You can upgrade the existing Workload Kubernetes Cluster version to the latest versions of Kubernetes supported in the current version of the VMware Telco Cloud Automation.

Note: When you upgrade a workload cluster to the latest version, the certificate renewal of the cluster is automatically enabled and the number of days defaults to 90.

The following table lists the Kubernetes upgrade compatibility and upgrade paths for the Workload cluster when upgrading from VMware Telco Cloud Automation.

Current Kubernetes Version/Target Kubernetes Version TKG 2.5.0/v1.26.11 TKG 2.5.0/v1.27.8 TKG 2.5.0/v1.28.4
TKG 2.1.1/v1.24.10

1. Upgrade Management Cluster

TKG 2.1.1->TKG 2.2.0->TKG 2.3.1

2. Upgrade Workload Cluster

v1.24.10->v1.25.13->v1.26.8

3. Upgrade Management Cluster

TKG 2.3.1->TKG 2.4.1->TKG 2.5.0

4. Upgrade Workload Cluster

v1.26.8->v1.26.11

1. Upgrade Management Cluster

TKG 2.1.1->TKG 2.2.0->TKG 2.3.1

2. Upgrade Workload Cluster

v1.24.10->v1.25.13->v1.26.8

3. Upgrade Management Cluster

TKG 2.3.1->TKG 2.4.1->TKG 2.5.0

4. Upgrade Workload Cluster

v1.26.8->v1.27.8

1. Upgrade Management Cluster

TKG 2.1.1->TKG 2.2.0->TKG 2.3.1

2. Upgrade Workload Cluster

v1.24.10->v1.25.13->v1.26.8

3. Upgrade Management Cluster

TKG 2.3.1->TKG 2.4.1->TKG 2.5.0

4. Upgrade Workload Cluster

v1.26.8->v1.27.8->v1.28.4
TKG 2.3.1/v1.24.17

1. Upgrade Workload Cluster

v1.24.17->v1.25.13->v1.26.8

2. Upgrade Management Cluster

TKG 2.3.1->TKG 2.4.1->TKG 2.5.0

3. Upgrade Workload Cluster

v1.26.8->v1.26.11

1. Upgrade Workload Cluster

v1.24.17->v1.25.13->v1.26.8

2. Upgrade Management Cluster

TKG 2.3.1->TKG 2.4.1->TKG 2.5.0

3. Upgrade Workload Cluster

v1.26.8->v1.27.8

1. Upgrade Workload Cluster

v1.24.17->v1.25.13->v1.26.8

2. Upgrade Management Cluster

TKG 2.3.1->TKG 2.4.1->TKG 2.5.0

3. Upgrade Workload Cluster

v1.26.8->v1.27.8->1.28.4
TKG 2.3.1/v1.25.13

1. Upgrade Workload Cluster

v1.25.13->v1.26.8

2. Upgrade Management Cluster

TKG 2.3.1->TKG 2.4.1->TKG 2.5.0

3. Upgrade Workload Cluster

v1.26.8->v1.26.11

1. Upgrade Workload Cluster

v1.25.13->v1.26.8

2. Upgrade Management Cluster

TKG 2.3.1->TKG 2.4.1->TKG 2.5.0

3. Upgrade Workload Cluster

v1.26.8->v1.27.8

1. Upgrade Workload Cluster

v1.25.13->v1.26.8

2. Upgrade Management Cluster

TKG 2.3.1->TKG 2.4.1->TKG 2.5.0

3. Upgrade Workload Cluster

v1.26.8->v1.27.8->1.28.4
TKG 2.3.1/v1.26.8

1. Upgrade Management Cluster

TKG 2.3.1->TKG 2.4.1->TKG 2.5.0

2. Upgrade Workload Cluster

v1.26.8->v1.26.11

1. Upgrade Management Cluster

TKG 2.3.1->TKG 2.4.1->TKG 2.5.0

2. Upgrade Workload Cluster

v1.26.8->v1.27.8

1. Upgrade Management Cluster

TKG 2.3.1->TKG 2.4.1->TKG 2.5.0

2. Upgrade Workload Cluster

v1.26.8->v1.27.8->1.28.4
TKG 2.5.0/v1.26.11 NA v1.26.11 -> v1.27.8 v1.26.11 -> v1.27.8 ->1.28.4
TKG 2.5.0/v1.27.8 NA NA v1.27.8 ->1.28.4
Note: Ensure that the 1.22.17 and the 1.23.16 clusters in VMware Telco Cloud Automation 2.3 are upgraded to the 1.24.10 k8 version before migrating to VMware Telco Cloud Automation 3.1.
Note:

After migrating or upgrading to VMware Telco Cloud Automation 3.1, upgrade the existing management clusters’ add-ons and existing workload cluster TCA Bom Release (TBR) to enable new features, such as Cluster Move Operation, and avoid network function downtime during cluster upgrading.

Upgrade Network Function to the version that is compatible with both Photon 3 and Photon 5 before upgrading the workload cluster to v1.27.8 to avoid node customization failure and network downtime during cluster upgrading.