Configure nagios Plugins or Commands

Configure nagios Plugins or Commands

In a standard install of nagios, from platform independent source files there are the following check commands/plugins installed by default:-

check_by_ssh
check_disk
check_disk_smb
check_dns
check_dummy
check_flexlm
check_ftp
check_http
check_imap
check_ircd
check_load
check_log
check_mailq
check_mrtg
check_mrtgtraf
check_nagios
check_nntp
check_ntp
check_nwstat
check_overcr
check_ping
check_pop
check_procs
check_real
check_rpc
check_sensors
check_smtp
check_ssh
check_swap
check_tcp
check_time
check_udp
check_ups
check_users
check_vsz
check_wave

We will deal with each in turn and how you might like to specify them in the $NAGIOSHOME/etc/checkcommands.cfg file. Where there are parameters available for a command, these can be passed through from services.cfg

check_by_ssh

This plugin will execute a command on a remote host using SSH

Usage:

check_by_ssh [-f46] [-t timeout] [-i identity] [-l user] -H <host> -C <command> [-n name] [-s servicelist] [-O outputfile] [-p port]
check_by_ssh -V prints version info
check_by_ssh -h prints more detailed help

Options:

-H, --hostname=HOST name or IP address of remote host
-C, --command='COMMAND STRING' command to execute on the remote machine
-f tells ssh to fork rather than create a tty
-t, --timeout=INTEGER specify timeout (default: 10 seconds) [optional]
-p, --port=PORT port to connect to on remote system [optional]
-l, --logname=USERNAME SSH user name on remote host [optional]
-i, --identity=KEYFILE identity of an authorized key [optional]
-O, --output=FILE external command file for nagios [optional]
-s, --services=LIST list of nagios service names, separated by ':' [optional]
-n, --name=NAME short name of host in nagios configuration [optional]
-4, --use-ipv4 tell ssh to use IPv4
-6, --use-ipv6 tell ssh to use IPv6

The most common mode of use is to refer to a local identity file with the '-i' option. In this mode, the identity pair should have a null passphrase and the public key should be listed in the authorized_keys file of the remote host. Usually the key will be restricted to running only one command on the remote server. If the remote SSH server tracks invocation agruments, the one remote program may be an agent that can execute additional commands as proxy

To use passive mode, provide multiple '-C' options, and provide all of -O, -s, and -n options (servicelist order must match '-C' options)

check_disk

This plugin will check the percent of used disk space on a mounted file system and generate an alert if percentage is above one of the threshold values.

Usage:

check_disk -w limit -c limit [-p path] [-t timeout] [-m] [--verbose]
check_disk (-h|--help)
check_disk (-V|--version)

Options:

-w, --warning=INTEGER Exit with WARNING status if less than INTEGER kilobytes of disk are free
-w, --warning=PERCENT% Exit with WARNING status if more than PERCENT of disk space is free
-c, --critical=INTEGER Exit with CRITICAL status if less than INTEGER kilobytes of disk are free
-c, --critical=PERCENT% Exit with CRITCAL status if more than PERCENT of disk space is free
-p, --path=PATH, --partition=PARTTION Path or partition (checks all mounted partitions if unspecified)
-m, --mountpoint Display the mountpoint instead of the partition
-v, --verbose Show details for command-line debugging (do not use with nagios server)
-h, --help Print detailed help screen
-V, --version Print version information

check_disk_smb

This plugin will check the percent of used disk space on a mounted file system and generate an alert if percentage is above one of the threshold values.

