gtm pool srv
gtm pool srv(1) BIG-IP TMSH Manual gtm pool srv(1)
NAME
srv - Configures SRV load balancing pools for the Global Traffic
Manager(tm).
MODULE
gtm pool
SYNTAX
Modify the Global Traffic Manager pool srv component within the gtm
module using the syntax shown in the following sections.
CREATE/MODIFY
create pool srv [name]
modify pool srv [name]
options:
alternate-mode [drop-packet | global-availability
| none | packet-rate | ratio | return-to-dns | round-robin
| static-persistence | topology | virtual-server-capacity
| virtual-server-score]
app-service [[string] | none]
description [string]
[disabled | enabled]
dynamic ratio [disabled | enabled]
fallback-mode [completion-rate | cpu | drop-packet
| fewest-hops | global-availability | kilobytes-per-second
| least-connections | lowest-round-trip-time | none
| packet-rate | quality-of-service | ratio | return-to-dns
| round-robin | static-persistence | topology
| virtual-server-capacity | virtual-server-score]
load-balancing-mode [completion-rate | cpu | drop-packet
| fewest-hops | global-availability
| kilobytes-per-second | least-connections
| lowest-round-trip-time | packet-rate | quality-of-service
| ratio | return-to-dns | round-robin | static-persistence
| topology | virtual-server-capacity | virtual-server-score]
manual-resume [disabled | enabled]
max-answers-returned [integer]
members none
members
[ add | delete | modify | replace-all-with ] {
[member-dname] {
options:
app-service [[string] | none]
description [string]
[disabled | enabled]
member-order [integer]
port [integer]
priority [integer]
ratio [integer]
weight [integer]
}...
}
metadata none
metadata
[add | delete | modify | replace-all-with] {
[metadata_name ... ] {
app-service [[string] | none]
persist [ true | false ]
value [ "value content" ]
}
}
qos-hit-ratio [integer]
qos-hops [integer]
qos-kilobytes-second [integer]
qos-lcs [integer]
qos-packet-rate [integer]
qos-rtt [integer]
qos-topology [integer]
qos-vs-capacity [integer]
qos-vs-score [integer]
ttl [integer]
verify-member-availability [disabled | enabled]
edit pool srv [ [ [name] | [glob] | [regex] ] ... ]
options:
all-properties
non-default-properties
reset-stats pool srv
reset-stats pool srv [ [ [name] | [glob] | [regex] ] ... ]
DISPLAY
list pool srv
list pool srv [ [ [name] | [glob] | [regex] ] ... ]
show running-config pool srv
show running-config pool srv [ [ [name] | [glob] | [regex] ] ... ]
options:
all-properties
non-default-properties
members member-dname
one-line
partition
show pool srv
show pool srv [name]
options:
(default | exa | gig | kil | meg | peta | raw | tera | yotta | zetta)
detail
field-fmt
DELETE
delete pool srv [name]
Note: You must remove all references to a pool before you can delete
the pool.
DESCRIPTION
You can use the pool component to configure the SRV pool definitions on
the Global Traffic Manager. You use a pool to group member names
together to use a common load balancing algorithm.
EXAMPLES
create pool srv mypool members add {
imap.mydomain.com {
port 143
priority 20
}
}
Creates a Global Traffic Manager SRV pool with one member
imap.mydomain.com with port 143 and priority 20 using the Round Robin
load balancing method.
delete pool srv my_pool
Deletes the pool my_pool.
show pool srv
Displays statistics for all SRV pools.
list pool srv my_pool
Displays settings of pool my_pool.
OPTIONS
alternate-mode
Specifies the load balancing mode that the system uses to load
balance name resolution requests among the members of this pool,
if the preferred method is unsuccessful in picking a pool. You set
the preferred mode using the load-balancing-mode option. The
default value is round-robin.
