Coyote Point Systems E350GX, Руководство по установке и администрированию

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Configuring Smart Events
Equalizer Installation and Administration Guide 169
Logging a Message When Server Count is Low
Let’s say we want to create a Smart Event for a cluster that prints a message to the Equalizer log any time there are
fewer than 2 servers active in the cluster. To create this event:
1. Right-click on a cluster name in the left frame and select
Add Event
from the popup menu.
2. Type a
Name
for the event (or accept the default) and click the Next icon (
>
). This opens the
Event Trigger
expression editor:
3. In the
operators
field, click on the following controls:
a.
active_servers
b. the ‘less than’ operator (
<
).
c.
numeric
The
expression workbench
field should now look like this:
4. In the
expression workbench
field, click on the drop-down arrow shown in the blank parameter. Type ‘
2
’ into
the
numeric value
text box and then click
accept
.
5. At the top of the
Add New Event
popup window, click the Next icon (
>
). This displays the
Event Action
editor.
6. In the
functions
field, click on
log
.
7. In the
expression workbench
field, click on the drop-down arrow next to
log(
““
)
. Type the following into the
message text box that appears:
There are fewer than two servers active.
When you finish typing the message, click
accept
. The
expression workbench
field should now look like this:
8. At the top of the
Add New Event
popup window, click the Next icon (
>
).
9. A confirmation screen appears that summarizes the new event. Click
commit
to save the new event. The new
event is now active, and will be evaluated at the next
smart timer
interval. Equalizer opens the event’s
configuration tabs so you can inspect the event definition and make further changes, if necessary.