Configure migrations to use service accounts in Tanzu

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If you set up migrations and migration schedules using user accounts, you will encounter token expiration-related errors. To avoid these errors, Portworx, Inc. recommends setting up migration and migration schedules using service accounts. ​ In contrast to user accounts, which expire after a specified interval of time has passed, service account tokens do not expire. Using service accounts ensures that you will not encounter token expiration-related errors. See the User accounts versus service accounts section of the Kubernetes documentation for more details about the differences between service accounts and user accounts. ​ Perform the following steps on the destination cluster to configure migrations to use service accounts. ​

Create a service account and a cluster role binding

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1. Create a file called service-account-migration.yaml with the following content, specifying the namespace: to match one of the existing namespaces in your cluster. For this example we will use the default namespace:

    apiVersion: v1
    kind: ServiceAccount
    metadata:
      name: migration
      namespace: default

​ 2. Apply the spec: ​

kubectl apply -f service-account-migration.yaml

3. Create a file called cluster-role-binding-migration.yaml with the following content, specifying the namespace: field to match the namespace in the previous step:

   apiVersion: rbac.authorization.k8s.io/v1
   kind: ClusterRoleBinding
   metadata:
     name: migration-clusterrolebinding
   roleRef:
     apiGroup: rbac.authorization.k8s.io
     kind: ClusterRole
     name: cluster-admin
   subjects:
   - kind: ServiceAccount
     name: migration
     namespace: default

note

The roleRef.name field is set to cluster-admin. For details about super-user access, see the User-facing roles section of the Kubernetes documentation.

4. Apply the spec: ​

kubectl apply -f cluster-role-binding-migration.yaml

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Create a secret

You also need to create a secret. See the example below, the name in the annotation kubernetes.io/service-account.name must match the name of the service account that you created. ​

apiVersion: v1
kind: Secret
metadata:
  name: migration
  namespace: default
  annotations: 
    kubernetes.io/service-account.name: migration
type: kubernetes.io/service-account-token

​ Apply the secret: ​

kubectl apply -f <migrationsecretname>.yaml

Create a kubeconfig file

1. Download the create-migration-config.sh script file. Edit the file and change the values of the SERVER and NAMESPACE variables to match your environment.
2. To create a kubeconfig file, enter the following commands:

   chmod +x create-migration-config.sh && ./create-migration-config.sh > ~/.kube/migration-config.conf
3. Set the value of the KUBECONFIG environment variable to point to the kubeconfig file that you created in the previous step: ​

   export KUBECONFIG=~/.kube/migration-config.conf

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Create a ClusterPair

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1. Generate kubeconfig files, using the Create a kubeconfig file procedure.

2. Create an synchronous DR ClusterPair or Create an asynchronous DR ClusterPair depending upon your environment. ​