The options are:
drop-packet
Specifies that the Global Traffic Manager does nothing with
the packet, and simply drops the request.
global-availability
Specifies that the Global Traffic Manager distributes
connection requests to virtual servers included in the pool
in the order in which they are listed.
none Specifies that the system skips the alternate load balancing
mode and immediately tries the load balancing mode specified
in the fallback-mode option.
Note that if the value of the fallback-mode option is none,
and you have multiple pools configured, the Global Traffic
Manager uses the next available pool.
packet-rate
Specifies that the Global Traffic Manager assigns connection
requests to the virtual server that is currently processing
the fewest number of packets per second.
ratio
Specifies that the Global Traffic Manager distributes
connection requests among a pool of virtual servers using a
weighted Round Robin load balancing method.
return-to-dns
Specifies that the Global Traffic Manager immediately returns
connection requests to the Local DNS for resolution.
round-robin
Specifies that the Global Traffic Manager distributes
connection requests in a circular and sequential pattern
among the virtual servers in a pool.
static-persistence
Specifies that the Global Traffic Manager consistently maps
an LDNS IP address to the same available virtual server for
the duration of a session.
topology
Specifies that the Global Traffic Manager uses proximity-
based load balancing to distribute connection requests.
virtual-server-capacity
Specifies that the Global Traffic Manager assigns connection
requests to virtual servers based on a user-defined ranking
system.
virtual-server-score
Specifies that the Global Traffic Manager assigns connection
requests to virtual servers based on a user-defined ranking
system.
app-service
Specifies the name of the application service to which this pool
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 this pool. Only the application
service can modify or delete this pool.
description
User defined description.
[disabled | enabled]
Specifies whether this pool is available for load balancing. The
default value is enabled.
dynamic-ratio
Enables or disables a dynamic ratio load balancing algorithm for
this pool. This option is applicable only when you also configure
the load-balancing-mode option for the pool with one of these
dynamic load balancing modes: completion-rate, fewest-hops,
kilobytes-per-second, least-connections, lowest-round-trip-times,
quality-of-service, virtual-server-capacity, or virtual-server-
score.
When this option is disabled (the default), the system uses only
the server or virtual server with the best metrics, or highest
quality of service (QoS) score, for load balancing. When dynamic-
ratio is enabled, the system treats QoS scores as ratios, and it
uses each server or virtual server in proportion to the ratio
determined by the QoS calculation.
fallback-mode
Specifies the load balancing mode that the system uses to load
balance name resolution requests among the members of this pool,
if the preferred and alternate modes are unsuccessful in picking a
pool. You set the preferred mode using the load-balancing-mode
option, and the alternate mode using the alternate-mode option.
The default value is return-to-dns.
The options are:
completion-rate
Specifies that the Global Traffic Manager selects the virtual
server that currently maintains the least number of dropped
or timed-out packets during a transaction between a data
center and the client LDNS.
cpu Specifies that the Global Traffic Manager selects the virtual
server that currently has the most CPU processing time
available to handle name resolution requests.
drop-packet
Specifies that the Global Traffic Manager does nothing with
the packet, and simply drops the request.
fewest-hops
Specifies that the Global Traffic Manager distributes
connection requests to the virtual server in the data center
that has the fewest router hops from the Local DNS.
global-availability
Specifies that the Global Traffic Manager distributes
connection requests to virtual servers included in the pool
in the order in which they are listed.
kilobytes-per-second
Specifies that the Global Traffic Manager distributes
connection requests to the virtual server that is currently
processing the fewest number of kilobytes per second.
least-connections
Specifies that the Global Traffic Manager distributes
connection requests to the virtual server on the Local
Traffic Manager that currently hosts the fewest connections.
lowest-round-trip-time
Specifies that the Global Traffic Manager distributes
connection requests to the virtual server with the fastest
measured round trip time between a data center and a client
LDNS.
none Specifies that there is no fallback mode. If the system
cannot use the preferred or alternate load balancing modes,
it uses the next pool to resolve the request. If there are no
more pools available, the result is the same as when the
value for the fallback-mode option is return-to-dns.
