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Kubernetes version upgrade

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You may receive notification from Microsoft that the version of Kubernetes in Azure that your Templafy Email Signature Server cluster is running will be deprecated. Upgrading the Kubernetes version is recommended to ensure continued support from Microsoft for your Azure Kubernetes Services cluster.

 

 
  • Email Signature Server is currently validated with Kubernetes version 1.27.X [major.minor.patch]
  • This upgrade will be performed in-place on the running cluster and should not interrupt service or mail flow.
  • You should always upgrade to the latest patch version available to your region.

 

Pre-requisites

 
  • Global Administrator rights to the subscription that contains the Email Signature Server Kubernetes cluster.

 

Upgrade Kubernetes in the Azure portal

You may upgrade the Kubernetes version for the cluster at any time by navigating to the templafyemailsignatureserver Kubernetes service in the Resource group for the cluster.

 
  • Note from Microsoft

    When you upgrade a supported AKS cluster, Kubernetes minor versions cannot be skipped. All upgrades must be performed sequentially by major version number. For example, upgrades between 1.14.x -> 1.15.x or 1.15.x -> 1.16.x are allowed, however 1.14.x -> 1.16.x is not allowed.

    Skipping multiple versions can only be done when upgrading from an unsupported version back to a supported version. For example, an upgrade from an unsupported 1.10.x --> a supported 1.15.x can be completed.

 

 

  • When upgrading to Kubernetes version >=1.25.0 for the first time the Microsoft UI will warn of some possible impactful changes that have been made in that version.

    These changes, shown below, in these version of Kubernetes have no impact on our solution.

    k8s_upgrade_gt-1.25.0_warning.png

 

  1. Click the current Kubernetes version link on the Overview of the templafyemailsigantureserver Kubernetes service

    click_version.png

  2. Click the "Upgrade version" link
  3. Select the Kubernetes version to upgrade to in the right-hand pane
  4. Leave the default "Upgrade control plane + all node pools" radio button set
  5. Click [Save]

    select_new_version.png

 

 
  • If Kubernetes fails to upgrade:
    • Confirm the tags associated with the templafy-emailsignatureserver public IP address
    • Ensure your network firewall is not restricting necessary traffic

 

Additional resources

You may also review the published Microsoft support article sections for this upgrade to gain more detailed background information and to find the actions to perform the upgrade on the command line.

 

 

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