Coyote Point Systems Equalizer Especificaciones descargar pdf (Pagina 341)

The procedure below shows you how to create a match rule that selectively disables the cluster Spoof option

based on the client IP address of an incoming connection. It is assumed that the cluster for which the match rule is

created has Spoof

enabled

on the cluster Configuration screen (tab), and that the cluster works properly for

clients on subnets other than the subnet to which the server pools in the cluster are connected.

1. Right-click the name of the cluster for which you want to implement selective SNAT, and select Add

Match Rule.

2. On the Add New Match Rule form:

a. Type in a Match Name or accept the default.

b. Select the Next Match Rule from the drop down list to place the new match rule in the

desired order on the cluster.

c. Click on Commit.

The new match rule is created and its Configuration Screen (tab) is opened.

3. Leave any() in the expression field.

4. In the Expression Editor:

a. Drag and drop the client_ip function from the Functions pane to the Expression

Workbench.

b. Specify a simple IP address (e.g., “192.168.0.240”), or an IP address in Classless Inter-

Domain Routing (CIDR) notation (e.g., “192.168.0.0/24”) to specify an entire subnet in the

client_ip function. Click on the Continue button when finished.

The Expression field should now contain the client_ip function with the ip argument you specified above.

5. Uncheck both the Spoof checkbox and the Disable checkbox on the Configuration Screen (tab).

6. Click on Commit.

Clients whose IP addresses are selected by the new match rule should now be able to connect successfully to the

cluster IP. Right-click the name of the match rule in the left frame; the Processed counter in the popup menu

should increase as clients are selected by the match rule. Select Match Rule Plots from the popup menu to

display a history of the number of connections processed by the match rule.

Server Selection Based on Content Type Using Match Rules

In this example, assume a configuration that has dedicated one or more server pools to return only image files

(

.gif

.jpg

, etc.), while the remainder of the server pools return all the other content for client requests.

We want to direct all requests for images to a particular server pool, and balance the remainder of requests across

the other server pools in the cluster. The image server pool is connected to a common storage device that contains

the images. The remaining server pools are all dedicated to serving particular content for different web sites. For

this example, we assume that a cluster has already been defined.

We want to maintain persistent connections for the web site servers, assuming that some of the websites may

need to maintain sessions for applications such as shopping carts, email, etc. Persistent connections are not

necessary for the image servers, since they access the images from common storage and have no need to

maintain client sessions, so there is no need to incur the performance impact of maintaining session information.

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