ltm monitor udp
ltm monitor udp(1) BIG-IP TMSH Manual ltm monitor udp(1)
NAME
udp - Configures a User Datagram Protocol (UDP) monitor.
MODULE
ltm monitor
SYNTAX
Configure the udp component within the ltm monitor module using the syntax in the following sections.
CREATE/MODIFY
create udp [name]
modify udp [name]
options:
adaptive [enabled | disabled]
adaptive-divergence-type [relative | absolute]
adaptive-divergence-value [integer]
adaptive-limit [integer]
adaptive-sampling-timespan [integer]
app-service [[string] | none]
debug [no | yes]
defaults-from [name]
description [string]
destination [ [ ipv4 address[:port] ] | [ ipv6 address[.port] ] ]
interval [integer]
manual-resume [enabled | disabled]
recv [none | [string] ]
recv-disable [none | [string] ]
reverse [enabled | disabled]
send [none | [string] ]
time-until-up [integer]
timeout [integer]
transparent [disabled | enabled]
up-interval [integer]
edit udp [ [ [name] | [glob] | [regex] ] ... ]
options:
all-properties
non-default-properties
DISPLAY
list udp
list udp [ [ [name] | [glob] | [regex] ] ... ]
show udp [ [ [name] | [glob] | [regex] ] ... ]
show running-config udp
show running-config udp [ [ [name] | [glob] | [regex] ] ... ]
options:
all-properties
non-default-properties
one-line
partition
test-result
DELETE
delete udp [name]
Note: You cannot delete default monitors.
RUN
run udp [name] [ destination [ [ ipv4 address[:port] ] | [ ipv6 address[.port] ] ] ]
STOP
stop udp [name]
DESCRIPTION
You can use the udp component to configure a custom monitor, or you can use the default UDP monitor that the Local Traffic
Manager provides. This type of monitor verifies the UDP service by attempting to send UDP packets to a pool, pool member,
or virtual server and receiving a reply.
You can test a custom monitor configuration against a specified target destination by using the run command, and view the
results of such a test by using the show command with the test-result option.
The following user roles (in addition to the root user) have permissions to run and stop an ltm monitor test:
admin, application-editor, manager, operator, resource-admin
EXAMPLES
create udp my_udp defaults-from udp
Creates a monitor named my_udp that inherits properties from the default UDP monitor.
list udp
Displays the properties of all of the UDP monitors.
run udp my_udp destination 10.10.10.10:80
Runs a one-shot test of the custom monitor my_udp against a target node at 10.10.10.10:80.
stop udp my_udp
Cancels a one-shot test of the custom monitor my_udp in progress.
show udp my_udp test-result
Displays the result of the most recent one-shot test of the custom monitor my_udp.
OPTIONS
adaptive
Specifies whether the adaptive feature is enabled for this monitor. Not all monitors support the adaptive feature.
adaptive-divergence-type
Specifies whether the adaptive-divergence-value is relative or absolute.
adaptive-divergence-value
Specifies how far from mean latency each monitor probe is allowed to be. If adaptive-divergence-type is relative, this
value is a percentage deviation from mean (e.g. 50 would indicate the probe is allowed to exceed the mean latency by
50%.) If adaptive-divergence-type is absolute, this value is an offset from mean in milliseconds (e.g. 250 would
indicate the probe is allowed allowed to exceed the mean latency by 250 ms.) A probe that exceeds latency is counted
the same as a probe that is not received, so in the typical scenario, it will require three missed latencies in a row
to mark a pool member or node down (i.e. a 15-second interval with a 46-second timeout, would require three missed
probes before the pool member or node would be marked down.)
adaptive-limit
Specifies the hard limit, in milliseconds, which the probe is not allowed to exceed, regardless of the divergence
value. For example, if this value is 500, then the probe latency may not exceed 500 ms even if that would still fall
within the divergence value.
adaptive-sampling-timespan
Specifies the size of the sliding window, in seconds, which records probe history. For example, if this value is 300,
then a sliding window of the last five minutes' probe history will be used for calculating probe mean latency and
standard deviation.
app-service
Specifies the name of the application service to which the monitor belongs. The default value is none. Note: If the
strict-updates option is enabled on the application service that owns the object, you cannot modify or delete the
monitor. Only the application service can modify or delete the monitor.
debug
Specifies whether the monitor sends error messages and additional information to a log file created and labeled
specifically for this monitor. You can use the log information to help diagnose and troubleshoot unsuccessful health
checks. The default value is no.
