NOTE: This tutorial assumes you know how to connect to Kubernetes cluster.

Create secrets to securely store MySQL credentials

  1. Guide on how to create base 64 encoded values:
    Windows 10 guide

    Linux guide

  2. Create new file called: mysql-secret.yaml and paste below value.
    NOTE: You must first capture value in base 64 by following guide in step 1.

---
apiVersion: v1
kind: Secret
metadata:
  name: mysqldb-secrets
type: Opaque
data:
  ROOT_PASSWORD: c3VwZXItc2VjcmV0LXBhc3N3b3JkLWZvci1zcWw= 
  1. Excute below command to create secrets:
kubectl apply -f mysql-secret.yaml

Output:

secret/mysqldb-secrets created
  1. To see if the secret is created execute below command:
kubectl get secret
NAME                  TYPE                                  DATA   AGE
default-token-jqq69   kubernetes.io/service-account-token   3      6h20m
echo-tls              kubernetes.io/tls                     2      5h19m
mysqldb-secrets       Opaque                                1      42s
  1. To see the description of the secret execute below command:
kubectl describe secret mysqldb-secrets
Name:         mysqldb-secrets
Namespace:    default
Labels:       <none>
Annotations:  <none>

Type:  Opaque

Data
====
ROOT_PASSWORD:  29 bytes

Persistant volume and MySQL deployment

  1. Create a persistent volume yaml file called: mysql-pvc.yaml and paste below values:
apiVersion: v1
kind: PersistentVolume
metadata:
  name: mysql-pvc
  labels:
    type: local
spec:
  storageClassName: manual
  capacity:
    storage: 1Gi
  accessModes:
    - ReadWriteOnce
  hostPath:
    path: "/mnt/mysql-data"
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: mysql-pvc-claim
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 1Gi
  storageClassName: do-block-storage

  1. Create new deployment yaml file called: mysql-deployment.yaml and paste below values:
apiVersion: v1
kind: Service
metadata:
  name: mysql
spec:
  ports:
  - port: 3306
  selector:
    app: mysql
  clusterIP: None
---
apiVersion: apps/v1 # for versions before 1.9.0 use apps/v1beta2
kind: Deployment
metadata:
  name: mysql
spec:
  selector:
    matchLabels:
      app: mysql
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        app: mysql
    spec:
      containers:
      - image: mysql:5.6
        name: mysql
        env:
        - name: MYSQL_ROOT_PASSWORD
          valueFrom:
            secretKeyRef:
              name: mysqldb-secrets
              key: ROOT_PASSWORD
        ports:
        - containerPort: 3306
          name: mysql
        volumeMounts:
        - name: mysql-persistent-storage
          mountPath: /var/lib/mysql
      volumes:
      - name: mysql-persistent-storage
        persistentVolumeClaim:
          claimName: mysql-pvc-claim

Execute below command to create persistent volume:

kubectl apply -f mysql-pvc.yaml

Output:

persistentvolume/mysql-pvc created
persistentvolumeclaim/mysql-pvc-claim created

Execute below command to deploy mysql pod:

kubectl apply -f mysql-deployment.yaml

Output:

service/mysql created

Exposing MySQL as a Service

  1. Create a file called mysql-service.yaml and paste below values:
apiVersion: v1
kind: Service
metadata:
  name: mysql-service
spec:
  selector:
    app: mysql
  ports:
  - protocol: TCP
    port: 3306
    targetPort: 3306
  1. Excute below command to create a service for mysql:
kubectl apply -f mysql-service.yaml

Output:

service/mysql-service created
  1. To confirm if the service is created sucessfully, execute below command:
kubectl get svc

Output:

NAME            TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)    AGE
echo1           ClusterIP   10.245.179.199   <none>        80/TCP     6h4m
echo2           ClusterIP   10.245.58.44     <none>        80/TCP     6h2m
kubernetes      ClusterIP   10.245.0.1       <none>        443/TCP    6h33m
mysql           ClusterIP   None             <none>        3306/TCP   4m57s
mysql-service   ClusterIP   10.245.159.76    <none>        3306/TCP   36s