CheckHelpers

Various helper function to extend other checks.

Enable module

To enable this module and and allow using the commands you need to ass CheckHelpers = enabled to the [/modules] section in nsclient.ini:

[/modules]
CheckHelpers = enabled

Queries

A quick reference for all available queries (check commands) in the CheckHelpers module.

List of commands:

A list of all available queries (check commands)

Command	Description
check_always_critical	Run another check and regardless of its return code return CRITICAL.
check_always_ok	Run another check and regardless of its return code return OK.
check_always_warning	Run another check and regardless of its return code return WARNING.
check_and_forward	Run a check and forward the result as a passive check.
check_critical	Just return CRITICAL (anything passed along will be used as a message).
check_multi	Run more then one check and return the worst state.
check_negate	Run a check and alter the return status codes according to arguments.
check_ok	Just return OK (anything passed along will be used as a message).
check_timeout	Run a check and timeout after a given amount of time if the check has not returned.
check_version	Just return the NSClient++ version.
check_warning	Just return WARNING (anything passed along will be used as a message).
filter_perf	Run a check and filter performance data.
render_perf	Run a check and render the performance data as output message.
xform_perf	Run a check and transform the performance data in various (currently one) way.

List of command aliases:

A list of all short hand aliases for queries (check commands)

Command	Description
checkalwayscritical	Alias for: :query:check_always_critical
checkalwaysok	Alias for: :query:check_always_ok
checkalwayswarning	Alias for: :query:check_always_warning
checkcritical	Alias for: :query:check_critical
checkmultiple	Alias for: :query:check_multi
checkok	Alias for: :query:check_ok
checkversion	Alias for: :query:check_version
checkwarning	Alias for: :query:check_warning
negate	Alias for: :query:check_negate
timeout	Alias for: :query:check_timeout

check_always_critical

Run another check and regardless of its return code return CRITICAL.

• Command-line Arguments

Command-line Arguments

Option	Default Value	Description
help	N/A	Show help screen (this screen)
help-pb	N/A	Show help screen as a protocol buffer payload
show-default	N/A	Show default values for a given command
help-short	N/A	Show help screen (short format).

check_always_ok

Run another check and regardless of its return code return OK.

• Command-line Arguments

Command-line Arguments

Option	Default Value	Description
help	N/A	Show help screen (this screen)
help-pb	N/A	Show help screen as a protocol buffer payload
show-default	N/A	Show default values for a given command
help-short	N/A	Show help screen (short format).

check_always_warning

Run another check and regardless of its return code return WARNING.

• Command-line Arguments

Command-line Arguments

Option	Default Value	Description
help	N/A	Show help screen (this screen)
help-pb	N/A	Show help screen as a protocol buffer payload
show-default	N/A	Show default values for a given command
help-short	N/A	Show help screen (short format).

check_and_forward

Run a check and forward the result as a passive check.

• Command-line Arguments

Command-line Arguments

Option	Default Value	Description
help	N/A	Show help screen (this screen)
help-pb	N/A	Show help screen as a protocol buffer payload
show-default	N/A	Show default values for a given command
help-short	N/A	Show help screen (short format).
target		Commands to run (can be used multiple times)
command		Commands to run (can be used multiple times)
arguments		List of arguments (for wrapped command)

check_critical

Just return CRITICAL (anything passed along will be used as a message).

• Command-line Arguments

Command-line Arguments

Option	Default Value	Description
help	N/A	Show help screen (this screen)
help-pb	N/A	Show help screen as a protocol buffer payload
show-default	N/A	Show default values for a given command
help-short	N/A	Show help screen (short format).
message	No message	Message to return

message:

Message to return

Default Value: No message

check_multi

Run more then one check and return the worst state.