Usage:

check_disk -w limit -c limit [-p path] [-t timeout] [-m] [--verbose]
check_disk (-h|--help)
check_disk (-V|--version)

Options:

check_dns -H host [-s server] [-a expected-address] [-t timeout]
check_dns --help
check_dns --version

-H, --hostname=HOST The name or address you want to query
-s, --server=HOST Optional DNS server you want to use for the lookup
-a, --expected-address=IP-ADDRESS Optional IP address you expect the DNS server to return
-t, --timeout=INTEGER Seconds before connection times out (default: 10)
-h, --help Print detailed help
-V, --version Print version numbers and license information

This plugin uses the nslookup program to obtain the IP address for the given host/domain query. A optional DNS server to use may be specified. If no DNS server is specified, the default server(s) specified in /etc/resolv.conf will be used.

check_dummy

Usage:

./check_dummy <integer state>

This plugin will simply return the state corresponding to the numeric value of the <state> argument.

check_flexlm

Check available flexlm license managers

Usage:

check_flexlm -F <filename> [--verbose]
check_flexlm --help
check_flexlm --version

-F, --filename=FILE Name of license file
-v, --verbose Print some extra debugging information (not advised for normal operation)
-V, --version Show version and license information
-h, --help Show this help screen

check_ftp

This plugin tests FTP connections with the specified host.

Usage:

check_ftp -H host -p port [-w warn_time] [-c crit_time] [-s send] [-e expect] [-W wait] [-t to_sec] [-v]

Options:

-H, --hostname=ADDRESS Host name argument for servers using host headers (use numeric
address if possible to bypass DNS lookup).
-p, --port=INTEGER Port number
-s, --send=STRING String to send to the server
-e, --expect=STRING String to expect in server response -W, --wait=INTEGER Seconds to wait between sending string and polling for response
-w, --warning=DOUBLE Response time to result in warning status (seconds)
-c, --critical=DOUBLE Response time to result in critical status (seconds)
-t, --timeout=INTEGER Seconds before connection times out (default: 10)
-v Show details for command-line debugging (do not use with nagios server)
-h, --help Print detailed help screen
-V, --version Print version information

check_http

This plugin tests the HTTP service on the specified host. It can test normal (http) and secure (https) servers, follow redirects, search for strings and regular expressions, check connection times, and report on
certificate expiration times.

Usage:

NOTE: One or both of -H and -I must be specified

Options:

-H, --hostname=ADDRESS Host name argument for servers using host headers (virtual host)
-I, --IP-address=ADDRESS IP address or name (use numeric address if possible to bypass DNS lookup).
-e, --expect=STRING String to expect in first (status) line of server response (default: HTTP/1.)
If specified skips all other status line logic (ex: 3xx, 4xx, 5xx processing)
-s, --string=STRING String to expect in the content
-u, --url=PATH URL to GET or POST (default: /)
-p, --port=INTEGER Port number (default: 80)
-P, --post=STRING URL encoded http POST data
-w, --warning=INTEGER Response time to result in warning status (seconds)
-c, --critical=INTEGER Response time to result in critical status (seconds)
-t, --timeout=INTEGER Seconds before connection times out (default: 10)
-a, --authorization=AUTH_PAIR Username:password on sites with basic authentication
-L, --link=URL Wrap output in HTML link (obsoleted by urlize)
-f, --onredirect=<ok|warning|critical|follow> How to handle redirected pages
-S, --ssl Connect via SSL
-C, --certificate=INTEGER Minimum number of days a certificate has to be valid.
(when this option is used the url is not checked.)
-v, --verbose Show details for command-line debugging (do not use with nagios server)
-h, --help Print detailed help screen
-V, --version Print version information

This plugin can also check whether an SSL enabled web server is able to serve content (optionally within a specified time) or whether the X509 certificate is still valid for the specified number of days.

CHECK CONTENT: check_http -w 5 -c 10 --ssl www.debian.org

When the 'www.debian.org' server returns its content within 5 seconds, a STATE_OK will be returned. When the server returns its content but exceeds the 5-second threshold, a STATE_WARNING will be returned. When an error occurs,a STATE_CRITICAL will be returned.

CHECK CERTIFICATE: check_http www.debian.org -C 14

When the certificate of 'www.debian.org' is valid for more than 14 days, a STATE_OK is returned. When the certificate is still valid, but for less than 14 days, a STATE_WARNING is returned. A STATE_CRITICAL will be returned when the certificate is expired.

check_imap

This plugin tests IMAP connections with the specified host.

