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Kubernetes - Storage: CSI (Container Storage Interface)

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• Kubernetes - Storage: CSI (Container Storage Interface)
  • CSI (Container Storage Interface)
  • Install csi-driver
  • Install Rancher
  • Lab: Install Rancher

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CSI (Container Storage Interface)

• CSI (Container Storage Interface)
  • a standard that lets storage vendors create plugins for Kubernetes, enabling it to use various block and file storage systems (like Amazon EBS, NFS, etc.) without needing code changes in Kubernetes core, making storage management standardized, extensible, and independent of Kubernetes releases for provisioning, attaching, and mounting volumes for stateful apps.

Install csi-driver

git clone https://github.com/kubernetes-csi/csi-driver-host-path.git
cd csi-driver-host-path

./deploy/kubernetes-latest/deploy.sh

kubectl apply -f ./examples/csi-storageclass.yaml
# storageclass.yaml
# storageclass.storage.k8s.io/csi-hostpath-sc created

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Install Rancher

Lab: Install Rancher

kubectl apply -f https://raw.githubusercontent.com/rancher/local-path-provisioner/master/deploy/local-path-storage.yaml
# namespace/local-path-storage created
# serviceaccount/local-path-provisioner-service-account created
# role.rbac.authorization.k8s.io/local-path-provisioner-role created
# clusterrole.rbac.authorization.k8s.io/local-path-provisioner-role created
# rolebinding.rbac.authorization.k8s.io/local-path-provisioner-bind created
# clusterrolebinding.rbac.authorization.k8s.io/local-path-provisioner-bind created
# deployment.apps/local-path-provisioner created
# storageclass.storage.k8s.io/local-path created
# configmap/local-path-config created

kubectl get sc
# NAME         PROVISIONER             RECLAIMPOLICY   VOLUMEBINDINGMODE      ALLOWVOLUMEEXPANSION   AGE
# local-path   rancher.io/local-path   Delete          WaitForFirstConsumer   false                  3m3s


kubectl patch storageclass local-path -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"true"}}}'
# storageclass.storage.k8s.io/local-path patched

kubectl get sc
# NAME                   PROVISIONER             RECLAIMPOLICY   VOLUMEBINDINGMODE      ALLOWVOLUMEEXPANSION   AGE
# local-path (default)   rancher.io/local-path   Delete          WaitForFirstConsumer   false                  20m

kubectl get sc -o yaml
# apiVersion: v1
# items:
# - apiVersion: storage.k8s.io/v1
#   kind: StorageClass
#   metadata:
#     annotations:
#       kubectl.kubernetes.io/last-applied-configuration: |
#         {"apiVersion":"storage.k8s.io/v1","kind":"StorageClass","metadata":{"annotations":{"storageclass.kubernetes.io/is-default-class":"true"},"name":"hostpath"},"provisioner":"docker.io/hostpath","reclaimPolicy":"Delete","volumeBindingMode":"Immediate"}
#       storageclass.kubernetes.io/is-default-class: "true"
#     creationTimestamp: "2025-11-05T18:00:48Z"
#     name: hostpath
#     resourceVersion: "402"
#     uid: 1f503168-2cfb-4064-a51e-66605b6bdd4a
#   provisioner: docker.io/hostpath
#   reclaimPolicy: Delete
#   volumeBindingMode: Immediate
# - apiVersion: storage.k8s.io/v1
#   kind: StorageClass
#   metadata:
#     annotations:
#       kubectl.kubernetes.io/last-applied-configuration: |
#         {"apiVersion":"storage.k8s.io/v1","kind":"StorageClass","metadata":{"annotations":{},"name":"local"},"provisioner":"kubernetes.io/no-provisioner","volumeBindingMode":"WaitForFirstConsumer"}
#     creationTimestamp: "2025-12-25T20:00:45Z"
#     name: local
#     resourceVersion: "2478232"
#     uid: 927380ce-05a7-4e26-84a9-ccaa463f5f23
#   provisioner: kubernetes.io/no-provisioner
#   reclaimPolicy: Delete
#   volumeBindingMode: WaitForFirstConsumer
# kind: List
# metadata:
#   resourceVersion: ""