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# vi /usr/local/nagios/etc/nrpe.cfg
# service xinetd restart
Stopping xinetd:                                           [  OK  ]
Starting xinetd:                                           [  OK  ]
# service nrpe restart
Shutting down nrpe                                         [  OK  ]
Starting nrpe                                              [  OK  ]
# /usr/local/nagios/libexec/check_nrpe -H 1.2.3.4 && tail -f /usr/local/nagios/var/nrpe.log
NRPE v3.2.1
[1535126185] is_an_allowed_host (AF_INET): is host >1.2.3.4< an allowed host >1.2.3.4<
[1535126185] Host 1.2.3.4 is not allowed to talk to us!
[1535126185] Connection from 1.2.3.4 closed.
[1535126219] CONN_CHECK_PEER: checking if host is allowed: 1.2.3.4 port 22153
[1535126219] Connection from 1.2.3.4 port 22153
[1535126219] is_an_allowed_host (AF_INET): is host >1.2.3.4< an allowed host >1.2.3.4<
[1535126219] Host 1.2.3.4 is not allowed to talk to us!
[1535126219] Connection from 1.2.3.4 closed.
[1535126228] Caught SIGTERM - shutting down...
[1535126228] Daemon shutdown
^C
# /usr/local/nagios/libexec/check_nrpe -H localhost && tail -f /usr/local/nagios/var/nrpe.log
CHECK_NRPE: Error - Could not connect to ::ffff:ffff:ffff:ffff: Connection reset by peer
# /usr/local/nagios/libexec/check_nrpe -H 127.0.0.1 && tail -f /usr/local/nagios/var/nrpe.log
NRPE v3.2.1
[1535126185] is_an_allowed_host (AF_INET): is host >1.2.3.4< an allowed host >1.2.3.4<
[1535126185] Host 1.2.3.4 is not allowed to talk to us!
[1535126185] Connection from 1.2.3.4 closed.
[1535126219] CONN_CHECK_PEER: checking if host is allowed: 1.2.3.4 port 22153
[1535126219] Connection from 1.2.3.4 port 22153
[1535126219] is_an_allowed_host (AF_INET): is host >1.2.3.4< an allowed host >1.2.3.4<
[1535126219] Host 1.2.3.4 is not allowed to talk to us!
[1535126219] Connection from 1.2.3.4 closed.
[1535126228] Caught SIGTERM - shutting down...
[1535126228] Daemon shutdown
^C
# /usr/local/nagios/libexec/check_nrpe -H host.domain.local && tail -f /usr/local/nagios/var/nrpe.log
NRPE v3.2.1
[1535126185] is_an_allowed_host (AF_INET): is host >1.2.3.4< an allowed host >1.2.3.4<
[1535126185] Host 1.2.3.4 is not allowed to talk to us!
[1535126185] Connection from 1.2.3.4 closed.
[1535126219] CONN_CHECK_PEER: checking if host is allowed: 1.2.3.4 port 22153
[1535126219] Connection from 1.2.3.4 port 22153
[1535126219] is_an_allowed_host (AF_INET): is host >1.2.3.4< an allowed host >1.2.3.4<
[1535126219] Host 1.2.3.4 is not allowed to talk to us!
[1535126219] Connection from 1.2.3.4 closed.
[1535126228] Caught SIGTERM - shutting down...
[1535126228] Daemon shutdown
^C
#

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# vi /usr/local/nagios/etc/nrpe.cfg
# service xinetd restart
Stopping xinetd:                                           [  OK  ]
Starting xinetd:                                           [  OK  ]
# service nrpe restart
Shutting down nrpe                                         [  OK  ]
Starting nrpe                                              [  OK  ]
# /usr/local/nagios/libexec/check_nrpe -H 1.2.3.4 && tail -f /usr/local/nagios/var/nrpe.log
CHECK_NRPE: Error - Could not connect to 1.2.3.4: Connection reset by peer
# /usr/local/nagios/libexec/check_nrpe -H localhost && tail -f /usr/local/nagios/var/nrpe.log
CHECK_NRPE: Error - Could not connect to ::ffff:ffff:ffff:ffff: Connection reset by peer
# /usr/local/nagios/libexec/check_nrpe -H 127.0.0.1 && tail -f /usr/local/nagios/var/nrpe.log
NRPE v3.2.1
[1535126185] is_an_allowed_host (AF_INET): is host >1.2.3.4< an allowed host >1.2.3.4<
[1535126185] Host 1.2.3.4 is not allowed to talk to us!
[1535126185] Connection from 1.2.3.4 closed.
[1535126219] CONN_CHECK_PEER: checking if host is allowed: 1.2.3.4 port 22153
[1535126219] Connection from 1.2.3.4 port 22153
[1535126219] is_an_allowed_host (AF_INET): is host >1.2.3.4< an allowed host >1.2.3.4<
[1535126219] Host 1.2.3.4 is not allowed to talk to us!
[1535126219] Connection from 1.2.3.4 closed.
[1535126228] Caught SIGTERM - shutting down...
[1535126228] Daemon shutdown
^C
# /usr/local/nagios/libexec/check_nrpe -H host.domain.local && tail -f /usr/local/nagios/var/nrpe.log
CHECK_NRPE: Error - Could not connect to 1.2.3.4: Connection reset by peer
#