Usage:

check_imap -H host -p port [-w warn_time] [-c crit_time] [-s send] [-e expect] [-W wait] [-t to_sec] [-v]

Options:

-H, --hostname=ADDRESS Host name argument for servers using host headers (use numeric
address if possible to bypass DNS lookup).
-p, --port=INTEGER Port number
-s, --send=STRING String to send to the server
-e, --expect=STRING String to expect in server response -W, --wait=INTEGER Seconds to wait between sending string and polling for response -w, --warning=DOUBLE Response time to result in warning status (seconds)
-c, --critical=DOUBLE Response time to result in critical status (seconds)
-t, --timeout=INTEGER Seconds before connection times out (default: 10)
-v Show details for command-line debugging (do not use with nagios server)
-h, --help Print detailed help screen
-V, --version Print version information

check_ircd

Perl Check IRCD plugin for Nagios

Usage:

check_ircd -H <host> [-w <warn>] [-c <crit>] [-p <port>]

-H, --hostname=HOST Name or IP address of host to check
-w, --warning=INTEGER Number of connected users which generates a warning state (Default: 50)
-c, --critical=INTEGER Number of connected users which generates a critical state (Default: 100)
-p, --port=INTEGER Port that the ircd daemon is running on <host> (Default: 6667)
-v, --verbose Print extra debugging information

check_load

This plugin tests the current system load average.

Usage:

check_load -w WLOAD1,WLOAD5,WLOAD15 -c CLOAD1,CLOAD5,CLOAD15
check_load --version
check_load --help

Options:

-w, --warning=WLOAD1,WLOAD5,WLOAD15 Exit with WARNING status if load average exceeds WLOADn
-c, --critical=CLOAD1,CLOAD5,CLOAD15 Exit with CRITICAL status if load average exceed CLOADn
-h, --help Print detailed help screen
-V, --version Print version information

the load average format is the same used by "uptime" and "w"

check_log

Usage: check_log -F logfile -O oldlog -q query
Usage: check_log --help
Usage: check_log --version

Log file pattern detector plugin for Nagios

check_mailq

Usage:

check_mailq [-w <warn>] [-c <crit>] [-t <timeout>] [-v verbose]

Checks the number of messages in the mail queue Feedback/patches to support non-sendmail mailqueue welcome

-w (--warning) = Min. number of messages in queue to generate warning
-c (--critical) = Min. number of messages in queu to generate critical alert ( w < c )
-t (--timeout) = Plugin timeout in seconds (default = 15)
-h (--help)
-V (--version)
-v (--verbose) = deebugging output

check_mrtg

This plugin will check either the average or maximum value of one of the
two variables recorded in an MRTG log file.

Usage:

check_mrtg -F log_file -a <AVG | MAX> -v variable -w warning -c critical [-l label] [-u units] [-e expire_minutes] [-t timeout] [-v]
check_mrtg (-h | --help) for detailed help
check_mrtg (-V | --version) for version information

Options:

-F, --logfile=FILE The MRTG log file containing the data you want to monitor
-e, --expires=MINUTES Minutes before MRTG data is considered to be too old
-a, --aggregation=AVG|MAX Should we check average or maximum values?
-v, --variable=INTEGER Which variable set should we inspect? 1 or 2?
-w, --warning=INTEGER Threshold value for data to result in WARNING status
-c, --critical=INTEGER Threshold value for data to result in CRITICAL status
-l, --label=STRING Type label for data (Examples: Conns, "Processor Load", In, Out)
-u, --units=STRING Option units label for data (Example: Packets/Sec, Errors/Sec,
"Bytes Per Second", "% Utilization")
-h, --help Print detailed help screen
-V, --version Print version information

If the value exceeds the <vwl> threshold, a WARNING status is returned. If the value exceeds the <vcl> threshold, a CRITICAL status is returned. If the data in the log file is older than <expire_minutes> old, a WARNING status is returned and a warning message is printed.

This plugin is useful for monitoring MRTG data that does not correspond to bandwidth usage. (Use the check_mrtgtraf plugin for monitoring bandwidth).It can be used to monitor any kind of data that MRTG is monitoring - errors,packets/sec, etc. I use MRTG in conjuction with the Novell NLM that allows
me to track processor utilization, user connections, drive space, etc and this plugin works well for monitoring that kind of data as well.

