CODEWITHSUNDEEP
linuxnagioscentos7
user3193317
user3193317

Reputation: 141

Nagios: NRPE: Unable to read output

I have installed Nagios and NRPE plugins on the same server (CentOs 7).

The preinstalled services like check_disk work fine, but my manually intalled plugins always end up with following error:

/usr/local/nagios/libexec/check_nrpe -H localhost -c check_cpu -a 20 10
NRPE: Unable to read output

/usr/local/nagios/etc/objects/localhost.cfg:

define service{
    use                             local-service
    host_name                       localhost
    service_description             CPU
    check_command                   check_cpu!20!10
    notifications_enabled           0
    }

/usr/local/nagios/etc/objects/commands.cfg

define command {
    command_name    check_cpu
    command_line    $USER1$/check_nrpe -H $HOSTADDRESS$ -c check_cpu -t 30 -a $ARG1$ $ARG2$
}

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

command[check_users]=/usr/local/nagios/libexec/check_users -w 5 -c 10
command[check_load]=/usr/local/nagios/libexec/check_load -w 15,10,5 -c 30,25,20
command[check_disk]=/usr/local/nagios/libexec/check_disk -w 20 -c 10
command[check_procs]=/usr/local/nagios/libexec/check_procs -w 30 -c 200
command[check_cpu]=/usr/local/nagios/libexec/check_cpu_perf.sh -w $ARG1$ -c $ARG2$
command[check_procs_cron]=/usr/local/nagios/libexec/check_procs -a cron
command[check_mem]=/usr/local/nagios/libexec/check_mem_ng.sh -w $ARG1$ -c $ARG2$

Output messages.log

Nov 29 19:52:03 localhost xinetd[25346]: START: nrpe pid=25575 from=::ffff:127.0.0.1
Nov 29 19:52:03 localhost nrpe[25575]: INFO: SSL/TLS initialized. All network traffic will be encrypted.
Nov 29 19:52:03 localhost xinetd[25346]: EXIT: nrpe status=0 pid=25575 duration=0(sec)

additional information:

Output of /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
}

Output from netstat -at | grep nrpe:

tcp        0      0 localhost:51424         localhost:nrpe          TIME_WAIT
tcp6       0      0 [::]:nrpe               [::]:*                  LISTEN

Does anyone have a hint? Thanks

Upvotes: 3

Views: 9626

Answers (1)

user5366090
user5366090

Reputation:

In the command configuration file /usr/local/nagios/etc/objects/commands.cfg instead of $USER1$ try with absolute path - /usr/local/nagios/libexec/

Restart Nagios service and check.

One more thing I found in your question is you said "check_disk work fine, but my manually intalled plugins always end up with error" and in your /usr/local/nagios/etc/nrpe.cfg file there is a configuration of check_disk command command[check_disk]=/usr/local/nagios/libexec/check_disk -w 20 -c 10 but there is no configuration of check_cpu command. So when you try to execute this /usr/local/nagios/libexec/check_nrpe -H localhost -c check_cpu -a 20 10 it actually consults your nrpe.cfg file and found no check_cpu command configuration. Just add configuration for check_cpu in nrpe.cfg file and it should work then.

Upvotes: 1

Related Questions