The options are:
no Specifies that the system does not redirect error messages and additional information related to this monitor.
yes Specifies that the system redirects error messages and additional information to the
/var/log/monitors/--.log file.
defaults-from
Specifies the name of the monitor from which you want your custom monitor to inherit settings. The default value is
udp.
description
User defined description.
destination
Specifies the IP address and service port of the resource that is the destination of this monitor. Possible values
are:
*:* Specifies to perform a health check on the IP address and port supplied by a pool member.
*:port
Specifies to perform a health check on the server with the IP address supplied by the pool member and the port
you specify.
IP address:port
Specifies to mark a pool member up or down based on the response of the server at the IP address and port you
specify.
IP address:port (with the transparent option enabled)
Specifies to perform a health check on the server at the IP address and port you specify, route the check through
the IP address and port supplied by the pool member, and mark the pool member (the gateway) up or down
accordingly.
This option is required for the command run, unless an IP address and service port are specified in the destination
option for the specified custom monitor.
glob Displays the items that match the glob expression. See help glob for a description of glob expression syntax.
interval
Specifies, in seconds, the frequency at which the system issues the monitor check when either the resource is down or
the status of the resource is unknown. The default value is 5 seconds.
Important: F5 Networks recommends that when you configure this option and the up-interval option, whichever value is
greater be a multiple of the lesser value to allow for an even distribution of monitor checks among all monitors.
manual-resume
Specifies whether the system automatically changes the status of a resource to up at the next successful monitor
check. The default value of the manual-resume option is disabled.
Note that if you set the manual-resume option to enabled, you must manually mark the resource as up before the system
can use it for load balancing connections.
name Specifies a unique name for the component. This option is required for the commands create, delete, modify, run and
stop.
partition
Displays the administrative partition within which the component resides.
recv Specifies the text string that the monitor looks for in the returned resource. The default value is none.
recv-disable
Specifies a text string that the monitor looks for in the returned resource. If the text string is matched in the
returned resource, the corresponding node or pool member is marked session disabled. The default value is none.
The recv-disable string may be specified the same way a recv string may be specified.
If the recv-disable string is configured, the recv string must be non-empty. The recv-disable string may not be
configured if reverse mode is enabled.
regex
Displays the items that match the regular expression. The regular expression must be preceded by an at sign (@[regular
expression]) to indicate that the identifier is a regular expression. See help regex for a description of regular
expression syntax.
reverse
Specifies whether the monitor operates in reverse mode. When the monitor is in reverse mode, a successful check marks
the monitored object down instead of up. You can use the this mode only if you configure both the send and recv
options.
The default value is disabled, which specifies that the monitor does not operate in reverse mode. The enabled value
specifies that the monitor operates in reverse mode.
send Specifies the text string that the monitor sends to the target object. The default value is GET /, which retrieves a
default HTML file for a web site.
To retrieve a specific page from a web site, specify a fully-qualified path name, for example, GET
/www/company/index.html. Since the string may have special characters, the system may require that the string be
enclosed with single quotation marks.
If this value is null, then a valid connection suffices to determine that the service is up. In this case, the system
does not need the recv option and ignores the option even if it is not null. The default value is none.
test-result
Displays the result of the most recent one-shot test of the specified monitor(s), if any such test has been performed
since BIG-IP was started.
time-until-up
Specifies the amount of time, in seconds, after the first successful response before a node is marked up. A value of 0
(zero) causes a node to be marked up immediately after a valid response is received from the node. The default value
is 0 (zero).
timeout
Specifies the number of seconds the target has in which to respond to the monitor request. The default value is 16
seconds. If the target responds within the set time period, it is considered up. If the target does not respond within
the set time period, it is considered down. Also, if the target responds with a RESET packet, the system immediately
flags the target as down without waiting for the timeout interval to expire.
transparent
Specifies whether the monitor operates in transparent mode. Monitors in transparent mode can monitor pool members
through firewalls. The default value is disabled.
up-interval
Specifies, in seconds, the frequency at which the system issues the monitor check when the resource is up. The default
value is 0 (zero), which specifies that the system uses the value of the interval option whether the resource is up or
down.
Important: F5 Networks recommends that when you configure this option and the interval option, whichever value is
greater be a multiple of the lesser value to allow for an even distribution of monitor checks among all monitors.
SEE ALSO
create, delete, edit, glob, list, modify, regex, run, show, stop, tmsh
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BIG-IP 2017-08-16 ltm monitor udp(1)