• Command-line Arguments

Command-line Arguments

Option	Default Value	Description
help	N/A	Show help screen (this screen)
help-pb	N/A	Show help screen as a protocol buffer payload
show-default	N/A	Show default values for a given command
help-short	N/A	Show help screen (short format).
command		Commands to run (can be used multiple times)
arguments		Deprecated alias for command
separator	,	Separator between messages
prefix		Message prefix
suffix		Message suffix

separator:

Separator between messages

Default Value: ,

check_negate

Run a check and alter the return status codes according to arguments.

• Command-line Arguments

Command-line Arguments

Option	Default Value	Description
help	N/A	Show help screen (this screen)
help-pb	N/A	Show help screen as a protocol buffer payload
show-default	N/A	Show default values for a given command
help-short	N/A	Show help screen (short format).
ok		The state to return instead of OK
warning		The state to return instead of WARNING
critical		The state to return instead of CRITICAL
unknown		The state to return instead of UNKNOWN
command		Wrapped command to execute
arguments		List of arguments (for wrapped command)

check_ok

Just return OK (anything passed along will be used as a message).

• Command-line Arguments

Command-line Arguments

Option	Default Value	Description
help	N/A	Show help screen (this screen)
help-pb	N/A	Show help screen as a protocol buffer payload
show-default	N/A	Show default values for a given command
help-short	N/A	Show help screen (short format).
message	No message	Message to return

message:

Message to return

Default Value: No message

check_timeout

Run a check and timeout after a given amount of time if the check has not returned.

• Command-line Arguments

Command-line Arguments

Option	Default Value	Description
help	N/A	Show help screen (this screen)
help-pb	N/A	Show help screen as a protocol buffer payload
show-default	N/A	Show default values for a given command
help-short	N/A	Show help screen (short format).
timeout		The timeout value
command		Wrapped command to execute
arguments		List of arguments (for wrapped command)
return		The return status

check_version

Just return the NSClient++ version.

• Command-line Arguments

Command-line Arguments

Option	Default Value	Description
help	N/A	Show help screen (this screen)
help-pb	N/A	Show help screen as a protocol buffer payload
show-default	N/A	Show default values for a given command
help-short	N/A	Show help screen (short format).

check_warning

Just return WARNING (anything passed along will be used as a message).

• Command-line Arguments

Command-line Arguments

Option	Default Value	Description
help	N/A	Show help screen (this screen)
help-pb	N/A	Show help screen as a protocol buffer payload
show-default	N/A	Show default values for a given command
help-short	N/A	Show help screen (short format).
message	No message	Message to return

message:

Message to return

Default Value: No message

filter_perf

Run a check and filter performance data.

• Command-line Arguments

Command-line Arguments

Option	Default Value	Description
help	N/A	Show help screen (this screen)
help-pb	N/A	Show help screen as a protocol buffer payload
show-default	N/A	Show default values for a given command
help-short	N/A	Show help screen (short format).
sort	none	The sort order to use: none, normal or reversed
limit	0	The maximum number of items to return (0 returns all items)
command		Wrapped command to execute
arguments		List of arguments (for wrapped command)

sort:

The sort order to use: none, normal or reversed

Default Value: none

limit:

The maximum number of items to return (0 returns all items)

Default Value: 0

render_perf

Run a check and render the performance data as output message.

• Command-line Arguments
• Filter keywords

Command-line Arguments

Option	Default Value	Description
filter		Filter which marks interesting items.
warning		Filter which marks items which generates a warning state.
warn		Short alias for warning
critical		Filter which marks items which generates a critical state.
crit		Short alias for critical.
ok		Filter which marks items which generates an ok state.
debug	N/A	Show debugging information in the log
show-all	N/A	Show details for all matches regardless of status (normally details are only showed for warnings and criticals).
empty-state	unknown	Return status to use when nothing matched filter.
perf-config		Performance data generation configuration
escape-html	N/A	Escape any < and > characters to prevent HTML encoding
help	N/A	Show help screen (this screen)
help-pb	N/A	Show help screen as a protocol buffer payload
show-default	N/A	Show default values for a given command
help-short	N/A	Show help screen (short format).
top-syntax	%(status): %(message) %(list)	Top level syntax.
ok-syntax		ok syntax.
empty-syntax		Empty syntax.
detail-syntax	%(key) %(value) %(unit) %(warn) %(crit) %(min) %(max)
Detail level syntax.
perf-syntax	%(key)	Performance alias syntax.
command		Wrapped command to execute
arguments		List of arguments (for wrapped command)
remove-perf	N/A	List of arguments (for wrapped command)

filter:

Filter which marks interesting items. Interesting items are items which will be included in the check. They do not denote warning or critical state instead it defines which items are relevant and you can remove unwanted items.

warning:

Filter which marks items which generates a warning state. If anything matches this filter the return status will be escalated to warning.

critical:

Filter which marks items which generates a critical state. If anything matches this filter the return status will be escalated to critical.

ok:

Filter which marks items which generates an ok state. If anything matches this any previous state for this item will be reset to ok.

empty-state:

Return status to use when nothing matched filter. If no filter is specified this will never happen unless the file is empty.

Default Value: unknown

perf-config:

Performance data generation configuration TODO: obj ( key: value; key: value) obj (key:valuer;key:value)

top-syntax:

Top level syntax. Used to format the message to return can include text as well as special keywords which will include information from the checks. To add a keyword to the message you can use two syntaxes either ${keyword} or %(keyword) (there is no difference between them apart from ${} can be difficult to escape on linux).

Default Value: %(status): %(message) %(list)

ok-syntax:

ok syntax. DEPRECATED! This is the syntax for when an ok result is returned. This value will not be used if your syntax contains %(list) or %(count).

empty-syntax:

Empty syntax. DEPRECATED! This is the syntax for when nothing matches the filter.

detail-syntax:

Detail level syntax. Used to format each resulting item in the message. %(list) will be replaced with all the items formated by this syntax string in the top-syntax. To add a keyword to the message you can use two syntaxes either ${keyword} or %(keyword) (there is no difference between them apart from ${} can be difficult to escape on linux).

Default Value: %(key) %(value) %(unit) %(warn) %(crit) %(min) %(max)

perf-syntax:

Performance alias syntax. This is the syntax for the base names of the performance data.

Default Value: %(key)

Filter keywords

Option	Description
count	Number of items matching the filter. Common option for all checks.
crit	Major version number
crit_count	Number of items matched the critical criteria. Common option for all checks.
crit_list	A list of all items which matched the critical criteria. Common option for all checks.
detail_list	A special list with critical, then warning and finally ok. Common option for all checks.
key	Major version number
list	A list of all items which matched the filter. Common option for all checks.
max	Major version number
message	Major version number
min	Major version number
ok_count	Number of items matched the ok criteria. Common option for all checks.
ok_list	A list of all items which matched the ok criteria. Common option for all checks.
problem_count	Number of items matched either warning or critical criteria. Common option for all checks.
problem_list	A list of all items which matched either the critical or the warning criteria. Common option for all checks.
status	The returned status (OK/WARN/CRIT/UNKNOWN). Common option for all checks.
total	Total number of items. Common option for all checks.
unit	Major version number
value	Major version number
warn	Major version number
warn_count	Number of items matched the warning criteria. Common option for all checks.
warn_list	A list of all items which matched the warning criteria. Common option for all checks.

xform_perf

Run a check and transform the performance data in various (currently one) way.

• Command-line Arguments

Command-line Arguments

Option	Default Value	Description
help	N/A	Show help screen (this screen)
help-pb	N/A	Show help screen as a protocol buffer payload
show-default	N/A	Show default values for a given command
help-short	N/A	Show help screen (short format).
command		Wrapped command to execute
arguments		List of arguments (for wrapped command)
mode		Transformation mode: extract to fetch data or minmax to add missing min/max
field		Field to work with (value, warn, crit, max, min)
replace		Replace expression for the alias