Notes:- This plugin only monitors one of the two variables stored in the MRTG log file. If you want to monitor both values you will have to define two commands with different values for the <variable> argument. Of course,you can always hack the code to make this plugin work for you.

- MRTG stands for the Multi Router Traffic Grapher. It can be downloaded from here

check_mrtgtraf

This plugin tests the UPS service on the specified host.

Usage:

check_mrtgtraf -F <log_file> -a <AVG | MAX> -v <variable> -w <warning_pair> -c <critical_pair>
[-e expire_minutes] [-t timeout] [-v]
check_mrtgtraf --help
check_mrtgtraf --version

Options:

-F, --filename=STRING File to read log from
-e, --expires=INTEGER Minutes after which log expires
-a, --aggregation=(AVG|MAX) Test average or maximum -w, --warning
Warning threshold pair "<incoming>,<outgoing>"
-c, --critical Critical threshold pair "<incoming>,<outgoing>"
-h, --help Print detailed help screen
-V, --version Print version information

check_nagios

This plugin attempts to check the status of the Nagios process on the local machine. The plugin will check to make sure the Nagios status log is no older than the number of minutes specified by the <expire_minutes> option. It also uses the /bin/ps command to check for a process matching whatever you specify
by the <process_string> argument.

Usage:

check_nagios -F <status log file> -e <expire_minutes> -C <process_string>

Options:

-F, --filename=FILE Name of the log file to check
-e, --expires=INTEGER Seconds aging afterwhich logfile is condsidered stale
-C, --command=STRING Command to search for in process table
-h, --help Print this help screen
-V, --version Print version information

Example:

./check_nagios -H /usr/local/nagios/var/status.log -e 5 -C /usr/local/nagios/bin/nagios

check_nntp

This plugin tests NNTP connections with the specified host.

Usage:

check_nntp -H host -p port [-w warn_time] [-c crit_time] [-s send] [-e expect] [-W wait] [-t to_sec] [-v]

Options:

-H, --hostname=ADDRESS Host name argument for servers using host headers (use numeric address if possible to bypass DNS lookup).
-p, --port=INTEGER Port number
-s, --send=STRING String to send to the server
-e, --expect=STRING String to expect in server response -W, --wait=INTEGER Seconds to wait between sending string and polling for response
-w, --warning=DOUBLE Response time to result in warning status (seconds)
-c, --critical=DOUBLE Response time to result in critical status (seconds)
-t, --timeout=INTEGER Seconds before connection times out (default: 10)
-v Show details for command-line debugging (do not use with nagios server)
-h, --help Print detailed help screen
-V, --version Print version information

check_ntp

Usage:

check_ntp -H <host> [-w <warn>] [-c <crit>] [-v verbose]

<warn> = Clock offset in seconds at which a warning message will be generated.Defaults to 60.
<crit> = Clock offset in seconds at which a critical message will be generated.Defaults to 120.

The same warning and critical values are used to check against the dispersion column of ntpdc/xntpdc for the host being queried.

check_nwstat

This plugin attempts to contact the MRTGEXT NLM running on a Novell server to gather the requested system information.

Usage:

check_nwstat -H host [-v variable] [-w warning] [-c critical] [-p port] [-t timeout]
check_nwstat (-h | --help) for detailed help
check_nwstat (-V | --version) for version information

Options:

-H, --hostname=HOST Name of the host to check
-v, --variable=STRING Variable to check. Valid variables include:
LOAD1 = 1 minute average CPU load
LOAD5 = 5 minute average CPU load
LOAD15 = 15 minute average CPU load
CONNS = number of currently licensed connections
VPF<vol> = percent free space on volume <vol>
VKF<vol> = KB of free space on volume <vol>
LTCH = percent long term cache hits
CBUFF = current number of cache buffers
CDBUFF = current number of dirty cache buffers
LRUM = LRU sitting time in minutes
DSDB = check to see if DS Database is open
LOGINS = check to see if logins are enabled
UPRB = used packet receive buffers
PUPRB = percent (of max) used packet receive buffers
SAPENTRIES = number of entries in the SAP table
SAPENTRIES<n> = number of entries in the SAP table for SAP type <n>
OFILES = number of open files
VPP<vol> = percent purgeable space on volume <vol>
VKP<vol> = KB of purgeable space on volume <vol>
VPNP<vol> = percent not yet purgeable space on volume <vol>
VKNP<vol> = KB of not yet purgeable space on volume <vol>
ABENDS = number of abended threads (NW 5.x only)
CSPROCS = number of current service processes (NW 5.x only)
-w, --warning=INTEGER Threshold which will result in a warning status
-c, --critical=INTEGER Threshold which will result in a critical status
-p, --port=INTEGER Optional port number (default: 9999)
-t, --timeout=INTEGER Seconds before connection attempt times out (default: 10)
-o, --osversion Include server version string in results
-h, --help Print this help screen
-V, --version Print version information

Notes:
- This plugin requres that the MRTGEXT.NLM file from James Drews' MRTG extension for NetWare be loaded on the Novell servers you wish to check.(available from http://www.engr.wisc.edu/~drews/mrtg/)
- Values for critical thresholds should be lower than warning thresholds when the following variables are checked: VPF, VKF, LTCH, CBUFF, and LRUM.

check_overcr

This plugin attempts to contact the Over-CR collector daemon running on the remote UNIX server in order to gather the requested system information. This plugin requres that Eric Molitors' Over-CR collector daemon be running on the remote server. Over-CR can be downloaded from http://www.molitor.org/overcr
(This plugin was tested with version 0.99.53 of the Over-CR collector)

Usage:

check_overcr -H host [-p port] [-v variable] [-w warning] [-c critical] [-t timeout]

Options:

-H, --hostname=HOST Name of the host to check
-p, --port=INTEGER Optional port number (default: 2000)
-v, --variable=STRING Variable to check. Valid variables include:
LOAD1 = 1 minute average CPU load
LOAD5 = 5 minute average CPU load
LOAD15 = 15 minute average CPU load
DPU<filesys> = percent used disk space on filesystem <filesys>
PROC<process> = number of running processes with name <process>
NET<port> = number of active connections on TCP port <port>
UPTIME = system uptime in seconds
-w, --warning=INTEGER Threshold which will result in a warning status
-c, --critical=INTEGER Threshold which will result in a critical status
-t, --timeout=INTEGER Seconds before connection attempt times out (default: 10)
-h, --help Print this help screen
-V, --version Print version information

Notes:
- For the available options, the critical threshold value should always be higher than the warning threshold value, EXCEPT with the uptime variable (i.e. lower uptimes are worse).

check_ping

Use ping to check connection statistics for a remote host.

Usage:

check_ping -H <host_address> -w <wrta>,<wpl>%% -c <crta>,<cpl>%% [-p packets] [-t timeout] [-L]
check_ping (-h | --help) for detailed help
check_ping (-V | --version) for version information

Options:

-H, --hostname=HOST host to ping
-w, --warning=THRESHOLD warning threshold pair
-c, --critical=THRESHOLD critical threshold pair
-p, --packets=INTEGER number of ICMP ECHO packets to send (Default: 5)
-t, --timeout=INTEGER optional specified timeout in second (Default: 10)
-L, --link show HTML in the plugin output (obsoleted by urlize)
THRESHOLD is <rta>,<pl>% where <rta> is the round trip average travel time (ms) which triggers a WARNING or CRITICAL state, and <pl> is the percentage of packet loss to trigger an alarm state.

This plugin uses the ping command to probe the specified host for packet loss (percentage) and round trip average (milliseconds). It can produce HTML output linking to a traceroute CGI contributed by Ian Cass. The CGI can be found in the contrib area of the downloads section at http://www.nagios.org/

check_pop

This plugin tests POP connections with the specified host.

