Creating and Deleting a TanzuMySQL Instance

Warning: VMware Tanzu™ SQL with MySQL for Kubernetes is currently in beta and is intended for evaluation and test purposes only. Do not use this product in a production environment. If you discover any bugs, contact Support.

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This topic describes how you, as a developer, deploy and delete TanzuMySQL instances.

Prerequisites

Before you can create or delete TanzuMySQL instances, you must have:

• The Kubernetes Command Line Interface (kubectl) installed: For more information, see the Kubernetes documentation.

• Full admin access to all Kubernetes resources in your developer namespace.

  For information about Roles and RoleBindings that your Kubernetes cluster admin needs to create, see the Kubernetes documentation.

• The URL and credentials to access the registry that stores the Tanzu MySQL for Kubernetes images. This can be the VMware Tanzu Network registry or the private registry configured for your environment. If you do not have access to the registry credentials, contact your Kubernetes admin to have these set up for you in your namespace.

Create a TanzuMySQL Instance

To create a TanzuMySQL instance:

1. Target the namespace where you want to create the TanzuMySQL instance:

   kubectl config set-context --current --namespace=DEVELOPMENT-NAMESPACE
   

   Where DEVELOPMENT-NAMESPACE is the namespace in which you want to create the instance.

   For example:

   $ kubectl config set-context --current --namespace=my-namespace
   

2. From your namespace, Kubernetes must be able to access the registry that stores the Tanzu MySQL for Kubernetes images. To allow this, create an imagePullSecret by running:

   kubectl --namespace=DEVELOPMENT-NAMESPACE create secret docker-registry tanzu-mysql-image-registry --docker-server=REGISTRY-SERVER-URL --docker-username=DOCKER-USERNAME --docker-password=DOCKER-PASSWORD
   

   Where:

   • DEVELOPMENT-NAMESPACE is the namespace in which you want to create the instance
   • REGISTRY-SERVER-URL is the VMware Tanzu Network registry or the private registry configured for your environment
   • DOCKER-USERNAME and DOCKER-PASSWORD are the credentials used to pull images from the registry.

   For example:

   $ kubectl create secret --namespace=my-namespace \
   docker-registry tanzu-mysql-image-registry  \
   --docker-server=https://registry.pivotal.io/ \
   --docker-username=sample-username  \
   --docker-password=sample-password
   
   secret/tanzu-mysql-image-registry created
   

3. Create a tanzumysql.yaml file. You can use the template below:

   apiVersion: mysql.tanzu.vmware.com/v1alpha1
   kind: TanzuMySQL
   metadata:
     name: tanzumysql-sample
   spec:
     storageSize: 1Gi
     imagePullSecret: tanzu-mysql-image-registry
   
   #### Set the storage class name to change storage class of the PVC associated with this resource
   #  storageClassName: standard
   
   #### Examples to set resource limit/request for mysql/backups containers.
   
   #  resources:
   
   #### This is the container running the mysql server.
   #    mysql:
   #      limits:
   #        cpu: 3
   #        memory: 800Mi
   #      requests:
   #        cpu: 2
   #        memory: 500Mi
   #### This is the sidecar container that takes a backup and streams to the storage backend.
   #    backups:
   #      limits:
   #        cpu: 2
   #        memory: 500Mi
   #      requests:
   #        cpu: 1
   #        memory: 200Mi
   

4. Edit the tanzumysql.yaml file. For an explanation of the properties that you can set in this file, see Property Reference for tanzumysql.yml.

5. Deploy a TanzuMySQL instance to Kubernetes by running:

   kubectl -n DEVELOPMENT-NAMESPACE apply -f tanzumysql.yaml
   

   For example:

   $ kubectl -n my-namespace apply -f tanzumysql.yaml
   tanzumysql.mysql.tanzu.vmware.com/tanzumysql-sample created
   

6. Verify that the instance was created successfully by running:

   kubectl get tanzumysql INSTANCE-NAME
   

   Where INSTANCE-NAME is the value that you configured for metadata.name in the tanzumysql.yaml file.
   
   For example:

   $ kubectl get tanzumysql tanzumysql-sample
   NAME                READY   STATUS    AGE
   tanzumysql-sample   true    Running   2m17s
   

Delete a TanzuMySQL Instance

This section provides some conceptual information about persistent volume claims (PVCs) and deleting an instance. It also provides the procedure for how to delete an instance.

About PVCs

When you create a TanzuMySQL instance, the Tanzu MySQL operator also creates a persistent volume claim (PVC). This PVC is attached to the instance and contains the data for the MySQL database.

The PVC name contains the instance name and the TanzuMySQL Pod number. Currently only one Pod is allowed per instance, so the PVC name is of the form mysql-data-INSTANCE-NAME-N. For example, mysql-data-tanzumysql-sample-0

Note: Currently only one Pod is allowed per instance, so N is always 0.

About Deleting a TanzuMySQL Instance

There are two steps to deleting an instance. The first step is to delete the instance itself, and the second step is to delete the PVC.

There are situations where you want to delete the instance but not delete the PVC. For example, in a test environment, you might delete the instance to save costs but keep the PVC storing the data.

If you later create a new instance with the same name as the deleted instance, the old PVC automatically reattaches to the new instance and you have access to your data again.

Note: If you delete the Pod or the StatefulSet associated with the Tanzu MySQL for Kubernetes resource, a Tanzu MySQL for Kubernetes controller re-creates it for you. To permanently delete the instance, you need to delete the tanzumysql resource, as described in step 1 below.

Procedure

To delete a TanzuMySQL instance:

1. Delete the TanzuMySQL instance by running:

   kubectl -n DEVELOPMENT-NAMESPACE delete tanzumysql INSTANCE-NAME
   

   Where:

   • DEVELOPMENT-NAMESPACE is the namespace where you created the instance.
   • INSTANCE-NAME is the name of the instance you want to delete.

   For example:

   $ kubectl -n my-namespace delete tanzumysql tanzumysql-sample
   my-namespace "tanzumysql-sample" deleted
   

2. (Optional) Delete the Persistent Volume Claim (PVC).

   Warning: This is a destructive action. If you destroy your PVC, you delete all data associated with your Tanzu MySQL for Kubernetes database.

   1. Review your PVCs by running:

      kubectl get pvc
      

      For example:

      $ kubectl get pvc
      NAME                              STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS   AGE
      mysql-data-tanzumysql-sample-0    Bound    pvc-3262e841-c4aa-4aa4-b53a-68cd3078f806   1Gi        RWO            standard       7d1h
      mysql-data-another-sample-0       Bound    pvc-87c8a3a9-263b-46e6-8acb-ed474434fd24   1Gi        RWO            standard       6d21h

   2. Identify the names of the PVCs that correspond to the name of the instance you deleted above.

   3. Delete the PVC associated with each TanzuMySQL Pod by running, for each Pod:

      kubectl delete pvc mysql-data-INSTANCE-NAME-N
      

      Where:

      • INSTANCE-NAME is the name of the TanzuMySQL instance that you deleted above.
      • N is the index of each Pod in the TanzuMySQL instance.

      For example:

      $ kubectl delete pvc mysql-data-tanzumysql-sample-0
      persistentvolumeclaim "mysql-data-tanzumysql-sample-0" deleted