Kubernetes save mysql database's data inside a volume - mysql

Question

I'm new to kubernetes (using minikube) and i want to deploy an springboot app which uses mysql to store data.
I'm running my app inside a pod with 2 containers (one for my app and one for mysql), it works fine and as expected, my data are lost once i restard the pods (with a scale --replicas=0; scale --replicas=1 for exemple).
I'm using PersistentVolumeClaim, but still the data aren't stored, i'm for sure missing something important.
Here's my configuration file:
apiVersion: apps/v1
kind: Deployment
metadata:
name: esse-deployment-1
labels:
app: esse-1
spec:
replicas: 1
selector:
matchLabels:
app: esse-1
template:
metadata:
labels:
app: esse-1
spec:
containers:
- image: mysql:5.7
name: esse-datasource
ports:
- containerPort: 3306
env:
- name: MYSQL_ROOT_PASSWORD
value: root
volumeMounts:
- name: mysql-persistent-storage-esse-1
mountPath: /home/esse-1/data/mysql
- image: esse-application
name: esse-app
imagePullPolicy: Never
ports:
- containerPort: 8080
env:
- name: ESSE_DATABASE_USERNAME
value: root
- name: ESSE_DATABASE_PASSWORD
value: root
- name: ESSE_APPLICATION_CONTEXT
value: /esse-1
volumes:
- name: mysql-persistent-storage-esse-1
persistentVolumeClaim:
claimName: mysql-persistent-volume-claim-esse-1
---
apiVersion: v1
kind: Service
metadata:
name: esse-service-1
labels:
app: esse-1
spec:
selector:
app: esse-1
ports:
- protocol: TCP
port: 8080
targetPort: 8080
type: NodePort
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: mysql-persistent-volume-claim-esse-1
labels:
app: esse-1
spec:
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 1Gi

Answer 1

You need to mount the persistent volume to the directory where mysql is actually writing the database data to (adjust mountPath for the container). This is /var/lib/mysql in this case.