Creating and Deleting MySQL Instances
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This topic describes how you, as a developer, deploy and delete MySQL instances.
Before you can create or delete MySQL 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.
To create a MySQL instance:
Target the namespace where you want to create the MySQL instance:
kubectl config set-context --current --namespace=DEVELOPMENT-NAMESPACE
DEVELOPMENT-NAMESPACEis the namespace in which you want to create the instance.
$ kubectl config set-context --current --namespace=my-namespace
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
DEVELOPMENT-NAMESPACEis the namespace in which you want to create the instance
REGISTRY-SERVER-URLis the VMware Tanzu Network registry or the private registry configured for your environment
DOCKER-PASSWORDare the credentials used to pull images from the registry.
$ 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
mysql.yamldeployment template that you downloaded in the Tanzu MySQL Deployment Templates TGZ file from VMware Tanzu Network. For how to download deployment templates, see Download the Resources in Installing the Tanzu SQL for Kubernetes Operator.
Create a copy of the
mysql.yamlfile and give it a unique name.
$ cp ~/Downloads/tanzu-mysql-deployment-templates-1.0.0/samples/mysql.yaml testdb.yaml
Edit the file. For information about the properties that you can set for the MySQL resource, see Property Reference for the MySQL Resource.
Deploy a MySQL instance to Kubernetes by running:
kubectl -n DEVELOPMENT-NAMESPACE apply -f FILENAME
FILENAMEis the name of the configuration file you created in Step 4 above.
$ kubectl -n my-namespace apply -f testdb.yaml mysql.with.sql.tanzu.vmware.com/mysql-sample created
Verify that the instance was created successfully by running:
kubectl -n DEVELOPMENT-NAMESPACE get mysql INSTANCE-NAME
INSTANCE-NAMEis the value that you configured for
metadata.namein your file
$ kubectl -n my-namespace get mysql mysql-sample NAME READY STATUS AGE mysql-sample true Running 2m17s
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.
When you create a MySQL instance, the MySQL Operator also creates PVCs. The PVCs are attached to the instance and contain the data for the MySQL database. Single-node instances have one PVC, and high-availability (HA) instances have three.
The PVC name contains the instance name and the MySQL Pod number.
The PVC name is of the form
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 PVCs.
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 PVCs automatically reattach to the new instance and you have access to your data again.
Note: If you delete the Pod or the StatefulSet associated with the MySQL resource, the Operator re-creates it for you. To permanently delete the instance, you need to delete the MySQL resource, as described in step 1 below.
To delete a MySQL instance:
Delete the MySQL instance by running:
kubectl -n DEVELOPMENT-NAMESPACE delete mysql INSTANCE-NAME
DEVELOPMENT-NAMESPACEis the namespace where you created the instance.
INSTANCE-NAMEis the name of the instance you want to delete.
$ kubectl -n my-namespace delete mysql mysql-sample my-namespace "mysql-sample" deleted
(Optional) Delete the PVCs by running:
Warning: This command is destructive. When you destroy your PVCs, you delete all data associated with your Tanzu MySQL for Kubernetes database.
kubectl delete pvc -l app.kubernetes.io/instance=INSTANCE-NAME
INSTANCE-NAMEis the name of the MySQL instance that you deleted above.
$ kubectl delete pvc -l app.kubernetes.io/instance=mysql-sample persistentvolumeclaim "mysql-data-mysql-sample-0" deleted
Note: For HA MySQL instances, the command deletes all three PVCs associated with the MySQL instance.