packet-rate
Specifies that the Global Traffic Manager assigns connection
requests to the virtual server that is currently processing
the fewest number of packets per second.
quality-of-service
Specifies that the Global Traffic Manager distributes
connection requests using current performance information to
calculate an overall score for each virtual server, and then
distributes connections to the virtual servers based on these
scores.
ratio
Specifies that the Global Traffic Manager distributes
connection requests among a pool of virtual servers using a
weighted Round Robin load balancing method.
return-to-dns
Specifies that the Global Traffic Manager immediately returns
connection requests to the Local DNS for resolution.
round-robin
Specifies that the Global Traffic Manager distributes
connection requests in a circular and sequential pattern
among the virtual servers in a pool.
static-persistence
Specifies that the Global Traffic Manager consistently maps
an LDNS IP address to the same available virtual server for
the duration of a session.
topology
Specifies that the Global Traffic Manager uses proximity-
based load balancing to distribute connection requests.
virtual-server-capacity
Specifies that the Global Traffic Manager distributes
connection requests by creating a list of the virtual
servers, weighted by capacity, then picks one of the virtual
servers from the list. The virtual servers with the greatest
capacity are picked most often, but over time all virtual
servers are returned.
virtual-server-score
Specifies that the Global Traffic Manager assigns connection
requests to virtual servers based on a user-defined ranking
system.
glob Displays the items that match the glob expression. See help glob
for a description of glob expression syntax.
load-balancing-mode
Specifies the preferred load balancing mode that the system uses
to load balance name resolution requests among the members of this
pool. The default value is round-robin.
The options are:
completion-rate
Specifies that the Global Traffic Manager selects the virtual
server that currently maintains the least number of dropped
or timed-out packets during a transaction between a data
center and the client LDNS.
cpu Specifies that the Global Traffic Manager selects the virtual
server that currently has the most CPU processing time
available to handle name resolution requests.
drop-packet
Specifies that the Global Traffic Manager does nothing with
the packet, and simply drops the request.
fewest-hops
Specifies that the Global Traffic Manager distributes
connection requests to the virtual server in the data center
that has the fewest router hops from the Local DNS.
global-availability
Specifies that the Global Traffic Manager distributes
connection requests to virtual servers included in the pool
in the order in which they are listed.
kilobytes-per-second
Specifies that the Global Traffic Manager distributes
connection requests to the virtual server that is currently
processing the fewest number of kilobytes per second.
least-connections
Specifies that the Global Traffic Manager distributes
connection requests to the virtual server on the Local
Traffic Manager that currently hosts the fewest connections.
lowest-round-trip-time
Specifies that the Global Traffic Manager distributes
connection requests to the virtual server with the fastest
measured round trip time between a data center and a client
LDNS.
packet-rate
Specifies that the Global Traffic Manager assigns connection
requests to the virtual server that is currently processing
the fewest number of packets per second.
quality-of-service
Specifies that the Global Traffic Manager distributes
connection requests using current performance information to
calculate an overall score for each virtual server, and then
distributes connections to the virtual servers based on these
scores.
ratio
Specifies that the Global Traffic Manager distributes
connection requests among a pool of virtual servers using a
weighted Round Robin load balancing method.
return-to-dns
Specifies that the Global Traffic Manager immediately returns
connection requests to the Local DNS for resolution.
round-robin
Specifies that the Global Traffic Manager distributes
connection requests in a circular and sequential pattern
among the virtual servers in a pool.
static-persistence
Specifies that the Global Traffic Manager consistently maps
an LDNS IP address to the same available virtual server for
the duration of a session.
topology
Specifies that the Global Traffic Manager uses proximity-
based load balancing to distribute connection requests.
virtual-server-capacity
Specifies that the Global Traffic Manager distributes
connection requests by creating a list of the virtual
servers, weighted by capacity, then picks one of the virtual
servers from the list. The virtual servers with the greatest
capacity are picked most often, but over time all virtual
servers are returned.
