April 2018
Intermediate to advanced
468 pages
14h 34m
English
Content preview from Mastering Kubernetes - Second Edition
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Access modes
There are three access modes:
- ReadOnlyMany: Can be mounted as read-only by many nodes
- ReadWriteOnce: Can be mounted as read-write by a single node
- ReadWriteMany: Can be mounted as read-write by many nodes
The storage is mounted to nodes, so even with ReadWriteOnce, multiple containers on the same node can mount the volume and write to it. If that causes a problem, you need to handle it though some other mechanism (for example, you could claim the volume only in DaemonSet pods that you know will have just one per node).
Different storage providers support some subset of these modes. When you provision a persistent volume, you can specify which modes it will support. For example, NFS supports all modes, but in the example, only ...
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