How can a high-availability MySQL cluster be deployed on Kubernetes?

To deploy a high availability MySQL cluster, Kubernetes can be used for management and deployment.

Here is a common method:

1. Create a ReplicationController: In Kubernetes, a ReplicationController is used to control the number of replicated Pods. By using a ReplicationController, it ensures that a specified number of Pods are always running.
2. Setting up a Service: A Service is an abstraction layer for providing network access. By creating a Service, a unified entry point can be established for the MySQL cluster.
3. Create a PersistentVolume: Since MySQL requires persistent storage for data, a PersistentVolume needs to be created to provide stable storage.
4. Create a StatefulSet: A StatefulSet is a controller used to manage stateful applications. Within a StatefulSet, you can define the number of replicas for a MySQL cluster and how to use persistent storage.
5. Setting up a MySQL cluster: The Pod template defined in StatefulSet can include MySQL configuration files and startup scripts. These files and scripts can be used to configure each node of the MySQL cluster.
6. Deploying a MySQL cluster: Deploy the MySQL cluster by creating a StatefulSet. Kubernetes will automatically create the designated number of Pods and distribute them to different nodes.
7. After deploying the MySQL cluster, it is necessary to perform some initialization tasks such as creating MySQL users and setting permissions.

By following the above steps, you can deploy a MySQL high availability cluster on Kubernetes. Please note that this is just a basic deployment process, and specific configurations and parameters may vary depending on actual requirements.