<p>I'm trying to mount a local folder as the <code>/data/db</code> of mongo in my minikube cluster. So far no luck :(</p>

<p>So, I followed <a href="https://leadwithoutatitle.wordpress.com/2018/03/05/how-to-deploy-mongodb-with-persistent-volume-in-kubernetes/" rel="nofollow noreferrer">these</a> steps. They describe how to create a persistent volume, a persistent volume claim, a service and a pod. </p>

<p>The config files make sense, but when I eventually spin up the pod, it restarts due to an error and then it keeps running. The log from the pod (<code>kubectl log mongo-0</code>) is</p>

<pre><code>2019-07-02T13:51:49.177+0000 I CONTROL  [main] note: noprealloc may hurt performance in many applications
2019-07-02T13:51:49.180+0000 I CONTROL  [main] Automatically disabling TLS 1.0, to force-enable TLS 1.0 specify --sslDisabledProtocols 'none'
2019-07-02T13:51:49.184+0000 I CONTROL  [initandlisten] MongoDB starting : pid=1 port=27017 dbpath=/data/db 64-bit host=mongo-0
2019-07-02T13:51:49.184+0000 I CONTROL  [initandlisten] db version v4.0.10
2019-07-02T13:51:49.184+0000 I CONTROL  [initandlisten] git version: c389e7f69f637f7a1ac3cc9fae843b635f20b766
2019-07-02T13:51:49.184+0000 I CONTROL  [initandlisten] OpenSSL version: OpenSSL 1.0.2g  1 Mar 2016
2019-07-02T13:51:49.184+0000 I CONTROL  [initandlisten] allocator: tcmalloc
2019-07-02T13:51:49.184+0000 I CONTROL  [initandlisten] modules: none
2019-07-02T13:51:49.184+0000 I CONTROL  [initandlisten] build environment:
2019-07-02T13:51:49.184+0000 I CONTROL  [initandlisten]     distmod: ubuntu1604
2019-07-02T13:51:49.184+0000 I CONTROL  [initandlisten]     distarch: x86_64
2019-07-02T13:51:49.184+0000 I CONTROL  [initandlisten]     target_arch: x86_64
2019-07-02T13:51:49.184+0000 I CONTROL  [initandlisten] options: { net: { bindIp: "0.0.0.0" }, storage: { mmapv1: { preallocDataFiles: false, smallFiles: true } } }
2019-07-02T13:51:49.186+0000 I STORAGE  [initandlisten] Detected data files in /data/db created by the 'wiredTiger' storage engine, so setting the active storage engine to 'wiredTiger'.
2019-07-02T13:51:49.186+0000 I STORAGE  [initandlisten] wiredtiger_open config: create,cache_size=483M,session_max=20000,eviction=(threads_min=4,threads_max=4),config_base=false,statistics=(fast),log=(enabled=true,archive=true,path=journal,compressor=snappy),file_manager=(close_idle_time=100000),statistics_log=(wait=0),verbose=(recovery_progress),
2019-07-02T13:51:51.913+0000 I STORAGE  [initandlisten] WiredTiger message [1562075511:913047][1:0x7ffa7b8fca80], txn-recover: Main recovery loop: starting at 3/1920 to 4/256
2019-07-02T13:51:51.914+0000 I STORAGE  [initandlisten] WiredTiger message [1562075511:914009][1:0x7ffa7b8fca80], txn-recover: Recovering log 3 through 4
2019-07-02T13:51:51.948+0000 I STORAGE  [initandlisten] WiredTiger message [1562075511:948068][1:0x7ffa7b8fca80], txn-recover: Recovering log 4 through 4
2019-07-02T13:51:51.976+0000 I STORAGE  [initandlisten] WiredTiger message [1562075511:976820][1:0x7ffa7b8fca80], txn-recover: Set global recovery timestamp: 0
2019-07-02T13:51:51.979+0000 I RECOVERY [initandlisten] WiredTiger recoveryTimestamp. Ts: Timestamp(0, 0)
2019-07-02T13:51:51.986+0000 W STORAGE  [initandlisten] Detected configuration for non-active storage engine mmapv1 when current storage engine is wiredTiger
2019-07-02T13:51:51.986+0000 I CONTROL  [initandlisten] 
2019-07-02T13:51:51.986+0000 I CONTROL  [initandlisten] ** WARNING: Access control is not enabled for the database.
2019-07-02T13:51:51.986+0000 I CONTROL  [initandlisten] **          Read and write access to data and configuration is unrestricted.
2019-07-02T13:51:51.986+0000 I CONTROL  [initandlisten] ** WARNING: You are running this process as the root user, which is not recommended.
2019-07-02T13:51:51.986+0000 I CONTROL  [initandlisten] 
2019-07-02T13:51:52.003+0000 I FTDC     [initandlisten] Initializing full-time diagnostic data capture with directory '/data/db/diagnostic.data'
2019-07-02T13:51:52.005+0000 I NETWORK  [initandlisten] waiting for connections on port 27017
</code></pre>

