I'm trying to mount mongo /data directory on to a NFS volume in my kubernetes master machine for persisting mongo data. I see the volume is mounted successfully but I can see only configdb and db dirs but not their subdirectories. And I see the data is not even persisting in the volume. when I kubectl describe <my_pv> it shows NFS (an NFS mount that lasts the lifetime of a pod)
Why is that so?
I see in kubernetes docs stating that:
An nfs volume allows an existing NFS (Network File System) share to be mounted into your pod. Unlike emptyDir, which is erased when a Pod is removed, the contents of an nfs volume are preserved and the volume is merely unmounted. This means that an NFS volume can be pre-populated with data, and that data can be “handed off” between pods. NFS can be mounted by multiple writers simultaneously.
I'm using kubernetes version 1.8.3.
mongo-deployment.yml:
apiVersion: apps/v1beta2
kind: Deployment
metadata:
name: mongo
labels:
name: mongo
app: mongo
spec:
replicas: 3
selector:
matchLabels:
name: mongo
app: mongo
template:
metadata:
name: mongo
labels:
name: mongo
app: mongo
spec:
containers:
- name: mongo
image: mongo:3.4.9
ports:
- name: mongo
containerPort: 27017
protocol: TCP
volumeMounts:
- name: mongovol
mountPath: "/data"
volumes:
- name: mongovol
persistentVolumeClaim:
claimName: mongo-pvc
mongo-pv.yml:
apiVersion: v1
kind: PersistentVolume
metadata:
name: mongo-pv
labels:
type: NFS
spec:
capacity:
storage: 5Gi
accessModes:
- ReadWriteMany
persistentVolumeReclaimPolicy: Retain
storageClassName: slow
mountOptions:
- hard
- nfsvers=4.1
nfs:
path: "/mongodata"
server: 172.20.33.81
mongo-pvc.yml:
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: mongo-pvc
spec:
accessModes:
- ReadWriteMany
resources:
requests:
storage: 3Gi
storageClassName: slow
selector:
matchLabels:
type: NFS
The way I mounted my nfs share on my kubernetes master machine:
1) apt-get install nfs-kernel-server
2) mkdir /mongodata
3) chown nobody:nogroup -R /mongodata
4) vi /etc/exports
5) added the line "/mongodata *(rw,sync,all_squash,no_subtree_check)"
6) exportfs -ra
7) service nfs-kernel-server restart
8) showmount -e ----> shows the share
I logged into the bash of my pod and I see the directory is mounted correctly but data is not persisting in my nfs server (kubernetes master machine).
Please help me see what I am doing wrong here.