Usage:

check_pop -H host -p port [-w warn_time] [-c crit_time] [-s send] [-e expect] [-W wait] [-t to_sec] [-v]

Options:

-H, --hostname=ADDRESS Host name argument for servers using host headers (use numeric address if possible to bypass DNS lookup).
-p, --port=INTEGER Port number
-s, --send=STRING String to send to the server
-e, --expect=STRING String to expect in server response -W, --wait=INTEGER Seconds to wait between sending string and polling for response
-w, --warning=DOUBLE Response time to result in warning status (seconds)
-c, --critical=DOUBLE Response time to result in critical status (seconds)
-t, --timeout=INTEGER Seconds before connection times out (default: 10)
-v Show details for command-line debugging (do not use with nagios server)
-h, --help Print detailed help screen
-V, --version Print version information

check_procs

Check the number of currently running processes and generates WARNING or CRITICAL states if the process count is outside the specified threshold ranges. The process count can be filtered by process owner, parent process PID, current state (e.g., 'Z'), or may be the total number of running processes

Usage:

check_procs -w <range> -c <range> [-s state] [-p ppid] [-u user] [-a argument-array] [-C command]
check_procs --version
check_procs --help

Required Arguments:

-w, --warning=RANGE generate warning state if process count is outside this range
-c, --critical=RANGE generate critical state if process count is outside this range

Optional Filters:

-s, --state=STATUSFLAGS Only scan for processes that have, in the output of `ps`, one or more of the status flags you specify (for example R, Z, S, RS,RSZDT, plus others based on the output of your 'ps' command).
-p, --ppid=PPID Only scan for children of the parent process ID indicated.
-u, --user=USER Only scan for proceses with user name or ID indicated.
-a, --argument-array=STRING Only scan for ARGS that match up to the length of the given STRING
-C, --command=COMMAND Only scan for exact matches to the named COMMAND.

RANGEs are specified 'min:max' or 'min:' or ':max' (or 'max'). If specified 'max:min', a warning status will be generated if the count is inside the specified range

check_real

This plugin tests the REAL service on the specified host.

Usage:

check_real -H host [-e expect] [-p port] [-w warn] [-c crit] [-t timeout] [-v]
check_real --help
check_real --version

Options:

-H, --hostname=STRING or IPADDRESS Check this server on the indicated host
-I, --IPaddress=STRING or IPADDRESS Check server at this host address
-p, --port=INTEGER Make connection on the indicated port (default: 554)
-u, --url=STRING Connect to this url
-e, --expect=STRING String to expect in first line of server response (default: RTSP/1.)
-w, --warning=INTEGER Seconds necessary to result in a warning status
-c, --critical=INTEGER Seconds necessary to result in a critical status
-t, --timeout=INTEGER Seconds before connection attempt times out (default: 10)
-v, --verbose Print extra information (command-line use only)
-h, --help Print detailed help screen
-V, --version Print version information

check_rpc

Check if a rpc service is registered and running using rpcinfo -H host -C rpc_command

Usage:

check_rpc -H host -C rpc_command [-p port] [-c program_version] [-u|-t] [-v]
check_rpc [-h | --help]
check_rpc [-V | --version]

<host> The server providing the rpc service
<rpc_command> The program name (or number).
<program_version> The version you want to check for (one or more)
Should prevent checks of unknown versions being syslogged
e.g. 2,3,6 to check v2, v3, and v6
[-u | -t] Test UDP or TCP
[-v] Verbose
[-v -v] Verbose - will print supported programs and numbers

check_sensors

This plugin checks hardware status using the lm_sensors package.

check_smtp

This plugin test the SMTP service on the specified host.

Usage:

check_smtp -H host [-e expect] [-p port] [-f from addr] [-w warn] [-c crit] [-t timeout] [-v]
check_smtp --help
check_smtp --version

Options:

-H, --hostname=STRING or IPADDRESS Check server on the indicated host
-p, --port=INTEGER Make connection on the indicated port (default: 25)
-e, --expect=STRING String to expect in first line of server response (default: 220)
-f, --from=STRING from address to include in MAIL command (default NULL, Exchange2000 requires one)
-w, --warning=INTEGER Seconds necessary to result in a warning status
-c, --critical=INTEGER Seconds necessary to result in a critical status
-t, --timeout=INTEGER Seconds before connection attempt times out (default: 10)
-v, --verbose Print extra information (command-line use only)
-h, --help Print detailed help screen
-V, --version Print version information

check_ssh

Usage:

check_ssh -t [timeout] -p [port] <host>
check_ssh -V prints version info
check_ssh -h prints more detailed help
by default, port is 22

check_swap

This plugin will check all of the swap partitions and return an error if the the avalable swap space is less than specified.