virtual-server-score
Specifies that the Global Traffic Manager assigns connection
requests to virtual servers based on a user-defined ranking
system.
manual-resume
Enables or disables the manual resume function for this pool. If
you leave this option disabled (the default), then a member of
this pool automatically becomes available for load balancing when
its status changes from down to up. When the manual-resume option
is enabled, if the status of a member of this pool changes from up
to down, the pool member remains disabled indefinitely until you
manually re-enable it.
max-answers-returned
Specifies the maximum number of available virtual servers that the
system lists in a response. The default value is 1.
members
Specifies the member-dname of the pool members. The default value
is none.
You can also use the following options with pool members:
app-service
Specifies the name of the application service to which this
pool member 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 this pool
member. Only the application service can modify or delete
this pool member.
description
User defined description.
[enabled | disabled]
Specifies whether this pool member is available for load
balancing. The default value is enabled.
member-order
Specifies the order number of the pool member. The system
uses this number with load balancing methods that involve
prioritizing pool members, such as the Ratio load balancing
method.
port Specifies the response resource record's port RDATA field
value when this member is picked.
priority
Specifies the response resource record's priority RDATA field
value when this member is picked. The default value is 10.
ratio
Specifies the relative weight of the pool member for load
balancing purposes.
weight
Specifies the response resource record's weight RDATA field
value when this member is picked. The default value is 10.
member-dname
Displays the member's DNAME.
metadata
Associates user defined data, each of which has name and value
pair and persistence. Persistent(default) means the data will be
saved into config file.
name Specifies a unique name for the component. This option is required
for the commands create and modify.
partition
Displays the partition within which the component resides.
qos-hit-ratio
Assigns a weight to the Hit Ratio performance factor for the
Quality of Service dynamic load balancing mode. The default value
is 5.
qos-hops
Assigns a weight to the Hops performance factor when the value of
the either the load-balancing-mode or fallback-mode options is
quality-of-service. The default value is 0 (zero).
qos-kilobytes-second
Assigns a weight to the Kilobytes per Second performance factor
when the value of the either the load-balancing-mode or fallback-
mode options is quality-of-service. The default value is 3.
qos-lcs
Assigns a weight to the Link Capacity performance factor when the
value of the either the load-balancing-mode or fallback-mode
options is quality-of-service. The default value is 30.
qos-packet-rate
Assigns a weight to the Packet Rate performance factor when the
value of the either the load-balancing-mode or fallback-mode
options is quality-of-service. The default value is 1.
qos-rtt
Assigns a weight to the Round Trip Time performance factor when
the value of the either the load-balancing-mode or fallback-mode
options is quality-of-service. The default value is 50.
qos-topology
Assigns a weight to the Topology performance factor when the value
of the either the load-balancing-mode or fallback-mode options is
quality-of-service. The default value is 0 (zero).
qos-vs-capacity
Assigns a weight to the Virtual Server performance factor when the
value of the either the load-balancing-mode or fallback-mode
options is quality-of-service. The default value is 0 (zero).
qos-vs-score
Assigns a weight to the Virtual Server Score performance factor
when the value of the either the load-balancing-mode or fallback-
mode options is quality-of-service. The default value is 0 (zero).
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.
ttl Specifies the number of seconds that the answer, once found, is
valid. Once the time-to-live (TTL) expires, the client has to
request name resolution again. The valid values are 0 through
4294967295; the default value is 30.
verify-member-availability
Specifies that the system verifies the availability of the members
before sending a connection to those resources. The default value
is enabled.
SEE ALSO
cli admin-partitions, create, delete, edit, glob, list, ltm virtual,
modify, regex, reset-stats, show, tmsh
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F5 Networks and BIG-IP (c) Copyright 2008-2016. All rights reserved.
BIG-IP 2016-04-28 gtm pool srv(1)