Upgrade Standalone Management Clusters

To upgrade Tanzu Kubernetes Grid with a standalone management cluster, you must first upgrade the standalone management cluster. You cannot upgrade workload clusters until you have upgraded the management cluster that manages them.

Important

Tanzu Kubernetes Grid v2.5.x does not support upgrading existing standalone TKG management clusters on AWS and Azure. For more information, see End of Support for TKG Management and Workload Clusters on AWS and Azure in the VMware Tanzu Kubernetes Grid v2.5.x Release Notes.

Tanzu Kubernetes Grid does not support upgrading management clusters to v2.5.1 on vSphere 6.7. For more information, see End of Support for TKG Management and Workload Clusters on vSphere 6.7.

Upgrading the management cluster automatically upgrades the auto-managed packages that it runs.

Note
After you have installed the Tanzu CLI but before a standalone management cluster has been upgraded, all context-specific CLI command groups (tanzu cluster, tanzu kubernetes-release) are unavailable and not included in Tanzu CLI --help output.

Management clusters and workload clusters use client certificates to authenticate clients. These certificates are valid for one year. To renew them, upgrade your clusters at least once a year or rotate them manually as described in Renew Cluster Certificates (Standalone MC) or the VMware Knowledge Base article How to rotate certificates in a Tanzu Kubernetes Grid cluster.

Prerequisites

You have reviewed the known issues for upgrade. See Known Issues.
- If the Avi Controller might have been rotated since the last management cluster upgrade, follow the steps in Before upgrade, you must manually update a changed Avi certificate in the tkg-system package values.
You performed the steps in Upgrading Tanzu Kubernetes Grid that occur before the step for upgrading management clusters.
Internet-restricted: If you deployed the previous version of Tanzu Kubernetes Grid in an Internet-restricted environment, you have performed the steps in Prepare an Internet-Restricted Environment to recreate and run the required scripts with the new component image versions.
Custom clusters: If you have workload clusters that use a custom ClusterClass definition, you have performed the steps in Upgrade Custom Clusters.
LDAP: If the previous version of the management cluster is integrated with an LDAP identity provider, you have performed the steps in (LDAP Only) Update LDAP Settings below.

(LDAP Only) Update LDAP Settings

Starting in Tanzu Kubernetes Grid v2.3, you must set the LDAP_BIND_DN and LDAP_BIND_PASSWORD variables when configuring an LDAP identity provider. Before upgrading a management cluster configured to use an LDAP identity provider to Tanzu Kubernetes Grid v2.5, set these variables if you have not already done so. Upgrading your management cluster without setting LDAP_BIND_DN and LDAP_BIND_PASSWORD causes the Pinniped App to fail to deploy and the App custom resource returns an error. For more information about these configuration variables, see Identity Providers - LDAP in Configuration File Variable Reference.

To update LDAP_BIND_DN and LDAP_BIND_PASSWORD, you must use the version of the management-cluster CLI plugin that corresponds to the version of your management cluster. Perform these steps before upgrading the management cluster:

Add LDAP_BIND_DN and LDAP_BIND_PASSWORD to the configuration file for your management cluster.
Confirm that the correct version of the management-cluster plugin is installed on your machine. For Tanzu Kubernetes Grid v2.5.2, the correct version is v0.32.3.
```
tanzu plugin list
```
If the correct version of the management-cluster plugin is not installed, do the following:
1. In the list of all available versions, locate the version of the management-cluster plugin that corresponds to the version of your management cluster:
```
tanzu plugin search -n management-cluster --show-details
```
2. Install the plugin:
```
tanzu plugin install management-cluster --version PLUGIN-VERSION
```
  Where PLUGIN-VERSION is the version that you located in the previous step.
Generate a new secret for the Pinniped package by running:
```
FILTER_BY_ADDON_TYPE=authentication/pinniped tanzu management-cluster create --dry-run -f YOUR-MANAGEMENT-CLUSTER-CONFIG-FILE.yaml > PINNIPED-PACKAGE-SECRET.yaml
```
Where YOUR-MANAGEMENT-CLUSTER-CONFIG-FILE.yaml is the configuration file you updated in the previous step and PINNIPED-PACKAGE-SECRET.yaml is the new secret for the Pinniped package.
Confirm that the resulting secret includes your updated settings, set the kubectl context to the management cluster, and apply the secret:
```
kubectl apply -f PINNIPED-PACKAGE-SECRET.yaml
```

Procedure

This procedure assumes that you are upgrading to Tanzu Kubernetes Grid v2.5.2.

