sudo /usr/local/nagios/libexec/check_init_service sshd
Re: NRPE: Unable to read output
Posted: Tue Sep 06, 2016 6:39 pm
by 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...
Re: NRPE: Unable to read output
Posted: Wed Sep 07, 2016 10:04 am
by tgriep
Edit the common.cfg file and change this line from
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command[check_init_service]=sudo /usr/local/nagios/libexec/check_init_service $ARG1$
to
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command[check_init_service]=/usr/local/nagios/libexec/check_init_service $ARG1$
Let us know if this works for you.
