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Chapter 1. Introduction
Red Hat Single Sign-On (RH-SSO) 7.3 is based on the Keycloak project and provides security for your web applications by providing Web single sign-on capabilities based on popular standards such as SAML 2.0, OpenID Connect, and OAuth 2.0. The Red Hat Single Sign-On Server can act as a SAML or OpenID Connect-based identity provider, mediating with your enterprise user directory or third-party SSO provider for identity information and your applications using standards-based tokens.
RH-SSO provides two operating modes: standalone server or managed domain. The standalone server operating mode represents running RH-SSO as a single server instance. The managed domain operating mode allows for the management of multiple RH-SSO instances from a single control point. The upgrade process differs depending on which operating mode has been implemented. Specific instructions for each mode are provided where applicable.
The purpose of this guide is to document the steps that are required to successfully upgrade from Red Hat Single Sign-On 7.2 to Red Hat Single Sign-On 7.3.
1.1. About Upgrades
1.1.1. Major Upgrades
A major upgrade or migration is required when RH-SSO is upgraded from one major release to another, for example, from Red Hat Single Sign-On 7.2 to Red Hat Single Sign-On 8.0. There may be breaking API changes between major releases that could require rewriting parts of applications or server extensions.
1.1.2. Minor Updates
Red Hat Single Sign-On periodically provides point releases, which are minor updates that include bug fixes, security fixes, and new features. If you plan to upgrade from one Red Hat Single Sign-On point release to another, for example, 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 custom server extensions as long as no private, unsupported, or tech preview APIs are used.
1.1.3. Micro Updates
Red Hat Single Sign-On 7 also periodically provides micro releases that contain bug and security fixes. Micro releases increment the minor release version by the last digit, for example from 7.2.0 to 7.2.1. These release do not require migration and should not impact the server configuration files. The patch management system for ZIP installations can also rollback the patch and server configuration.
A micro release only contains the artifacts that have changed. For example if Red Hat Single Sign-On 7.2.1 contains changes to the server and the JavaScript adapter, but not the EAP adapter, only the server and JavaScript adapter are released and require updating.
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