Run the tanzu context use command to see an interactive list of management clusters available for upgrade.
```
tanzu context use
```
Select the management cluster that you want to upgrade. See List Management Clusters and Change Context for more information.
Get the admin credentials of the cluster. The Tanzu CLI alias mc is short for management-cluster.
```
tanzu mc kubeconfig get --admin
```
Connect kubectl to the management cluster.
```
kubectl config use-context MGMT-CLUSTER-NAME-admin@MGMT-CLUSTER-NAME.
```
You can copy the exact command, including the name of the management cluster context, from the output of the tanzu mc kubeconfig get --admin command that you ran in the preceding step.
Run the tanzu mc upgrade command and enter y to confirm.

Note
After you run this command, non-admin users cannot log in to the associated workload clusters until the Pinniped pods finish restarting.
```
tanzu mc upgrade
```
If multiple base VM images in your IaaS account have the same version of Kubernetes that you are upgrading to, you can include --os-name and other options to specify the target OS as described in Select an OS to Upgrade To:
```
tanzu mc upgrade --os-name ubuntu
```
On vSphere, you can use the --vsphere-vm-template-name option to specify a target OVA template for cluster nodes as described in Select an OVA Template to Upgrade To:
```
tanzu mc upgrade --vsphere-vm-template-name "/dc0/vm/tanzu/ubuntu-2204-kube-v1.28.11-vmware.1"
```
To skip the confirmation step when you upgrade a cluster, specify the --yes option.
```
tanzu mc upgrade --yes
```
The upgrade process first upgrades the Cluster API provider for vSphere that is running in the management cluster. Then, it upgrades the version of Kubernetes in all of the control plane and worker nodes of the management cluster.

Important
While a management cluster is upgrading, do not run tanzu cluster or tanzu mc commands against it or the workload clusters that it manages, for example from another bootstrap machine or shell window.

If the upgrade times out before it completes, run tanzu mc upgrade again and specify the --timeout option with a value greater than the default of 30 minutes.
```
tanzu mc upgrade --timeout 45m0s
```
Note
After you have installed the v2.5.x CLI but before a management cluster has been upgraded, all context-specific CLI command groups (tanzu cluster, tanzu kubernetes-release) plus all of the management-cluster plugin commands except for tanzu mc upgrade and tanzu mc create are unavailable and not included in Tanzu CLI --help output.

After the upgrade finishes, run the tanzu cluster list command with the --include-management-cluster -A options again to check that the management cluster has been upgraded.

tanzu cluster list --include-management-cluster -A

You see that the management cluster is now running the new version of Kubernetes, but that the workload clusters are still running previous versions of Kubernetes.

 NAME                 NAMESPACE   STATUS    CONTROLPLANE  WORKERS  KUBERNETES         ROLES       PLA   TKR
 k8s-1-26-8-cluster   default     running   1/1           1/1      v1.26.8+vmware.1  <none>      dev   v1.26.8---vmware.1-tkg.1
 k8s-1-27-5-cluster   default     running   1/1           1/1      v1.27.5+vmware.1  <none>      dev   v1.27.5---vmware.1-tkg.1
 mgmt-cluster         tkg-system  running   1/1           1/1      v1.28.11+vmware.1 management  dev   v1.28.11---vmware.1-tkg.1

Regenerate the admin kubeconfig:
```
tanzu management-cluster kubeconfig get --admin
```
The following is sample output of the command:
```
Credentials of cluster 'mgmt' have been saved
You can now access the cluster by running 'kubectl config use-context mgmt-admin@mgmt'
```
Important
If you don’t renew the kubeconfig after upgrading, you won’t be able to access the cluster once it expires.
Upgrade the management cluster certificate in the Tanzu CLI configuration.

See Update Management Cluster Certificate in Your Tanzu CLI Configuration for information.

What to Do Next

You can now:

Upgrade the workload clusters that this management cluster manages.
Create new workload clusters. By default, any new clusters that you deploy with this management cluster will run the new default version of Kubernetes. However, if required, you can use the tanzu cluster create command with the --tkr option to deploy new clusters that run different versions of Kubernetes. For more information, see Multiple Kubernetes Versions.
Migrate an Existing Management Cluster from DHCP to Node IPAM, if you originally configured the management cluster to use DHCP networking.