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# /usr/local/nagios/libexec/check_nrpe -H 1.2.3.4 && tail -f /usr/local/nagios/var/nrpe.log
NRPE v3.2.1

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# /usr/local/nagios/libexec/check_nrpe -H host.domain.local -t 45 -c check_disk -a '-w 20% -c 10% -p /'
check_disk: Could not parse arguments
Usage:
 check_disk -w limit -c limit [-W limit] [-K limit] {-p path | -x device}
[-C] [-E] [-e] [-f] [-g group ] [-k] [-l] [-M] [-m] [-R path ] [-r path ]
[-t timeout] [-u unit] [-v] [-X type] [-N type] [-n]
#

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# /usr/local/nagios/libexec/check_disk -w 20% -c 10% -p /
DISK OK - free space: / 46243 MB (55.28% inode=97%);| /=37400MB;70487;79298;0;88109
#

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# /usr/local/nagios/libexec/check_nrpe -H host.domain.local -t 45 -c check_init_service -a 'crond'
ERROR: No service name specified on command line
#

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# /usr/local/nagios/libexec/check_nrpe -H host.domain.local -t 45 -c check_open_files -a '-w 30 -c 50'
Usage: -w <warn> -c <crit> [-t <timeout>] [-v version] [-h help]
#

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# /usr/local/nagios/libexec/check_nrpe -H host.domain.local -t 45 -c check_swap -a '-w 50 -c 20'
check_swap: Could not parse arguments
Usage:
check_swap [-av] -w <percent_free>% -c <percent_free>%
-w <bytes_free> -c <bytes_free>
#

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# /usr/local/nagios/libexec/check_nrpe -H host.domain.local -t 45 -c check_init_service -a 'sshd'
ERROR: No service name specified on command line
#

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# /usr/local/nagios/libexec/check_nrpe -H host.domain.local -t 45 -c check_init_service -a 'crond'
ERROR: No service name specified on command line
# tail -f /usr/local/nagios/var/nrpe.log
[1535376812] Connection from 1.2.3.4 port 4261
[1535376812] is_an_allowed_host (AF_INET): is host >1.2.3.4< an allowed host >1.2.3.4<
[1535376812] is_an_allowed_host (AF_INET): is host >1.2.3.4< an allowed host >1.2.3.4<
[1535376812] is_an_allowed_host (AF_INET): host is in allowed host list!
[1535376812] Host address is in allowed_hosts
[1535376812] Host 1.2.3.4 is asking for command 'check_init_service' to be run...
[1535376812] Running command: sudo /usr/local/nagios/libexec/check_init_service
[1535376812] Command completed with return code 3 and output: ERROR: No service name specified on command line
[1535376812] Return Code: 3, Output: ERROR: No service name specified on command line
[1535376812] Connection from 1.2.3.4 closed.
^C

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# /usr/local/nagios/libexec/check_nrpe --version
NRPE Plugin for Nagios
Version: 3.2.1

#

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

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#############################################################################
#
#  Sample NRPE Config File
#
#  Notes:
#
#  This is a sample configuration file for the NRPE daemon.  It needs to be
#  located on the remote host that is running the NRPE daemon, not the host
#  from which the check_nrpe client is being executed.
#
#############################################################################


# LOG FACILITY
# The syslog facility that should be used for logging purposes.

log_facility=daemon



# LOG FILE
# If a log file is specified in this option, nrpe will write to
# that file instead of using syslog.

log_file=/usr/local/nagios/var/nrpe.log



# DEBUGGING OPTION
# This option determines whether or not debugging messages are logged to the
# syslog facility.
# Values: 0=debugging off, 1=debugging on

debug=1



# PID FILE
# The name of the file in which the NRPE daemon should write it's process ID
# number.  The file is only written if the NRPE daemon is started by the root
# user and is running in standalone mode.

pid_file=/usr/local/nagios/var/nrpe.pid



# PORT NUMBER
# Port number we should wait for connections on.
# NOTE: This must be a non-privileged port (i.e. > 1024).
# NOTE: This option is ignored if NRPE is running under either inetd or xinetd

server_port=5666



# SERVER ADDRESS
# Address that nrpe should bind to in case there are more than one interface
# and you do not want nrpe to bind on all interfaces.
# NOTE: This option is ignored if NRPE is running under either inetd or xinetd

#server_address=127.0.0.1



# LISTEN QUEUE SIZE
# Listen queue size (backlog) for serving incoming connections.
# You may want to increase this value under high load.

