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Volumes 개요

 
  • 컨테이너가 스토리지에 액세스 하고 공유하는 방법
  • 각 컨테이너 파일 시스템의 볼륨을 마운트하여 생성

Volume 종류

https://subicura.com/k8s/guide/local-volume.html

Volume 종류Volume TypeOverView설명

임시볼륨

empty-dir

파드가 시작될 때 빈 상태로 시작

루트디스크 또는 램에서 제공된다

컨테이너끼리 파일을 공유

Pod가 삭제되면 사라짐

로컬볼륨

hostpath

local

host node에서 제공된다

Pod가 재배포되었을때 node가 달라질 수 있다

node와 파일을 공유하기 위해 사용

네트워크 볼륨

iSCSI

NFS

glusterFS

...

네트워크 스토리지를 사용한다.

클라우드 네트워크 볼륨

azureFile

awsEBS

gcePersistentDisk

...

https://kimjingo.tistory.com/153


클라우드스토리지를 사용한다.


Persistent Volume(PV) / Persistent Volume Claim(PVC)

프로비저너

각 스토리지클래스에는 PV 프로비저닝에 사용되는 볼륨 플러그인을 결정하는 프로비저너가 있다. 이 필드는 반드시 지정해야 한다.

볼륨 플러그인내부 프로비저너설정 예시
AWSElasticBlockStore✓AWS EBS
AzureFile✓Azure 파일
AzureDisk✓Azure 디스크
CephFS--
Cinder✓OpenStack Cinder
FC--
FlexVolume--
GCEPersistentDisk✓GCE PD
iSCSI--
NFS-NFS
RBD✓Ceph RBD
VsphereVolume✓vSphere
PortworxVolume✓Portworx 볼륨
Local-Local

Storage Class

sansae@sansaeAir15m2 k8s-lab-workspace % k get sc
NAME                    PROVISIONER          RECLAIMPOLICY   VOLUMEBINDINGMODE      ALLOWVOLUMEEXPANSION   AGE
azurefile               file.csi.azure.com   Delete          Immediate              true                   2d6h
azurefile-csi           file.csi.azure.com   Delete          Immediate              true                   2d6h
azurefile-csi-premium   file.csi.azure.com   Delete          Immediate              true                   2d6h
azurefile-premium       file.csi.azure.com   Delete          Immediate              true                   2d6h
default (default)       disk.csi.azure.com   Delete          WaitForFirstConsumer   true                   2d6h
managed                 disk.csi.azure.com   Delete          WaitForFirstConsumer   true                   2d6h
managed-csi             disk.csi.azure.com   Delete          WaitForFirstConsumer   true                   2d6h
managed-csi-premium     disk.csi.azure.com   Delete          WaitForFirstConsumer   true                   2d6h
managed-premium         disk.csi.azure.com   Delete          WaitForFirstConsumer   true                   2d6h


sansae@sansaeAir15m2 k8s-lab-workspace % k edit sc azurefile
allowVolumeExpansion: true
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  creationTimestamp: "2024-03-08T01:58:10Z"
  labels:
    addonmanager.kubernetes.io/mode: EnsureExists
    kubernetes.io/cluster-service: "true"
  name: azurefile
  resourceVersion: "352"
  uid: eb098551-1947-41af-9430-3ae37b28c7b8
mountOptions:
- mfsymlinks
- actimeo=30
- nosharesock
parameters:
  skuName: Standard_LRS
provisioner: file.csi.azure.com
reclaimPolicy: Delete
volumeBindingMode: Immediate



Persistent Volume Claim(PVC) Manifest (Dynamic)

pvc.yaml
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: foo-pvc
spec:
  storageClassName: azurefile # 빈 문자열은 명시적으로 설정해야 하며 그렇지 않으면 기본 스토리지클래스가 설정됨
  accessModes: [ "ReadWriteOnce" ]
  resources:
    requests:
      storage: 1Gi

Persistent Volume Claim 실습

sansae@sansaeAir15m2 k8s-lab-workspace % k get pv
No resources found
sansae@sansaeAir15m2 k8s-lab-workspace % k get pvc
No resources found in default namespace.

sansae@sansaeAir15m2 k8s-lab-workspace % k apply -f pvc.yaml 
persistentvolumeclaim/foo-pvc created
sansae@sansaeAir15m2 k8s-lab-workspace % k get pvc
NAME      STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS   AGE
foo-pvc   Bound    pvc-735e1382-f1e1-40f3-8378-25e72ebda4b0   1Gi        RWO            azurefile      3s
sansae@sansaeAir15m2 k8s-lab-workspace % k get pv
NAME                                       CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS   CLAIM             STORAGECLASS   REASON   AGE
pvc-735e1382-f1e1-40f3-8378-25e72ebda4b0   1Gi        RWO            Delete           Bound    default/foo-pvc   azurefile               5s
sansae@sansaeAir15m2 k8s-lab-workspace %
statefulset.yaml 
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: web
spec:
  selector:
    matchLabels:
      app: nginx
  serviceName: "nginx"
  replicas: 3 # 기본값은 1
  minReadySeconds: 10 # 기본값은 0
  template:
    metadata:
      labels:
        app: nginx
    spec:
      terminationGracePeriodSeconds: 10
      containers:
      - name: nginx
        image: nginx:1.15.12
        ports:
        - containerPort: 80
          name: web
        volumeMounts:
        - name: www
          mountPath: /usr/share/nginx/html
  volumeClaimTemplates:
  - metadata:
      name: www
    spec:
      accessModes: [ "ReadWriteOnce" ]
      storageClassName: azurefile
      resources:
        requests:
          storage: 1Gi
statefulset.yaml 실습 
sansae@sansaeAir15m2 k8s-lab-workspace % k apply -f statefulset.yaml 
service/nginx-stps created
statefulset.apps/web created

sansae@sansaeAir15m2 k8s-lab-workspace % k get pvc
NAME        STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS   AGE
www-web-0   Bound    pvc-d7a6b825-edeb-4f06-813f-eef6abe19398   1Gi        RWO            azurefile      52s
www-web-1   Bound    pvc-a2ebaeef-ae82-47bc-8988-6bb6ca0a9067   1Gi        RWO            azurefile      32s
www-web-2   Bound    pvc-e17e5080-4403-4131-9d2b-f143431681df   1Gi        RWO            azurefile      12s

sansae@sansaeAir15m2 k8s-lab-workspace % k get pv
NAME                                       CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS   CLAIM               STORAGECLASS   REASON   AGE
pvc-a2ebaeef-ae82-47bc-8988-6bb6ca0a9067   1Gi        RWO            Delete           Bound    default/www-web-1   azurefile               55s
pvc-d7a6b825-edeb-4f06-813f-eef6abe19398   1Gi        RWO            Delete           Bound    default/www-web-0   azurefile               74s
pvc-e17e5080-4403-4131-9d2b-f143431681df   1Gi        RWO            Delete           Bound    default/www-web-2   azurefile               34s



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