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Astra Trident
21.07

Upgrade Astra Trident

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Astra Trident follows a quarterly release cadence, delivering four major releases every calendar year. Each new release builds on top of the previous releases, providing new features and performance enhancements as well as bug fixes and improvements. You are encouraged to upgrade at least once a year to take advantage of the new features in Astra Trident.

Note Upgrading to a release that is five releases ahead will require you to perform a multistep upgrade.

Determine the version to upgrade to

  • You can upgrade to the YY.MM release from the YY-1.MM release and any in-between releases. For example, you can perform a direct upgrade to 20.07 from 19.07 and later (including dot releases, such as 19.07.1).

  • If you have an earlier release, you should perform a multistep upgrade. This requires you to first upgrade to the most recent release that fits your four-release window. For example, if you are running 18.07 and want to upgrade to the 20.07 release, then follow the multistep upgrade process as given below:

    • First upgrade from 18.07 to 19.07. See the documentation of the respective release to obtain specific instructions for upgrading.

    • Then upgrade from 19.07 to 20.07.

Important All upgrades for versions 19.04 and earlier require the migration of Astra Trident's metadata from it's own etcd to CRD objects. Ensure that you check the documentation of the release to understand how the upgrade works.
Warning When upgrading, it is important you provide parameter.fsType in StorageClasses used by Astra Trident. You can delete and re-create StorageClasses without disrupting pre-existing volumes. This is a requirement for enforcing security contexts for SAN volumes. The sample input directory contains examples, such as storage-class-basic.yaml.templ and storage-class-bronze-default.yaml.
For more information, see Known Issues.

Which upgrade path should I choose?

You can upgrade by using one of the following paths:

  • Using the Trident operator.

  • Using tridentctl.

Warning CSI Volume Snapshots is now a feature that is GA, beginning with Kubernetes 1.20. When upgrading Astra Trident, all previous alpha snapshot CRs and CRDs (Volume Snapshot Classes, Volume Snapshots and Volume Snapshot Contents) must be removed before the upgrade is performed. Refer to this blog to understand the steps involved in migrating alpha snapshots to the beta/GA spec.

You can use the Trident operator to upgrade if the following conditions are met:

  • You are running CSI Trident (19.07 and later).

  • You have a CRD-based Trident release (19.07 and later).

  • You are not performing a customized install (using custom YAMLs).

Warning Do not use the operator to upgrade Trident if you are using an etcd-based Trident release (19.04 or earlier).

If you do not want to use the operator or you have a customized install that cannot be supported by the operator, you can upgrade by using tridentctl. This is the preferred method of upgrades for Trident releases 19.04 and earlier.

Changes to the operator

The 21.01 release of Astra Trident introduces some key architectural changes to the operator, namely the following:

  • The operator is now cluster-scoped. Previous instances of the Trident operator (versions 20.04 through 20.10) were namespace-scoped. An operator that is cluster-scoped is advantageous for the following reasons:

    • Resource accountability: The operator now manages resources associated with an Astra Trident installation at the cluster level. As part of installing Astra Trident, the operator creates and maintains several resources by using ownerReferences. Maintaining ownerReferences on cluster-scoped resources can throw up errors on certain Kubernetes distributors such as OpenShift. This is mitigated with a cluster-scoped operator. For auto-healing and patching Trident resources, this is an essential requirement.

    • Cleaning up during uninstallation: A complete removal of Astra Trident would require all associated resources to be deleted. A namespace-scoped operator might experience issues with the removal of cluster-scoped resources (such as the clusterRole, ClusterRoleBinding and PodSecurityPolicy) and lead to an incomplete clean-up. A cluster-scoped operator eliminates this issue. Users can completely uninstall Astra Trident and install afresh if needed.

  • TridentProvisioner is now replaced with TridentOrchestrator as the Custom Resource used to install and manage Astra Trident. In addition, a new field is introduced to the TridentOrchestrator spec. Users can specify that the namespace Trident must be installed/upgraded from using the spec.namespace field. You can take a look at an example here.

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