Mongo Persistence NOT Retaining Data on K8S Cluster After Reboot
2/23/2022
I have created my own k8s cluster using Kubeadm with two Ubuntu virtual servers - one master and one worker node. I also deployed a Springboot app with MongoDB persistence and it works absolutely fine. Below are the nodes in my k8s cluster
Below are the contents of my yaml file which creates storage class, persistence volume, persistence volume claim, mongo deployment and mongo service
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
name: local-storage
provisioner: kubernetes.io/no-provisioner
volumeBindingMode: WaitForFirstConsumer
allowVolumeExpansion: true
reclaimPolicy: Retain
---
apiVersion: v1
kind: PersistentVolume
metadata:
name: mongo-pv
spec:
capacity:
storage: 5Gi
volumeMode: Filesystem
accessModes:
- ReadWriteMany
persistentVolumeReclaimPolicy: Retain
storageClassName: local-storage
hostPath:
path: "/home/moviepopcorn/mongodb/data"
nodeAffinity:
required:
nodeSelectorTerms:
- matchExpressions:
- key: kubernetes.io/hostname
operator: In
values:
- node1
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: mongo-pvc
spec:
volumeName: mongo-pv
volumeMode: Filesystem
storageClassName: local-storage
accessModes:
- ReadWriteMany
resources:
requests:
storage: 5Gi
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: mongo
labels:
app: mongo
spec:
selector:
matchLabels:
app: mongo
template:
metadata:
labels:
app: mongo
spec:
containers:
- name: mongo
image: mongo:4.4.11
ports:
- containerPort: 27017
volumeMounts:
- name: mongo-persistent-storage
mountPath: /home/moviepopcorn/mongodb/data
volumes:
- name: mongo-persistent-storage
persistentVolumeClaim:
claimName: mongo-pvc
---
apiVersion: v1
kind: Service
metadata:
name: mongo-service
spec:
selector:
app: mongo
ports:
- protocol: TCP
port: 27017
targetPort: 27017
Data stored from my Springboot into mongodb is not retained once I reboot the nodes in my k8s cluster. Could you please help me understand on what mistake I am doing?
-- Srinivasan Ramu
kubernetes
local-storage
mongodb
persistence
persistent-volumes
Similar Questions
1 Answer
2/23/2022
May you have updated the PVC mount path and due to that mongo not aware of where to store or save the data
apiVersion: apps/v1
kind: Deployment
metadata:
creationTimestamp: null
labels:
app: mongo
name: mongo
spec:
replicas: 1
selector:
matchLabels:
app: mongo
strategy: {}
template:
metadata:
creationTimestamp: null
labels:
app: mongo
spec:
containers:
- image: mongo
name: mongo
args: ["--dbpath","/data/db"]
livenessProbe:
exec:
command:
- mongo
- --disableImplicitSessions
- --eval
- "db.adminCommand('ping')"
initialDelaySeconds: 30
periodSeconds: 10
timeoutSeconds: 5
successThreshold: 1
failureThreshold: 6
readinessProbe:
exec:
command:
- mongo
- --disableImplicitSessions
- --eval
- "db.adminCommand('ping')"
initialDelaySeconds: 30
periodSeconds: 10
timeoutSeconds: 5
successThreshold: 1
failureThreshold: 6
env:
- name: MONGO_INITDB_ROOT_USERNAME
valueFrom:
secretKeyRef:
name: mongo-creds
key: username
- name: MONGO_INITDB_ROOT_PASSWORD
valueFrom:
secretKeyRef:
name: mongo-creds
key: password
volumeMounts:
- name: "mongo-data-dir"
mountPath: "/data/db"
volumes:
- name: "mongo-data-dir"
persistentVolumeClaim:
claimName: "pvc"Try the above example or check the arg and mount path for reference.
-- Harsh Manvar
Source: StackOverflow