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[[intro]]
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== Introduction
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2018-11-16 13:16:14 +00:00
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Red Hat Single Sign-On (RH-SSO) 7.3 is based on the Keycloak project and provides security for your web applications by
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providing Web single sign-on capabilities based on popular standards such as SAML 2.0, OpenID Connect, and OAuth 2.0.
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The Red Hat Single Sign-On Server can act as a SAML or OpenID Connect-based identity provider, mediating with your
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enterprise user directory or third-party SSO provider for identity information and your applications using standards-based
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tokens.
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RH-SSO provides two operating modes: standalone server or managed domain. The standalone server operating mode represents
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running RH-SSO as a single server instance. The managed domain operating mode allows for the management of multiple
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RH-SSO instances from a single control point. The upgrade process differs depending on which operating mode has been
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implemented. Specific instructions for each mode are provided where applicable.
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The purpose of this guide is to document the steps that are required to successfully upgrade from
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Red Hat Single Sign-On 7.2 to Red Hat Single Sign-On 7.3.
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=== About Upgrades
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==== Major Upgrades
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A major upgrade or migration is required when RH-SSO is upgraded from one major release to another, for example, from
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Red Hat Single Sign-On 7.2 to Red Hat Single Sign-On 8.0. There may be breaking API changes between major releases
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that could require rewriting parts of applications or server extensions.
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==== Minor Updates
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Red Hat Single Sign-On periodically provides point releases, which are minor updates that include bug fixes, security
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fixes, and new features. If you plan to upgrade from one Red Hat Single Sign-On point release to another, for example,
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from Red Hat Single Sign-On 7.2 to Red Hat Single Sign-On 7.3, code changes should not be required for applications or
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custom server extensions as long as no private, unsupported, or tech preview APIs are used.
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==== Micro Updates
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Red Hat Single Sign-On 7 also periodically provides micro releases that contain bug and security fixes.
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Micro releases increment the minor release version by the last digit, for example from 7.2.0 to 7.2.1. These release
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do not require migration and should not impact the server configuration files. The patch management system for ZIP
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installations can also rollback the patch and server configuration.
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A micro release only contains the artifacts that have changed. For example if Red Hat Single Sign-On 7.2.1 contains changes to
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the server and the JavaScript adapter, but not the EAP adapter, only the server and JavaScript adapter are released and require
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updating.
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