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42 lines
2.5 KiB
XML
42 lines
2.5 KiB
XML
<?xml version='1.0' encoding='utf-8' ?>
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<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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<!ENTITY % BOOK_ENTITIES SYSTEM "cloudstack.ent">
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%BOOK_ENTITIES;
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]>
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<!-- Licensed to the Apache Software Foundation (ASF) under one
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or more contributor license agreements. See the NOTICE file
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distributed with this work for additional information
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regarding copyright ownership. The ASF licenses this file
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to you under the Apache License, Version 2.0 (the
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"License"); you may not use this file except in compliance
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with the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing,
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software distributed under the License is distributed on an
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"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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KIND, either express or implied. See the License for the
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specific language governing permissions and limitations
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under the License.
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-->
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<section id="sticky-session-policies-for-lb-rules">
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<title>Sticky Session Policies for Load Balancer Rules</title>
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<para>Sticky sessions are used in Web-based applications to ensure continued availability of
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information across the multiple requests in a user's session. For example, if a shopper is
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filling a cart, you need to remember what has been purchased so far. The concept of "stickiness"
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is also referred to as persistence or maintaining state.</para>
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<para>Any load balancer rule defined in &PRODUCT; can have a stickiness policy. The policy
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consists of a name, stickiness method, and parameters. The parameters are name-value pairs or
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flags, which are defined by the load balancer vendor. The stickiness method could be load
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balancer-generated cookie, application-generated cookie, or source-based. In the source-based
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method, the source IP address is used to identify the user and locate the user’s stored data. In
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the other methods, cookies are used. The cookie generated by the load balancer or application is
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included in request and response URLs to create persistence. The cookie name can be specified by
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the administrator or automatically generated. A variety of options are provided to control the
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exact behavior of cookies, such as how they are generated and whether they are cached.</para>
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<para>For the most up to date list of available stickiness methods, see the &PRODUCT; UI or call
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listNetworks and check the SupportedStickinessMethods capability.</para>
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</section>
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