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Interview Questions:

  1. Explain the deployment pattern you'd use to deploy MySQL on Kubernetes while ensuring data persistence and high availability.

    Answer: To deploy MySQL on Kubernetes with data persistence and high availability, I'd use a combination of StatefulSets and PersistentVolumeClaims (PVCs). StatefulSets provide unique network identities for each pod, and PVCs ensure data is retained even if pods are restarted or rescheduled.

  2. Describe the role of a Kubernetes StatefulSet when deploying MySQL.

    Answer: A Kubernetes StatefulSet is the ideal choice for deploying stateful applications like MySQL. It maintains stable network identities for pods, manages ordered scaling, ensures ordered pod termination, and allows data persistence across pod rescheduling.

  3. What is the purpose of using a PersistentVolumeClaim (PVC) when deploying MySQL on Kubernetes?

    Answer: A PersistentVolumeClaim defines a request for storage resources, and when used with a StorageClass, dynamically provisions PersistentVolumes for pods. For MySQL, PVCs guarantee data persistence by binding the same volume even after pod rescheduling.

  4. Explain the concept of a StorageClass and how it contributes to deploying MySQL on Kubernetes.

    Answer: A StorageClass is an abstraction that defines the storage provisioner and settings for dynamically creating PersistentVolumes. When deploying MySQL, StorageClass allows automatic provisioning of storage resources for PersistentVolumeClaims, ensuring data persistence.

Manifest File Examples:

  1. MySQL StorageClass and PersistentVolumeClaim (PVC) Manifests:

    • StorageClass (mysql-storageclass.yaml):

      apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: mysql-storage
provisioner: kubernetes.io/no-provisioner
volumeBindingMode: WaitForFirstConsumer

    • PersistentVolumeClaim (mysql-pvc.yaml):

      apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: mysql-pvc
spec:
  storageClassName: mysql-storage
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 1Gi

  2. MySQL Deployment Manifest (mysql-deployment.yaml):

    apiVersion: apps/v1
kind: Deployment
metadata:
  name: mysql-deployment
spec:
  replicas: 1
  selector:
    matchLabels:
      app: mysql
  template:
    metadata:
      labels:
        app: mysql
    spec:
      containers:
        - name: mysql
          image: mysql:latest
          env:
            - name: MYSQL_ROOT_PASSWORD
              value: rootpassword
          ports:
            - containerPort: 3306
          volumeMounts:
            - name: mysql-data
              mountPath: /var/lib/mysql
      volumes:
        - name: mysql-data
          persistentVolumeClaim:
            claimName: mysql-pvc