#listen_queue_size=5



# NRPE USER
# This determines the effective user that the NRPE daemon should run as.
# You can either supply a username or a UID.
#
# NOTE: This option is ignored if NRPE is running under either inetd or xinetd

nrpe_user=nagios



# NRPE GROUP
# This determines the effective group that the NRPE daemon should run as.
# You can either supply a group name or a GID.
#
# NOTE: This option is ignored if NRPE is running under either inetd or xinetd

nrpe_group=nagios



# ALLOWED HOST ADDRESSES
# This is an optional comma-delimited list of IP address or hostnames
# that are allowed to talk to the NRPE daemon. Network addresses with a bit mask
# (i.e. 192.168.1.0/24) are also supported. Hostname wildcards are not currently
# supported.
#
# Note: The daemon only does rudimentary checking of the client's IP
# address.  I would highly recommend adding entries in your /etc/hosts.allow
# file to allow only the specified host to connect to the port
# you are running this daemon on.
#
# NOTE: This option is ignored if NRPE is running under either inetd or xinetd

allowed_hosts=127.0.0.1,::1,1.2.3.4



# COMMAND ARGUMENT PROCESSING
# This option determines whether or not the NRPE daemon will allow clients
# to specify arguments to commands that are executed.  This option only works
# if the daemon was configured with the --enable-command-args configure script
# option.
#
# *** ENABLING THIS OPTION IS A SECURITY RISK! ***
# Read the SECURITY file for information on some of the security implications
# of enabling this variable.
#
# Values: 0=do not allow arguments, 1=allow command arguments

dont_blame_nrpe=0



# BASH COMMAND SUBSTITUTION
# This option determines whether or not the NRPE daemon will allow clients
# to specify arguments that contain bash command substitutions of the form
# $(...).  This option only works if the daemon was configured with both
# the --enable-command-args and --enable-bash-command-substitution configure
# script options.
#
# *** ENABLING THIS OPTION IS A HIGH SECURITY RISK! ***
# Read the SECURITY file for information on some of the security implications
# of enabling this variable.
#
# Values: 0=do not allow bash command substitutions,
#         1=allow bash command substitutions

allow_bash_command_substitution=0



# COMMAND PREFIX
# This option allows you to prefix all commands with a user-defined string.
# A space is automatically added between the specified prefix string and the
# command line from the command definition.
#
# *** THIS EXAMPLE MAY POSE A POTENTIAL SECURITY RISK, SO USE WITH CAUTION! ***
# Usage scenario:
# Execute restricted commmands using sudo.  For this to work, you need to add
# the nagios user to your /etc/sudoers.  An example entry for allowing
# execution of the plugins from might be:
#
# nagios          ALL=(ALL) NOPASSWD: /usr/lib/nagios/plugins/
#
# This lets the nagios user run all commands in that directory (and only them)
# without asking for a password.  If you do this, make sure you don't give
# random users write access to that directory or its contents!

# command_prefix=/usr/bin/sudo


# MAX COMMANDS
# This specifies how many children processes may be spawned at any one
# time, essentially limiting the fork()s that occur.
# Default (0) is set to unlimited
# max_commands=0



# COMMAND TIMEOUT
# This specifies the maximum number of seconds that the NRPE daemon will
# allow plugins to finish executing before killing them off.

command_timeout=60



# CONNECTION TIMEOUT
# This specifies the maximum number of seconds that the NRPE daemon will
# wait for a connection to be established before exiting. This is sometimes
# seen where a network problem stops the SSL being established even though
# all network sessions are connected. This causes the nrpe daemons to
# accumulate, eating system resources. Do not set this too low.

connection_timeout=300



# WEAK RANDOM SEED OPTION
# This directive allows you to use SSL even if your system does not have
# a /dev/random or /dev/urandom (on purpose or because the necessary patches
# were not applied). The random number generator will be seeded from a file
# which is either a file pointed to by the environment valiable $RANDFILE
# or $HOME/.rnd. If neither exists, the pseudo random number generator will
# be initialized and a warning will be issued.
# Values: 0=only seed from /dev/[u]random, 1=also seed from weak randomness

