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Chapter 4: Configuring the High-Level Network

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user name and password for the new login, as well as which databases the

database you specify in the EAV configuration.

Running user-added EAVs

You may add your own monitors to those contained in

/user/local/lib/pingers. For running these added programs, the monitor

template external is used. The executable program is specified as the value

of the attribute run. By default, the monitor looks for the run program in

/user/local/lib/pingers. If the program resides elsewhere, a fully qualified

path name must be entered. Any command line arguments to be used with

the program are entered as args values. For example, suppose the program

my_pinger is to be run with a -q option, so that it would be entered on the

command line as follows:

my_pinger -q

This monitor might be specified as follows:

b monitor custom ’{ use external run "my_pinger" args "-q" }’

Alternatively, you may pass arguments to the external monitor as

environment variables. For example, you might want to enter this command:

/var/my_pinger /www/test_files/first_test

This could be specified in the conventional manner:

b monitor custom ’{ use external run "/var/my_pinger" args "www/test_files/first_test" }’

It could also be specified in this way:

b monitor custom ’{ use external run "/var/my_pinger" DIRECTORY "www/test_files" FILE

"first_test" }’

This defines the monitor as shown in Figure 4.70.

This frees the monitor definition from the rigidity of a strictly ordered

command line entry. The arguments are now order-independent and may be

used or ignored by the external executable.

Showing, disabling, and deleting monitors

You can show, disable, and delete monitors using the Configuration utility

or from the command line. Deleting a monitor removes it from the

/config/bigip.conf file. Disabling a monitor instance simply removes that

instance from service until it is re-enabled. Disabling a monitor (which can

be performed only at the command line) disables all instances of the

monitor. All monitor instances are enabled by default.

monitor custom {

use external

run "/var/my_pinger"

DIRECTORY "www/test_files"

FILE "first_test" }

Figure 4.70 Monitor template for an external monitor

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