Nfs K8s

If you want a minimal Ubuntu setup just to run an NFS server. Here’s how you can quickly set that up on a VM or bare metal:

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Step 1: Install Ubuntu Server (minimal) • Download Ubuntu Server ISO from ubuntu.com • Install with default settings, no GUI, minimal install.

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Step 2: Install NFS server

Log in to your Ubuntu machine, then:

sudo apt update sudo apt install nfs-kernel-server

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Step 3: Prepare export directory

Choose or create the folder you want to share, e.g., /srv/nfs:

sudo mkdir -p /srv/nfs sudo chown nobody:nogroup /srv/nfs sudo chmod 755 /srv/nfs

Put your files (or ISO, whatever) inside /srv/nfs.

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Step 4: Configure NFS exports

Edit /etc/exports:

sudo nano /etc/exports

Add a line like this to share /srv/nfs to your local network (replace with your subnet):

/srv/nfs 192.168.1.0/24(rw,sync,no_subtree_check,no_root_squash)

•	rw = read/write access
•	sync = write changes immediately
•	no_root_squash = clients can access as root (optional, use with care)

Save and exit.

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Step 5: Apply export rules

sudo exportfs -ra

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Step 6: Start and enable NFS server

sudo systemctl restart nfs-kernel-server sudo systemctl enable nfs-kernel-server

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Step 7: Firewall (if enabled)

Allow NFS ports:

sudo ufw allow from 192.168.1.0/24 to any port nfs

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Now your Ubuntu NFS server is ready.

Clients on the specified subnet can mount the share like:

sudo mount your.nfs.server.ip:/srv/nfs /mnt

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If You want to mount an external NFS share inside your Kubernetes cluster so your pods can use it as persistent storage.

Here’s a simple way to do it:

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Step 1: Create a PersistentVolume (PV) for the NFS share

Replace your.nfs.server.ip with your actual NFS server IP or hostname.

apiVersion: v1
kind: PersistentVolume
metadata:
  name: nfs-pv
spec:
  capacity:
    storage: 100Gi      # Set this according to your NFS share size or quota
  accessModes:
    - ReadWriteMany
  persistentVolumeReclaimPolicy: Retain
  nfs:
    server: your.nfs.server.ip
    path: /srv/nfs       # The exported directory on the NFS server

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Step 2: Create a PersistentVolumeClaim (PVC) to request the storage

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: nfs-pvc
spec:
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 100Gi

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Step 3: Use the PVC in your Pod or Deployment

Example Pod manifest using the PVC:

apiVersion: v1
kind: Pod
metadata:
  name: nfs-client
spec:
  containers:
    - name: app
      image: busybox
      command: [ "sleep", "3600" ]
      volumeMounts:
        - name: nfs-storage
          mountPath: /mnt/nfs
  volumes:
    - name: nfs-storage
      persistentVolumeClaim:
        claimName: nfs-pvc

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Notes: • Make sure your NFS server allows connections from your Kubernetes nodes (firewall, export permissions). • ReadWriteMany access mode allows multiple pods to mount the volume simultaneously. • You might want to adjust storage sizes in PV and PVC to fit your needs. • If your NFS server hostname isn’t resolvable in your cluster, use the IP address.

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