#allow_weak_random_seed=1



# SSL/TLS OPTIONS
# These directives allow you to specify how to use SSL/TLS.

# SSL VERSION
# This can be any of: SSLv2 (only use SSLv2), SSLv2+ (use any version),
#        SSLv3 (only use SSLv3), SSLv3+ (use SSLv3 or above), TLSv1 (only use
#        TLSv1), TLSv1+ (use TLSv1 or above), TLSv1.1 (only use TLSv1.1),
#        TLSv1.1+ (use TLSv1.1 or above), TLSv1.2 (only use TLSv1.2),
#        TLSv1.2+ (use TLSv1.2 or above)
# If an "or above" version is used, the best will be negotiated. So if both
# ends are able to do TLSv1.2 and use specify SSLv2, you will get TLSv1.2.
# If you are using openssl 1.1.0 or above, the SSLv2 options are not available.

#ssl_version=SSLv2+

# SSL USE ADH
# This is for backward compatibility and is DEPRECATED. Set to 1 to enable
# ADH or 2 to require ADH. 1 is currently the default but will be changed
# in a later version.

#ssl_use_adh=1

# SSL CIPHER LIST
# This lists which ciphers can be used. For backward compatibility, this
# defaults to 'ssl_cipher_list=ALL:!MD5:@STRENGTH' for < OpenSSL 1.1.0,
# and 'ssl_cipher_list=ALL:!MD5:@STRENGTH:@SECLEVEL=0' for OpenSSL 1.1.0 and
# greater.

#ssl_cipher_list=ALL:!MD5:@STRENGTH
#ssl_cipher_list=ALL:!MD5:@STRENGTH:@SECLEVEL=0
#ssl_cipher_list=ALL:!aNULL:!eNULL:!SSLv2:!LOW:!EXP:!RC4:!MD5:@STRENGTH

# SSL Certificate and Private Key Files

#ssl_cacert_file=/etc/ssl/servercerts/ca-cert.pem
#ssl_cert_file=/etc/ssl/servercerts/nagios-cert.pem
#ssl_privatekey_file=/etc/ssl/servercerts/nagios-key.pem

# SSL USE CLIENT CERTS
# This options determines client certificate usage.
# Values: 0 = Don't ask for or require client certificates (default)
#         1 = Ask for client certificates
#         2 = Require client certificates

#ssl_client_certs=0

# SSL LOGGING
# This option determines which SSL messages are send to syslog. OR values
# together to specify multiple options.

# Values: 0x00 (0)  = No additional logging (default)
#         0x01 (1)  = Log startup SSL/TLS parameters
#         0x02 (2)  = Log remote IP address
#         0x04 (4)  = Log SSL/TLS version of connections
#         0x08 (8)  = Log which cipher is being used for the connection
#         0x10 (16) = Log if client has a certificate
#         0x20 (32) = Log details of client's certificate if it has one
#         -1 or 0xff or 0x2f = All of the above

#ssl_logging=0x00



# NASTY METACHARACTERS
# This option allows you to override the list of characters that cannot
# be passed to the NRPE daemon.

# nasty_metachars="|`&><'\\[]{};\r\n"



# COMMAND DEFINITIONS
# Command definitions that this daemon will run.  Definitions
# are in the following format:
#
# command[<command_name>]=<command_line>
#
# When the daemon receives a request to return the results of <command_name>
# it will execute the command specified by the <command_line> argument.
#
# Unlike Nagios, the command line cannot contain macros - it must be
# typed exactly as it should be executed.
#
# Note: Any plugins that are used in the command lines must reside
# on the machine that this daemon is running on!  The examples below
# assume that you have plugins installed in a /usr/local/nagios/libexec
# directory.  Also note that you will have to modify the definitions below
# to match the argument format the plugins expect.  Remember, these are
# examples only!


# The following examples use hardcoded command arguments...
# This is by far the most secure method of using NRPE

command[check_users]=/usr/local/nagios/libexec/check_users -w 5 -c 10
command[check_load]=/usr/local/nagios/libexec/check_load -r -w .15,.10,.05 -c .30,.25,.20
command[check_hda1]=/usr/local/nagios/libexec/check_disk -w 20% -c 10% -p /dev/hda1
command[check_zombie_procs]=/usr/local/nagios/libexec/check_procs -w 5 -c 10 -s Z
command[check_total_procs]=/usr/local/nagios/libexec/check_procs -w 150 -c 200


# The following examples allow user-supplied arguments and can
# only be used if the NRPE daemon was compiled with support for
# command arguments *AND* the dont_blame_nrpe directive in this
# config file is set to '1'.  This poses a potential security risk, so
# make sure you read the SECURITY file before doing this.