<p>If I connect to the MongoDB/pod, mongo is just running fine! 
But, it is not using the persistent volume. Here is my pv.yaml:</p>

<pre><code>kind: PersistentVolume
apiVersion: v1
metadata:
  name: mongo-pv
   labels:
     type: local
spec:
  storageClassName: manual
  capacity:
    storage: 1Gi
  accessModes:
    - ReadWriteOnce
  hostPath:
    path: "/k8s/mongo"
</code></pre>

<p>Inside the mongo pod is see the mongo files in <code>/data/db</code> but on my local machine (<code>/k8s/mongo</code>) the folder is empty.</p>

<p>Below I'll also list the persistent volume claim (pvc) and pod/service yaml</p>

<p>pvc.yaml:</p>

<pre><code>kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: mongo-pv-claim
spec:
  storageClassName: manual
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 1Gi
</code></pre>

<p>mongo.yaml:</p>

<pre><code>apiVersion: v1
kind: Service
metadata:
  name: mongo
  labels:
    name: mongo
spec:
  clusterIP: None
  ports:
  - port: 27017
    targetPort: 27017
  selector:
    role: mongo
---
apiVersion: apps/v1beta1
kind: StatefulSet
metadata:
  name: mongo
spec:
  serviceName: "mongo"
  replicas: 1
  template:
    metadata:
      labels:
        role: mongo
        environment: test
    spec:
      terminationGracePeriodSeconds: 10
      volumes:
        - name: mongo-pv-storage
          persistentVolumeClaim:
            claimName: mongo-pv-claim
      containers:
        - name: mongo
          image: mongo
          command:
            - mongod
            - "--bind_ip"
            - 0.0.0.0
            - "--smallfiles"
            - "--noprealloc"
          ports:
            - containerPort: 27017
          volumeMounts:
            - name: mongo-pv-storage
              mountPath: /data/db
</code></pre>

<p>I've also tried, instead of using <code>persistentVolumeClaim</code> to do</p>

<pre><code>volumes:
  - name: mongo-pv-storage
    hostPath:
      path: /k8s/mongo
</code></pre>

<p>Gives same issues except there is no error during creation.</p>

<p>Any suggestion what the problem might be or where to look next for more details?</p>

<p>Also, how are the PV and the PVC connected?</p>

Jeanluca Scaljeri
<p>Please try this </p>

<pre><code>apiVersion: apps/v1beta1
kind: StatefulSet
metadata:
  name: mongo
  app: mongodb
spec:
  replicas: 1
  template:
    metadata:
      labels:
        app: mongodb
    spec:
      terminationGracePeriodSeconds: 10
      containers:
        - name: mongo
          image: mongo:3
          ports:
            - containerPort: 27017
          volumeMounts:
            - name: mongo-persistent-volume
              mountPath: /data/db
  volumeClaimTemplates:
  - metadata:
      name: mongo-persistent-volume
    spec:
      accessModes: [ "ReadWriteOnce" ]
      resources:
        requests:
          storage: 5Gi
</code></pre>

<p>you can create whole new PVC and use that here or change the name. This is working for me also i faced same issue to configure mongoDB when passing commands. remove the commands and try it.</p>

<p>For more details check <a href="https://github.com/harsh4870/Single-pod-graylog-with-PVC/blob/master/templates/mongodb-deployment.yaml" rel="nofollow noreferrer">this</a> github</p>
