I'm trying to use kubernetes with a spring boot application and use mysql. But i found this error on minikube dashboard:
0/1 nodes are available: 1 pod has unbound immediate PersistentVolumeClaims.Back-off restarting failed container
A secret file is created for boath user and admin and a configMap file also to map the spring boot image to the service of mysql. Mysql deployement file is:
apiVersion: v1
kind: Service
metadata:
name: mysql # DNS name
labels:
app: mysql
tier: database
spec:
ports:
- port: 3306
targetPort: 3306
selector: # mysql Pod Should contain same labels
app: mysql
tier: database
clusterIP: None # We Use DNS, Thus ClusterIP is not relevant
---
# Define a 'Persistent Volume Claim'(PVC) for Mysql Storage, dynamically provisioned by cluster
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: mysql-pv-claim # name of PVC essential for identifying the storage data
labels:
app: mysql
tier: database
spec:
accessModes:
- ReadWriteOnce #This specifies the mode of the claim that we are trying to create.
resources:
requests:
storage: 1Gi #This will tell kubernetes about the amount of space we are trying to claim.
---
# Configure 'Deployment' of mysql server
apiVersion: apps/v1
kind: Deployment
metadata:
name: mysql
labels:
app: mysql
tier: database
spec:
selector: # mysql Pod Should contain same labels
matchLabels:
app: mysql
tier: database
strategy:
type: Recreate
template:
metadata:
labels: # Must match 'Service' and 'Deployment' selectors
app: mysql
tier: database
spec:
containers:
- image: mysql:latest # image from docker-hub
args:
- "--ignore-db-dir=lost+found" # Workaround for https://github.com/docker-library/mysql/issues/186
name: mysql
env:
- name: MYSQL_ROOT_PASSWORD # Setting Root Password of mysql From a 'Secret'
valueFrom:
secretKeyRef:
name: db-admin # Name of the 'Secret'
key: password # 'key' inside the Secret which contains required 'value'
- name: MYSQL_USER # Setting USER username on mysql From a 'Secret'
valueFrom:
secretKeyRef:
name: db-user
key: username
- name: MYSQL_PASSWORD # Setting USER Password on mysql From a 'Secret'
valueFrom:
secretKeyRef:
name: db-user
key: password
- name: MYSQL_DATABASE # Setting Database Name from a 'ConfigMap'
valueFrom:
configMapKeyRef:
name: db-config
key: name
ports:
- containerPort: 3306
name: mysql
volumeMounts: # Mounting volume obtained from Persistent Volume Claim
- name: mysql-persistent-storage
mountPath: /var/lib/mysql #This is the path in the container on which the mounting will take place.
volumes:
- name: mysql-persistent-storage # Obtaining 'volume' from PVC
persistentVolumeClaim:
claimName: mysql-pv-claim
I'm new with kubernetes and I can't find solution.
You need to create a PV to satisfy the PVC. If you apply the below PV it should work.
apiVersion: v1
kind: PersistentVolume
metadata:
name: task-pv-volume
labels:
type: local
spec:
capacity:
storage: 1Gi
accessModes:
- ReadWriteOnce
hostPath:
path: "/mnt/data"
Please note below points
hostPath
is not recommended in productioncapacity
of PV and PVC needs to matchaccessModes
of PV and PVC needs to match