Usage:

check_swap -w <used_percentage>% -c <used_percentage>%
check_swap -w <bytes_free> -c <bytes_free>
check_swap (-V|--version)
check_swap (-h|--help)

Options:

-w, --warning=INTEGER Exit with WARNING status if less than INTEGER bytes of swap space are free
-w, --warning=PERCENT% Exit with WARNING status if more than PERCENT of swap space has been used
-c, --critical=INTEGER Exit with CRITICAL status if less than INTEGER bytes of swap space are free
-c, --critical=PERCENT% Exit with CRITCAL status if more than PERCENT of swap space has been used
-h, --help Print detailed help screen
-V, --version Print version information

check_tcp

This plugin tests TCP connections with the specified host.

Usage:

check_tcp -H host -p port [-w warn_time] [-c crit_time] [-s send] [-e expect] [-W wait] [-t to_sec] [-v]

Options:

check_time -H <host_address> [-p port] [-w variance] [-c variance] [-W connect_time] [-C connect_time] [-t timeout]
check_time (-h | --help) for detailed help
check_time (-V | --version) for version information

Options:

-H, --hostname=ADDRESS Host name argument for servers using host headers (use numeric
address if possible to bypass DNS lookup).
-w, --warning-variance=INTEGER Time difference (sec.) necessary to result in a warning status
-c, --critical-variance=INTEGER Time difference (sec.) necessary to result in a critical status
-W, --warning-connect=INTEGER Response time (sec.) necessary to result in warning status
-C, --critical-connect=INTEGER Response time (sec.) necessary to result in critical status
-t, --timeout=INTEGER Seconds before connection times out (default: 10)
-p, --port=INTEGER Port number (default: 37)
-h, --help Print detailed help screen
-V, --version Print version information

check_udp

This plugin tests an UDP connection with the specified host.

Usage:

check_udp -H <host_address> [-p port] [-w warn_time] [-c crit_time] [-e expect] [-s send] [-t to_sec] [-v]

Options:

-H, --hostname=ADDRESS Host name argument for servers using host headers (use numeric
address if possible to bypass DNS lookup).
-p, --port=INTEGER Port number
-e, --expect=STRING <optional> String to expect in first line of server response
-s, --send=STRING <optional> String to send to the server when initiating the connection
-w, --warning=INTEGER <optional> Response time to result in warning status (seconds)
-c, --critical=INTEGER <optional> Response time to result in critical status (seconds)
-t, --timeout=INTEGER <optional> Seconds before connection times out (default: 10)
-v, --verbose <optional> Show details for command-line debugging (do not use with nagios server)
-h, --help Print detailed help screen and exit
-V, --version Print version information and exit

check_users

This plugin checks the number of users currently logged in on the local system and generates an error if the number exceeds the thresholds specified.

Usage:

check_users -w <users> -c <users>

Options:

-w, --warning=INTEGER Set WARNING status if more than INTEGER users are logged in
-c, --critical=INTEGER Set CRITICAL status if more than INTEGER users are logged in
-h, --help Print detailed help screen
-V, --version Print version information

check_vsz

This plugin checks the image size of a running program and returns an error if the number is above either of the thresholds given.

Usage:

check_vsz -w <wsize> -c <csize> [-C command]
check_vsz --help
check_vsz --version

Options:

-h, --help Print detailed help
-V, --version Print version numbers and license information
-w, --warning=INTEGER Program image size necessary to cause a WARNING state
-c, --critical=INTEGER Program image size necessary to cause a CRITICAL state
-C, --command=STRING Program to search for [optional]

check_wave

Usage:

check_wave -H <host> [-w <warn>] [-c <crit>]

<warn> = Signal strength at which a warning message will be generated.
<crit> = Signal strength at which a critical message will be generated.