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1.3. Upgrading Service Mesh

To access the most current features of Red Hat OpenShift Service Mesh, upgrade to the current version, 2.5.2.

1.3.1. Understanding versioning
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Red Hat uses semantic versioning for product releases. Semantic Versioning is a 3-component number in the format of X.Y.Z, where:

  • X stands for a Major version. Major releases usually denote some sort of breaking change: architectural changes, API changes, schema changes, and similar major updates.
  • Y stands for a Minor version. Minor releases contain new features and functionality while maintaining backwards compatibility.
  • Z stands for a Patch version (also known as a z-stream release). Patch releases are used to addresses Common Vulnerabilities and Exposures (CVEs) and release bug fixes. New features and functionality are generally not released as part of a Patch release.

1.3.1.1. How versioning affects Service Mesh upgrades
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Depending on the version of the update you are making, the upgrade process is different.

  • Patch updates - Patch upgrades are managed by the Operator Lifecycle Manager (OLM); they happen automatically when you update your Operators.
  • Minor upgrades - Minor upgrades require both updating to the most recent Red Hat OpenShift Service Mesh Operator version and manually modifying the spec.version value in your ServiceMeshControlPlane resources.
  • Major upgrades - Major upgrades require both updating to the most recent Red Hat OpenShift Service Mesh Operator version and manually modifying the spec.version value in your ServiceMeshControlPlane resources. Because major upgrades can contain changes that are not backwards compatible, additional manual changes might be required.

1.3.1.2. Understanding Service Mesh versions
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In order to understand what version of Red Hat OpenShift Service Mesh you have deployed on your system, you need to understand how each of the component versions is managed.

  • Operator version - The most current Operator version is 2.5.2. The Operator version number only indicates the version of the currently installed Operator. Because the Red Hat OpenShift Service Mesh Operator supports multiple versions of the Service Mesh control plane, the version of the Operator does not determine the version of your deployed ServiceMeshControlPlane resources.

    중요

    Upgrading to the latest Operator version automatically applies patch updates, but does not automatically upgrade your Service Mesh control plane to the latest minor version.

  • ServiceMeshControlPlane version - The ServiceMeshControlPlane version determines what version of Red Hat OpenShift Service Mesh you are using. The value of the spec.version field in the ServiceMeshControlPlane resource controls the architecture and configuration settings that are used to install and deploy Red Hat OpenShift Service Mesh. When you create the Service Mesh control plane you can set the version in one of two ways:

    • To configure in the Form View, select the version from the Control Plane Version menu.
    • To configure in the YAML View, set the value for spec.version in the YAML file.

Operator Lifecycle Manager (OLM) does not manage Service Mesh control plane upgrades, so the version number for your Operator and ServiceMeshControlPlane (SMCP) may not match, unless you have manually upgraded your SMCP.

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