Volume

emptyDir, hostPath, PV/PVC
Volume with emptyDir, hostPath, PV, PVC, for Kubernetes.


1. emptyDir


Volume with emptyDir for Kubernetes.

1-1) Pod

apiVersion: v1
kind: Pod
metadata:
  name: pod-volume-1
spec:
  containers:
  - name: container1
    image: kubetm/init
    volumeMounts:
    - name: empty-dir
      mountPath: /mount1
  - name: container2
    image: kubetm/init
    volumeMounts:
    - name: empty-dir
      mountPath: /mount2
  volumes:
  - name : empty-dir
    emptyDir: {}
mount | grep mount1
echo "file context" >> file.txt


2. hostPath


Volume with hostPath for Kubernetes.

2-1) Pod

apiVersion: v1
kind: Pod
metadata:
  name: pod-volume-3
spec:
  nodeSelector:
    kubernetes.io/hostname: k8s-node1
  containers:
  - name: container
    image: kubetm/init
    volumeMounts:
    - name: host-path
      mountPath: /mount1
  volumes:
  - name : host-path
    hostPath:
      path: /node-v
      type: DirectoryOrCreate


3. PVC / PV


Volume with PersistentVolume PersistentVolumeClaim for Kubernetes.

3-1) PersistentVolume

apiVersion: v1
kind: PersistentVolume
metadata:
  name: pv-03
spec:
  capacity:
    storage: 2G
  accessModes:
  - ReadWriteOnce
  local:
    path: /node-v
  nodeAffinity:
    required:
      nodeSelectorTerms:
      - matchExpressions:
        - {key: kubernetes.io/hostname, operator: In, values: [k8s-node1]}

3-2) PersistentVolumeClaim

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: pvc-01
spec:
  accessModes:
  - ReadWriteOnce
  resources:
    requests:
      storage: 1G
  storageClassName: ""

3-3) Pod

apiVersion: v1
kind: Pod
metadata:
  name: pod-volume-3
spec:
  containers:
  - name: container
    image: kubetm/init
    volumeMounts:
    - name: pvc-pv
      mountPath: /mount3
  volumes:
  - name : pvc-pv
    persistentVolumeClaim:
      claimName: pvc-01


PersistentVolume

apiVersion: v1
kind: PersistentVolume
metadata:
  name: pv-04
  labels:
    pv: pv-04
spec:
  capacity:
    storage: 2G
  accessModes:
  - ReadWriteOnce
  local:
    path: /node-v
  nodeAffinity:
    required:
      nodeSelectorTerms:
      - matchExpressions:
        - {key: kubernetes.io/hostname, operator: In, values: [k8s-node1]}

PersistentVolumeClaim

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: pvc-04
spec:
  accessModes:
  - ReadWriteOnce
  resources:
    requests:
      storage: 2G
  storageClassName: ""
  selector:
    matchLabels:
      pv: pv-04


Tips


hostPath Type

  • DirectoryOrCreate : 실제 경로가 없다면 생성
  • Directory : 실제 경로가 있어야됨
  • FileOrCreate : 실제 경로에 파일이 없다면 생성
  • File : 실제 파일이 었어야함


Referenece


Kubernetes