Coyote Point Systems E350GX, Руководство по установке и администрированию

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Automatic Cluster Responders
Equalizer Installation and Administration Guide 159
Responder -- thus, if all the servers in the
Default
match rule are down, Equalizer drops the client connection to the
cluster.
In order to change the default behavior and supply a “sorry page” or redirect for a cluster, you need to add a new
match rule that:
• matches any incoming request
• selects all servers in the cluster
• has a
Sorry Server
Responder selected
For example, let’s say you have two Responders defined as in Figure 30, and there is an existing cluster that you
would like to redirect to
http://www.example.com
when no servers in the cluster are available. To accomplish
this, we need to create a new Responder and then add a match rule to the cluster:
1. Right-click on
Responders
in the left frame and select
Add New Responder
from the popup menu.
2. Type
SorryExample
into the
Name
field and select
Sorry Server
.
3. Type the HTML content for the page to display into the text box that appears, as shown in the following
example:
4. Click
commit
to save the new Responder.
5. Right-click on the name of the cluster for which you want to display the sorry page in the left frame and select
Add Match Rule
from the menu.
6. If more than one match rule already exists in the cluster, select the appropriate position for the rule from the
immediately before drop-down box.
7. Specify a
Name
for the match rule or accept the default.
8. Leave the match rule
expression
set to the default [
any()
] -- the rule will match all incoming requests.
9. Select all the servers in the
servers
field; the Responder will only be used if none of these servers is available .
10. Select
SorryExample
in the
response
drop-down box.
11. Click
commit
to save the match rule.
Creating a Match Rule to Redirect All Traffic for a Specific URL
Another common cluster configuration requirement is to be able to automatically redirect all traffic that uses a
specific URL. To do this, you need to add a new match rule that: