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Clusters

Sticky connections are managed on Equalizer using

sticky records

that record the IP address, port and other

information for the client-server connection. When you enable sticky connections, the memory and CPU overhead

for a connection increase. This overhead increases as the sticky time period increases.

Consequently, you should use the shortest reasonable period for your application and avoid enabling sticky

connections for applications unless they need it. For most clusters, a reasonable value for the sticky time period is

600 seconds (that is, 10 minutes). If your site is extremely busy, consider using a shorter sticky time period.

With the inter-cluster sticky option, you can configure Equalizer to direct requests from a client to the same server

on any available port that has a current persistent connection

in any cluster

When Equalizer receives a client request for a Layer 4 cluster with inter-cluster sticky enabled and the client does

not have a sticky record for the cluster, then Equalizer will check other clusters that have inter-cluster sticky

enabled for a sticky record for the same client and server -- but on a different server port than the one originally

used in the client request.

If such a sticky record is found and the server IP/port in the sticky record is configured as a server in the current

cluster, then the sticky record is used to send the client request to that server IP/port. Otherwise, the client request

is load balanced across the server pool in the cluster.

In order for the inter-cluster sticky option to work:

l The two clusters must have the same cluster IP address and different ports.

l At least one server in each of the two clusters must be configured with the same IP address and different

ports.

Inter-cluster stickiness is provided for the case where you have similar services running on the same server IP on

two or more ports. Using

port ranges

for a cluster achieves essentially the same effect, without using another

cluster IP address (See "TCP Cluster Configuration Settings" on page 273). Using inter-cluster sticky is preferable

in situations where you’d like the service available on multiple cluster IPs as well as multiple ports.

To enable sticky connections for a cluster, follow these steps:

1. Log into the GUI using a login that has add/del access for the cluster (See "Logging In" on page 192)

2. In the left frame, click the name of the Layer 4 TCP or UDP cluster to be configured. The cluster’s

parameters appear in the right frame.

3. Select the Persistence tab in the right frame.

4. In the sticky time field, specify the sticky time period in seconds greater than zero.

5. To direct all requests from a particular client to the same server even if the connection is to a different virtual

cluster, check the inter-cluster sticky checkbox. You can turn on inter-cluster stickiness only if you have

enabled sticky connections by specifying a sticky time greater than zero.

6. Click the commit button.

Enabling the Once Only and Persist Options

Since HTTP 1.0, web browsers and servers have been able to negotiate persistent connections over which

multiple HTTP transactions could take place. This is useful when several TCP connections are required in order to

satisfy a single client request.

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