Readwriteonce
ReadWriteOnce is a Kubernetes persistent-storage access mode allowing a volume to be mounted for read-write use by a single node.
Kubernetes in Action, Second Edition
ReadWriteOnce is a Kubernetes volume access mode that permits a volume to be attached read-write to one node, while multiple pods on that node may use it.
- How it is used
- Supports shared read-write storage for multiple pods that are placed on one Kubernetes node.
- How deep it goes
- Explains node attachment, pod scheduling effects, and diagnostic events, but does not detail storage-provider implementation.
- Examples
- Demonstrates BusyBox pods writing hostname files, inspecting logs, and failing cross-node attachment.
- What you can do after
- Diagnose scheduling and attachment behavior by comparing pod nodes, statuses, and volume events.
Read how Kubernetes in Action, Second Edition explains readwriteonce →
Kubernetes for Developers
ReadWriteOnce is a persistent-storage access mode that permits a volume to be mounted for read-write use by a single node.
- How it is used
- Uses one Pod’s read-write access to back stateful workloads with traditional block-based persistent storage.
- How deep it goes
- Defines access-mode choices and claim binding, while deferring StorageClass details to separate treatment.
- Examples
- Demonstrates a MariaDB Pod requesting 2 GiB and mounting the claim at /var/lib/mysql.
- What you can do after
- Configure a Kubernetes PersistentVolumeClaim with ReadWriteOnce and verify its bound PersistentVolume using kubectl.
Related concepts
- access modekind of · An access mode is a persistent-storage policy specifying how and by how many nodes or Pods a volume may be mounted for reading and writing.
- persistent volumeconfigures · A persistent volume is durable storage provisioned independently of an individual workload’s lifecycle, allowing data to survive workload replacement or restart.
- persistent volume claimconfigures · A PersistentVolumeClaim is a Kubernetes resource through which a workload requests persistent storage with specified capacity, access modes, and other storage characteristics.
- ReadWriteOncePodcontrasts with · ReadWriteOncePod is a Kubernetes volume access mode allowing a volume to be mounted read-write by only one pod at a time.
- readwritemanycontrasts with · ReadWriteMany is a Kubernetes volume access mode allowing a volume to be mounted concurrently as read-write by multiple nodes or pods.
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