Local persistent volumes
Introduced since K8S 1.14
Last updated
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Introduced since K8S 1.14
Last updated
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What is LPV: A local persistent volume represents a local disk directly-attached to a single Kubernetes Node.
Benefits comparing with remote storage: Comparing with remote storage, local persistent volume provides high performance and low latency.
Differences from HostPath volume: HostPath volumes mount a file or directory from the host node’s filesystem into a Pod. Similarly a Local Persistent Volume mounts a local disk or partition into a Pod.
With HostPath volumes, a pod referencing a HostPath volume may be moved by the scheduler to a different node resulting in data loss. But with Local Persistent Volumes, the Kubernetes scheduler ensures that a pod using a Local Persistent Volume is always scheduled to the same node.
While HostPath volumes may be referenced via a Persistent Volume Claim (PVC) or directly inline in a pod definition, Local Persistent Volumes can only be referenced via a PVC.
While HostPath volumes may be referenced via a Persistent Volume Claim (PVC) or directly inline in a pod definition, Local Persistent Volumes can only be referenced via a PVC.
Limitations:
1.14 version does not support dynamic provisioning
Using local storage ties your application to a specific node, making your application harder to schedule. Applications which use local storage should specify a high priority so that lower priority pods, that don’t require local storage, can be preempted if necessary.
If that node or local volume encounters a failure and becomes inaccessible, then that pod also becomes inaccessible. Manual intervention, external controllers, or operators may be needed to recover from these situations.
While most remote storage systems implement synchronous replication, most local disk offerings do not provide data durability guarantees. Meaning loss of the disk or node may result in loss of all the data on that disk
