Pv and PVC storage of K8s notes
What are pv and pvc
1. PersistentVolume (PV) is a piece of network storage in the cluster that has been configured by the administrator. A resource in a cluster is like a node is a cluster resource. PV is a volume plug-in such as a volume, but has a life cycle independent of any single pod that uses PV. This API object captures the implementation details of the storage, that is, the NFS,iSCSI or cloud provider-specific storage system.
Types supported by PV
The commonly used types are
GCEPersistentDisk
AWSElasticBlockStore
AzureFile
AzureDisk
FC (Fibre Channel)
FlexVolume
Flocker
NFS
ISCSI
RBD (Ceph Block Device)
CephFS
Cinder (OpenStack block storage)
Glusterfs
VsphereVolume
Quobyte Volumes
HostPath
VMware Photon
Portworx Volumes
ScaleIO Volumes
2. Access mode of pv
ReadWriteOnce: read and write to a single node
ReadOnlyMany: multi-node read-only
ReadWriteMany: multi-node read and write. Only one mode can be used when mounting.
3. The recycling mode of pv
Retain-requires manual recycling by the administrator.
Recycle-clears the data in PV, which is equivalent to performing rm-rf / thevolume/*.
Delete-Delet
Create pv, which has been stored in nfs as an example
1. Install the nfs server
2. Create a storage path
3. Access directory authorization
Mkdir-p / data/test/v1
Echo "/ data/test/v1 * (rw,sync,no_root_squash)" > > / etc/exports
Exportfs-avr
Write yaml files
ApiVersion: v1kind: PersistentVolumemetadata: name: test01-pvspec: capacity: storage: 1Gi accessModes:-ReadWriteMany storageClassName: test01-pv persistentVolumeReclaimPolicy: Recycle nfs: path: / data/test/v1 server: 192.168.222.247
Kubectl create-f test01_pv.yaml
Binding of pvc
ApiVersion: v1kind: PersistentVolumeClaimmetadata: name: test01-pvc namespace: test01spec: storageClassName:-ReadWriteMany resources: requests: storage: 1Gi---apiVersion: v1kind: Podmetadata: name: myapp namespace: test01spec: containers:-name: myapp image: ikubernetes/myapp:v1 volumeMounts:-name: html mountPath: / usr/share/nginx/html volumes:-name: html persistentVolumeClaim: claimName: test01-pvc
Kubectl create-f test01_pod_pvc.yaml
View pvc and pod
Pv in bound state cannot be deleted directly