### MISC SYSTEM METRICS ###
#command[check_users]=/usr/local/nagios/libexec/check_users $ARG1$
#command[check_load]=/usr/local/nagios/libexec/check_load $ARG1$
command[check_disk]=/usr/local/nagios/libexec/check_disk $ARG1$
command[check_swap]=/usr/local/nagios/libexec/check_swap $ARG1$
command[check_cpu_stats]=/usr/local/nagios/libexec/check_cpu_stats.sh $ARG1$
command[check_mem]=/usr/local/nagios/libexec/custom_check_mem -n $ARG1$

### GENERIC SERVICES ###
command[check_init_service]=sudo /usr/local/nagios/libexec/check_init_service $ARG1$
#command[check_services]=/usr/local/nagios/libexec/check_services -p $ARG1$

### SYSTEM UPDATES ###
#command[check_yum]=/usr/local/nagios/libexec/check_yum
#command[check_apt]=/usr/local/nagios/libexec/check_apt

### PROCESSES ###
command[check_all_procs]=/usr/local/nagios/libexec/custom_check_procs
command[check_procs]=/usr/local/nagios/libexec/check_procs $ARG1$

### OPEN FILES ###
command[check_open_files]=/usr/local/nagios/libexec/check_open_files.pl $ARG1$

### NETWORK CONNECTIONS ###
#command[check_netstat]=/usr/local/nagios/libexec/check_netstat.pl -p $ARG1$ $ARG2$

### ASTERISK ###
#command[check_asterisk]=/usr/local/nagios/libexec/check_asterisk.pl $ARG1$
#command[check_sip]=/usr/local/nagios/libexec/check_sip $ARG1$
#command[check_asterisk_sip_peers]=sudo /usr/local/nagios/libexec/check_asterisk_sip_peers.sh $ARG1$
#command[check_asterisk_version]=/usr/local/nagios/libexec/nagisk.pl -c version
#command[check_asterisk_peers]=/usr/local/nagios/libexec/nagisk.pl -c peers
#command[check_asterisk_channels]=/usr/local/nagios/libexec/nagisk.pl -c channels
#command[check_asterisk_zaptel]=/usr/local/nagios/libexec/nagisk.pl -c zaptel
#command[check_asterisk_span]=/usr/local/nagios/libexec/nagisk.pl -c span -s 1



# INCLUDE CONFIG FILE
# This directive allows you to include definitions from an external config file.

#include=<somefile.cfg>



# INCLUDE CONFIG DIRECTORY
# This directive allows you to include definitions from config files (with a
# .cfg extension) in one or more directories (with recursion).

#include_dir=<somedirectory>
#include_dir=<someotherdirectory>

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### GENERIC SERVICES ###
command[check_init_service]=sudo /usr/local/nagios/libexec/check_init_service $ARG1$
command[check_services]=/usr/local/nagios/libexec/check_services -p $ARG1$

### MISC SYSTEM METRICS ###
#command[check_users]=/usr/local/nagios/libexec/check_users -w 5 -c 10
command[check_users]=/usr/local/nagios/libexec/check_users $ARG1$
command[check_load]=/usr/local/nagios/libexec/check_load $ARG1$
command[check_swap]=/usr/local/nagios/libexec/check_swap $ARG1$
command[check_cpu_stats]=/usr/local/nagios/libexec/check_cpu_stats.sh $ARG1$
command[check_mem]=/usr/local/nagios/libexec/custom_check_mem -n $ARG1$

### SYSTEM UPDATES ###
command[check_yum]=/usr/local/nagios/libexec/check_yum
command[check_apt]=/usr/local/nagios/libexec/check_apt

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

### PROCESSES ###
command[check_all_procs]=/usr/local/nagios/libexec/custom_check_procs
command[check_procs]=/usr/local/nagios/libexec/check_procs $ARG1$

### OPEN FILES ###
command[check_open_files]=/usr/local/nagios/libexec/check_open_files.pl $ARG1$

### NETWORK CONNECTIONS ###
command[check_netstat]=/usr/local/nagios/libexec/check_netstat.pl -p $ARG1$ $ARG2$

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# COMMAND ARGUMENT PROCESSING
# This option determines whether or not the NRPE daemon will allow clients
# to specify arguments to commands that are executed.  This option only works
# if the daemon was configured with the --enable-command-args configure script
# option.
#
# *** ENABLING THIS OPTION IS A SECURITY RISK! ***
# Read the SECURITY file for information on some of the security implications
# of enabling this variable.
#
# Values: 0=do not allow arguments, 1=allow command arguments

dont_blame_nrpe=0